Mongoose连接到副本集

Question

我试图通过mongoose连接到MongoDB replicaSet.我用过这个链接.
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,我得到了例外:

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:chat,主服务器:localhost:27022.

此外,我尝试删除另外两个服务器(只保留配置json中的主服务器),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.但是,当我关闭主要的一个,它完成了它的工作(难怪),我需要它,所以它可以使用辅助一个.
有任何想法吗？

Answer 1

我们用这个:

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);

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关闭Auto_reconnect

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包含单个非群集连接(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(也称为复制集)列表时,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
        }
    }
};

此块在localhost和生产环境中都有效.希望能帮助到你.

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:// localhost:27022/chat,localhost:27021,localhost:27020"

您应该检查Mongoose文档中的副本集连接部分.