Deploy a Replica Set

Start each member of the replica set with the appropriate options.使用适当的选项启动复制副本集的每个成员。

For each member, start a mongod instance with the following settings:对于每个成员，使用以下设置启动mongod实例：

• Set replication.replSetName option to the replica set name. 将replication.replSetName选项设置为副本集名称。If your application connects to more than one replica set, each set must have a distinct name.如果应用程序连接到多个副本集，则每个副本集必须具有不同的名称。
• Set net.bindIp option to the hostname/ip or a comma-delimited list of hostnames/ips.将net.bindIp选项设置为主机名/ip或以逗号分隔的主机名/ips列表。
• Set any other settings as appropriate for your deployment.根据部署情况设置任何其他设置。

In this tutorial, the three mongod instances are associated with the following hosts:在本教程中，三个mongod实例与以下主机关联：

The following example specifies the replica set name and the ip binding through the --replSet and --bind_ip command-line options:以下示例通过--replSet和--bind_ip命令行选项指定副本集名称和ip绑定：

mongod --replSet "rs0" --bind_ip localhost,<hostname(s)|ip address(es)>

For <hostname(s)|ip address(es)>, specify the hostname(s) and/or ip address(es) for your mongod instance that remote clients (including the other members of the replica set) can use to connect to the instance.对于<hostname(s)|ip address(es)>，指定远程客户端（包括副本集的其他成员）可以用来连接到实例的mongod实例的主机名和/或ip地址。

Alternatively, you can also specify the replica set name and the ip addresses in a configuration file:或者，您也可以在配置文件中指定副本集名称和ip地址：

replication:
   replSetName: "rs0"
net:
   bindIp: localhost,<hostname(s)|ip address(es)>

To start mongod with a configuration file, specify the configuration file's path with the --config option:要使用配置文件启动mongod，请使用--config选项指定配置文件的路径：

mongod --config <path-to-config>

In production deployments, you can configure a init script to manage this process. 在生产部署中，您可以配置init脚本来管理此过程。Init scripts are beyond the scope of this document.初始化脚本超出了本文档的范围。

Connect mongosh to one of the mongod instances.将mongosh连接到其中一个mongod实例。

From the same machine where one of the mongod is running (in this tutorial, mongodb0.example.net), start mongosh. 从运行其中一个mongod的同一台机器（在本教程中为mongodb0.example.net），启动mongosh。To connect to the mongod listening to localhost on the default port of 27017, simply issue:要在默认端口27017上连接到监听本地主机的mongod，只需发出：

mongo

Depending on your path, you may need to specify the path to the mongosh binary.根据您的路径，您可能需要指定mongosh二进制文件的路径。

Initiate the replica set.启动复制集。

From mongosh, run rs.initiate() on replica set member 0.从mongosh，对副本集成员0运行rs.initiate()。

rs.initiate( {
   _id : "rs0",
   members: [
      { _id: 0, host: "mongodb0.example.net:27017" },
      { _id: 1, host: "mongodb1.example.net:27017" },
      { _id: 2, host: "mongodb2.example.net:27017" }
   ]
})

MongoDB initiates a replica set, using the default replica set configuration.MongoDB使用默认副本集配置启动副本集。

View the replica set configuration.查看副本集配置。

Use rs.conf() to display the replica set configuration object:使用rs.conf()显示副本集配置对象：

rs.conf()

The replica set configuration object resembles the following:副本集配置对象类似于以下内容：

{
   "_id" : "rs0",
   "version" : 1,
   "protocolVersion" : NumberLong(1),
   "members" : [
      {
         "_id" : 0,
         "host" : "mongodb0.example.net:27017",
         "arbiterOnly" : false,
         "buildIndexes" : true,
         "hidden" : false,
         "priority" : 1,
         "tags" : {
         },
         "secondaryDelaySecs" : NumberLong(0),
         "votes" : 1
      },
      {
         "_id" : 1,
         "host" : "mongodb1.example.net:27017",
         "arbiterOnly" : false,
         "buildIndexes" : true,
         "hidden" : false,
         "priority" : 1,
         "tags" : {
         },
         "secondaryDelaySecs" : NumberLong(0),
         "votes" : 1
      },
      {
         "_id" : 2,
         "host" : "mongodb2.example.net:27017",
         "arbiterOnly" : false,
         "buildIndexes" : true,
         "hidden" : false,
         "priority" : 1,
         "tags" : {
         },
         "secondaryDelaySecs" : NumberLong(0),
         "votes" : 1
      }
      
   ],
   "settings" : {
      "chainingAllowed" : true,
      "heartbeatIntervalMillis" : 2000,
      "heartbeatTimeoutSecs" : 10,
      "electionTimeoutMillis" : 10000,
      "catchUpTimeoutMillis" : -1,
      "getLastErrorModes" : {
      },
      "getLastErrorDefaults" : {
         "w" : 1,
         "wtimeout" : 0
      },
      "replicaSetId" : ObjectId("585ab9df685f726db2c6a840")
   }
}

Ensure that the replica set has a primary.确保副本集具有主副本。

Use rs.status() to identify the primary in the replica set.使用rs.status()标识副本集中的主副本。