redhat init script for consul

gistfile1.sh

#!/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 $?

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

Let me know if you have any issues with it.

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"
}

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.

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!

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