Running Docker, the unit price of MongoDB is enabled in Replicate Set mode.

Mar 18, 202344

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There is a MongoDB running on a single machine in a Docker container. The task is to enable the oplog by starting the replica set mode. The steps involved are: 1. Stop the MongoDB server and backup the data directory. 2. Modify the docker-compose file to include the `--replSet rs` parameter and specify the location of the configuration file. 3. Configure the mongod.conf file to specify the data and keyfile locations. 4. Generate the mongo.keyfile using the openssl tool, set permissions, and ownership. 5. Start the MongoDB server and initialize the replica set by entering the client in the mongo container and running the `rs.initiate` command.

There is an existing standalone MongoDB running in Docker, and now it needs to read its oplog, so the replSet mode needs to be enabled.

1. Shutdown#

Copy the data directory for backup.

2. Modify the docker-compose file#

 mongodb:
    command: mongod --replSet rs -f /etc/mongod.conf
    volumes:
        - ./mongod.conf:/etc/mongod.conf
        - ./mongo.keyfile:/etc/mongo.keyfile

Add --replSet rs and -f parameters to specify the running mode as rs and the location of the configuration file.
Specify the locations of the configuration file and key file.

3. mongod.conf configuration file#

The file specifies the data location and key file location.

storage:
  dbPath: /data/db
  journal:
    enabled: true
processManagement:
  timeZoneInfo: /usr/share/zoneinfo

security:
  authorization: enabled
  keyFile: /etc/mongo.keyfile

4. mongo.keyfile#

The content of the key file can be generated using the openssl tool.

openssl rand -base64 756 > mongo.keyfile

Set permissions:

chmod 400 mongo.keyfile

Set user:

chown 999:999 mongo.keyfile

Otherwise, permission errors such as "permission too open" will occur and MongoDB will not start.

5. Start MongoDB#

Enter the client of the MongoDB container.

rs.initiate({ _id: "rs", members: [{_id:0,host:"ip:port"}]}

Initialize.