Convert a Standalone Self-Managed mongod to a Replica Set将单机版的自我管理mongod转换为副本集

Shut down the standalone instance.关闭单机版实例。

Use mongosh to connect to your existing mongod instance:使用mongosh连接到现有的mongod实例：

mongosh "mongodb://mongodb0.example.net:27017"

Switch to the admin database and run shutdown.切换到admin数据库并运行shutdown（关机）。

use admin
db.adminCommand(
   {
      shutdown: 1,
      comment: "Convert to cluster"
   }
)

Configure Replica Set Members配置副本集成员

Update the configuration file on each server and to set the replSetName setting更新每台服务器上的配置文件并设置replSetName设置.

replication:
  replSetName: "rs0"

Configure Member Authentication配置成员身份验证

Configure member authentication for each server in the replica set.为副本集中的每台服务器配置成员身份验证。

replication:
  replSetName: "rs0"
security:
  clusterAuthMode: x509
net:
  tls:
    mode: requireTLS
    certificateKeyFile: /etc/mongodb/client.pem
    CAFile: /etc/mongodb/ca.pem
    clusterFile: /etc/mongodb/member.pem

replication:
   replSetName: "rs0"
security:
    keyFile: /etc/mongodb/keyfile

replication:
  replSetName: "rs0"
net:
   bindIp: localhost

Start MongoDB启动MongoDB

Start mongod for each member.为每个成员启动mongod。

Initialize the replica set.初始化副本集。

To initialize the replica set, use mongosh to reconnect to your server instance.要初始化副本集，请使用mongosh重新连接到服务器实例。

mongosh "mongodb://mongodb0.example.net:27017"

Then, run the rs.initiate() method:然后，运行rs.initiate()方法：

rs.initiate()

You only have to initiate the replica set once.您只需启动一次副本集。

To view the replica set configuration, use rs.conf().要查看副本集配置，请使用rs.conf()。

To check the status of the replica set, use rs.status().要检查副本集的状态，请使用rs.status()。

Add nodes to the replica set.将节点添加到副本集中。

The new replica set has a single, primary node. The next step is to add new nodes to the replica set. Review the documentation on clusters before you add additional nodes:新的副本集只有一个主节点。下一步是将新节点添加到副本集中。在添加其他节点之前，请查看有关集群的文档：

• Replica set architectures副本集架构
• Adding members to a replica set向副本集添加成员

To add nodes, run the rs.add() method:要添加节点，请运行rs.add()方法：

rs.add("mongodb1.example.net:27017")
rs.add("mongodb2.example.net:27017")

Check replication status.检查复制状态。

To check that the replica set is correctly configured, run the rs.status() method and check that the new members are listed in the members field:要检查副本集是否配置正确，请运行rs.status()方法，并检查新成员是否列在members字段中：

rs.status()

Update Your Application Connection String.更新应用程序连接字符串。

After you convert the standalone server to a replica set, update the connection string used by your applications to the connection string for your replica set:将独立服务器转换为副本集后，将应用程序使用的连接字符串更新为副本集的连接字符串：

• mongodb0.example.net:27017
• mongodb1.example.net:27017
• mongodb2.example.net:27017

mongodb://mongodb0.example.net:27017,mongodb1.example.net:27017,mongodb2.example.net:27017

Then, restart your applications.然后，重新启动应用程序。