Skip to content

Instantly share code, notes, and snippets.

@blalor
Created May 2, 2014 04:37
Show Gist options
  • Star 29 You must be signed in to star a gist
  • Fork 16 You must be signed in to fork a gist
  • Save blalor/c325d500818361e28daf to your computer and use it in GitHub Desktop.
Save blalor/c325d500818361e28daf to your computer and use it in GitHub Desktop.
redhat init script for consul
#!/bin/bash
#
# consul Manage the consul agent
#
# chkconfig: 2345 95 95
# description: Consul is a tool for service discovery and configuration
# processname: consul
# config: /etc/consul.conf
# pidfile: /var/run/consul.pid
### BEGIN INIT INFO
# Provides: consul
# Required-Start: $local_fs $network
# Required-Stop:
# Should-Start:
# Should-Stop:
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Manage the consul agent
# Description: Consul is a tool for service discovery and configuration
### END INIT INFO
# source function library
. /etc/rc.d/init.d/functions
prog="consul"
user="consul"
exec="/usr/local/bin/$prog"
pidfile="/var/run/$prog.pid"
lockfile="/var/lock/subsys/$prog"
logfile="/var/log/$prog"
conffile="/etc/consul.conf"
confdir="/etc/consul.d"
# pull in sysconfig settings
[ -e /etc/sysconfig/$prog ] && . /etc/sysconfig/$prog
export GOMAXPROCS=${GOMAXPROCS:-2}
start() {
[ -x $exec ] || exit 5
[ -f $conffile ] || exit 6
[ -d $confdir ] || exit 6
umask 077
touch $logfile $pidfile
chown $user:$user $logfile $pidfile
echo -n $"Starting $prog: "
## holy shell shenanigans, batman!
## daemon can't be backgrounded. we need the pid of the spawned process,
## which is actually done via runuser thanks to --user. you can't do "cmd
## &; action" but you can do "{cmd &}; action".
daemon \
--pidfile=$pidfile \
--user=consul \
" { $exec agent -config-file=$conffile -config-dir=$confdir &>> $logfile & } ; echo \$! >| $pidfile "
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && touch $lockfile
return $RETVAL
}
stop() {
echo -n $"Shutting down $prog: "
## graceful shutdown with SIGINT
killproc -p $pidfile $exec -INT
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && rm -f $lockfile
return $RETVAL
}
restart() {
stop
start
}
reload() {
echo -n $"Reloading $prog: "
killproc -p $pidfile $exec -HUP
echo
}
force_reload() {
restart
}
rh_status() {
status -p "$pidfile" -l $prog $exec
}
rh_status_q() {
rh_status >/dev/null 2>&1
}
case "$1" in
start)
rh_status_q && exit 0
$1
;;
stop)
rh_status_q || exit 0
$1
;;
restart)
$1
;;
reload)
rh_status_q || exit 7
$1
;;
force-reload)
force_reload
;;
status)
rh_status
;;
condrestart|try-restart)
rh_status_q || exit 0
restart
;;
*)
echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload}"
exit 2
esac
exit $?
@legal90
Copy link

legal90 commented Jan 27, 2016

@blalor

holy shell shenanigans, batman!

## daemon can't be backgrounded.  we need the pid of the spawned process,
## which is actually done via runuser thanks to --user.  you can't do "cmd
## &; action" but you can do "{cmd &}; action".

Sorry, but it doesn't work anyway (on CentOS 6.7):

# . /etc/init.d/functions
# daemon \
    --pidfile=/var/run/consul.pid \
    --user=consul \
    " { /usr/local/bin/consul agent -config-file=/etc/consul/consul.json -config-dir=/etc/consul/conf.d &>> /dev/null & } ; echo \$! >| /var/run/consul.pid"

bash: /var/run/consul.pid: Permission denied

Seems like the whole command between double quotes "" is running by the specified user

@torian
Copy link

torian commented Oct 28, 2016

Thanks !
FYI: using your init script in https://github.com/torian/ansible-role-consul

Let me know if you have any issues with it.

@gohonsen
Copy link

gohonsen commented Jan 11, 2018

Does the config file must named with .json end ?
If I use "-config-file=/etc/consul.conf" start consul, it stdout "data_dir cannot be empty" error, but then I change "consul.conf" to "consul.json ", it start success.

the content of config file like this:

{
"data_dir": "/consul/data",
"log_level": "INFO",
"bind_addr": "127.0.0.1",
"client_addr": "0.0.0.0",
"ui": true,
"server": true,
"bootstrap_expect": 1,
"acl_datacenter": "dc1",
"acl_default_policy": "deny"
}

@Zork67
Copy link

Zork67 commented Jan 17, 2018

Does the config file must named with .json end ?
If I use "-config-file=/etc/consul.conf" start consul, it stdout "data_dir cannot be empty" error, but then I change "consul.conf" to "consul.json ", it start success.

Thank you. Renaming to .json helped.

@ArturChe
Copy link

This script works fine while starting consul as sudo su on running instance.

But i got a problem on rebooting EC2 ECS instance - consul agent starting but then shutting down with error : Error starting agent: agent: timeout starting DNS servers.
I believe that it because only root user can listen 53 port, which I specified for consul agent in config:
...
"ports": {"dns": 53}
...

More over, 'sudo service consul status' gives 'consul dead but pid file exists'
Manual start 'sudo service consul start' helps, but I want an stable automatic start on reboot or stop/start instance.

Is their a right solution or what should I check to resolve this problem?

Thanks!

@timhughes
Copy link

Your return value just after daemon in the start function will end up being the return code of echo \$! >| $pidfile and will report that your application started correctly when it actually fails

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment