testmongo.sh

#! /bin/bash

NAME=mongodb
TRIGGER='/etc/init.d/mongodb start'
PIDFILE=/var/run/$NAME.pid
DAEMON=/usr/bin/mongod

ensure_running() {
	if ! running ;  then
		echo "Starting at: `date`"
	    bash -c "$TRIGGER"
	fi
}

running_pid() {
# Check if a given process pid's cmdline matches a given name
    pid=$1
    name=$2
    [ -z "$pid" ] && return 1
    [ ! -d /proc/$pid ] &&  return 1
    cmd=`cat /proc/$pid/cmdline | tr "\000" "\n"|head -n 1 |cut -d : -f 1`
    # Is this the expected server
    [ "$cmd" != "$name" ] &&  return 1
    return 0
}

running() {
# Check if the process is running looking at /proc
# (works for all users)

    # No pidfile, probably no daemon present
    [ ! -f "$PIDFILE" ] && return 1
    pid=`cat $PIDFILE`
    running_pid $pid $DAEMON || return 1
    return 0
}
ensure_running