mongodb副本集介紹、mongodb副本集搭建、 mongodb副本集測試

時間  2019-11-05
標籤 mongodb 副本 介紹 搭建 測試 欄目 MongoDB 简体版
原文   原文鏈接

mongodb副本集介紹

  • MongoDB早期版本使用master-slave，一主一從和MySQL主從基本是一致的，但salve在此架構中爲只讀，當主庫宕機後，從庫不能自動切換爲主.
  • 目前已經淘汰master-salve模式，改成副本集，副本集架構也是爲了實現MongoDB的高可用，這種模式下有一個主（primary），和多個從（secondary）只讀，支持他們設置權重，當主宕機後，權重最高的從切換爲主.
  • 在此架構中還能夠創建一個仲裁（arbiter）的角色，它只負責裁決，而不存儲數據.
  • 在此架構中讀寫數據都是在主上，要想實現負載均衡的目的須要手動指定讀庫的目標server.

MongoDB副本集架構圖

原理很簡單一個primary，secondary至少是一個，也能夠是多個secondary，除了多個secondary以外，還能夠加一個Arbiter，Arbiter叫作仲裁，當Primary宕機後，Arbiter能夠很準確的告知Primary宕掉了，但可能Primary認爲本身沒有宕掉，這樣的話就會出現腦裂，爲了防止腦裂就增長了Arbiter這個角色，尤爲是數據庫堅定不能出現腦裂的狀態，腦裂會致使數據會紊亂，數據一旦紊亂恢復就很是麻煩.linux

 

變遷圖

說明：Primary宕機後，其中secondary就成爲一個新的Primary，另一個secondary依然是secondary的角色. 對於MySQL主歷來講，即便作一主多從，萬一master宕機後，可讓從成爲新的主，但這過程是須要手動的更改的. 可是在MongoDB副本集架構當中呢，它徹底都是自動的，rimary宕機後，其中secondary就成爲一個新的Primary，另一個secondary能夠自動識別新的primary.mongodb

 

mongodb副本集搭建

準備三臺機器: 192.168.2.115 (primary)
                      192.168.2.116 (secondary)                    
                      192.168.2.117 (secondary)
三臺機器都須要安裝MongoDB，primary已安裝過，兩臺secondary須要安裝，因步驟同樣，在此不作演示.shell

編輯三臺機器的配置文件

Primary機器:
[root@root-01 ~]# vim /etc/mongod.conf

net:
  port: 27017
  bindIp: 127.0.0.1,192.168.2.115 # Listen to local interface only, comment to listen on all interfaces.

說明:作副本集bindIp 要監聽本機IP和內網IP


#replication:    //把#去掉，並增兩行

replication:
  oplogSizeMB: 20            
  replSetName: annalinux      //定義副本集的名字


重啓MongoDB服務:
[root@root-01 ~]# systemctl restart mongod
[root@root-01 ~]# ps aux |grep mongod
mongod    39020  7.3  4.8 1016828 48880 ?       Sl   17:18   0:00 /usr/bin/mongod -f /etc/mongod.conf
root      39050  0.0  0.0 112664   964 pts/0    S+   17:19   0:00 grep --color=auto mongod


Secondary1機器:
[root@root-02 ~]# vim /etc/mongod.conf

net:
  port: 27017
  bindIp: 127.0.0.1,192.168.2.116 # Listen to local interface only, comment to listen on all interfaces.

說明:作副本集bindIp 要監聽本機IP和內網IP


#replication:    //把#去掉，並增兩行

replication:
  oplogSizeMB: 20            
  replSetName: annalinux      //定義副本集的名字


重啓MongoDB服務:
[root@root-02 ~]# systemctl restart mongod
[root@root-02 ~]# ps aux |grep mongod
mongod     2303  2.2  4.6 1016336 46404 ?       Sl   17:28   0:00 /usr/bin/mongod -f /etc/mongod.conf
root       2331  0.0  0.0 112664   968 pts/0    S+   17:28   0:00 grep --color=auto mongod


Secondary2機器:

[root@root-03 ~]# vim /etc/mongod.conf

net:
  port: 27017
  bindIp: 127.0.0.1,192.168.2.117 # Listen to local interface only, comment to listen on all interfaces.

說明:作副本集bindIp 要監聽本機IP和內網IP


#replication:    //把#去掉，並增兩行

replication:
  oplogSizeMB: 20            
  replSetName: annalinux      //定義副本集的名字

重啓MongoDB服務:
[root@root-03 ~]# systemctl restart mongod
[root@root-03 ~]# ps aux |grep mongod
mongod     2735  3.5  4.3 1016340 43932 ?       Sl   17:46   0:00 /usr/bin/mongod -f /etc/mongod.conf
root       2761  0.0  0.0 112664   968 pts/0    R+   17:47   0:00 grep --color=auto mongod


鏈接MongoDB --Primary機器

[root@root-01 ~]# mongo
MongoDB shell version v3.4.9
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.9
Server has startup warnings: 
2017-10-20T17:18:53.740+0800 I CONTROL  [initandlisten] 
2017-10-20T17:18:53.740+0800 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2017-10-20T17:18:53.740+0800 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2017-10-20T17:18:53.740+0800 I CONTROL  [initandlisten] 
2017-10-20T17:18:53.740+0800 I CONTROL  [initandlisten] 
2017-10-20T17:18:53.740+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2017-10-20T17:18:53.740+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2017-10-20T17:18:53.740+0800 I CONTROL  [initandlisten] 
2017-10-20T17:18:53.740+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2017-10-20T17:18:53.740+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2017-10-20T17:18:53.740+0800 I CONTROL  [initandlisten]

配置副本集

說明:在哪臺機器上執行這一步，那麼哪臺機器就會成爲primary數據庫

> config={_id:"annalinux",members:[{_id:0,host:"192.168.2.115:27017"},{_id:1,host:"192.168.2.116:27017"},{_id:2,host:"192.168.2.117:27017"}]}
{
	"_id" : "annalinux",
	"members" : [
		{
			"_id" : 0,
			"host" : "192.168.2.115:27017"
		},
		{
			"_id" : 1,
			"host" : "192.168.2.116:27017"
		},
		{
			"_id" : 2,
			"host" : "192.168.2.117:27017"
		}
	]
}

config={_id:"annalinux" --> annalinux(副本集的名字)
members --> 指定成員

rs.initiate(config) -->初始化 

> rs.initiate(config)
{ "ok" : 1 }

rs.status() -->查看副本集狀態

說明：能夠看到192.168.2.115 顯示："stateStr" : "PRIMARY"
          192.168.2.116和192.168.2.117 分別顯示： "stateStr" : "SECONDARY"vim

annalinux:SECONDARY> rs.status()
{
	"set" : "annalinux",
	"date" : ISODate("2017-10-20T10:02:15.484Z"),
	"myState" : 1,
	"term" : NumberLong(1),
	"heartbeatIntervalMillis" : NumberLong(2000),
	"optimes" : {
		"lastCommittedOpTime" : {
			"ts" : Timestamp(1508493732, 1),
			"t" : NumberLong(1)
		},
		"appliedOpTime" : {
			"ts" : Timestamp(1508493732, 1),
			"t" : NumberLong(1)
		},
		"durableOpTime" : {
			"ts" : Timestamp(1508493732, 1),
			"t" : NumberLong(1)
		}
	},
	"members" : [
		{
			"_id" : 0,
			"name" : "192.168.2.115:27017",
			"health" : 1,
			"state" : 1,
			"stateStr" : "PRIMARY",
			"uptime" : 2602,
			"optime" : {
				"ts" : Timestamp(1508493732, 1),
				"t" : NumberLong(1)
			},
			"optimeDate" : ISODate("2017-10-20T10:02:12Z"),
			"infoMessage" : "could not find member to sync from",
			"electionTime" : Timestamp(1508493631, 1),
			"electionDate" : ISODate("2017-10-20T10:00:31Z"),
			"configVersion" : 1,
			"self" : true
		},
		{
			"_id" : 1,
			"name" : "192.168.2.116:27017",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 115,
			"optime" : {
				"ts" : Timestamp(1508493732, 1),
				"t" : NumberLong(1)
			},
			"optimeDurable" : {
				"ts" : Timestamp(1508493732, 1),
				"t" : NumberLong(1)
			},
			"optimeDate" : ISODate("2017-10-20T10:02:12Z"),
			"optimeDurableDate" : ISODate("2017-10-20T10:02:12Z"),
			"lastHeartbeat" : ISODate("2017-10-20T10:02:13.519Z"),
			"lastHeartbeatRecv" : ISODate("2017-10-20T10:02:13.875Z"),
			"pingMs" : NumberLong(0),
			"syncingTo" : "192.168.2.117:27017",
			"configVersion" : 1
		},
		{
			"_id" : 2,
			"name" : "192.168.2.117:27017",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 115,
			"optime" : {
				"ts" : Timestamp(1508493732, 1),
				"t" : NumberLong(1)
			},
			"optimeDurable" : {
				"ts" : Timestamp(1508493732, 1),
				"t" : NumberLong(1)
			},
			"optimeDate" : ISODate("2017-10-20T10:02:12Z"),
			"optimeDurableDate" : ISODate("2017-10-20T10:02:12Z"),
			"lastHeartbeat" : ISODate("2017-10-20T10:02:13.519Z"),
			"lastHeartbeatRecv" : ISODate("2017-10-20T10:02:13.881Z"),
			"pingMs" : NumberLong(0),
			"syncingTo" : "192.168.2.115:27017",
			"configVersion" : 1
		}
	],
	"ok" : 1
}
annalinux:PRIMARY>

 

mongodb副本集測試

建立庫 和 建立集合-->在primary機器

切換到admin庫:
annalinux:PRIMARY> use admin
switched to db admin

建立mydb庫:
annalinux:PRIMARY> use mydb
switched to db mydb

建立acc集合，並插入一些數據:
annalinux:PRIMARY> db.acc.insert({AccountID:1,USerName:"123",password:"123456"})
WriteResult({ "nInserted" : 1 })

查看全部庫:
annalinux:PRIMARY> show dbs
admin  0.000GB
db1    0.000GB
local  0.000GB
mydb   0.000GB
test   0.000GB


切換到mydb庫：
annalinux:PRIMARY> show dbs
admin  0.000GB
db1    0.000GB
local  0.000GB
mydb   0.000GB
test   0.000GB

進入mydb庫:
annalinux:PRIMARY> use mydb
switched to db mydb

查看集合：
annalinux:PRIMARY> show tables
acc


登陸Secondary1機器

說明: 和primary機器數據一致，說明搭建副本集成功了bash

登陸：
[root@root-02 ~]# mongo
MongoDB shell version v3.4.9
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.9
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
	http://docs.mongodb.org/
Questions? Try the support group
	http://groups.google.com/group/mongodb-user
Server has startup warnings: 
2017-10-20T17:28:02.614+0800 I CONTROL  [initandlisten] 
2017-10-20T17:28:02.614+0800 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2017-10-20T17:28:02.614+0800 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2017-10-20T17:28:02.614+0800 I CONTROL  [initandlisten] 
2017-10-20T17:28:02.614+0800 I CONTROL  [initandlisten] 
2017-10-20T17:28:02.614+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2017-10-20T17:28:02.614+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2017-10-20T17:28:02.614+0800 I CONTROL  [initandlisten] 
2017-10-20T17:28:02.614+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2017-10-20T17:28:02.614+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2017-10-20T17:28:02.614+0800 I CONTROL  [initandlisten] 

查看全部庫：
annalinux:SECONDARY> show dbs;
2017-10-20T18:18:50.600+0800 E QUERY    [thread1] Error: listDatabases failed:{
	"ok" : 0,
	"errmsg" : "not master and slaveOk=false",       //提示不是master，slaveOK=false
	"code" : 13435, 
	"codeName" : "NotMasterNoSlaveOk"
} :
_getErrorWithCode@src/mongo/shell/utils.js:25:13
Mongo.prototype.getDBs@src/mongo/shell/mongo.js:62:1
shellHelper.show@src/mongo/shell/utils.js:769:19
shellHelper@src/mongo/shell/utils.js:659:15
@(shellhelp2):1:1

須要執行:
annalinux:SECONDARY> rs.slaveOk()


再show dbs就沒問題:
annalinux:SECONDARY> show dbs;
admin  0.000GB
db1    0.000GB
local  0.000GB
mydb   0.000GB
test   0.000GB

進入mydb庫:
annalinux:SECONDARY> use mydb
switched to db mydb

查看集合:
annalinux:SECONDARY> show tables
acc


 登陸Secondary2機器

說明: 和primary機器數據一致，說明搭建副本集成功了架構

[root@root-03 ~]# mongo
MongoDB shell version v3.4.9
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.9
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
	http://docs.mongodb.org/
Questions? Try the support group
	http://groups.google.com/group/mongodb-user
Server has startup warnings: 
2017-10-20T17:46:53.757+0800 I CONTROL  [initandlisten] 
2017-10-20T17:46:53.757+0800 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2017-10-20T17:46:53.757+0800 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2017-10-20T17:46:53.757+0800 I CONTROL  [initandlisten] 
2017-10-20T17:46:53.757+0800 I CONTROL  [initandlisten] 
2017-10-20T17:46:53.757+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2017-10-20T17:46:53.757+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2017-10-20T17:46:53.757+0800 I CONTROL  [initandlisten] 
2017-10-20T17:46:53.757+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2017-10-20T17:46:53.758+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2017-10-20T17:46:53.758+0800 I CONTROL  [initandlisten] 

查看全部庫：
annalinux:SECONDARY> show dbs;
2017-10-20T18:18:50.600+0800 E QUERY    [thread1] Error: listDatabases failed:{
	"ok" : 0,
	"errmsg" : "not master and slaveOk=false",       //提示不是master，slaveOK=false
	"code" : 13435, 
	"codeName" : "NotMasterNoSlaveOk"
} :
_getErrorWithCode@src/mongo/shell/utils.js:25:13
Mongo.prototype.getDBs@src/mongo/shell/mongo.js:62:1
shellHelper.show@src/mongo/shell/utils.js:769:19
shellHelper@src/mongo/shell/utils.js:659:15
@(shellhelp2):1:1

須要執行:
annalinux:SECONDARY> rs.slaveOk()


再show dbs就沒問題:
annalinux:SECONDARY> show dbs;
admin  0.000GB
db1    0.000GB
local  0.000GB
mydb   0.000GB
test   0.000GB

進入mydb庫:
annalinux:SECONDARY> use mydb
switched to db mydb

查看集合:
annalinux:SECONDARY> show tables
acc


副本集更改權重模擬primary宕機

說明：在primary機器添加防火牆規則，僞裝primary宕機，看看是如何變成一個新的primary。app

rs.config() -->查看權重

說明:能夠看到三個節點都是"priority" : 1, 也就是說三個節點權重都是同樣負載均衡

annalinux:PRIMARY> rs.config()
{
	"_id" : "annalinux",
	"version" : 1,
	"protocolVersion" : NumberLong(1),
	"members" : [
		{
			"_id" : 0,
			"host" : "192.168.2.115:27017",
			"arbiterOnly" : false,
			"buildIndexes" : true,
			"hidden" : false,
			"priority" : 1,
			"tags" : {
				
			},
			"slaveDelay" : NumberLong(0),
			"votes" : 1
		},
		{
			"_id" : 1,
			"host" : "192.168.2.116:27017",
			"arbiterOnly" : false,
			"buildIndexes" : true,
			"hidden" : false,
			"priority" : 1,
			"tags" : {
				
			},
			"slaveDelay" : NumberLong(0),
			"votes" : 1
		},
		{
			"_id" : 2,
			"host" : "192.168.2.117:27017",
			"arbiterOnly" : false,
			"buildIndexes" : true,
			"hidden" : false,
			"priority" : 1,
			"tags" : {
				
			},
			"slaveDelay" : NumberLong(0),
			"votes" : 1
		}
	],
	"settings" : {
		"chainingAllowed" : true,
		"heartbeatIntervalMillis" : 2000,
		"heartbeatTimeoutSecs" : 10,
		"electionTimeoutMillis" : 10000,
		"catchUpTimeoutMillis" : 60000,
		"getLastErrorModes" : {
			
		},
		"getLastErrorDefaults" : {
			"w" : 1,
			"wtimeout" : 0
		},
		"replicaSetId" : ObjectId("59e9c9342025e71e7bcebc7b")
	}
}

在primary機器加一條iptables規則，把27017端口禁掉 

[root@root-01 ~]# iptables -I INPUT -p tcp --dport 27017 -j DROP


查看副本集狀態--在Secondary1機器 

說明: 本來192.168.2.115是primary，如今192.168.2.117變成了primarytcp

查看副本集狀態：
annalinux:SECONDARY> rs.status()
{
	"set" : "annalinux",
	"date" : ISODate("2017-10-20T10:40:27.907Z"),
	"myState" : 2,
	"term" : NumberLong(2),
	"syncingTo" : "192.168.2.117:27017",
	"heartbeatIntervalMillis" : NumberLong(2000),
	"optimes" : {
		"lastCommittedOpTime" : {
			"ts" : Timestamp(1508496022, 1),
			"t" : NumberLong(2)
		},
		"appliedOpTime" : {
			"ts" : Timestamp(1508496022, 1),
			"t" : NumberLong(2)
		},
		"durableOpTime" : {
			"ts" : Timestamp(1508496022, 1),
			"t" : NumberLong(2)
		}
	},
	"members" : [
		{
			"_id" : 0,
			"name" : "192.168.2.115:27017",
			"health" : 0,
			"state" : 8,
			"stateStr" : "(not reachable/healthy)",          //顯示不能獲取狀態值
			"uptime" : 0,
			"optime" : {
				"ts" : Timestamp(0, 0),
				"t" : NumberLong(-1)
			},
			"optimeDurable" : {
				"ts" : Timestamp(0, 0),
				"t" : NumberLong(-1)
			},
			"optimeDate" : ISODate("1970-01-01T00:00:00Z"),
			"optimeDurableDate" : ISODate("1970-01-01T00:00:00Z"),
			"lastHeartbeat" : ISODate("2017-10-20T10:40:26.805Z"),
			"lastHeartbeatRecv" : ISODate("2017-10-20T10:40:27.796Z"),
			"pingMs" : NumberLong(0),
			"lastHeartbeatMessage" : "Couldn't get a connection within the time limit",
			"configVersion" : -1
		},
		{
			"_id" : 1,
			"name" : "192.168.2.116:27017",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 4345,
			"optime" : {
				"ts" : Timestamp(1508496022, 1),
				"t" : NumberLong(2)
			},
			"optimeDate" : ISODate("2017-10-20T10:40:22Z"),
			"syncingTo" : "192.168.2.117:27017",
			"configVersion" : 1,
			"self" : true
		},
		{
			"_id" : 2,
			"name" : "192.168.2.117:27017",
			"health" : 1,
			"state" : 1,
			"stateStr" : "PRIMARY",
			"uptime" : 2405,
			"optime" : {
				"ts" : Timestamp(1508496022, 1),
				"t" : NumberLong(2)
			},
			"optimeDurable" : {
				"ts" : Timestamp(1508496022, 1),
				"t" : NumberLong(2)
			},
			"optimeDate" : ISODate("2017-10-20T10:40:22Z"),
			"optimeDurableDate" : ISODate("2017-10-20T10:40:22Z"),
			"lastHeartbeat" : ISODate("2017-10-20T10:40:26.709Z"),
			"lastHeartbeatRecv" : ISODate("2017-10-20T10:40:26.089Z"),
			"pingMs" : NumberLong(0),
			"electionTime" : Timestamp(1508495934, 1),
			"electionDate" : ISODate("2017-10-20T10:38:54Z"),
			"configVersion" : 1
		}
	],
	"ok" : 1
}

把原來的primary機器設置的iptables規則刪除掉

說明:把在原來的primary機器設置的iptables規則刪除掉，它也不能變會primary，除非設置了權重

[root@root-01 ~]# iptables -D INPUT -p tcp --dport 27017 -j DROP


在新的primary機器（192.168.2.117）設置權重

設置變量:
annalinux:PRIMARY> cfg=rs.config()
{
	"_id" : "annalinux",
	"version" : 1,
	"protocolVersion" : NumberLong(1),
	"members" : [
		{
			"_id" : 0,
			"host" : "192.168.2.115:27017",
			"arbiterOnly" : false,
			"buildIndexes" : true,
			"hidden" : false,
			"priority" : 1,
			"tags" : {
				
			},
			"slaveDelay" : NumberLong(0),
			"votes" : 1
		},
		{
			"_id" : 1,
			"host" : "192.168.2.116:27017",
			"arbiterOnly" : false,
			"buildIndexes" : true,
			"hidden" : false,
			"priority" : 1,
			"tags" : {
				
			},
			"slaveDelay" : NumberLong(0),
			"votes" : 1
		},
		{
			"_id" : 2,
			"host" : "192.168.2.117:27017",
			"arbiterOnly" : false,
			"buildIndexes" : true,
			"hidden" : false,
			"priority" : 1,
			"tags" : {
				
			},
			"slaveDelay" : NumberLong(0),
			"votes" : 1
		}
	],
	"settings" : {
		"chainingAllowed" : true,
		"heartbeatIntervalMillis" : 2000,
		"heartbeatTimeoutSecs" : 10,
		"electionTimeoutMillis" : 10000,
		"catchUpTimeoutMillis" : 60000,
		"getLastErrorModes" : {
			
		},
		"getLastErrorDefaults" : {
			"w" : 1,
			"wtimeout" : 0
		},
		"replicaSetId" : ObjectId("59e9c9342025e71e7bcebc7b")
	}
}

設置權重:
annalinux:PRIMARY> cfg.members[0].priority=3
3
annalinux:PRIMARY> cfg.members[1].priority=2
2
annalinux:PRIMARY> cfg.members[2].priority=1
1


讓設置的權重生效:
annalinux:PRIMARY> rs.reconfig(cfg)
{ "ok" : 1 }


查看權重:
annalinux:PRIMARY> rs.config()
2017-10-20T18:54:07.529+0800 E QUERY    [thread1] Error: error doing query: failed: network error while attempting to run command 'replSetGetConfig' on host '127.0.0.1:27017'  :
DB.prototype.runCommand@src/mongo/shell/db.js:132:1
DB.prototype.adminCommand@src/mongo/shell/db.js:150:16
rs.conf@src/mongo/shell/utils.js:1271:16
@(shell):1:1
2017-10-20T18:54:07.533+0800 I NETWORK  [thread1] trying reconnect to 127.0.0.1:27017 (127.0.0.1) failed
2017-10-20T18:54:07.534+0800 I NETWORK  [thread1] reconnect 127.0.0.1:27017 (127.0.0.1) ok
annalinux:SECONDARY> 

說明: 提示這臺機器不是primary,已經發生了改變，這臺機器變成了Secondary了



從新執行rs.config()：
annalinux:SECONDARY> rs.config()
{
	"_id" : "annalinux",
	"version" : 2,
	"protocolVersion" : NumberLong(1),
	"members" : [
		{
			"_id" : 0,
			"host" : "192.168.2.115:27017",
			"arbiterOnly" : false,
			"buildIndexes" : true,
			"hidden" : false,
			"priority" : 3,
			"tags" : {
				
			},
			"slaveDelay" : NumberLong(0),
			"votes" : 1
		},
		{
			"_id" : 1,
			"host" : "192.168.2.116:27017",
			"arbiterOnly" : false,
			"buildIndexes" : true,
			"hidden" : false,
			"priority" : 2,
			"tags" : {
				
			},
			"slaveDelay" : NumberLong(0),
			"votes" : 1
		},
		{
			"_id" : 2,
			"host" : "192.168.2.117:27017",
			"arbiterOnly" : false,
			"buildIndexes" : true,
			"hidden" : false,
			"priority" : 1,
			"tags" : {
				
			},
			"slaveDelay" : NumberLong(0),
			"votes" : 1
		}
	],
	"settings" : {
		"chainingAllowed" : true,
		"heartbeatIntervalMillis" : 2000,
		"heartbeatTimeoutSecs" : 10,
		"electionTimeoutMillis" : 10000,
		"catchUpTimeoutMillis" : 60000,
		"getLastErrorModes" : {
			
		},
		"getLastErrorDefaults" : {
			"w" : 1,
			"wtimeout" : 0
		},
		"replicaSetId" : ObjectId("59e9c9342025e71e7bcebc7b")
	}
}

說明:能夠看到192.168.2.115的權重顯示: "priority" : 3
            192.168.2.116的權重顯示: "priority" : 2
            192.168.2.117的權重顯示: "priority" : 1
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