Meteor without mongo

问题:

With 0.6.5 release it is possible to develop non web apps with meteor. I rebuild it from scratch for ARM processor but I don't want DB support at all. (Mongo is a processor killer, has to high footprint and I simply don't need it)

ARM should work as DDP client only, with this in mind I build it manually without mongo.

And tried to build simplest app possible only 1 package at start (all standard packages removed)

meteor

and one file in server folder

main = function(argv){
  return "DAEMON"
}

Meteor.setInterval(function(){
  console.log("HellOnWorld");
},1000);

On machine with full meteor install it works as expected but without mongo installed I got errors

Unexpected mongo exit code 127. Restarting.
Unexpected mongo exit code 127. Restarting.
Initializing mongo database... this may take a moment.
Unexpected mongo exit code 127. Restarting.
Can't start mongod

Obviously I don't have and want mongo.

Is there any way to start meteor without waiting for mongo db ?

Meteor team plans to support other db's so it must be implemented sooner or later.

回答1:

UPDATE

For newer versions of Meteor you need to remove the mongo package. The mongo package is embedded in the meteor-platform package. So you need to remove that and add all the rest back (from https://github.com/meteor/meteor/tree/devel/packages/meteor-platform):

meteor remove meteor-platform
meteor add  meteor webapp logging tracker session ddp blaze spacebars templating check underscore jquery random ejson templating check underscore jquery random ejson

Then your app won't use Mongo anymore :).

In dev mode you can get rid of mongo by setting the MONGO_URL environment variable to something else and start meteor. For example: MONGO_URL=mongodb://nowhere meteor

回答2:

Turns out that if you just set any MONGO_URL environment variable before running meteor, it won't start its local MongoDB! Fantastic for testing packages that don't depend on Mongo.

Before:

$ meteor test-packages ./
Testing fortawesome:fontawesome-compat...
[[[[[ Tests ]]]]]

=> Started proxy.
=> Started MongoDB.
=> Started your app.

=> App running at: http://localhost:3000/

After

$ MONGO_URL=mongodb://mysql.com meteor test-packages ./  # haha
Testing fortawesome:fontawesome-compat...
[[[[[ Tests ]]]]]

=> Started proxy.
=> Started your app.

=> App running at: http://localhost:3000/

Look ma, no Mongo!

I have confirmed that no mongo process is started, and no .meteor/local/db folder is created.

回答3:

In Meteor 0.6.5, you can embed TingoDb, a Node.js implementation of the MongoDB API, with your Meteor bundle instead:

1) Go to the programs/server directory in your bundle and do npm install tingodb to add TingoDb to your bundle.

2) Near the top of programs/server/packages/mongo-livedata.js, with all of the other Npm.require statements, add the following line

var Db = Npm.require('tingodb')().Db;

3) In that same file (programs/server/packages/mongo-livedata.js) replace the following code block

MongoDB.connect(url, options, function(err, db) {
  if (err)
    throw err;
  self.db = db;

  Fiber(function () {
    // drain queue of pending callbacks
    _.each(self._connectCallbacks, function (c) {
      c(db);
    });
  }).run();
});

with this code:

var db = new Db('path/to/your/db/directory', {});
self.db = db;
Fiber(function () {
  _.each(self._connectCallbacks, function (c) {
      c(db);
    });
}).run(); 

The path/to/your/db/directory can be anywhere, but is relative to the programs/server directory in your bundle by default.

4) To run your Meteor bundle, it wants you to export an environment variable called MONGO_URL. You could dive in to the code and remove the checks for this, but since it's never used you can just as easily export a fake MONGO_URL, like the one in your bundle's README file:

export MONGO_URL='mongodb://user:password@host:port/databasename'

5) From your bundle's base directory run node main.js.

Caveat emptor: obviously you're messing around with Meteor internals here, and this will almost assuredly break with future versions.

回答4:

Meteor 1.2.1 - Just set

MONGO_URL=none

for an environment variable. (none isn't a keyword, anything invalid appears to prevent mongo from starting)

回答5:

As a weird possibility, make a mock mongo server on the right port, and set your environnmental variable to access it. I'd bet you only need a few handshake routines be implemented and no more traffic after that. Beyond my capability, but it does have the advantage of not needing to adopt to code changes as things shift.

回答6:

The listed answers are not working with the Meteor 1.x. Following is my way to run meteor without mongodb and doesn't need modify anything(neither source code nor packages configuration) in meteor.

1. git clone https://github.com/solderzzc/mongodb-fs

2. cd mongodb-fs && npm install && node samples/test-server.js

   you will see following console log if everything goes well

   

3. meteor create --example leaderboard && cd leaderboard

   MONGO_URL=mongodb://localhost:27027/fakedb meteor

Add point to the player, and check with the mongo command line: mongo localhost:27027/fakedb