This post is older than a year. Consider some information might not be accurate anymore.
Having chat rooms for specific topics or projects have become quite popular. IMHO it is a nice addon for development and deployment lifecycle management. HipChat or Slack are some popular providers. If you want to have an internal chat system, letschat is a quick way to accomplish that. It has some flaws, debugging LDAP was a horror, but basically is good enough in its vanilla state. Take as it is and its free (MIT License). We use it currently for receiving notifications from our continuous integration system.
letschat uses as data storage MongoDB. Start MongoDB as a docker container with a data volume for persistent storage.
docker run --name chat-mongo -v /var/opt/mongodb/data:/data/db -d mongo:latest
MongoDB is not clustered or high available. This is a simple setup.
mkdir -p /var/opt/letschat/uploads
mkdir -p /opt/letschat/config
Place the content of this settings.yml in the created directory.
env: production http: enable: true host: 'localhost' port: 5000 files: enable: true provider: local local: dir: uploads xmpp: enable: false port: 5222 domain: example.com database: uri: mongodb://localhost/letschat secrets: cookie: secretsauce auth: providers: [local]
We map the volumes and link with the MongoDB container, so letschat can use it for data persistence.
docker run \ --name letschat \ --link chat-mongo:mongo \ -p 8091:8080 -p 5222:5222 \ -v /opt/letschat/config:/usr/src/app/config \ -v /var/opt/letschat/uploads:/usr/src/app/uploads \ --restart=always \ -d sdelements/lets-chat