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MongoDB Local ReplicaSet

Sometimes you need a replica set in your local environment (perhaps you want to use the oplog). But it's somewhat involved to spin up a series of mongo containers and provide the correct configuration. This docker image will create a self-contained 3 node replica set (that is, all three nodes are running in one container).

THIS IS ONLY USEFUL FOR LOCAL DEVELOPMENT

Using

You need to know the following:

PORTS

Each instance exposes a port, all listening on 0.0.0.0 interface:

  • db1: 27001 [primary]
  • db2: 27002
  • db3: 27003

DATA

The container will create one volume at /data, but you can mount one or more to your host at these paths:

  • db1: /data/db1 [primary]
  • db2: /data/db2
  • db3: /data/db3

REPLICA SET NAME

You can customize the replica set name by providing REPLICA_SET_NAME environment variable. default name is: rs0

Notes

If you mount something into /data/db1, the container will not go through it's initialization process, but it will also assume that you have mounted all 3 volumes -- so mount all 3 or none. You can customize the username/password by providing USERNAME/PASSWORD environment variables (but you probably don't need to).

Example Run

docker run -d -p 27001:27001 -p 27002:27002 -p 27003:27003 --name mongo -v /data/mongodb:/data -e "REPLICA_SET_NAME=mongo-rs" --restart=always flqw/docker-mongo-local-replicaset

Example Mongo Connection String (from another container)

mongodb://dev:dev@mongo:27001,mongo:27002,mongo:27003/db