MongoDB multiple instance upstart scripts: mongodb, mongod --configsvr and mongos

README

MongoDB upstart scripts for Ubuntu.

Run following commands after installing upstart scripts:

ln -s /lib/init/upstart-job /etc/init.d/mongoconf
ln -s /lib/init/upstart-job /etc/init.d/mongodb
ln -s /lib/init/upstart-job /etc/init.d/mongos

To start services use:

service mongodb [start|stop|restart]
service mongoconf [start|stop|restart]
service mongos [start|stop|restart]

etc-mongo.conf

# /etc/mongo.conf
MONGODB_ENABLED=yes
MONGOCONF_ENABLED=no
MONGOS_ENABLED=no

etc-mongoconf.conf

# /etc/mongoconf.conf
#configsvr config file

#start mongod in configsvr mode
configsvr=true

#where to log
logpath=/var/log/mongodb/mongoconf.log

#log overwritten or appended to
logappend=true

#override port
#port=27019

#path to data files
#dbpath=/data/configdb

smallfiles = true

etc-mongos.conf

# /etc/mongos.conf
#mongos config file

#config servers
configdb=host1:27019,host2:27019,host3:27019

#where to log
logpath=/var/log/mongodb/mongos.log

#log overwritten or appended to
logappend=true

#override port
#port=27017

mongoconf.conf

# Ubuntu upstart file at /etc/init/mongoconf.conf

limit nofile 20000 20000

kill timeout 300 # wait 300s between SIGTERM and SIGKILL.

start on runlevel [2345]
stop on runlevel [06]

script
    if [ -f /etc/mongo.conf ]; then . /etc/mongo.conf; fi
    if [ "x$MONGOCONF_ENABLED" = "xyes" ]; then
      ENABLE_MONGOCONF="yes"
      if [ "x$ENABLE_MONGOCONF" = "xyes" ]; then exec start-stop-daemon --make-pidfile --pidfile /var/run/mongoconf.pid  --start --quiet --chuid mongodb --exec  /usr/bin/mongod -- --config /etc/mongoconf.conf; fi
    fi
end script

mongodb.conf

# Ubuntu upstart file at /etc/init/mongodb.conf

limit nofile 20000 20000

kill timeout 300 # wait 300s between SIGTERM and SIGKILL.

pre-start script
    mkdir -p /var/lib/mongodb/
    mkdir -p /var/log/mongodb/
end script

start on runlevel [2345]
stop on runlevel [06]

script
    if [ -f /etc/mongo.conf ]; then . /etc/mongo.conf; fi
    if [ "x$MONGODB_ENABLED" = "xyes" ]; then
	ENABLE_MONGODB="yes"
	if [ -f /etc/default/mongodb ]; then . /etc/default/mongodb; fi
	if [ "x$ENABLE_MONGODB" = "xyes" ]; then exec start-stop-daemon --make-pidfile --pidfile /var/run/mongodb.pid --start --quiet --chuid mongodb --exec  /usr/bin/mongod -- --config /etc/mongodb.conf; fi
    fi
end script

mongos.conf

# Ubuntu upstart file at /etc/init/mongos.conf

limit nofile 20000 20000

kill timeout 300 # wait 300s between SIGTERM and SIGKILL.

start on runlevel [2345]
stop on runlevel [06]

script
    if [ -f /etc/mongo.conf ]; then . /etc/mongo.conf; fi
    if [ "x$MONGOS_ENABLED" = "xyes" ]; then
	ENABLE_MONGOS="yes"
	if [ "x$ENABLE_MONGOS" = "xyes" ]; then exec start-stop-daemon --make-pidfile --pidfile /var/run/mongos.pid  --start --quiet --chuid mongodb --exec  /usr/bin/mongos -- --config /etc/mongos.conf; fi
    fi
end script

Thank you.
Your scripts were very helpful for me.

You're welcome! ;)

Excellent post!

Your scripts in /etc/init are a bit over complicated. ;-)
You source /etc/mongo.conf to check MONGODB_ENABLED, then you set ENABLE_MONGODB, the you check ENABLE_MONGODB. ;-)

Ubuntu (I guess Debian also) enables and disables services in /etc/default/.... (in this case /etc/default/mongodb).
So I recommend to put this into that file:

ENABLE_MONGODB=yes # (or no)
ENABLE_MONGOCONF=yes # (or no)
ENABLE_MONGOS=no # (or no)

This then works with the /etc/init/mongodb.conf that is shipped:

Ubuntu upstart file at /etc/init/mongodb.conf

limit nofile 20000 20000

kill timeout 300 # wait 300s between SIGTERM and SIGKILL.

pre-start script
mkdir -p /var/lib/mongodb/
mkdir -p /var/log/mongodb/
end script

start on runlevel [2345]
stop on runlevel [06]

script
ENABLE_MONGODB="yes"
if [ -f /etc/default/mongodb ]; then . /etc/default/mongodb; fi
if [ "x$ENABLE_MONGODB" = "xyes" ]; then exec start-stop-daemon --start --quiet --chuid mongodb --exec /usr/bin/mongod -- --config /etc/mongodb.conf; fi
end script

Replace the ENABLE_.... with the appropriate value, the exec lines (I think) are fine as you supplied them.

Same result, less complicated scripts. ;-)

Regards, Anton

Keep it simple avoiding "start-stop-daemon", "sudo" and "su". All of them forces you to use "expect" stanza to help upstart track the proper pid of the service.
More specific, start-stop-daemon ensures that you will not have two services with the same name, forcing you to use "--pidfile" variation.

We can use "setuid":

Ubuntu upstart file at /etc/init/mongodb.conf

---

limit nofile 20000 20000

kill timeout 300 # wait 300s between SIGTERM and SIGKILL.

pre-start script
mkdir -p /var/lib/mongodb/
mkdir -p /var/log/mongodb/
end script

start on runlevel [2345]
stop on runlevel [06]

setuid mongodb
exec /usr/bin/mongod --config /etc/mongoconf.conf

I am getting:

Rather than invoking init scripts through /etc/init.d, use the service(8)
utility, e.g. service S20mongoconf start
initctl: Unknown job: S20mongoconf

Since the script you are attempting to invoke has been converted to an
Upstart job, you may also use the start(8) utility, e.g. start S20mongoconf

In the boot log. This is for the config server. What am I doing wrong?

Helpful config files, thanks!
Is there any way to check if a config server is online before starting mongos? Because otherwise it would just fail silently.

@KevinBurton take off the S20, this is simply a way for the system to understand the order these start and stop commands need to be executed.

@sebastianmarr - What did you end up doing to solve the ordering problem?