Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.
It is a great solution for communities and companies wanting to privately host their own chat service or for developers looking forward to build and evolve their own chat platforms.
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First, start an instance of mongo:
docker run --name db -d mongo:3.0 mongod --smallfiles
Then start Rocket.Chat linked to this mongo instance:
docker run --name rocketchat --link db:db -d rocket.chat
This will start a Rocket.Chat instance listening on the default Meteor port of 3000 on the container.
If you'd like to be able to access the instance directly at standard port on the host machine:
docker run --name rocketchat -p 80:3000 --env ROOT_URL=http://localhost --link db:db -d rocket.chat
Then, access it via http://localhost in a browser. Replace localhost in ROOT_URL with your own domain name if you are hosting at your own domain.
If you're using a third party Mongo provider, or working with Kubernetes, you need to override the MONGO_URL environment variable:
docker run --name rocketchat -p 80:3000 --env ROOT_URL=http://localhost --env MONGO_URL=mongodb://mymongourl/mydb -d rocket.chat