Mongoose 连接到副本集

Question

我尝试通过 mongoose 连接到 MongoDB 副本集。我用过这个link。
配置json：

"mongoose": {
   "uri": "mongodb://localhost:27022/chat,localhost:27021,localhost:27020",
   "options": {
       "replset": { "rs_name": "rs0" },
       "server": {
           "poolSize": 3,
           "socketOptions": {
               "keepAlive": 1
           }
       }
    }
}

猫鼬连接：

var mongoose = require('mongoose');
mongoose.connect(config.get('mongoose:uri'), config.get('mongoose:options'));

启动应用程序后出现异常：

Error: host must be specified [undefined]
at new exports.ConnectionPool (c:\Users\lor1an\Downloads\prj_chat-master\prj_chat-master\node_modules\mongodb\lib\mongodb\connection\connection_pool.js:18:11)
at Server.connect (c:\Users\lor1an\Downloads\prj_chat-master\prj_chat-master\node_modules\mongodb\lib\mongodb\connection\server.js:335:25)
at Db.open (c:\Users\lor1an\Downloads\prj_chat-master\prj_chat-master\node_modules\mongodb\lib\mongodb\db.js:264:23)
at MongoStore._open_database (c:\Users\lor1an\Downloads\prj_chat-master\prj_chat-master\node_modules\connect-mongo\lib\connect-mongo.js:174:15)
at MongoStore._get_collection (c:\Users\lor1an\Downloads\prj_chat-master\prj_chat-master\node_modules\connect-mongo\lib\connect-mongo.js:169:14)
at MongoStore.get (c:\Users\lor1an\Downloads\prj_chat-master\prj_chat-master\node_modules\connect-mongo\lib\connect-mongo.js:213:10)
at Object.session [as handle] (c:\Users\lor1an\Downloads\prj_chat-master\prj_chat-master\node_modules\connect\node_modules\express-session\index.js:215:11)
at next (c:\Users\lor1an\Downloads\prj_chat-master\prj_chat-master\node_modules\connect\lib\proto.js:194:15)
at Object.module.exports [as handle] (c:\Users\lor1an\Downloads\prj_chat-master\prj_chat-master\middleware\resExtensions.js:21:2)
at next (c:\Users\lor1an\Downloads\prj_chat-master\prj_chat-master\node_modules\connect\lib\proto.js:194:15)

Db：聊天，主服务器：localhost:27022。

我还尝试删除其他两台服务器（仅在配置 json 中保留主要服务器），我看到它知道辅助服务器（我使用了日志）。我认为这是关于 mongodb 元数据的。但是当我关闭主设备时，它完成了它的工作（难怪），我需要它以便它可以使用辅助设备。
有什么想法吗？

Answer 1

我们使用这个：

if(config.db.indexOf('replicaSet') > - 1) {
  dbOptions = {
    db: {native_parser: true},
    replset: {
      auto_reconnect:false,
      poolSize: 10,
      socketOptions: {
        keepAlive: 1000,
        connectTimeoutMS: 30000
      }
    },
    server: {
      poolSize: 5,
      socketOptions: {
        keepAlive: 1000,
        connectTimeoutMS: 30000
      }
    }
  };
}

var db = mongoose.connect(config.db, dbOptions);

在哪里

config.db =  'mongodb://USER:PW@host1:port1,host2:port2/DBNAME?replicaSet=RSNAME'

根据https://team.goodeggs.com/reconnecting-to-mongodb-when-mongoose-connect-fails-at-startup-83ca8496ca02，Auto_reconnect 已关闭

Answer 2

我也遇到了麻烦。我从这次经历中学到的是：

仅当连接 URI 包含单个非集群连接（也称为单个连接字符串）时才会调用“服务器”块。

仅当连接 URL 包含逗号分隔的连接字符串列表（也称为复制集）时，才会调用“replset”块。

var options = {

    db: {
        native_parser: true
    },

    // This block gets run for a non replica set connection string (eg. localhost with a single DB)
    server: {
        poolSize: 5,
        reconnectTries: Number.MAX_VALUE,
        ssl: false,
        sslValidate: false,
        socketOptions: {
            keepAlive: 1000,
            connectTimeoutMS: 30000
        }
    },

    // This block gets run when the connection string indicates a replica set (comma seperated connections)
    replset: {
        auto_reconnect: false,
        poolSize: 10,
        connectWithNoPrimary: true,
        ssl: true,
        sslValidate: false,
        socketOptions: {
            keepAlive: 1000,
            connectTimeoutMS: 30000
        }
    }
};

这个块在本地主机和生产环境上都有效。 希望对您有所帮助。

Answer 3

您的连接字符串可能无效。您应该为每个副本集成员提供 URI：

"uri": "mongodb://db0.example.com:27017,db1.example.com:27017,db2.example.com:27017/admin?replicaSet=myRepl"

您应该查看 Mongoose 文档中的 replica set connection 部分。

Answer 4

# mongoose connect secondary replicateSet

<pre>
let url = 'mongodb://mongo01:1001,mongo02:1002/db_name?replicaSet=xxx-replica' 
// 1 

let conn = mongoose.createConnection(url, {user:'xxx', pass:'xxx', autoIndex: false, replset: {readPreference: 'secondary'}});

// 2  

let conn = mongoose.createConnection(url, {user:'xxx', pass:'xxx', autoIndex: false});
let schema =  new mongoose.Schema({},{read:'secondary'});
let model = conn.model(modelName, schema);

//3
let conn = mongoose.createConnection(url, {user:'xxx', pass:'xxx', autoIndex: false};
let schema = new mongoose.Schema({});
let model = conn.model(modelName, schema);
model.find().read('secondary').then(info => {});

</pre>