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KEEPALIVED(8) System Manager's Manual KEEPALIVED(8)

NAME

keepalived - load-balancing and high-availability service

SYNOPSIS

keepalived [-f|--use-file=FILE] [-P|--vrrp] [-C|--check] [-l|--log-console] [-D|--log-detail] [-S|--log-facility={0-7}] [-X|--release-vips] [-V|--dont-release-vrrp] [-I|--dont-release-ipvs] [-R|--dont-respawn] [-n|--dont-fork] [-d|--dump-conf] [-p|--pid=FILE] [-r|--vrrp_pid=FILE] [-c|--checkers_pid=FILE] [-a|--address-monitoring] [-x|--snmp] [-A|--snmp-agent-socket=FILE] [-m|--core-dump] [-M|--core-dump-format[=PATTERN]] [-v|--version] [-h|--help]

DESCRIPTION

Keepalived provides simple and robust facilities for load-balancing and high-availability. The load-balancing framework relies on the well-known and widely used Linux Virtual Server (IPVS) kernel module providing Layer4 load-balancing. Keepalived implements a set of checkers to dynamically and adaptively maintain and manage a load-balanced server pool according to their health. Keepalived also implements the VRRPv2 and VRRPv3 protocols to achieve high-availability with director failover.

OPTIONS

Use the specified configuration file. The default configuration file is "/etc/keepalived/keepalived.conf".
Only run the VRRP subsystem. This is useful for configurations that do not use the IPVS load balancer.
Only run the healthcheck subsystem. This is useful for configurations that use the IPVS load balancer with a single director with no failover.
Log messages to the local console. The default behavior is to log messages to syslog.
Detailed log messages.
Set syslog facility to LOG_LOCAL[0-7]. The default syslog facility is LOG_DAEMON.
Drop VIP on transition from signal.
Don't remove VRRP VIPs and VROUTEs on daemon stop. The default behavior is to remove all VIPs and VROUTEs when keepalived exits.
Don't remove IPVS topology on daemon stop. The default behavior it to remove all entries from the IPVS virtual server table when keepalived exits.
Don't respawn child processes. The default behavior is to restart the VRRP and checker processes if either process exits.
Don't fork the daemon process. This option will cause keepalived to run in the foreground.
Dump the configuration data.
Use the specified pidfile for the parent keepalived process. The default pidfile for keepalived is "/var/run/keepalived.pid", unless a network namespace is being used. See NAMESPACES below for more details.
Use the specified pidfile for the VRRP child process. The default pidfile for the VRRP child process is "/var/run/keepalived_vrrp.pid", unless a network namespace is being used.
Use the specified pidfile for checkers child process. The default pidfile for the checker child process is "/var/run/keepalived_checkers.pid" unless a network namespace is being used.
Log all address additions/deletions reported by netlink.
Enable the SNMP subsystem.
Use the specified socket for connection to SNMP master agent.
Override the RLIMIT_CORE hard and soft limits to enable keepalived to produce a coredump in the event of a segfault or other failure. This is most useful if keepalived has been built with 'make debug'. Core dumps will be created in /, unless keepalived is run with the --dont-fork option, in which case they will be created in the directory from which keepalived was run, or they will be created in the directory of a configuraton file if the fault occurs while reading the file.
Sets option --core-dump, and also updates /proc/sys/kernel/core_pattern to the pattern specified, or 'core' if none specified. Provided the parent process doesn't terminate abnormally, it will restore /proc/sys/kernel/core_pattern to its original value on exit.

Note: This will also affect any other process producing a core dump while keepalived is running.

Display the version and exit.
Display this help message and exit.

NAMESPACES

keepalived can be run in a network namespace (see keepalived.conf(5) for configuration details). When run in a network namespace, a local mount namespace is also created, and /var/run/keepalived/keepalived_NamespaceName is mounted on /var/run/keepalived. By default, pid files with the usual default names are then created in /var/run/keepalived from the perspective of a process in the mount namespace, and they will be visible in /var/run/keepalived/keepalived_NamespaceName for a process running in the default mount namespace.

SIGNALS

keepalived reacts to a set of signals. You can send a signal to the parent keepalived process using the following:

kill -SIGNAL $(cat /var/run/keepalived.pid)

Note that -SIGNAL must be replaced with the actual signal you are trying to send, e.g. with HUP. So it then becomes:

kill -HUP $(cat /var/run/keepalived.pid)
This causes keepalived to close down all interfaces, reload its configuration, and start up with the new configuration.
keepalived will shut down.
Write configuration data to /tmp/keepalived.data
Write statistics info to /tmp/keepalived.stats

SEE ALSO

keepalived.conf(5), ipvsadm(8)

AUTHOR

This man page was written by Ryan O'Hara <rohara@redhat.com>

April 2016