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forked from pool/haproxy
haproxy/haproxy.init
2013-12-18 15:53:39 +00:00

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#!/bin/sh
#
### BEGIN INIT INFO
# Provides: haproxy
# Required-Start: $syslog $remote_fs
# Should-Start: $time ypbind sendmail
# Required-Stop: $syslog $remote_fs
# Should-Stop: $time ypbind sendmail
# Default-Start: 3 5
# Default-Stop: 0 1 2 6
# Short-Description: haproxy
# Description: Start haproxy a reliable, high performance TCP/HTTP load balancer
### END INIT INFO
#
# Any extensions to the keywords given above should be preceeded by
# X-VendorTag- (X-UnitedLinux- X-SuSE- for us) according to LSB.
#
# Notes on Required-Start/Should-Start:
# * There are two different issues that are solved by Required-Start
# and Should-Start
# (a) Hard dependencies: This is used by the runlevel editor to determine
# which services absolutely need to be started to make the start of
# this service make sense. Example: nfsserver should have
# Required-Start: $portmap
# Also, required services are started before the dependent ones.
# The runlevel editor will warn about such missing hard dependencies
# and suggest enabling. During system startup, you may expect an error,
# if the dependency is not fulfilled.
# (b) Specifying the init script ordering, not real (hard) dependencies.
# This is needed by insserv to determine which service should be
# started first (and at a later stage what services can be started
# in parallel). The tag Should-Start: is used for this.
# It tells, that if a service is available, it should be started
# before. If not, never mind.
# * When specifying hard dependencies or ordering requirements, you can
# use names of services (contents of their Provides: section)
# or pseudo names starting with a $. The following ones are available
# according to LSB (1.1):
# $local_fs all local file systems are mounted
# (most services should need this!)
# $remote_fs all remote file systems are mounted
# (note that /usr may be remote, so
# many services should Require this!)
# $syslog system logging facility up
# $network low level networking (eth card, ...)
# $named hostname resolution available
# $netdaemons all network daemons are running
# The $netdaemons pseudo service has been removed in LSB 1.2.
# For now, we still offer it for backward compatibility.
# These are new (LSB 1.2):
# $time the system time has been set correctly
# $portmap SunRPC portmapping service available
# UnitedLinux extensions:
# $ALL indicates that a script should be inserted
# at the end
# * The services specified in the stop tags
# (Required-Stop/Should-Stop)
# specify which services need to be still running when this service
# is shut down. Often the entries there are just copies or a subset
# from the respective start tag.
# * Should-Start/Stop are now part of LSB as of 2.0,
# formerly SUSE/Unitedlinux used X-UnitedLinux-Should-Start/-Stop.
# insserv does support both variants.
# * X-UnitedLinux-Default-Enabled: yes/no is used at installation time
# (%fillup_and_insserv macro in %post of many RPMs) to specify whether
# a startup script should default to be enabled after installation.
# It's not used by insserv.
#
# Note on runlevels:
# 0 - halt/poweroff 6 - reboot
# 1 - single user 2 - multiuser without network exported
# 3 - multiuser w/ network (text mode) 5 - multiuser w/ network and X11 (xdm)
#
# Note on script names:
# http://www.linuxbase.org/spec/refspecs/LSB_1.3.0/gLSB/gLSB/scrptnames.html
# A registry has been set up to manage the init script namespace.
# http://www.lanana.org/
# Please use the names already registered or register one or use a
# vendor prefix.
# Check for missing binaries (stale symlinks should not happen)
# Note: Special treatment of stop for LSB conformance
HAPROXY_BIN=/usr/sbin/haproxy
test -x $HAPROXY_BIN || { echo "$HAPROXY_BIN not installed";
if [ "$1" = "stop" ]; then exit 0;
else exit 5; fi; }
HAPROXY_PID="/var/run/haproxy.pid"
HAPROXY_CONF="/etc/haproxy/haproxy.cfg"
## Check for existence of needed config file and read it
#HAPROXY_CONFIG=/etc/sysconfig/haproxy
#test -r $HAPROXY_CONFIG || { echo "$HAPROXY_CONFIG not existing";
# if [ "$1" = "stop" ]; then exit 0;
# else exit 6; fi; }
#
## Read config
#. $HAPROXY_CONFIG
# Source LSB init functions
# providing start_daemon, killproc, pidofproc,
# log_success_msg, log_failure_msg and log_warning_msg.
# This is currently not used by UnitedLinux based distributions and
# not needed for init scripts for UnitedLinux only. If it is used,
# the functions from rc.status should not be sourced or used.
#. /lib/lsb/init-functions
# Shell functions sourced from /etc/rc.status:
# rc_check check and set local and overall rc status
# rc_status check and set local and overall rc status
# rc_status -v be verbose in local rc status and clear it afterwards
# rc_status -v -r ditto and clear both the local and overall rc status
# rc_status -s display "skipped" and exit with status 3
# rc_status -u display "unused" and exit with status 3
# rc_failed set local and overall rc status to failed
# rc_failed <num> set local and overall rc status to <num>
# rc_reset clear both the local and overall rc status
# rc_exit exit appropriate to overall rc status
# rc_active checks whether a service is activated by symlinks
. /etc/rc.status
# Reset status of this service
rc_reset
# Return values acc. to LSB for all commands but status:
# 0 - success
# 1 - generic or unspecified error
# 2 - invalid or excess argument(s)
# 3 - unimplemented feature (e.g. "reload")
# 4 - user had insufficient privileges
# 5 - program is not installed
# 6 - program is not configured
# 7 - program is not running
# 8--199 - reserved (8--99 LSB, 100--149 distrib, 150--199 appl)
#
# Note that starting an already running service, stopping
# or restarting a not-running service as well as the restart
# with force-reload (in case signaling is not supported) are
# considered a success.
function haproxy_check() {
HAPROXY_CONFIG_CHECK="$($HAPROXY_BIN -c -q -f $HAPROXY_CONF 2>&1)"
if [ $? -ne 0 ] ; then
echo "" >&2
echo "$HAPROXY_CONFIG_CHECK" >&2
rc_failed
rc_status -v
exit 1
else
return 0
fi
}
case "$1" in
start)
echo -n "Starting haproxy "
## Start daemon with startproc(8). If this fails
## the return value is set appropriately by startproc.
haproxy_check
/sbin/startproc $HAPROXY_BIN -D -f $HAPROXY_CONF -p $HAPROXY_PID
# Remember status and be verbose
rc_status -v
;;
stop)
echo -n "Shutting down haproxy "
## Stop daemon with killproc(8) and if this fails
## killproc sets the return value according to LSB.
/sbin/killproc -TERM $HAPROXY_BIN
# Remember status and be verbose
rc_status -v
;;
try-restart|condrestart)
## Do a restart only if the service was active before.
## Note: try-restart is now part of LSB (as of 1.9).
## RH has a similar command named condrestart.
if test "$1" = "condrestart"; then
echo "${attn} Use try-restart ${done}(LSB)${attn} rather than condrestart ${warn}(RH)${norm}"
fi
$0 status
if test $? = 0; then
# we us reload here for a graceful restart during update
$0 reload
else
rc_reset # Not running is not a failure.
fi
# Remember status and be quiet
rc_status
;;
restart)
## Stop the service and regardless of whether it was
## running or not, start it again.
haproxy_check
$0 stop
$0 start
# Remember status and be quiet
rc_status
;;
check)
## Stop the service and regardless of whether it was
## running or not, start it again.
echo -n "Checking config of haproxy "
haproxy_check
rc_status -v
;;
reload|force-reload)
## Like force-reload, but if daemon does not support
## signaling, do nothing (!)
haproxy_check
# If it supports signaling:
echo -n "Reload service haproxy "
$HAPROXY_BIN -p $HAPROXY_PID -D -f $HAPROXY_CONF -sf $(cat $HAPROXY_PID)
rc_status -v
;;
status)
echo -n "Checking for service haproxy "
## Check status with checkproc(8), if process is running
## checkproc will return with exit status 0.
# Return value is slightly different for the status command:
# 0 - service up and running
# 1 - service dead, but /var/run/ pid file exists
# 2 - service dead, but /var/lock/ lock file exists
# 3 - service not running (unused)
# 4 - service status unknown :-(
# 5--199 reserved (5--99 LSB, 100--149 distro, 150--199 appl.)
# NOTE: checkproc returns LSB compliant status values.
/sbin/checkproc $HAPROXY_BIN
# NOTE: rc_status knows that we called this init script with
# "status" option and adapts its messages accordingly.
rc_status -v
;;
probe)
## Optional: Probe for the necessity of a reload, print out the
## argument to this init script which is required for a reload.
## Note: probe is not (yet) part of LSB (as of 1.9)
test $HAPROXY_CONF -nt $HAPROXY_PID && echo reload
;;
*)
echo "Usage: $0 {start|stop|status|try-restart|restart|force-reload|reload|probe}"
exit 1
;;
esac
rc_exit