Detect when database has started

Question

Detect when database has started

I have a Node.JS server, with a MongoDB database. I start the database within Node.JS as follows:

(function startDatabase() {
    exec('killall -15 mongod; mongod --dbpath ./db', function (err, stdout, stderr) {
        if(err) {
            console.error('Database error! Aborting.');
            process.exit(1);
        }
    });
}());

The problem with this approach is that I have no way of knowing that the database has successfully started, because mongod never returns (unless there is an error), so I never get to see stdout.

How can I start the MongoDB database within Node.JS and detect when it has started?

node.js
mongodb

Answer 1

You can do :

service mongod status    //check status
service mongod start     //start
service mongod stop      //stop
service mongod restart   //restart

or instead of service mongod /etc/init.d/mongod

startDatabase should use service mongod start not kill the service and then start. It is not graceful close and you can loose data/corrupt files. If you want to restart it then use service mongod restart. But check status to stop or restart.