In Docker Configure a replica set for MongoDB

[KiritakeKumi]

https://rocket.chat/docs/installation/manual-installation/mongo-replicas/

Excuse me, how to configure in Docker??

In addition, can you start Rocket without configuring the replica set?

[sshniro]

You can refer this on how to configure a replica set.
https://github.com/RocketChat/Docker.Official.Image/pull/82/files

And Rocket chat has breaking change after version 1.0.
RocketChat/Rocket.Chat#14227

[Rodriq]

Deploying with docker-compose, replica set is specified by setting the MONGO_OPLOG_URL variable see docs https://docs.rocket.chat/quick-start/installing-and-updating/rapid-deployment-methods/docker-and-docker-compose
Creating and configuring replica set is explained here RocketChat/Rocket.Chat#14227