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

Mongo Multi instances

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]

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