西湖鱼 发表于 2018-10-25 11:17:10

MongoDB_3.2.10 集群 - 副本集

  mongodb
  主从模式就是一个 单副本的应用;没有很好的扩展性和容错性;
  副本集的多个副本保证了容错性;
  主服务器负责整个副本集的读写,副本集定时同步数据;主节点挂掉;副本集会自动选举一个主的服务器;
  1,安装配置;
  主节点:
  172.16.0.191
  从点节点:
  172.16.0.192
  172.16.0.193
  # wget https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel62-3.2.10.tgz
  # tar -xf mongodb-linux-x86_64-rhel62-3.2.10.tgz -C /opt
  # mv mongodb-linux-x86_64-rhel62-3.2.10.tgz mongod
  # mkdir /data/replset/db   # 设置副本集文件目录 db数据目录
  2,启动三台mongod;(防火墙开放 27017 port )
  /opt/mongod/bin/mongod --fork--port 27017 --dbpath /data/db --logpath /opt/mongod/log/mongodb.log --replSet oneset
  这边用172.16.0.191 作为主节点服务;
  3,进入mongod 配置副本集;
  # /opt/mongod/bin/mongo
  # 使用admin 数据库
  > use admin
  switched to db admin
  #定义副本集配置变量,这里的 _id:”oneset” 和上面命令参数“ –replSet oneset” 要保持一样。(可以自定义)
  > config = { _:"oneset", members:[ {_id:0,host:"172.16.0.191:27017"}, {_id:1,host:"172.16.0.192:27017"}, {_id:2,host:"172.16.0.193:27017"}] }
  {
  "_id" : "oneset",
  "members" : [
  {
  "_id" : 0,
  "host" : "172.16.15.191:27017"
  },
  {
  "_id" : 1,
  "host" : "172.16.15.192:27017"
  },
  {
  "_id" : 2,
  "host" : "172.16.15.19327017"
  }
  ]
  }
  #初始化副本集配置
  >rs.initiate(config);

  4,查阅副本集
  >rs.conf()   或者    >rs.status()
  5,任意一个从节点连接查看副本集状态:
  # bin/mongo 172.16.0.191:27017
  repset:PRIMARY> rs.status()
  {
  "set" : "repset",
  "date" : ISODate("2016-10-12T08:21:20.622Z"),
  "myState" : 1,
  "term" : NumberLong(1),
  "heartbeatIntervalMillis" : NumberLong(2000),
  "members" : [
  {
  "_id" : 0,
  "name" : "172.16.0.191:27017",
  "health" : 1,
  "state" : 1,
  "stateStr" : "PRIMARY",
  "uptime" : 1534,
  "optime" : {
  "ts" : Timestamp(1476260204, 2),
  "t" : NumberLong(1)
  },
  "optimeDate" : ISODate("2016-10-12T08:16:44Z"),
  "electionTime" : Timestamp(1476259079, 1),
  "electionDate" : ISODate("2016-10-12T07:57:59Z"),
  "configVersion" : 1,
  "self" : true
  },
  {
  "_id" : 1,
  "name" : "172.16.0.192:27017",
  "health" : 1,
  "state" : 2,
  "stateStr" : "SECONDARY",
  "uptime" : 1411,
  "optime" : {
  "ts" : Timestamp(1476260204, 2),
  "t" : NumberLong(1)
  },
  "optimeDate" : ISODate("2016-10-12T08:16:44Z"),
  "lastHeartbeat" : ISODate("2016-10-12T08:21:19.392Z"),
  "lastHeartbeatRecv" : ISODate("2016-10-12T08:21:18.816Z"),
  "pingMs" : NumberLong(0),
  "syncingTo" : "172.16.0.191:27017",
  "configVersion" : 1
  },
  {
  "_id" : 2,
  "name" : "172.16.0.193:27017",
  "health" : 1,
  "state" : 2,
  "stateStr" : "SECONDARY",
  "uptime" : 1411,
  "optime" : {
  "ts" : Timestamp(1476260204, 2),
  "t" : NumberLong(1)
  },
  "optimeDate" : ISODate("2016-10-12T08:16:44Z"),
  "lastHeartbeat" : ISODate("2016-10-12T08:21:19.390Z"),
  "lastHeartbeatRecv" : ISODate("2016-10-12T08:21:18.941Z"),
  "pingMs" : NumberLong(0),
  "syncingTo" : "172.16.0.191:27017",
  "configVersion" : 1
  }
  ],
  "ok" : 1
  }
  6, 主节点插入一条测试数据;

  repset:PRIMARY> use abcd
  switched to db abcd
  repset:PRIMARY> db.abcddb.insert({"name":"字母"})
  WriteResult({ "nInserted" : 1 })
  7,从节点查看;
  # /opt/mongod/bin/mongo 172.16.0.191:27017

  再:
  # /opt/mongod/bin/mongo

  # mongodb默认是从主节点读写数据的,副本节点上不允许读,需要设置副本节点可以读。
  repset:SECONDARY> db.getMongo().setSlaveOk();
  repset:SECONDARY> use abcd;
  switched to db abcd
  repset:SECONDARY> db.abcddb.find();
  { "_id" : ObjectId("57fe09dd38d5a26b011dfe06"), "name" : "字母" }}
  8,加添节点
  添加节点,需要在主节点进行
  PRIMARY>>rs.add(hostname:port)
  9,删减节点
  删减节点,需要在主节点进行
  PRIMARY>rs.remove(hostname:port)

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