每天一篇，深入学习MongoDB复制集
# systemctl stop firewalld.service //关闭防火墙 # setenforce 0#mongo
> show dbs
> cfg={"_id":"root123","members":[{"_id":0,"host":"192.168.200.184:27017"},{"_id":1,"host":"192.168.200.184:27018"},{"_id":2,"host":"192.168.200.184:27019"}]} //配置节点复制集
{
"_id" : "root123",
"members" : [
{
"_id" : 0,
"host" : "192.168.200.184:27017"
},
{
"_id" : 1,
"host" : "192.168.200.184:27018"
},
{
"_id" : 2,
"host" : "192.168.200.184:27019"
}
]
}
> db.stats()
{
"db" : "test",
"collections" : 0,
"views" : 0,
"objects" : 0,
"avgObjSize" : 0,
"dataSize" : 0,
"storageSize" : 0,
"numExtents" : 0,
"indexes" : 0,
"indexSize" : 0,
"fileSize" : 0,
"fsUsedSize" : 0,
"fsTotalSize" : 0,
"ok" : 1, //状态ok=1，复制成功
"$clusterTime" : {
"clusterTime" : Timestamp(0, 0),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
123:SECONDARY> rs.status() //查看复制集状态
{
"set" : "root123",
"date" : ISODate("2018-07-17T03:24:03.253Z"),
"myState" : 1,
"term" : NumberLong(1),
"syncingTo" : "",
"syncSourceHost" : "",
"syncSourceId" : -1,
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1531797840, 1),
"t" : NumberLong(1)
},
"readConcernMajorityOpTime" : {
"ts" : Timestamp(1531797840, 1),
"t" : NumberLong(1)
},
"appliedOpTime" : {
"ts" : Timestamp(1531797840, 1),
"t" : NumberLong(1)
},
"durableOpTime" : {
"ts" : Timestamp(1531797840, 1),
"t" : NumberLong(1)
}
},
"members" : [
{
"_id" : 0,
"name" : "192.168.200.184:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY", //状态1为主
"uptime" : 980,
"optime" : {
"ts" : Timestamp(1531797840, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-07-17T03:24:00Z"),
"syncingTo" : "",
"syncSourceHost" : "",
"syncSourceId" : -1,
"infoMessage" : "could not find member to sync from",
"electionTime" : Timestamp(1531797808, 1),
"electionDate" : ISODate("2018-07-17T03:23:28Z"),
"configVersion" : 1,
"self" : true,
"lastHeartbeatMessage" : ""
},
{
"_id" : 1,
"name" : "192.168.200.184:27018",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY", //状态2为从
"uptime" : 45,
"optime" : {
"ts" : Timestamp(1531797840, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1531797840, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-07-17T03:24:00Z"),
"optimeDurableDate" : ISODate("2018-07-17T03:24:00Z"),
"lastHeartbeat" : ISODate("2018-07-17T03:24:02.633Z"),
"lastHeartbeatRecv" : ISODate("2018-07-17T03:24:02.920Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "192.168.200.184:27017",
"syncSourceHost" : "192.168.200.184:27017",
"syncSourceId" : 0,
"infoMessage" : "",
"configVersion" : 1
},
{
"_id" : 2,
"name" : "192.168.200.184:27019",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY", //状态2为从
"uptime" : 45,
"optime" : {
"ts" : Timestamp(1531797840, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1531797840, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-07-17T03:24:00Z"),
"optimeDurableDate" : ISODate("2018-07-17T03:24:00Z"),
"lastHeartbeat" : ISODate("2018-07-17T03:24:02.633Z"),
"lastHeartbeatRecv" : ISODate("2018-07-17T03:24:02.896Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "192.168.200.184:27017",
"syncSourceHost" : "192.168.200.184:27017",
"syncSourceId" : 0,
"infoMessage" : "",
"configVersion" : 1
}
],
"ok" : 1,
"operationTime" : Timestamp(1531797840, 1),
"$clusterTime" : {
"clusterTime" : Timestamp(1531797840, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
root123:PRIMARY> //最后显示此状态
注:初始化配置时保证从节点没有数据
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