MongoDB笔记 -- ReplicationSet复制集

最新推荐文章于 2025-02-25 20:06:59 发布

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最新推荐文章于 2025-02-25 20:06:59 发布

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本文链接：https://blog.youkuaiyun.com/weixin_42480750/article/details/108909237

本文详细介绍了一个MongoDB集群的搭建过程，包括环境配置、各节点角色定义、配置文件修改及服务启动等步骤，并演示了主从切换及数据读写操作。

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环境初定

在这里插入图片描述

MongoDB安装过程参考：https://blog.youkuaiyun.com/weixin_42480750/article/details/108902137

MongoDB自动安装脚本：https://blog.youkuaiyun.com/weixin_42480750/article/details/108908684

功用	IP	HOST
Replica Set Primary	13.13.5.5/16	mongo01
Replica Set Secondary	13.13.6.6/16	mongo02
Replica Set Secondary	13.13.7.7/16	mongo03

搭建过程

设定/etc/hosts(all)

[root@mongo01 ~]# vi /etc/hosts
[root@mongo01 ~]# tail -3 /etc/hosts
13.13.5.5 mongo01
13.13.6.6 mongo02
13.13.7.7 mongo03
[root@mongo01 ~]#

设定/etc/mongod.conf(all)

[root@mongo01 ~]# cp /etc/mongod.conf{,.bak}
[root@mongo01 ~]# vi /etc/mongod.conf 
[root@mongo01 ~]# cat /etc/mongod.conf 
systemLog:
  destination: file
  logAppend: true
  path: /var/log/mongodb/mongod.log

storage:
  dbPath: /var/lib/mongo
  journal:
    enabled: true

processManagement:
  fork: true  # fork and run in background
  pidFilePath: /var/run/mongodb/mongod.pid  # location of pidfile
  timeZoneInfo: /usr/share/zoneinfo

net:
  port: 27017
  bindIp: 127.0.0.1,mongo01

replication:
  replSetName: "rs0"
[root@mongo01 ~]#

[root@mongo02 ~]# cat /etc/mongod.conf
....
  bindIp: 127.0.0.1,mongo02
....
[root@mongo02 ~]#

[root@mongo03 ~]# cat /etc/mongod.conf
....
  bindIp: 127.0.0.1,mongo03
....
[root@mongo03 ~]#

设定防火墙(all)

[root@mongo01 ~]# firewall-cmd --permanent --add-service=mongodb
success
[root@mongo01 ~]# firewall-cmd --reload
success
[root@mongo01 ~]# systemctl restart mongod.service
[root@mongo01 ~]#

初始化RS(mongo01)

[root@mongo01 ~]# mongo
> rs.initiate( {
...    _id : "rs0",
...    members: [
...       { _id: 0, host: "mongo01" },
...       { _id: 1, host: "mongo02" },
...       { _id: 2, host: "mongo03" }
...    ]
... })
{
	"ok" : 1,
	"$clusterTime" : {
		"clusterTime" : Timestamp(1601699100, 1),
		"signature" : {
			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
			"keyId" : NumberLong(0)
		}
	},
	"operationTime" : Timestamp(1601699100, 1)
}
rs0:SECONDARY> 
rs0:PRIMARY> 
rs0:PRIMARY>

经历了短暂的选举过程后，mongo01当选主节点

[root@mongo02 ~]# mongo
rs0:SECONDARY>

[root@mongo03 ~]# mongo
rs0:SECONDARY>

rs0:PRIMARY> rs.status()
{
	"set" : "rs0",
	"date" : ISODate("2020-10-03T04:27:08.038Z"),
	"myState" : 1,
....
	"members" : [
		{
			"_id" : 0,
			"name" : "mongo01:27017",
			"health" : 1,
			"state" : 1,
			"stateStr" : "PRIMARY",
			"uptime" : 171,
			"optime" : {
				"ts" : Timestamp(1601699221, 1),
				"t" : NumberLong(1)
			},
....
		{
			"_id" : 1,
			"name" : "mongo02:27017",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 127,
			"optime" : {
				"ts" : Timestamp(1601699221, 1),
				"t" : NumberLong(1)
			},
....
		{
			"_id" : 2,
			"name" : "mongo03:27017",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 127,
			"optime" : {
				"ts" : Timestamp(1601699221, 1),
				"t" : NumberLong(1)
			},
....
rs0:PRIMARY>

现象观察

主库宕机从库升主

[root@mongo01 ~]# systemctl stop mongod.service 
[root@mongo01 ~]#

[root@mongo02 ~]# mongo
rs0:PRIMARY>

老主库恢复化身为从

[root@mongo01 ~]# systemctl start mongod.service 
[root@mongo01 ~]# mongo
rs0:SECONDARY>

主库可读可写

rs0:PRIMARY> use d1
switched to db d1
rs0:PRIMARY> db.inventory.insertOne({ item: "canvas", qty: 100, tags: ["cotton"], size: { h: 28, w: 35.5, uom: "cm" } })
{
	"acknowledged" : true,
	"insertedId" : ObjectId("5f781dffb7a689be3046aa1a")
}
rs0:PRIMARY> db.inventory.find()
{ "_id" : ObjectId("5f781dffb7a689be3046aa1a"), "item" : "canvas", "qty" : 100, "tags" : [ "cotton" ], "size" : { "h" : 28, "w" : 35.5, "uom" : "cm" } }
rs0:PRIMARY>

从库默认不可读

rs0:SECONDARY> use d1
switched to db d1
rs0:SECONDARY> show tables
uncaught exception: Error: listCollections failed: {
....
rs0:SECONDARY>

从库可设置可读

rs0:SECONDARY> rs.secondaryOk()
rs0:SECONDARY> show tables
inventory
rs0:SECONDARY> db.inventory.find()
{ "_id" : ObjectId("5f781dffb7a689be3046aa1a"), "item" : "canvas", "qty" : 100, "tags" : [ "cotton" ], "size" : { "h" : 28, "w" : 35.5, "uom" : "cm" } }

从库不可写

rs0:SECONDARY> db.inventory.insertOne({ item: "journal", qty: 25, tags: ["blank", "red"], size: { h: 14, w: 21, uom: "cm" } })
uncaught exception: WriteCommandError({
....
rs0:SECONDARY>