Man

Command Section
rsyncd.conf(5)                                                  rsyncd.conf(5)

NAME
       rsyncd.conf - configuration file for rsync in daemon mode

SYNOPSIS
       rsyncd.conf

DESCRIPTION
       The rsyncd.conf file is the runtime configuration file for rsync when
       run as an rsync daemon.

       The rsyncd.conf file controls authentication, access, logging and
       available modules.

FILE FORMAT
       The file consists of modules and parameters. A module begins with the
       name of the module in square brackets and continues until the next
       module begins. Modules contain parameters of the form "name = value".

       The file is line-based -- that is, each newline-terminated line
       represents either a comment, a module name or a parameter.

       Only the first equals sign in a parameter is significant. Whitespace
       before or after the first equals sign is discarded. Leading, trailing
       and internal whitespace in module and parameter names is irrelevant.
       Leading and trailing whitespace in a parameter value is discarded.
       Internal whitespace within a parameter value is retained verbatim.

       Any line beginning with a hash (#) is ignored, as are lines containing
       only whitespace. (If a hash occurs after anything other than leading
       whitespace, it is considered a part of the line's content.)

       Any line ending in a \ is "continued" on the next line in the customary
       UNIX fashion.

       The values following the equals sign in parameters are all either a
       string (no quotes needed) or a boolean, which may be given as yes/no,
       0/1 or true/false. Case is not significant in boolean values, but is
       preserved in string values.

LAUNCHING THE RSYNC DAEMON
       The rsync daemon is launched by specifying the --daemon option to
       rsync.

       The daemon must run with root privileges if you wish to use chroot, to
       bind to a port numbered under 1024 (as is the default 873), or to set
       file ownership.  Otherwise, it must just have permission to read and
       write the appropriate data, log, and lock files.

       You can launch it either via inetd, as a stand-alone daemon, or from an
       rsync client via a remote shell.  If run as a stand-alone daemon then
       just run the command "rsync --daemon" from a suitable startup script.

       When run via inetd you should add a line like this to
       /usr/local/etc/rsync/services:

         rsync           873/tcp

       and a single line something like this to
       /usr/local/etc/rsync/inetd.conf:

         rsync   stream  tcp     nowait  root   /usr/bin/rsync rsyncd --daemon

       Replace "/usr/bin/rsync" with the path to where you have rsync
       installed on your system.  You will then need to send inetd a HUP
       signal to tell it to reread its config file.

       Note that you should not send the rsync daemon a HUP signal to force it
       to reread the rsyncd.conf file. The file is re-read on each client
       connection.

GLOBAL PARAMETERS
       The first parameters in the file (before a [module] header) are the
       global parameters.  Rsync also allows for the use of a "[global]"
       module name to indicate the start of one or more global-parameter
       sections (the name must be lower case).

       You may also include any module parameters in the global part of the
       config file in which case the supplied value will override the default
       for that parameter.

       You may use references to environment variables in the values of
       parameters.  String parameters will have %VAR% references expanded as
       late as possible (when the string is used in the program), allowing for
       the use of variables that rsync sets at connection time, such as
       RSYNC_USER_NAME.  Non-string parameters (such as true/false settings)
       are expanded when read from the config file.  If a variable does not
       exist in the environment, or if a sequence of characters is not a valid
       reference (such as an un-paired percent sign), the raw characters are
       passed through unchanged.  This helps with backward compatibility and
       safety (e.g. expanding a non-existent %VAR% to an empty string in a
       path could result in a very unsafe path).  The safest way to insert a
       literal % into a value is to use %%.

       motd file
              This parameter allows you to specify a "message of the day" to
              display to clients on each connect. This usually contains site
              information and any legal notices. The default is no motd file.
              This can be overridden by the --dparam=motdfile=FILE
              command-line option when starting the daemon.

       pid file
              This parameter tells the rsync daemon to write its process ID to
              that file.  If the file already exists, the rsync daemon will
              abort rather than overwrite the file.  This can be overridden by
              the --dparam=pidfile=FILE command-line option when starting the
              daemon.

       port   You can override the default port the daemon will listen on by
              specifying this value (defaults to 873).  This is ignored if the
              daemon is being run by inetd, and is superseded by the --port
              command-line option.

       address
              You can override the default IP address the daemon will listen
              on by specifying this value.  This is ignored if the daemon is
              being run by inetd, and is superseded by the --address
              command-line option.

       socket options
              This parameter can provide endless fun for people who like to
              tune their systems to the utmost degree. You can set all sorts
              of socket options which may make transfers faster (or slower!).
              Read the man page for the setsockopt() system call for details
              on some of the options you may be able to set. By default no
              special socket options are set.  These settings can also be
              specified via the --sockopts command-line option.

       listen backlog
              You can override the default backlog value when the daemon
              listens for connections.  It defaults to 5.

MODULE PARAMETERS
       After the global parameters you should define a number of modules, each
       module exports a directory tree as a symbolic name. Modules are
       exported by specifying a module name in square brackets [module]
       followed by the parameters for that module.  The module name cannot
       contain a slash or a closing square bracket.  If the name contains
       whitespace, each internal sequence of whitespace will be changed into a
       single space, while leading or trailing whitespace will be discarded.
       Also, the name cannot be "global" as that exact name indicates that
       global parameters follow (see above).

       As with GLOBAL PARAMETERS, you may use references to environment
       variables in the values of parameters.  See the GLOBAL PARAMETERS
       section for more details.

       comment
              This parameter specifies a description string that is displayed
              next to the module name when clients obtain a list of available
              modules. The default is no comment.

       path   This parameter specifies the directory in the daemon's
              filesystem to make available in this module.  You must specify
              this parameter for each module in rsyncd.conf.

              You may base the path's value off of an environment variable by
              surrounding the variable name with percent signs.  You can even
              reference a variable that is set by rsync when the user
              connects.  For example, this would use the authorizing user's
              name in the path:

                  path = /home/%RSYNC_USER_NAME%

              It is fine if the path includes internal spaces -- they will be
              retained verbatim (which means that you shouldn't try to escape
              them).  If your final directory has a trailing space (and this
              is somehow not something you wish to fix), append a trailing
              slash to the path to avoid losing the trailing whitespace.

       use chroot
              If "use chroot" is true, the rsync daemon will chroot to the
              "path" before starting the file transfer with the client.  This
              has the advantage of extra protection against possible
              implementation security holes, but it has the disadvantages of
              requiring super-user privileges, of not being able to follow
              symbolic links that are either absolute or outside of the new
              root path, and of complicating the preservation of users and
              groups by name (see below).

              As an additional safety feature, you can specify a dot-dir in
              the module's "path" to indicate the point where the chroot
              should occur.  This allows rsync to run in a chroot with a
              non-"/" path for the top of the transfer hierarchy.  Doing this
              guards against unintended library loading (since those absolute
              paths will not be inside the transfer hierarchy unless you have
              used an unwise pathname), and lets you setup libraries for the
              chroot that are outside of the transfer.  For example,
              specifying "/var/rsync/./module1" will chroot to the
              "/var/rsync" directory and set the inside-chroot path to
              "/module1".  If you had omitted the dot-dir, the chroot would
              have used the whole path, and the inside-chroot path would have
              been "/".

              When "use chroot" is false or the inside-chroot path is not "/",
              rsync will: (1) munge symlinks by default for security reasons
              (see "munge symlinks" for a way to turn this off, but only if
              you trust your users), (2) substitute leading slashes in
              absolute paths with the module's path (so that options such as
              --backup-dir, --compare-dest, etc. interpret an absolute path as
              rooted in the module's "path" dir), and (3) trim ".." path
              elements from args if rsync believes they would escape the
              module hierarchy.  The default for "use chroot" is true, and is
              the safer choice (especially if the module is not read-only).

              When this parameter is enabled, the "numeric-ids" option will
              also default to being enabled (disabling name lookups).  See
              below for what a chroot needs in order for name lookups to
              succeed.

              If you copy library resources into the module's chroot area, you
              should protect them through your OS's normal user/group or ACL
              settings (to prevent the rsync module's user from being able to
              change them), and then hide them from the user's view via
              "exclude" (see how in the discussion of that parameter).  At
              that point it will be safe to enable the mapping of users and
              groups by name using this "numeric ids" daemon parameter.

              Note also that you are free to setup custom user/group
              information in the chroot area that is different from your
              normal system.  For example, you could abbreviate the list of
              users and groups.

       numeric ids
              Enabling this parameter disables the mapping of users and groups
              by name for the current daemon module.  This prevents the daemon
              from trying to load any user/group-related files or libraries.
              This enabling makes the transfer behave as if the client had
              passed the --numeric-ids command-line option.  By default, this
              parameter is enabled for chroot modules and disabled for
              non-chroot modules.  Also keep in mind that uid/gid preservation
              requires the module to be running as root (see "uid") or for
              "fake super" to be configured.

              A chroot-enabled module should not have this parameter enabled
              unless you've taken steps to ensure that the module has the
              necessary resources it needs to translate names, and that it is
              not possible for a user to change those resources.  That
              includes being the code being able to call functions like
              getpwuid() , getgrgid() , getpwname() , and getgrnam() ).  You
              should test what libraries and config files are required for
              your OS and get those setup before starting to test name mapping
              in rsync.

       munge symlinks
              This parameter tells rsync to modify all symlinks in the same
              way as the (non-daemon-affecting) --munge-links command-line
              option (using a method described below).  This should help
              protect your files from user trickery when your daemon module is
              writable.  The default is disabled when "use chroot" is on and
              the inside-chroot path is "/", otherwise it is enabled.

              If you disable this parameter on a daemon that is not read-only,
              there are tricks that a user can play with uploaded symlinks to
              access daemon-excluded items (if your module has any), and, if
              "use chroot" is off, rsync can even be tricked into showing or
              changing data that is outside the module's path (as
              access-permissions allow).

              The way rsync disables the use of symlinks is to prefix each one
              with the string "/rsyncd-munged/".  This prevents the links from
              being used as long as that directory does not exist.  When this
              parameter is enabled, rsync will refuse to run if that path is a
              directory or a symlink to a directory.  When using the "munge
              symlinks" parameter in a chroot area that has an inside-chroot
              path of "/", you should add "/rsyncd-munged/" to the exclude
              setting for the module so that a user can't try to create it.

              Note:  rsync makes no attempt to verify that any pre-existing
              symlinks in the module's hierarchy are as safe as you want them
              to be (unless, of course, it just copied in the whole
              hierarchy).  If you setup an rsync daemon on a new area or
              locally add symlinks, you can manually protect your symlinks
              from being abused by prefixing "/rsyncd-munged/" to the start of
              every symlink's value.  There is a perl script in the support
              directory of the source code named "munge-symlinks" that can be
              used to add or remove this prefix from your symlinks.

              When this parameter is disabled on a writable module and "use
              chroot" is off (or the inside-chroot path is not "/"), incoming
              symlinks will be modified to drop a leading slash and to remove
              ".." path elements that rsync believes will allow a symlink to
              escape the module's hierarchy.  There are tricky ways to work
              around this, though, so you had better trust your users if you
              choose this combination of parameters.

       charset
              This specifies the name of the character set in which the
              module's filenames are stored.  If the client uses an --iconv
              option, the daemon will use the value of the "charset" parameter
              regardless of the character set the client actually passed.
              This allows the daemon to support charset conversion in a chroot
              module without extra files in the chroot area, and also ensures
              that name-translation is done in a consistent manner.  If the
              "charset" parameter is not set, the --iconv option is refused,
              just as if "iconv" had been specified via "refuse options".

              If you wish to force users to always use --iconv for a
              particular module, add "no-iconv" to the "refuse options"
              parameter.  Keep in mind that this will restrict access to your
              module to very new rsync clients.

       max connections
              This parameter allows you to specify the maximum number of
              simultaneous connections you will allow.  Any clients connecting
              when the maximum has been reached will receive a message telling
              them to try later.  The default is 0, which means no limit.  A
              negative value disables the module.  See also the "lock file"
              parameter.

       log file
              When the "log file" parameter is set to a non-empty string, the
              rsync daemon will log messages to the indicated file rather than
              using syslog. This is particularly useful on systems (such as
              AIX) where syslog() doesn't work for chrooted programs.  The
              file is opened before chroot() is called, allowing it to be
              placed outside the transfer.  If this value is set on a
              per-module basis instead of globally, the global log will still
              contain any authorization failures or config-file error
              messages.

              If the daemon fails to open the specified file, it will fall
              back to using syslog and output an error about the failure.
              (Note that the failure to open the specified log file used to be
              a fatal error.)

              This setting can be overridden by using the --log-file=FILE or
              --dparam=logfile=FILE command-line options.  The former
              overrides all the log-file parameters of the daemon and all
              module settings.  The latter sets the daemon's log file and the
              default for all the modules, which still allows modules to
              override the default setting.

       syslog facility
              This parameter allows you to specify the syslog facility name to
              use when logging messages from the rsync daemon. You may use any
              standard syslog facility name which is defined on your system.
              Common names are auth, authpriv, cron, daemon, ftp, kern, lpr,
              mail, news, security, syslog, user, uucp, local0, local1,
              local2, local3, local4, local5, local6 and local7. The default
              is daemon.  This setting has no effect if the "log file" setting
              is a non-empty string (either set in the per-modules settings,
              or inherited from the global settings).

       max verbosity
              This parameter allows you to control the maximum amount of
              verbose information that you'll allow the daemon to generate
              (since the information goes into the log file). The default is
              1, which allows the client to request one level of verbosity.

              This also affects the user's ability to request higher levels of
              --info and --debug logging.  If the max value is 2, then no info
              and/or debug value that is higher than what would be set by -vv
              will be honored by the daemon in its logging.  To see how high
              of a verbosity level you need to accept for a particular
              info/debug level, refer to "rsync --info=help" and "rsync
              --debug=help".  For instance, it takes max-verbosity 4 to be
              able to output debug TIME2 and FLIST3.

       lock file
              This parameter specifies the file to use to support the "max
              connections" parameter. The rsync daemon uses record locking on
              this file to ensure that the max connections limit is not
              exceeded for the modules sharing the lock file.  The default is
              /var/run/rsyncd.lock.

       read only
              This parameter determines whether clients will be able to upload
              files or not. If "read only" is true then any attempted uploads
              will fail. If "read only" is false then uploads will be possible
              if file permissions on the daemon side allow them. The default
              is for all modules to be read only.

              Note that "auth users" can override this setting on a per-user
              basis.

       write only
              This parameter determines whether clients will be able to
              download files or not. If "write only" is true then any
              attempted downloads will fail. If "write only" is false then
              downloads will be possible if file permissions on the daemon
              side allow them.  The default is for this parameter to be
              disabled.

       list   This parameter determines whether this module is listed when the
              client asks for a listing of available modules.  In addition, if
              this is false, the daemon will pretend the module does not exist
              when a client denied by "hosts allow" or "hosts deny" attempts
              to access it.  Realize that if "reverse lookup" is disabled
              globally but enabled for the module, the resulting reverse
              lookup to a potentially client-controlled DNS server may still
              reveal to the client that it hit an existing module.  The
              default is for modules to be listable.

       uid    This parameter specifies the user name or user ID that file
              transfers to and from that module should take place as when the
              daemon was run as root. In combination with the "gid" parameter
              this determines what file permissions are available. The default
              when run by a super-user is to switch to the system's "nobody"
              user.  The default for a non-super-user is to not try to change
              the user.  See also the "gid" parameter.

              The RSYNC_USER_NAME environment variable may be used to request
              that rsync run as the authorizing user.  For example, if you
              want a rsync to run as the same user that was received for the
              rsync authentication, this setup is useful:

                  uid = %RSYNC_USER_NAME%
                  gid = *

       gid    This parameter specifies one or more group names/IDs that will
              be used when accessing the module.  The first one will be the
              default group, and any extra ones be set as supplemental groups.
              You may also specify a "*" as the first gid in the list, which
              will be replaced by all the normal groups for the transfer's
              user (see "uid").  The default when run by a super-user is to
              switch to your OS's "nobody" (or perhaps "nogroup") group with
              no other supplementary groups.  The default for a non-super-user
              is to not change any group attributes (and indeed, your OS may
              not allow a non-super-user to try to change their group
              settings).

       fake super
              Setting "fake super = yes" for a module causes the daemon side
              to behave as if the --fake-super command-line option had been
              specified.  This allows the full attributes of a file to be
              stored without having to have the daemon actually running as
              root.

       filter The daemon has its own filter chain that determines what files
              it will let the client access.  This chain is not sent to the
              client and is independent of any filters the client may have
              specified.  Files excluded by the daemon filter chain
              (daemon-excluded files) are treated as non-existent if the
              client tries to pull them, are skipped with an error message if
              the client tries to push them (triggering exit code 23), and are
              never deleted from the module.  You can use daemon filters to
              prevent clients from downloading or tampering with private
              administrative files, such as files you may add to support
              uid/gid name translations.

              The daemon filter chain is built from the "filter", "include
              from", "include", "exclude from", and "exclude" parameters, in
              that order of priority.  Anchored patterns are anchored at the
              root of the module.  To prevent access to an entire subtree, for
              example, "/secret", you must exclude everything in the subtree;
              the easiest way to do this is with a triple-star pattern like
              "/secret/***".

              The "filter" parameter takes a space-separated list of daemon
              filter rules, though it is smart enough to know not to split a
              token at an internal space in a rule (e.g. "- /foo  - /bar" is
              parsed as two rules).  You may specify one or more merge-file
              rules using the normal syntax.  Only one "filter" parameter can
              apply to a given module in the config file, so put all the rules
              you want in a single parameter.  Note that per-directory
              merge-file rules do not provide as much protection as global
              rules, but they can be used to make --delete work better during
              a client download operation if the per-dir merge files are
              included in the transfer and the client requests that they be
              used.

       exclude
              This parameter takes a space-separated list of daemon exclude
              patterns.  As with the client --exclude option, patterns can be
              qualified with "- " or "+ " to explicitly indicate
              exclude/include.  Only one "exclude" parameter can apply to a
              given module.  See the "filter" parameter for a description of
              how excluded files affect the daemon.

       include
              Use an "include" to override the effects of the "exclude"
              parameter.  Only one "include" parameter can apply to a given
              module.  See the "filter" parameter for a description of how
              excluded files affect the daemon.

       exclude from
              This parameter specifies the name of a file on the daemon that
              contains daemon exclude patterns, one per line.  Only one
              "exclude from" parameter can apply to a given module; if you
              have multiple exclude-from files, you can specify them as a
              merge file in the "filter" parameter.  See the "filter"
              parameter for a description of how excluded files affect the
              daemon.

       include from
              Analogue of "exclude from" for a file of daemon include
              patterns.  Only one "include from" parameter can apply to a
              given module.  See the "filter" parameter for a description of
              how excluded files affect the daemon.

       incoming chmod
              This parameter allows you to specify a set of comma-separated
              chmod strings that will affect the permissions of all incoming
              files (files that are being received by the daemon).  These
              changes happen after all other permission calculations, and this
              will even override destination-default and/or existing
              permissions when the client does not specify --perms.  See the
              description of the --chmod rsync option and the chmod(1) manpage
              for information on the format of this string.

       outgoing chmod
              This parameter allows you to specify a set of comma-separated
              chmod strings that will affect the permissions of all outgoing
              files (files that are being sent out from the daemon).  These
              changes happen first, making the sent permissions appear to be
              different than those stored in the filesystem itself.  For
              instance, you could disable group write permissions on the
              server while having it appear to be on to the clients.  See the
              description of the --chmod rsync option and the chmod(1) manpage
              for information on the format of this string.

       auth users
              This parameter specifies a comma and/or space-separated list of
              authorization rules.  In its simplest form, you list the
              usernames that will be allowed to connect to this module. The
              usernames do not need to exist on the local system. The rules
              may contain shell wildcard characters that will be matched
              against the username provided by the client for authentication.
              If "auth users" is set then the client will be challenged to
              supply a username and password to connect to the module. A
              challenge response authentication protocol is used for this
              exchange. The plain text usernames and passwords are stored in
              the file specified by the "secrets file" parameter. The default
              is for all users to be able to connect without a password (this
              is called "anonymous rsync").

              In addition to username matching, you can specify groupname
              matching via a '@' prefix.  When using groupname matching, the
              authenticating username must be a real user on the system, or it
              will be assumed to be a member of no groups.  For example,
              specifying "@rsync" will match the authenticating user if the
              named user is a member of the rsync group.

              Finally, options may be specified after a colon (:).  The
              options allow you to "deny" a user or a group, set the access to
              "ro" (read-only), or set the access to "rw" (read/write).
              Setting an auth-rule-specific ro/rw setting overrides the
              module's "read only" setting.

              Be sure to put the rules in the order you want them to be
              matched, because the checking stops at the first matching user
              or group, and that is the only auth that is checked.  For
              example:

                auth users = joe:deny @guest:deny admin:rw @rsync:ro susan joe sam

              In the above rule, user joe will be denied access no matter
              what.  Any user that is in the group "guest" is also denied
              access.  The user "admin" gets access in read/write mode, but
              only if the admin user is not in group "guest" (because the
              admin user-matching rule would never be reached if the user is
              in group "guest").  Any other user who is in group "rsync" will
              get read-only access.  Finally, users susan, joe, and sam get
              the ro/rw setting of the module, but only if the user didn't
              match an earlier group-matching rule.

              See the description of the secrets file for how you can have
              per-user passwords as well as per-group passwords.  It also
              explains how a user can authenticate using their user password
              or (when applicable) a group password, depending on what rule is
              being authenticated.

              See also the section entitled "USING RSYNC-DAEMON FEATURES VIA A
              REMOTE SHELL CONNECTION" in rsync(1) for information on how
              handle an rsyncd.conf-level username that differs from the
              remote-shell-level username when using a remote shell to connect
              to an rsync daemon.

       secrets file
              This parameter specifies the name of a file that contains the
              username:password and/or @groupname:password pairs used for
              authenticating this module. This file is only consulted if the
              "auth users" parameter is specified.  The file is line-based and
              contains one name:password pair per line.  Any line has a hash
              (#) as the very first character on the line is considered a
              comment and is skipped.  The passwords can contain any
              characters but be warned that many operating systems limit the
              length of passwords that can be typed at the client end, so you
              may find that passwords longer than 8 characters don't work.

              The use of group-specific lines are only relevant when the
              module is being authorized using a matching "@groupname" rule.
              When that happens, the user can be authorized via either their
              "username:password" line or the "@groupname:password" line for
              the group that triggered the authentication.

              It is up to you what kind of password entries you want to
              include, either users, groups, or both.  The use of group rules
              in "auth users" does not require that you specify a group
              password if you do not want to use shared passwords.

              There is no default for the "secrets file" parameter, you must
              choose a name (such as /usr/local/etc/rsync/rsyncd.secrets).
              The file must normally not be readable by "other"; see "strict
              modes".  If the file is not found or is rejected, no logins for
              a "user auth" module will be possible.

       strict modes
              This parameter determines whether or not the permissions on the
              secrets file will be checked.  If "strict modes" is true, then
              the secrets file must not be readable by any user ID other than
              the one that the rsync daemon is running under.  If "strict
              modes" is false, the check is not performed.  The default is
              true.  This parameter was added to accommodate rsync running on
              the Windows operating system.

       hosts allow
              This parameter allows you to specify a list of patterns that are
              matched against a connecting clients hostname and IP address. If
              none of the patterns match then the connection is rejected.

              Each pattern can be in one of five forms:

              o      a dotted decimal IPv4 address of the form a.b.c.d, or an
                     IPv6 address of the form a:b:c::d:e:f. In this case the
                     incoming machine's IP address must match exactly.

              o      an address/mask in the form ipaddr/n where ipaddr is the
                     IP address and n is the number of one bits in the
                     netmask.  All IP addresses which match the masked IP
                     address will be allowed in.

              o      an address/mask in the form ipaddr/maskaddr where ipaddr
                     is the IP address and maskaddr is the netmask in dotted
                     decimal notation for IPv4, or similar for IPv6, e.g.
                     ffff:ffff:ffff:ffff:: instead of /64. All IP addresses
                     which match the masked IP address will be allowed in.

              o      a hostname pattern using wildcards. If the hostname of
                     the connecting IP (as determined by a reverse lookup)
                     matches the wildcarded name (using the same rules as
                     normal unix filename matching), the client is allowed in.
                     This only works if "reverse lookup" is enabled (the
                     default).

              o      a hostname. A plain hostname is matched against the
                     reverse DNS of the connecting IP (if "reverse lookup" is
                     enabled), and/or the IP of the given hostname is matched
                     against the connecting IP (if "forward lookup" is
                     enabled, as it is by default).  Any match will be allowed
                     in.

              Note IPv6 link-local addresses can have a scope in the address
              specification:
                  fe80::1%link1
                  fe80::%link1/64
                  fe80::%link1/ffff:ffff:ffff:ffff::

              You can also combine "hosts allow" with a separate "hosts deny"
              parameter. If both parameters are specified then the "hosts
              allow" parameter is checked first and a match results in the
              client being able to connect. The "hosts deny" parameter is then
              checked and a match means that the host is rejected. If the host
              does not match either the "hosts allow" or the "hosts deny"
              patterns then it is allowed to connect.

              The default is no "hosts allow" parameter, which means all hosts
              can connect.

       hosts deny
              This parameter allows you to specify a list of patterns that are
              matched against a connecting clients hostname and IP address. If
              the pattern matches then the connection is rejected. See the
              "hosts allow" parameter for more information.

              The default is no "hosts deny" parameter, which means all hosts
              can connect.

       reverse lookup
              Controls whether the daemon performs a reverse lookup on the
              client's IP address to determine its hostname, which is used for
              "hosts allow"/"hosts deny" checks and the "%h" log escape.  This
              is enabled by default, but you may wish to disable it to save
              time if you know the lookup will not return a useful result, in
              which case the daemon will use the name "UNDETERMINED" instead.

              If this parameter is enabled globally (even by default), rsync
              performs the lookup as soon as a client connects, so disabling
              it for a module will not avoid the lookup.  Thus, you probably
              want to disable it globally and then enable it for modules that
              need the information.

       forward lookup
              Controls whether the daemon performs a forward lookup on any
              hostname specified in an hosts allow/deny setting.  By default
              this is enabled, allowing the use of an explicit hostname that
              would not be returned by reverse DNS of the connecting IP.

       ignore errors
              This parameter tells rsyncd to ignore I/O errors on the daemon
              when deciding whether to run the delete phase of the transfer.
              Normally rsync skips the --delete step if any I/O errors have
              occurred in order to prevent disastrous deletion due to a
              temporary resource shortage or other I/O error. In some cases
              this test is counter productive so you can use this parameter to
              turn off this behavior.

       ignore nonreadable
              This tells the rsync daemon to completely ignore files that are
              not readable by the user. This is useful for public archives
              that may have some non-readable files among the directories, and
              the sysadmin doesn't want those files to be seen at all.

       transfer logging
              This parameter enables per-file logging of downloads and uploads
              in a format somewhat similar to that used by ftp daemons.  The
              daemon always logs the transfer at the end, so if a transfer is
              aborted, no mention will be made in the log file.

              If you want to customize the log lines, see the "log format"
              parameter.

       log format
              This parameter allows you to specify the format used for logging
              file transfers when transfer logging is enabled.  The format is
              a text string containing embedded single-character escape
              sequences prefixed with a percent (%) character.  An optional
              numeric field width may also be specified between the percent
              and the escape letter (e.g. "%-50n %8l %07p").  In addition, one
              or more apostrophes may be specified prior to a numerical escape
              to indicate that the numerical value should be made more
              human-readable.  The 3 supported levels are the same as for the
              --human-readable command-line option, though the default is for
              human-readability to be off.  Each added apostrophe increases
              the level (e.g. "%''l %'b %f").

              The default log format is "%o %h [%a] %m (%u) %f %l", and a "%t
              [%p] " is always prefixed when using the "log file" parameter.
              (A perl script that will summarize this default log format is
              included in the rsync source code distribution in the "support"
              subdirectory: rsyncstats.)

              The single-character escapes that are understood are as follows:

              o      %a the remote IP address (only available for a daemon)

              o      %b the number of bytes actually transferred

              o      %B the permission bits of the file (e.g. rwxrwxrwt)

              o      %c the total size of the block checksums received for the
                     basis file (only when sending)

              o      %C the full-file MD5 checksum if --checksum is enabled or
                     a file was transferred (only for protocol 30 or above).

              o      %f the filename (long form on sender; no trailing "/")

              o      %G the gid of the file (decimal) or "DEFAULT"

              o      %h the remote host name (only available for a daemon)

              o      %i an itemized list of what is being updated

              o      %l the length of the file in bytes

              o      %L the string " -> SYMLINK", " => HARDLINK", or "" (where
                     SYMLINK or HARDLINK is a filename)

              o      %m the module name

              o      %M the last-modified time of the file

              o      %n the filename (short form; trailing "/" on dir)

              o      %o the operation, which is "send", "recv", or "del." (the
                     latter includes the trailing period)

              o      %p the process ID of this rsync session

              o      %P the module path

              o      %t the current date time

              o      %u the authenticated username or an empty string

              o      %U the uid of the file (decimal)

              For a list of what the characters mean that are output by "%i",
              see the --itemize-changes option in the rsync manpage.

              Note that some of the logged output changes when talking with
              older rsync versions.  For instance, deleted files were only
              output as verbose messages prior to rsync 2.6.4.

       timeout
              This parameter allows you to override the clients choice for I/O
              timeout for this module. Using this parameter you can ensure
              that rsync won't wait on a dead client forever. The timeout is
              specified in seconds. A value of zero means no timeout and is
              the default. A good choice for anonymous rsync daemons may be
              600 (giving a 10 minute timeout).

       refuse options
              This parameter allows you to specify a space-separated list of
              rsync command line options that will be refused by your rsync
              daemon.  You may specify the full option name, its one-letter
              abbreviation, or a wild-card string that matches multiple
              options.  For example, this would refuse --checksum (-c) and all
              the various delete options:
                  refuse options = c delete

              The reason the above refuses all delete options is that the
              options imply --delete, and implied options are refused just
              like explicit options.  As an additional safety feature, the
              refusal of "delete" also refuses remove-source-files when the
              daemon is the sender; if you want the latter without the former,
              instead refuse "delete-*" -- that refuses all the delete modes
              without affecting --remove-source-files.

              When an option is refused, the daemon prints an error message
              and exits.  To prevent all compression when serving files, you
              can use "dont compress = *" (see below) instead of "refuse
              options = compress" to avoid returning an error to a client that
              requests compression.

       dont compress
              This parameter allows you to select filenames based on wildcard
              patterns that should not be compressed when pulling files from
              the daemon (no analogous parameter exists to govern the pushing
              of files to a daemon).  Compression is expensive in terms of CPU
              usage, so it is usually good to not try to compress files that
              won't compress well, such as already compressed files.

              The "dont compress" parameter takes a space-separated list of
              case-insensitive wildcard patterns. Any source filename matching
              one of the patterns will not be compressed during transfer.

              See the --skip-compress parameter in the rsync(1) manpage for
              the list of file suffixes that are not compressed by default.
              Specifying a value for the "dont compress" parameter changes the
              default when the daemon is the sender.

       pre-xfer exec, post-xfer exec
              You may specify a command to be run before and/or after the
              transfer.  If the pre-xfer exec command fails, the transfer is
              aborted before it begins.  Any output from the script on stdout
              (up to several KB) will be displayed to the user when aborting,
              but is NOT displayed if the script returns success.  Any output
              from the script on stderr goes to the daemon's stderr, which is
              typically discarded (though see --no-detatch option for a way to
              see the stderr output, which can assist with debugging).

              The following environment variables will be set, though some are
              specific to the pre-xfer or the post-xfer environment:

              o      RSYNC_MODULE_NAME: The name of the module being accessed.

              o      RSYNC_MODULE_PATH: The path configured for the module.

              o      RSYNC_HOST_ADDR: The accessing host's IP address.

              o      RSYNC_HOST_NAME: The accessing host's name.

              o      RSYNC_USER_NAME: The accessing user's name (empty if no
                     user).

              o      RSYNC_PID: A unique number for this transfer.

              o      RSYNC_REQUEST: (pre-xfer only) The module/path info
                     specified by the user.  Note that the user can specify
                     multiple source files, so the request can be something
                     like "mod/path1 mod/path2", etc.

              o      RSYNC_ARG#: (pre-xfer only) The pre-request arguments are
                     set in these numbered values. RSYNC_ARG0 is always
                     "rsyncd", followed by the options that were used in
                     RSYNC_ARG1, and so on.  There will be a value of "."
                     indicating that the options are done and the path args
                     are beginning -- these contain similar information to
                     RSYNC_REQUEST, but with values separated and the module
                     name stripped off.

              o      RSYNC_EXIT_STATUS: (post-xfer only) the server side's
                     exit value.  This will be 0 for a successful run, a
                     positive value for an error that the server generated, or
                     a -1 if rsync failed to exit properly.  Note that an
                     error that occurs on the client side does not currently
                     get sent to the server side, so this is not the final
                     exit status for the whole transfer.

              o      RSYNC_RAW_STATUS: (post-xfer only) the raw exit value
                     from waitpid() .

              Even though the commands can be associated with a particular
              module, they are run using the permissions of the user that
              started the daemon (not the module's uid/gid setting) without
              any chroot restrictions.

CONFIG DIRECTIVES
       There are currently two config directives available that allow a config
       file to incorporate the contents of other files:  &include and &merge.
       Both allow a reference to either a file or a directory.  They differ in
       how segregated the file's contents are considered to be.

       The &include directive treats each file as more distinct, with each one
       inheriting the defaults of the parent file, starting the parameter
       parsing as globals/defaults, and leaving the defaults unchanged for the
       parsing of the rest of the parent file.

       The &merge directive, on the other hand, treats the file's contents as
       if it were simply inserted in place of the directive, and thus it can
       set parameters in a module started in another file, can affect the
       defaults for other files, etc.

       When an &include or &merge directive refers to a directory, it will
       read in all the *.conf or *.inc files (respectively) that are contained
       inside that directory (without any recursive scanning), with the files
       sorted into alpha order.  So, if you have a directory named "rsyncd.d"
       with the files "foo.conf", "bar.conf", and "baz.conf" inside it, this
       directive:

           &include /path/rsyncd.d

       would be the same as this set of directives:

           &include /path/rsyncd.d/bar.conf
           &include /path/rsyncd.d/baz.conf
           &include /path/rsyncd.d/foo.conf

       except that it adjusts as files are added and removed from the
       directory.

       The advantage of the &include directive is that you can define one or
       more modules in a separate file without worrying about unintended
       side-effects between the self-contained module files.

       The advantage of the &merge directive is that you can load config
       snippets that can be included into multiple module definitions, and you
       can also set global values that will affect connections (such as motd
       file), or globals that will affect other include files.

       For example, this is a useful /usr/local/etc/rsync/rsyncd.conf file:

           port = 873
           log file = /var/log/rsync.log
           pid file = /var/lock/rsync.lock

           &merge /usr/local/etc/rsync/rsyncd.d
           &include /usr/local/etc/rsync/rsyncd.d

       This would merge any /usr/local/etc/rsync/rsyncd.d/*.inc files (for
       global values that should stay in effect), and then include any
       /usr/local/etc/rsync/rsyncd.d/*.conf files (defining modules without
       any global-value cross-talk).

AUTHENTICATION STRENGTH
       The authentication protocol used in rsync is a 128 bit MD4 based
       challenge response system. This is fairly weak protection, though (with
       at least one brute-force hash-finding algorithm publicly available), so
       if you want really top-quality security, then I recommend that you run
       rsync over ssh.  (Yes, a future version of rsync will switch over to a
       stronger hashing method.)

       Also note that the rsync daemon protocol does not currently provide any
       encryption of the data that is transferred over the connection. Only
       authentication is provided. Use ssh as the transport if you want
       encryption.

       Future versions of rsync may support SSL for better authentication and
       encryption, but that is still being investigated.

EXAMPLES
       A simple rsyncd.conf file that allow anonymous rsync to a ftp area at
       /home/ftp would be:

       [ftp]
               path = /home/ftp
               comment = ftp export area

       A more sophisticated example would be:

       uid = nobody
       gid = nobody
       use chroot = yes
       max connections = 4
       syslog facility = local5
       pid file = /var/run/rsyncd.pid

       [ftp]
               path = /var/ftp/./pub
               comment = whole ftp area (approx 6.1 GB)

       [sambaftp]
               path = /var/ftp/./pub/samba
               comment = Samba ftp area (approx 300 MB)

       [rsyncftp]
               path = /var/ftp/./pub/rsync
               comment = rsync ftp area (approx 6 MB)

       [sambawww]
               path = /public_html/samba
               comment = Samba WWW pages (approx 240 MB)

       [cvs]
               path = /data/cvs
               comment = CVS repository (requires authentication)
               auth users = tridge, susan
               secrets file = /usr/local/etc/rsync/rsyncd.secrets

       The /usr/local/etc/rsync/rsyncd.secrets file would look something like
       this:

              tridge:mypass
              susan:herpass

FILES
       /usr/local/etc/rsync/rsyncd.conf or rsyncd.conf

SEE ALSO
       rsync(1)

DIAGNOSTICS
BUGS
       Please report bugs! The rsync bug tracking system is online at
       http://rsync.samba.org/

VERSION
       This man page is current for version 3.1.2 of rsync.

CREDITS
       rsync is distributed under the GNU General Public License.  See the
       file COPYING for details.

       The primary ftp site for rsync is ftp://rsync.samba.org/pub/rsync.

       A WEB site is available at http://rsync.samba.org/

       We would be delighted to hear from you if you like this program.

       This program uses the zlib compression library written by Jean-loup
       Gailly and Mark Adler.

THANKS
       Thanks to Warren Stanley for his original idea and patch for the rsync
       daemon. Thanks to Karsten Thygesen for his many suggestions and
       documentation!

AUTHOR
       rsync was written by Andrew Tridgell and Paul Mackerras.  Many people
       have later contributed to it.

       Mailing lists for support and development are available at
       http://lists.samba.org

                                  21 Dec 2015                   rsyncd.conf(5)
Command Section