rsyncd.conf(5) - phpMan

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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 dae-
       mon.

       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  com-
       ment, 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.

       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 signif-
       icant 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 num-
       bered  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 /etc/services:

         rsync           873/tcp


       and a single line something like this to /etc/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.

       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.


       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.


       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.


       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 are superseded by the --sockopts command-line option.


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 can-
       not  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.


       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.


       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, --com-
              pare-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, rsync will not attempt to map users and groups by
              name (by default), but instead copy IDs as though --numeric-ids had been specified.
              In order to enable name-mapping, rsync needs to be able to use the standard library
              functions for looking up names and IDs (i.e.  getpwuid() , getgrgid() , getpwname()
              , and getgrnam() ).  This means the rsync process in the chroot hierarchy will need
              to have access to the resources used  by  these  library  functions  (traditionally
              /etc/passwd and /etc/group, but perhaps additional dynamic libraries as well).

              If  you copy the necessary resources into the module's chroot area, you should pro-
              tect 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 the "numeric
              ids" daemon parameter (see below).

              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.

              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.


       munge symlinks
              This parameter tells rsync to modify all incoming symlinks in a way that makes them
              unusable  but  recoverable  (see  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  direc-
              tory  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  sym-
              links" 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 hier-
              archy are as safe as you want them to be.  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  mes-
              sages.

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


       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.


       lock file
              This  parameter  specifies the file to use to support the "max connections" parame-
              ter. The rsync daemon uses record locking on this file to ensure that the max  con-
              nections  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.


       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 if this module should be listed when the client asks  for
              a listing of available modules. By setting this to false you can create hidden mod-
              ules. 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 is uid -2, which is normally the user "nobody".


       gid    This parameter specifies the group name or group ID that file transfers to and from
              that module should take place as when the daemon was run as root. This  complements
              the "uid" parameter. The default is gid -2, which is normally the group "nobody".


       fake super
              Setting  "fake super = yes" for a module causes the daemon side to behave as if the
              --fake-user  command-line  option  had  been  specified.   This  allows  the   full
              attributes  of  a file to be stored without having to have the daemon actually run-
              ning 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 fil-
              ters 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  (trigger-
              ing  exit code 23), and are never deleted from the module.  You can use daemon fil-
              ters 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 pat-
              terns  are anchored at the root of the module.  To prevent access to an entire sub-
              tree, for example, "/secret", you must exclude everything in the subtree; the easi-
              est 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 param-
              eter.  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 explic-
              itly  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 space-separated list of usernames that will be
              allowed  to connect to this module. The usernames do not need to exist on the local
              system. The usernames may also contain shell wildcard characters. If  "auth  users"
              is set then the client will be challenged to supply a username and password to con-
              nect 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").

              See also the "CONNECTING TO AN RSYNC DAEMON OVER A REMOTE SHELL PROGRAM" section 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
              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  username:pass-
              word  pairs  separated by a single colon. Any line starting with a hash (#) is con-
              sidered 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.

              There  is no default for the "secrets file" parameter, you must choose a name (such
              as /etc/rsyncd.secrets).  The file must normally not be readable  by  "other";  see
              "strict modes".


       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. The hostname as determined by a reverse lookup will  be  matched
                     (case insensitive) against the pattern. Only an exact match is allowed in.

              o      a  hostname  pattern using wildcards. These are matched using the same rules
                     as normal unix filename matching. If the pattern matches then the client  is
                     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 connec-
              tion is rejected. See the "hosts allow" parameter for more information.

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


       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 some-
              what 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").

              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

              o      %b the number of bytes actually transferred

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

              o      %c the checksum bytes received for this file (only when sending)

              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

              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  --item-
              ize-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  pre-
              vent  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 suf-
              fixes that are not compressed by default.  Specifying a value for  the  "dont  com-
              press" 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.

              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 num-
                     bered values. RSYNC_ARG0 is always "rsyncd", and the last value  contains  a
                     single period.

              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.


AUTHENTICATION STRENGTH
       The  authentication  protocol used in rsync is a 128 bit MD4 based challenge response sys-
       tem. 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 recom-
       mend 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 = /etc/rsyncd.secrets



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

              tridge:mypass
              susan:herpass



FILES
       /etc/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 3.0.3 of rsync.


CREDITS
       rsync is distributed under the GNU 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  con-
       tributed to it.

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



                                           29 Jun 2008                             rsyncd.conf(5)

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