Provided by: haproxy_1.8.13-2build1_amd64 bug


       HAProxy - fast and reliable http reverse proxy and load balancer


       haproxy  -f  <configuration file|dir>  [-L <name>]  [-n maxconn]  [-N maxconn]  [-C <dir>]
       [-v|-vv]  [-d]  [-D]  [-q]  [-V]  [-c]  [-p <pidfile>]  [-dk]  [-ds]  [-de]  [-dp]   [-db]
       [-dM[<byte>]] [-m <megs>] [-x <unix_socket>] [{-sf|-st} pidlist...]


       HAProxy  is  a  TCP/HTTP  reverse proxy which is particularly suited for high availability
       environments. Indeed, it can:
        - route HTTP requests depending on statically assigned cookies ;
        - spread the load among several servers while assuring server
          persistence through the use of HTTP cookies ;
        - switch to backup servers in the event a main one fails ;
        - accept connections to special ports dedicated to service
          monitoring ;
        - stop accepting connections without breaking existing ones ;
        - add/modify/delete HTTP headers both ways ;
        - block requests matching a particular pattern ;
        - hold clients to the right application server depending on
          application cookies
        - report detailed status as HTML pages to authenticated users from an
          URI intercepted from the application.

       It needs very little resource. Its event-driven architecture allows it  to  easily  handle
       thousands  of  simultaneous  connections  on  hundreds  of  instances  without risking the
       system's stability.


       -f <configuration file|dir>
              Specify configuration file or directory path. If the argument is  a  directory  the
              files  (and only files) it contains are added in lexical order (using LC_COLLATE=C)
              ; only non hidden files with ".cfg" extension are added.

       -L <name>
              Set the local instance's peer name. Peers are defined in  the  peers  configuration
              section  and  used  for  syncing  stick tables between different instances. If this
              option is not specified, the local hostname is used as peer name.

       -n <maxconn>
              Set the high limit for the total number of simultaneous connections.

       -N <maxconn>
              Set the high limit for the per-listener number of simultaneous connections.

       -C <dir>
              Change directory to <dir> before loading any files.

       -v     Display HAProxy's version.

       -vv    Display HAProxy's version and all build options.

       -d     Start in foreground with debugging mode enabled.  When the proxy runs in this mode,
              it dumps every connections, disconnections, timestamps, and HTTP headers to stdout.
              This should NEVER be used in an init script since it will prevent the  system  from
              starting up.

       -D     Start in daemon mode.

       -Ds    Start in systemd daemon mode, keeping a process in foreground.

       -q     Disable messages on output.

       -V     Displays messages on output even when -q or 'quiet' are specified. Some information
              about pollers and config file are displayed during startup.

       -c     Only checks config file and exits with code 0 if no error was found, or exits  with
              code 1 if a syntax error was found.

       -p <pidfile>
              Ask  the  process  to write down each of its children's pids to this file in daemon

       -dk    Disable use of kqueue(2). kqueue(2) is available only on BSD systems.

       -ds    Disable use of speculative epoll(7). epoll(7) is available only on  Linux  2.6  and
              some custom Linux 2.4 systems.

       -de    Disable  use  of  epoll(7). epoll(7) is available only on Linux 2.6 and some custom
              Linux 2.4 systems.

       -dp    Disables use of poll(2). select(2) might be used instead.

       -dS    Disables use of splice(2), which is broken on older kernels.

       -db    Disables  background  mode  (stays  in  foreground,  useful  for  debugging).   For
              debugging,  the  '-db' option is very useful as it temporarily disables daemon mode
              and multi-process mode. The service can then be stopped by simply pressing  Ctrl-C,
              without having to edit the config nor run full debug.

              Initializes  all allocated memory areas with the given <byte>. This makes it easier
              to detect bugs resulting from uninitialized memory  accesses,  at  the  expense  of
              touching all allocated memory once. If <byte> is not specified, it defaults to 0x50
              (ASCII 'P').

       -m <megs>
              Enforce a memory usage limit to a maximum of <megs> megabytes.

       -sf <pidlist>
              Send FINISH signal to the pids  in  pidlist  after  startup.  The  processes  which
              receive  this  signal  will  wait  for  all sessions to finish before exiting. This
              option must be  specified  last,  followed  by  any  number  of  PIDs.  Technically
              speaking, SIGTTOU and SIGUSR1 are sent.

       -st <pidlist>
              Send  TERMINATE  signal  to  the pids in pidlist after startup. The processes which
              receive this signal will terminate immediately, closing all active  sessions.  This
              option  must  be  specified  last,  followed  by  any  number  of PIDs. Technically
              speaking, SIGTTOU and SIGTERM are sent.

       -x <unix_socket>
              Attempt to connect to the unix socket, and retrieve all the listening sockets  from
              the old process. Those sockets will then be used if possible instead of binding new


       Since HAProxy can run inside a chroot, it  cannot  reliably  access  /dev/log.   For  this
       reason,  it  uses the UDP protocol to send its logs to the server, even if it is the local
       server. People who experience trouble receiving  logs  should  ensure  that  their  syslog
       daemon  listens  to  the  UDP socket.  Several Linux distributions which ship with syslogd
       from the sysklogd package have UDP disabled by default. The -r option must  be  passed  to
       the daemon in order to enable UDP.


       Some  signals  have  a  special  meaning  for the haproxy daemon. Generally, they are used
       between daemons and need not be used by the administrator.

       - SIGUSR1
              Tells the daemon to stop all proxies and exit once all sessions are closed.  It  is
              often referred to as the "soft-stop" signal.

       - SIGTTOU
              Tells the daemon to stop listening to all sockets. Used internally by -sf and -st.

       - SIGTTIN
              Tells  the  daemon  to  restart  listening  to  all  sockets  after a SIGTTOU. Used
              internally when there was a problem during hot reconfiguration.

       - SIGINT and SIGTERM
              Both signals can be used to quickly stop the daemon.

       - SIGHUP
              Dumps the status of all proxies and servers into the logs. Mostly used for trouble-
              shooting purposes.

       - SIGQUIT
              Dumps information about memory pools on stderr. Mostly used for debugging purposes.

       - SIGPIPE
              This signal is intercepted and ignored on systems without MSG_NOSIGNAL.


       A  much better documentation can be found in configuration.txt. On Debian systems, you can
       find this file in /usr/share/doc/haproxy/configuration.txt.gz.


       HAProxy was written by Willy Tarreau. This man page was written by Arnaud Cornet and Willy

                                          17 August 2007                               HAPROXY(1)