文章目录

环境初定搭建过程现象观察

环境初定

MongoDB安装过程参考：https://blog.csdn.net/weixin_42480750/article/details/108902137

MongoDB自动安装脚本：https://blog.csdn.net/weixin_42480750/article/details/108908684

功用IPHOSTReplica Set Primary13.13.5.5/16mongo01Replica Set Secondary13.13.6.6/16mongo02Replica Set Secondary13.13.7.7/16mongo03

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>