MongoDB Replica Set

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This service sets up a MongoDB replica set with three members.

Prerequisites

Generate a key file for the replica set:

openssl rand -base64 756 > ./secrets/rs0.key

Initialization

Start the services:
```
docker compose up -d
```

Connect to the primary node:

docker exec -it mongodb-replicaset-mongo1-1 mongosh

Initialize the replica set. Remember to replace the host IP with your actual host IP.

config = {
  _id: "rs0",
  members: [
    {_id: 0, host: "192.168.31.38:27017"},
    {_id: 1, host: "192.168.31.38:27018"},
    {_id: 2, host: "192.168.31.38:27019"},
  ]
}
rs.initiate(config)

Services

mongo1: The first member of the replica set.
mongo2: The second member of the replica set.
mongo3: The third member of the replica set.

Configuration

MONGO_VERSION: The version of the MongoDB image, default is 8.0.13.
MONGO_INITDB_ROOT_USERNAME: The root username for the database, default is root.
MONGO_INITDB_ROOT_PASSWORD: The root password for the database, default is password.
MONGO_INITDB_DATABASE: The initial database to create, default is admin.
MONGO_REPLICA_SET_NAME: The name of the replica set, default is rs0.
MONGO_PORT_OVERRIDE_1: The host port for the first member, default is 27017.
MONGO_PORT_OVERRIDE_2: The host port for the second member, default is 27018.
MONGO_PORT_OVERRIDE_3: The host port for the third member, default is 27019.

Volumes

secrets/rs0.key: The key file for authenticating members of the replica set.