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.TH KEEPALIVED "8" "July 2018"
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.na
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.nh
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.SH "NAME"
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keepalived \- load\-balancing and high\-availability service
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.SH "SYNOPSIS"
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\fBkeepalived\fP
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[\fB\-f\fP|\fB\-\-use\-file\fP=FILE]
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[\fB\-P\fP|\fB\-\-vrrp\fP]
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[\fB\-C\fP|\fB\-\-check\fP]
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[\fB\-B\fP|\fB\-\-no_bfd\fP]
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[\fB\-\-all\fP]
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[\fB\-l\fP|\fB\-\-log\-console\fP]
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[\fB\-D\fP|\fB\-\-log\-detail\fP]
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[\fB\-S\fP|\fB\-\-log\-facility\fP={0-7}]
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[\fB\-g\fP|\fB\-\-log\-file\fP=FILE]
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[\fB\-\-flush\-log\-file\fP]
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[\fB\-G\fP|\fB\-\-no\-syslog\fP]
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[\fB\-X\fP|\fB\-\-release\-vips\fP]
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[\fB\-V\fP|\fB\-\-dont\-release\-vrrp\fP]
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[\fB\-I\fP|\fB\-\-dont\-release\-ipvs\fP]
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[\fB\-R\fP|\fB\-\-dont\-respawn\fP]
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[\fB\-n\fP|\fB\-\-dont\-fork\fP]
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[\fB\-d\fP|\fB\-\-dump\-conf\fP]
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[\fB\-p\fP|\fB\-\-pid\fP=FILE]
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[\fB\-r\fP|\fB\-\-vrrp_pid\fP=FILE]
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[\fB\-c\fP|\fB\-\-checkers_pid\fP=FILE]
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[\fB\-a\fP|\fB\-\-address-monitoring\fP]
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[\fB\-b\fP|\fB\-\-bfd_pid\fP=FILE]
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[\fB\-s\fP|\fB\-\-namespace\fP=NAME]
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[\fB\-i\fP|\fB\-\-config-id\fP id]
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[\fB\-x\fP|\fB\-\-snmp\fP]
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[\fB\-A\fP|\fB\-\-snmp-agent-socket\fP=FILE]
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[\fB\-u\fP|\fB\-\-umask\fP=NUMBER]
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[\fB\-m\fP|\fB\-\-core\-dump\fP]
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[\fB\-M\fP|\fB\-\-core\-dump\-pattern\fP[=PATTERN]]
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[\fB\-\-signum\fP=SIGFUNC]
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[\fB\-t\fP|\fB\-\-config\-test\fP[=FILE]]
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[\fB\-\-perf\fP[={all|run|end}]]
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[\fB\-\-debug\fP[=debug-options]]
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[\fB\-v\fP|\fB\-\-version\fP]
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[\fB\-h\fP|\fB\-\-help\fP]
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.SH "DESCRIPTION"
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Keepalived provides simple and robust facilities for load\-balancing
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and high\-availability. The load\-balancing framework relies on the
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well\-known and widely used Linux Virtual Server (IPVS) kernel module
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providing Layer4 load\-balancing. Keepalived implements a set of
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checkers to dynamically and adaptively maintain and manage a
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load\-balanced server pool according to their health. Keepalived also
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implements the VRRPv2 and VRRPv3 protocols to achieve high\-availability
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with director failover.
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.SH "OPTIONS"
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.TP
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\fB -f, --use-file\fP=FILE
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Use the specified configuration file. The default configuration file
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is "/etc/keepalived/keepalived.conf".
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.TP
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\fB -P, --vrrp\fP
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Only run the VRRP subsystem. This is useful for configurations that do
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not use the IPVS load balancer.
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.TP
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\fB -C, --check\fP
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Only run the healthcheck subsystem. This is useful for configurations
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that use the IPVS load balancer with a single director with no failover.
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.TP
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\fB -B, --no_bfd\fP
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Don't run the BFD subsystem.
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.TP
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\fB --all\fP
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Run all subsystems, even if they have no configuration.
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.TP
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\fB -l, --log-console\fP
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Log messages to the local console. The default behavior is to log
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messages to syslog.
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.TP
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\fB -D, --log-detail\fP
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Detailed log messages.
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.TP
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\fB -S, --log-facility\fP=[0-7]
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Set syslog facility to LOG_LOCAL[0-7]. The default syslog facility is LOG_DAEMON.
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.TP
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\fB -g, --log-file\fP=FILE
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Write log entries to FILE. FILE will have _vrrp, _healthcheckers, and _bfd
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inserted before the last '.' in FILE for the log output for those processes.
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.TP
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\fB --flush-log-file\fP
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If using the -g option, the log file stream will be flushed after each write.
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.TP
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\fB -G, --no-syslog\fP
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Do not write log entries to syslog. This can be useful if the rate of writing
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log entries is sufficiently high that syslog will rate limit them, and the -g
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option is used instead.
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.TP
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\fB -X, --release-vips\fP
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Drop VIP on transition from signal.
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.TP
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\fB -V, --dont-release-vrrp\fP
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Don't remove VRRP VIPs and VROUTEs on daemon stop. The default
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behavior is to remove all VIPs and VROUTEs when keepalived exits.
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.TP
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\fB -I, --dont-release-ipvs\fP
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Don't remove IPVS topology on daemon stop. The default behavior it to
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remove all entries from the IPVS virtual server table when
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keepalived exits.
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.TP
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\fB -R, --dont-respawn\fP
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Don't respawn child processes. The default behavior is to restart the
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VRRP and checker processes if either process exits.
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.TP
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\fB -n, --dont-fork\fP
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Don't fork the daemon process. This option will cause keepalived to
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run in the foreground.
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.TP
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\fB -d, --dump-conf\fP
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Dump the configuration data.
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.TP
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\fB -p, --pid\fP=FILE
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Use the specified pidfile for the parent keepalived process. The default
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pidfile for keepalived is "/run/keepalived.pid", unless a network
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namespace is being used. See
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.B NAMESPACES
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below for more details.
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.TP
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\fB -r, --vrrp_pid\fP=FILE
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Use the specified pidfile for the VRRP child process. The default pidfile
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for the VRRP child process is "/run/keepalived_vrrp.pid", unless a
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network namespace is being used.
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.TP
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\fB -c, --checkers_pid\fP=FILE
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Use the specified pidfile for checkers child process. The default pidfile
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for the checker child process is "/run/keepalived_checkers.pid" unless
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a network namespace is being used.
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.TP
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\fB -a, --address-monitoring\fP
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Log all address additions/deletions reported by netlink.
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.TP
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\fB -b, --bfd_pid\fP=FILE
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Use the specified pidfile for the BFD child process. The default pidfile
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for the BFD child process is "/run/keepalived_bfd.pid" unless
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a network namespace is being used.
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.TP
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\fB -s, --namespace\fP=NAME
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Run keepalived in network namespace NAME. See
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.B NAMESPACES
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below for more details.
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.TP
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\fB -i, --config-id ID
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Use configuration id ID, for conditional configuration (defaults to
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hostname without the domain name).
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.TP
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\fB -x, --snmp\fP
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Enable the SNMP subsystem.
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.TP
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\fB -A, --snmp-agent-socket\fP=FILE
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Use the specified socket for connection to SNMP master agent.
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.TP
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\fB -u, --umask\fP=NUMBER
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The umask specified in the usual numeric way - see man umask(2)
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.TP
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\fB -m, --core-dump\fP
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Override the RLIMIT_CORE hard and soft limits to enable keepalived to
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produce a coredump in the event of a segfault or other failure.
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This is most useful if keepalived has been built with 'make debug'.
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Core dumps will be created in /, unless keepalived is run with the
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--dont-fork option, in which case they will be created in the directory
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from which keepalived was run, or they will be created in the directory
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of a configuraton file if the fault occurs while reading the file.
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.TP
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\fB -M, --core-dump-pattern\fP[=PATTERN]
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Sets option --core-dump, and also updates /proc/sys/kernel/core_pattern
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to the pattern specified, or 'core' if none specified.
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Provided the parent process doesn't terminate abnormally, it will restore
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/proc/sys/kernel/core_pattern to its original value on exit.
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\fBNote:\fP This will also affect any other process producing a core dump while keepalived is running.
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.TP
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\fB --signum\fP=PATTERN
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Returns the signal number to use for STOP, RELOAD, DATA, STATS, STATS_CLEAR and JSON.
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For example, to stop keepalived running, execute:
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.IP
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.nf
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kill -s $(keepalived --signum=STOP) $(cat /run/keepalived.pid)
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.fi
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.TP
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\fB -t, --config-test\fP[=FILE]
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Keepalived will check the configuration file and exit with non-zero exit
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status if there are errors in the configuration, otherwise it exits with
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exit status 0 (see \fBExit status\fP below for details).
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Rather that writing to syslog, it will write diagnostic messages to stderr
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unless file is specified, in which case it will write to the file.
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.TP
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\fB --perf\fP[={all|run|end}]
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Record perf data for vrrp process. Data will be written to /perf_vrrp.data.
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The data recorded is for use with the perf tool.
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.TP
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\fB --debug\fP[=debug-options]]
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Enables debug options if they have been compiled into keepalived.
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\fIdebug-options\fP is made up of a sequence of strings of the form Ulll.
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.br
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The upper case letter specifies the debug option, and the lower case letters
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specify for which processes the option is to be enabled.
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.br
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If a debug option is not followed by any lower case letters, the debug option
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is enabled for all processes.
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.PP
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.RS
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The characters to identify the processes are:
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.TS
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tab(@);
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c l
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c l.
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Chr@Process
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_
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p@Parent process
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b@BFD process
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c@Checker process
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v@VRRP process
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.TE
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.PP
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The characters used to identify the debug options are:
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.TS
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tab(@);
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c l.
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Chr@Debug option
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_
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D@Epoll thread dump
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E@Epoll debug
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F@VRRP fd debug
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N@Netlink timers
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P@Network timestamp
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X@Regex timers
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M@Email alert debug
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T@Timer debug
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S@TSM debug
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R@Regex debug
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.TE
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.PP
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\fBExample:\fP --debug=DvEcvNR
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.RE
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.TP
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\fB -v, --version\fP
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Display the version and exit.
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.TP
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\fB -h, --help\fP
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Display this help message and exit.
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.SS "Exit status:"
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.TP
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0
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if OK
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.TP
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1
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if unable to malloc memory
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.TP
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2
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if cannot initialise subsystems
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.TP
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3
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if running with --config-test and configuration cannot be run
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.TP
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4
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if running with --config-test and there are configuration errors but keepalived
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will run after modifying the configuration
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.TP
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5
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if running with --config-test and script security hasn't been enabled but scripts
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are configured.
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.SH NAMESPACES
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.B keepalived
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can be run in a network namespace (see
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\fBkeepalived.conf\fP(5) for configuration details). When
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run in a network namespace, a local mount namespace is also
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created, and /run/keepalived/keepalived_NamespaceName
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is mounted on /run/keepalived. By default, pid files with
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the usual default names are then created in
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/run/keepalived from the perspective of a process in the
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mount namespace, and they will be visible in
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/run/keepalived/keepalived_NamespaceName for a process
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running in the default mount namespace.
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.SH SIGNALS
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.B keepalived
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reacts to a set of signals. You can send a signal to
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the parent
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.B keepalived
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process using the following:
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.IP
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.nf
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kill -SIGNAL $(cat /run/keepalived.pid)
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.fi
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.PP
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or better:
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.IP
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.nf
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kill -s $(keepalived --signum=SIGFUNC) $(cat /run/keepalived.pid)
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.fi
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.PP
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Note that if the first option is used, -SIGNAL must be
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replaced with the actual signal you are trying to send,
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e.g. with HUP. So it then becomes:
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.IP
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.nf
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kill -HUP $(cat /run/keepalived.pid)
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.fi
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.PP
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Signals other than for STOP, RELOAD, DATA and STATS may change depending
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on the kernel, and also what functionality is included in the version of
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the keepalived depending on the build options used.
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.PP
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.TP
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.B HUP\fP or \fBSIGFUNC=RELOAD
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This causes
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.B keepalived
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to close down all interfaces, reload its configuration, and
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start up with the new configuration.
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.TP
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.B TERM\fP, \fBINT\fP or \fBSIGFUNC=STOP
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.B keepalived
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will shut down.
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.TP
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.B USR1\fP or \fBSIGFUNC=DATA
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Write configuration data to
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.B /tmp/keepalived.data
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.TP
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.B USR2\fP or \fBSIGFUNC=STATS
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Write statistics info to
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.B /tmp/keepalived.stats
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.TP
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.B SIGFUNC=STATS_CLEAR
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Write statistics info to
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.B /tmp/keepalived.stats
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and clear the statistics counters
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.TP
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.B SIGFUNC=JSON
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Write configuration data in JSON format to
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.B /tmp/keepalived.json
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.LP
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.SH "USING KEEPALIVED WITH FIREWALLD"
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If you are running a firewall (see
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.BR firewalld (8) )
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you must allow VRRP protocol traffic through the firewall. For example
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if this instance of
|
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.B keepalived(8)
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has a peer node on IPv4 address 192.168.0.1:
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.IP
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.nf
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# firewall-cmd \\
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--add-rich-rule="rule family='ipv4' \\
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source address='192.168.0.1' \\
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protocol value='vrrp' accept" --permanent
|
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# firewall-cmd --reload
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.fi
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.SH "SEE ALSO"
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\fBkeepalived.conf\fP(5), \fBipvsadm\fP(8)
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.SH "AUTHOR"
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This man page was written by Ryan O'Hara <rohara@redhat.com>
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