PULSE(8)PULSE(8)NAMEpulse - heartbeating daemon for monitoring the health of cluster nodes
SYNOPSISpulse [-c file|--configfile= file] [-n|--nodaemon]
[--forceactive] [--lvs= path] [--fos= path]
[-v|--verbose] [-t|--test-start] [--norun]
[-?|--help] [--usage] [--version]
DESCRIPTIONpulse is a daemon used by lvsd nodes to monitor one another's health
and to initiate the failover of the lvsd or fos daemon. It makes use
of the lvs.cf(5) configuration file for items such as length of time
between heartbeats and length of time before declaring the remote
server to be dead and initiate a failover.
pulse, which runs on the primary and backup nodes, is used by each to
determine that the other is still alive. If the backup node fails to
receive a heartbeat from the primary node after a set amount of time
(specified in lvs.cf), it will assume ownership of all virtual ser‐
vice(s) being provided by the primary node. Its takeover process
includes bringing up aliased device(s) for all virtual service(s) as
well as sending out gratuitous ARPs to associate the floating IP(s)
with the MAC address of the backup node.
If and when a failed primary node returns to a functioning status, it
assumes the backup role unless specifically forced to assume the pri‐
mary role. To reduce the number of faults seen by clients and avoid the
breaking persistent client connections, you should minimize the number
of failovers.
OPTIONS-c file|--configfile= file
Normally, pulse uses lvs.cf as its configuration file, but this
can be overridden and another file can be used.
-n|--nodaemon
Normally, pulse runs as a daemon but with this option runs in
the foreground. When running in this mode, pulse sends all out‐
put to STDOUT instead of to syslog.
--forceactive
When this flag is used, the machine that pulse runs on will
forceably take over as the primary lvsd router and other machine
will become the backup.
--lvs= path
By default, pulse looks in /usr/sbin for lvsd; use path to tell
pulse to look elsewhere for the program.
--fos= path
By default, pulse looks in /usr/sbin for fos; use path to tell
pulse to look elsewhere for the program.
-t|--test-start
Runs pulse in a test mode. Reports, but does not actually start,
the rest of the daemom processes (lvsd, fos, etc.).
--norun
Historical. Same as --test-start.
-v|--verbose
Displays debugging information
-?|--help
Shows a verbose usage listing.
--usage
Outputs a terse argument summary.
--version
Displays program version.
SEE ALSOlvs.cf(5), ipvsadmn(8), lvsd(8). fos(8). nanny(8).
AUTHOR
Erik Troan <ewt@redhat.com>
4th Berkeley Distribution Tue Sep 21 1999 PULSE(8)
