Convert MongoDB Single Node to Replica Set

Based on the HAP system architecture, a MongoDB single node involves either built-in MongoDB using a storage component mirror or single-deployed MongoDB. It also needs to consider whether authentication is enabled. In summary, there are the following 4 cases:

• Built-in MongoDB with authentication disabled
• Built-in MongoDB with authentication enabled
• External MongoDB with authentication disabled
• External MongoDB with authentication enabled

Built-in MongoDB with authentication disabled

Built-in MongoDB refers to the MongoDB component included in the mingdaoyun-sc:3.0.0 mirror.

1. Add ENV_MONGODB_DAEMON_ARGS: "--replSet sc-mongodb" in the docker-compose.yaml file as follows:

   After adding ENV_MONGODB_DAEMON_ARGS, it will automatically convert to replica set mode. The built-in script is: rs.initiate({_id: "sc-mongodb",members:[ {_id : 1, host : "sc:27017"} ]}) (If there are other clients connecting to this MongoDB, you need to add a host resolution record for the sc service name on the client.)

   services:
     app:
       image: registry.cn-hangzhou.aliyuncs.com/mdpublic/mingdaoyun-community:5.8.1
       environment: &app-environment
         ENV_MONGODB_DAEMON_ARGS: "--replSet sc-mongodb"

2. Restart the service and execute the following in the root directory of the manager:

   bash ./service.sh restartall

Built-in MongoDB with authentication enabled

Built-in MongoDB refers to the MongoDB component included in the mingdaoyun-sc:3.0.0 mirror.

1. Create a keyfile

   echo $(openssl rand -base64 32) > /data/mingdao/script/volume/data/mongodb/keyfile
   chmod 400 /data/mingdao/script/volume/data/mongodb/keyfile

2. Modify the environment variable ENV_MONGODB_DAEMON_ARGS, and add --keyFile /data/mongodb/keyfile --replSet sc-mongodb

    services:
      app:
        image: registry.cn-hangzhou.aliyuncs.com/mdpublic/mingdaoyun-community:5.8.1
        environment: &app-environment
          ENV_MONGODB_DAEMON_ARGS: "--auth --keyFile /data/mongodb/keyfile --replSet sc-mongodb"

3. Restart the service and execute the following in the root directory of the manager:

   bash ./service.sh restartall

4. Replica set conversion

   Access the storage component container:

   docker exec -it script_sc_1 bash

   Connect to the admin database using the root account

   mongo mongodb://root:******@sc:27017/admin

   Initialize the replica set (If there are other clients connecting to this MongoDB, you need to add a host resolution record for the sc service name on the client.)

   rs.initiate({_id: "sc-mongodb",members:[ {_id : 1, host : "sc:27017"} ]})

5. Restart the service again, and execute the following in the root directory of the manager:

   bash ./service.sh restartall

External MongoDB with authentication disabled

1. Restart MongoDB, and append --replSet sc-mongodb to the start command, like:

   mongod --bind_ip 0.0.0.0 --dbpath /data/mongodb --logpath /data/logs/mongodb.log --replSet sc-mongodb

2. Connect to MongoDB and convert it to a replica set

   Connect to the admin database

   mongo mongodb://sc:27017/admin

   Initialize the replica set (If there are clients connecting to this MongoDB that cannot communicate with the IP address directly, you can configure a service name instead. However, all clients will need to add a host resolution record for the sc service name.)

   rs.initiate({_id:"sc-mongodb",members:[{_id:1,host:"service name or IP:27017"}]})

3. Restart the service and execute the following in the root directory of the manager:

   bash ./service.sh restartall

External MongoDB with authentication enabled

1. Create a keyfile file in the MongoDB data directory (e.g., /data/mongodb/)

   echo $(openssl rand -base64 32) > /data/mongodb/keyfile
   chmod 400 /data/mongodb/keyfile

2. Restart MongoDB, and append --keyFile /data/mongodb/keyfile --replSet sc-mongodb to the start command, like:

   mongod --bind_ip 0.0.0.0 --dbpath /data/mongodb --logpath /data/logs/mongodb.log --auth --keyFile /data/mongodb/keyfile --replSet sc-mongodb 

3. Connect to MongoDB and convert it to a replica set

   Connect to the admin database with root account

   mongo mongodb://root:******@sc:27017/admin

   Initialize the replica set (If there are clients connecting to this MongoDB that cannot communicate with the IP address directly, you can configure a service name instead. However, all clients will need to add a host resolution record for the sc service name.)

   rs.initiate({_id:"sc-mongodb",members:[{_id:1,host:"service name or IP:27017"}]})

4. Restart the service and execute the following in the root directory of the manager:

   bash ./service.sh restartall