Bash script to check if MongoDB is running on a certain port

[Phuc Nguyen]

I have two separate apps which use the same database. Normally I start app 1 first, wait for the database to be ready, then start app 2. The MONGO_URL of app 2 is set to "mongodb://127.0.0.1:3001/meteor".

I want to write a bash script which will automate the above process. My question: How can we check if MongoDB is started on port 3001 and is ready to accept connections?

[Arunoda Susiripala]

Use this: https://www.npmjs.org/package/wait-for-mongo

This is something I build for Meteor Up

---

Arunoda Susiripala

I curate Meteor Weekly - Check it out!

On Sun, Jun 22, 2014 at 1:28 PM, Phuc Nguyen <ma...@nguyenphuc.info> wrote:

I have two separate apps which use the same database. Normally I start app 1 first, wait for the database to be ready, then start app 2. The MONGO_URL of app 2 is set to "mongodb://127.0.0.1:3001/meteor".

I want to write a bash script which will automate the above process. My question: How can we check if MongoDB is started on port 3001 and is ready to accept connections?

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[Phuc Nguyen]

That's what I'm looking for. Thanks a lot, Arunoda.

[Roman Zolotarev]

Hi Arunoda,

 

Is there a way to run it inside the application?

Ideally I'd like to have a node process that trying to connect to MondoDB until its loading (on a new server it takes longer).

Thanks!

[Arunoda Susiripala]

Yep. It can. see docs: https://www.npmjs.org/package/wait-for-mongo

---

Arunoda Susiripala

I curate Meteor Weekly - Check it out!

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[Roman Zolotarev]

I've added this to Meteor app, but this didn't help.

# server/startup.coffee

Meteor.startup  ->

  waitForMongo = require 'wait-for-mongo'

  waitForMongo 'mongodb://127.0.0.1:27017/meteor',

    timeout: 1000 * 60 * 5

  , (error) ->

    if error

      console.log "Can not connect to MonogoDB."

    else

      console.log "MongoDB comes online."

On Meteor app start while mongod is DOWN, I'm getting this:

2014-08-21_07:09:38.76568 Exception in callback of async function: Error: failed to connect to [127.0.0.1:27017]

2014-08-21_07:09:38.76576     at null.<anonymous> (/opt/app/programs/server/npm/mongo-livedata/main/node_modules/mongodb/lib/mongodb/connection/server.js:536:74)

2014-08-21_07:09:38.76577     at emit (events.js:106:17)

2014-08-21_07:09:38.76578     at null.<anonymous> (/opt/app/programs/server/npm/mongo-livedata/main/node_modules/mongodb/lib/mongodb/connection/connection_pool.js:150:15)

2014-08-21_07:09:38.76579     at emit (events.js:98:17)

2014-08-21_07:09:38.76580     at Socket.<anonymous> (/opt/app/programs/server/npm/mongo-livedata/main/node_modules/mongodb/lib/mongodb/connection/connection.js:516:10)

2014-08-21_07:09:38.76581     at Socket.emit (events.js:95:17)

2014-08-21_07:09:38.76582     at net.js:440:14

2014-08-21_07:09:38.76582     at process._tickCallback (node.js:419:13)

On Meteor app start while mongod is UP, I'm getting this:

2014-08-21_07:16:01.24517 MongoDB comes online.

[Arunoda Susiripala]

If don't know what require method does. Seems like a async wrapper. 

---

Arunoda Susiripala

I curate Meteor Weekly - Check it out!

--

[Roman Zolotarev]

Dear Arunoda, could you please show an example how to use it inside the app?

Here is my startup.coffee

https://gist.github.com/romanzolotarev/c802bf1a86823dd2ec66

[Roman Zolotarev]

https://gist.github.com/romanzolotarev/c802bf1a86823dd2ec66