High Availability

Install Rocket.Chat as HA with mongodb replicaset as backend

Install MongoDB Replicaset

Create rocket.chat docker container

  • Use example docker-compose.yaml in repo

  • Fill the INSTANCE_IP env with the local ip of the docker-host (in a 3 node setup this is unique on every host)

  • Fill the passwords from rocket and oplogger

  • Change the IP of every host in the example docker-compose.yaml -> extra_hosts inserts host entries so each rocketchat-container could resolve the others by the name

  • Be sure that the instances could communicate on port 3000 with each other, this is important to see messages on other hosts directly

rocketchat:
image: rocketchat/rocket.chat:latest
environment:
- PORT=3000
- ROOT_URL=https://chat.domain.de
- MONGO_URL=mongodb://rocket:password@rocket-1:27017,rocket-2:27017,rocket-3:27017/rocketchat?authSource=admin&replicaSet=rs0&w=majority
- MONGO_OPLOG_URL=mongodb://oploguser:password@rocket-1:27017,rocket-2:27017,rocket-3:27017/local?authSource=admin&replicaSet=rs0
- INSTANCE_IP=<ip of the local instance>
ports:
- 3000:3000
extra_hosts:
- "rocket-1:10.250.250.13"
- "rocket-2:10.250.250.14"
- "rocket-3:10.250.250.17"

Create Loadbalancer

  • Now setup up a reverse proxy on each host to terminate ssl on each rocket.chat node or terminate ssl on the loadbalancer, this is up to you.

  • Setup a loadbalancer to reach each instance on 443 or 3000 (depends on the choice above)