centos7部署MongoDB數據庫複製集（超詳細）

centos7部署MongoDB數據庫複製集（超詳細）
重點：複製集概述；複製集實現原理；複製集的應用案例；
一、概述：
組成：
Mongodb複製集（副本集replica set）由一組Mongod實例（進程）組成，包含一個Primary節點和多個Secondary節點，Mongodb Driver（客戶端）的所有數據都寫入Primary，Secondary通過oplog來同步Primary的數據，保證主節點和從節點數據的一致性，複製集在完成主從複製的基礎上，通過心跳機制，一旦primary節點出現宕機，則觸發選舉一個新的主節點，剩下的secondary節點指向新的primary，時間應該在10-30s內完成感知primary節點故障，實現高可用數據庫集羣；
特點：
主是唯一的，但不是固定的；
由大多數據原則保證數據的一致性；
從庫無法寫入（默認情況下，不使用驅動連接時，也是不能查詢的）；
相對於傳統的主從結構，複製集可以自動容災；

二、原理：
角色（按是否存儲數據劃分）：
Primary：主節點，由選舉產生，負責客戶端的寫操作，產生oplog日誌文件；
Secondary：從節點，負責客戶端的讀操作，提供數據的備份和故障的切換；
Arbiter：仲裁節點，只參與選舉的投票，不會成爲primary，也不向Primary同步數據，若部署了一個2個節點的複製集，1個Primary，1個Secondary，任意節點宕機，複製集將不能提供服務了（無法選出Primary），這時可以給複製集添加一個Arbiter節點，即使有節點宕機，仍能選出Primary；
角色（按類型區分）：
Standard（標準）：這種是常規節點，它存儲一份完整的數據副本，參與投票選舉，有可能成爲主節點；
Passive（被動）：存儲完整的數據副本，參與投票，不能成爲活躍節點。
Arbiter（投票）：仲裁節點只參與投票，不接收復制的數據，也不能成爲活躍節點。
注：每個參與節點（非仲裁者）有個優先權（0-1000），優先權（priority）爲0則是被動的，不能成爲活躍節點，優先權不爲0的，按照由大到小選出活躍節點，優先值一樣的則看誰的數據比較新；
注：Mongodb 3.0裏，複製集成員最多50個，參與Primary選舉投票的成員最多7個；

選舉：
每個節點通過優先級定義出節點的類型（標準、被動、投票）；
標準節點通過對比自身數據進行選舉出peimary節點或者secondary節點；
影響選舉的因素：
1.心跳檢測：複製集內成員每隔兩秒向其他成員發送心跳檢測信息，若10秒內無響應，則標記其爲不可用；
2.連接：在多個節點中，最少保證兩個節點爲活躍狀態，如果集羣中共三個節點，掛掉兩個節點，那麼剩餘的節點無論狀態是primary還是處於選舉過程中，都會直接被降權爲secondary；
觸發選舉的情況：
1.初始化狀態 2.從節點們無法與主節點進行通信 3.主節點辭職
主節點辭職的情況：
1.在接收到replSetStepDown命令後；
2.在現有的環境中，其他secondary節點的數據落後於本身10s內，且擁有更高優先級；
3.當主節點無法與羣集中多數節點通信；
注：當主節點辭職後，主節點將關閉自身所有的連接，避免出現客戶端在從節點進行寫入操作；

三、應用案例：

異常處理：
當Primary宕機時，如果有數據未同步到Secondary，當Primary重新加入時，如果新的Primary上已經發生了寫操作，則舊Primary需要回滾部分操作，以保證數據集與新的Primary一致。舊Primary將回滾的數據寫到單獨的rollback目錄下，數據庫管理員可根據需要使用mongorestore進行恢復。

環境：
系統主機名 IP地址軟件
Centos 7.4 mongodb.benet.com 192.168.100.101 mongodb-linux-x86_64-rhel70-3.6.3.tgz

 實驗步驟：
1.安裝mongodb；
2.創建並啓動四個實例；
3.配置實例；
4.創建複製集並添加節點；
5.模擬Primary節點出現故障，查看角色切換情況；
6.手動切換Primary角色；
7.指定節點的優先級，驗證角色重選情況；
8.將標準節點統統停掉，被動節點也不會成爲主節點；
9.查詢複製集狀態以及查看oplog日誌文件的大小；

部署用戶認證登錄（密鑰對）的複製集；

 安裝mongodb；
下載mongodb軟件包；
[root@mongodb ~]# tar zxvf mongodb-linux-x86_64-rhel70-3.6.3.tgz
[root@mongodb ~]# mv mongodb-linux-x86_64-rhel70-3.6.3 /usr/local/mongodb
[root@mongodb ~]# echo "export PATH=/usr/local/mongodb/bin:\$PATH" >>/etc/profile
[root@mongodb ~]# source /etc/profile
[root@mongodb ~]# ulimit -n 25000
[root@mongodb ~]# ulimit -u 25000
[root@mongodb ~]# echo 0 >/proc/sys/vm/zone_reclaim_mode
[root@mongodb ~]# sysctl -w vm.zone_reclaim_mode=0
[root@mongodb ~]# echo never >/sys/kernel/mm/transparent_hugepage/enabled
[root@mongodb ~]# echo never >/sys/kernel/mm/transparent_hugepage/defrag

 創建並啓動四個實例；
[root@mongodb ~]# cd /usr/local/mongodb/bin/
[root@mongodb bin]# mkdir {../mongodb1,../mongodb2,../mongodb3,../mongodb4}
[root@mongodb bin]# mkdir ../logs
[root@mongodb bin]# touch ../logs/mongodb{1..4}.log
[root@mongodb bin]# chmod 777 ../logs/mongodb
[root@mongodb bin]# cat <<END >>/usr/local/mongodb/bin/mongodb1.conf
bind_ip=192.168.100.101
port=27017
dbpath=/usr/local/mongodb/mongodb1/
logpath=/usr/local/mongodb/logs/mongodb1.log
logappend=true
fork=true
maxConns=5000
replSet=haha
#replication name
END
[root@mongodb bin]# cat <<END >>/usr/local/mongodb/bin/mongodb2.conf
bind_ip=192.168.100.101
port=27018
dbpath=/usr/local/mongodb/mongodb2/
logpath=/usr/local/mongodb/logs/mongodb2.log
logappend=true
fork=true
maxConns=5000
replSet=haha
END
[root@mongodb bin]# cat <<END >>/usr/local/mongodb/bin/mongodb3.conf
bind_ip=192.168.100.101
port=27019
dbpath=/usr/local/mongodb/mongodb3/
logpath=/usr/local/mongodb/logs/mongodb3.log
logappend=true
fork=true
maxConns=5000
replSet=haha
END
[root@mongodb bin]# cat <<END >>/usr/local/mongodb/bin/mongodb4.conf
bind_ip=192.168.100.101
port=27020
dbpath=/usr/local/mongodb/mongodb4/
logpath=/usr/local/mongodb/logs/mongodb4.log
logappend=true
fork=true
maxConns=5000
replSet=haha
END
[root@mongodb bin]# cd
[root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb1.conf
[root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb2.conf
[root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb3.conf
[root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb4.conf
[root@mongodb ~]# netstat -utpln |grep mongod
tcp 0 0 192.168.100.101:27019 0.0.0.0: LISTEN 2271/mongod
tcp 0 0 192.168.100.101:27020 0.0.0.0: LISTEN 15260/mongod
tcp 0 0 192.168.100.101:27017 0.0.0.0: LISTEN 2440/mongod
tcp 0 0 192.168.100.101:27018 0.0.0.0:* LISTEN 1412/mongod
[root@mongodb ~]# echo -e "/usr/local/mongodb/bin/mongod -f /usr/local/mongodb/bin/mongodb1.conf \n/usr/local/mongodb/bin/mongod -f /usr/local/mongodb/bin/mongodb2.conf\n/usr/local/mongodb/bin/mongod -f /usr/local/mongodb/bin/mongodb3.conf\n/usr/local/mongodb/bin/mongod -f /usr/local/mongodb/bin/mongodb4.conf">>/etc/rc.local
[root@mongodb ~]# chmod +x /etc/rc.local
[root@mongodb ~]# cat <<END >>/etc/init.d/mongodb
#!/bin/bash
INSTANCE=\$1
ACTION=\$2
case "\$ACTION" in
'start')
/usr/local/mongodb/bin/mongod -f /usr/local/mongodb/bin/"\$INSTANCE".conf;;
'stop')
/usr/local/mongodb/bin/mongod -f /usr/local/mongodb/bin/"\$INSTANCE".conf --shutdown;;
'restart')
/usr/local/mongodb/bin/mongod -f /usr/local/mongodb/bin/"\$INSTANCE".conf --shutdown
/usr/local/mongodb/bin/mongod -f /usr/local/mongodb/bin/"\$INSTANCE".conf;;
esac
END
[root@mongodb ~]# chmod +x /etc/init.d/mongodb
[root@mongodb ~]# /etc/init.d/mongodb mongodb1 stop
killing process with pid: 1301
[root@mongodb ~]# /etc/init.d/mongodb mongodb1 start
about to fork child process, waiting until server is ready for connections.
forked process: 1457
child process started successfully, parent exiting
[root@mongodb ~]# mongo --port 27017 --host 192.168.100.101

 配置實例；
[root@mongodb ~]# mongo --port 27017 --host 192.168.100.101

show dbs
2018-04-19T04:34:35.871+0800 E QUERY [thread1] Error: listDatabases failed:{
"ok" : 0,
"errmsg" : "not master and slaveOk=false",
"code" : 13435,
"codeName" : "NotMasterNoSlaveOk"
} :br/>_getErrorWithCode@src/mongo/shell/utils.js:25:13
Mongo.prototype.getDBs@src/mongo/shell/mongo.js:65:1 br/>shellHelper.show@src/mongo/shell/utils.js:816:19
shellHelper@src/mongo/shell/utils.js:706:15 br/>@(shellhelp2):1:1
rs.status()
{
"info" : "run rs.initiate(...) if not yet done for the set",
"ok" : 0,
"errmsg" : "no replset config has been received",
"code" : 94,
"codeName" : "NotYetInitialized"
}
rs.isMaster() ##查看複製集節點
{
"ismaster" : false,
"secondary" : false,
"info" : "Does not have a valid replica set config",
"isreplicaset" : true,
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"maxWriteBatchSize" : 100000,
"localTime" : ISODate("2018-04-18T20:36:31.698Z"),
"minWireVersion" : 0,
"maxWireVersion" : 6,
"readOnly" : false,
"ok" : 1
}
exit
[root@mongodb ~]# mongo --port 27018 --host 192.168.100.101
show dbs
2018-04-19T04:34:56.884+0800 E QUERY [thread1] Error: listDatabases failed:{
"ok" : 0,
"errmsg" : "not master and slaveOk=false",
"code" : 13435,
"codeName" : "NotMasterNoSlaveOk"
} :br/>_getErrorWithCode@src/mongo/shell/utils.js:25:13
Mongo.prototype.getDBs@src/mongo/shell/mongo.js:65:1 br/>shellHelper.show@src/mongo/shell/utils.js:816:19
shellHelper@src/mongo/shell/utils.js:706:15 br/>@(shellhelp2):1:1
exit

 創建複製集並添加節點；
[root@mongodb ~]# mongo --port 27017 --host 192.168.100.101

cfg={"_id":"haha","members":[{"_id":0,"host":"192.168.100.101:27017"},{"_id":1,"host":"192.168.100.101:27018"},{"_id":2,"host":"192.168.100.101:27019"}]} ##添加節點
{
"_id" : "haha",
"members" : [
{
"_id" : 0,
"host" : "192.168.100.101:27017"
},
{
"_id" : 1,
"host" : "192.168.100.101:27018"
},
{
"_id" : 2,
"host" : "192.168.100.101:27019"
}
]
}
rs.initiate(cfg) ##初始化節點
{
"ok" : 1,
"operationTime" : Timestamp(1524083843, 1),
"$clusterTime" : {
"clusterTime" : Timestamp(1524083843, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
haha:OTHER>
haha:PRIMARY>
haha:PRIMARY> rs.status()
{
"set" : "haha",
"date" : ISODate("2018-04-18T20:37:54.095Z"),
"myState" : 1,
"term" : NumberLong(1),
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1524083855, 5),
"t" : NumberLong(1)
},
"readConcernMajorityOpTime" : {
"ts" : Timestamp(1524083855, 5),
"t" : NumberLong(1)
},
"appliedOpTime" : {
"ts" : Timestamp(1524083855, 5),
"t" : NumberLong(1)
},
"durableOpTime" : {
"ts" : Timestamp(1524083855, 5),
"t" : NumberLong(1)
}
},
"members" : [
{
"_id" : 0,
"name" : "192.168.100.101:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 329,
"optime" : {
"ts" : Timestamp(1524083855, 5),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-04-18T20:37:35Z"),
"infoMessage" : "could not find member to sync from",
"electionTime" : Timestamp(1524083854, 1),
"electionDate" : ISODate("2018-04-18T20:37:34Z"),
"configVersion" : 1,
"self" : true
},
{
"_id" : 1,
"name" : "192.168.100.101:27018",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 30,
"optime" : {
"ts" : Timestamp(1524083855, 5),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1524083855, 5),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-04-18T20:37:35Z"),
"optimeDurableDate" : ISODate("2018-04-18T20:37:35Z"),
"lastHeartbeat" : ISODate("2018-04-18T20:37:54.043Z"),
"lastHeartbeatRecv" : ISODate("2018-04-18T20:37:52.499Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "192.168.100.101:27017",
"configVersion" : 1
},
{
"_id" : 2,
"name" : "192.168.100.101:27019",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 30,
"optime" : {
"ts" : Timestamp(1524083855, 5),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1524083855, 5),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-04-18T20:37:35Z"),
"optimeDurableDate" : ISODate("2018-04-18T20:37:35Z"),
"lastHeartbeat" : ISODate("2018-04-18T20:37:54.043Z"),
"lastHeartbeatRecv" : ISODate("2018-04-18T20:37:52.500Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "192.168.100.101:27017",
"configVersion" : 1
}
],
"ok" : 1,
"operationTime" : Timestamp(1524083855, 5),
"$clusterTime" : {
"clusterTime" : Timestamp(1524083855, 5),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
haha:PRIMARY> rs.addArb("192.168.100.101:27020") ##添加仲裁節點
{
"ok" : 1,
"operationTime" : Timestamp(1524083905, 1),
"$clusterTime" : {
"clusterTime" : Timestamp(1524083905, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
haha:PRIMARY> rs.status()
{
"set" : "haha",
"date" : ISODate("2018-04-18T20:38:41.468Z"),
"myState" : 1,
"term" : NumberLong(1),
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1524083915, 1),
"t" : NumberLong(1)
},
"readConcernMajorityOpTime" : {
"ts" : Timestamp(1524083915, 1),
"t" : NumberLong(1)
},
"appliedOpTime" : {
"ts" : Timestamp(1524083915, 1),
"t" : NumberLong(1)
},
"durableOpTime" : {
"ts" : Timestamp(1524083915, 1),
"t" : NumberLong(1)
}
},
"members" : [
{
"_id" : 0,
"name" : "192.168.100.101:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 376,
"optime" : {
"ts" : Timestamp(1524083915, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-04-18T20:38:35Z"),
"infoMessage" : "could not find member to sync from",
"electionTime" : Timestamp(1524083854, 1),
"electionDate" : ISODate("2018-04-18T20:37:34Z"),
"configVersion" : 2,
"self" : true
},
{
"_id" : 1,
"name" : "192.168.100.101:27018",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 78,
"optime" : {
"ts" : Timestamp(1524083905, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1524083905, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-04-18T20:38:25Z"),
"optimeDurableDate" : ISODate("2018-04-18T20:38:25Z"),
"lastHeartbeat" : ISODate("2018-04-18T20:38:41.134Z"),
"lastHeartbeatRecv" : ISODate("2018-04-18T20:38:40.134Z"),
"pingMs" : NumberLong(0),
"configVersion" : 2
},
{
"_id" : 2,
"name" : "192.168.100.101:27019",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 78,
"optime" : {
"ts" : Timestamp(1524083905, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1524083905, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-04-18T20:38:25Z"),
"optimeDurableDate" : ISODate("2018-04-18T20:38:25Z"),
"lastHeartbeat" : ISODate("2018-04-18T20:38:41.134Z"),
"lastHeartbeatRecv" : ISODate("2018-04-18T20:38:40.136Z"),
"pingMs" : NumberLong(0),
"configVersion" : 2
},
{
"_id" : 3,
"name" : "192.168.100.101:27020",
"health" : 1,
"state" : 7,
"stateStr" : "ARBITER",
"uptime" : 16,
"lastHeartbeat" : ISODate("2018-04-18T20:38:41.137Z"),
"lastHeartbeatRecv" : ISODate("2018-04-18T20:38:40.140Z"),
"pingMs" : NumberLong(0),
"configVersion" : 2
}
],
"ok" : 1,
"operationTime" : Timestamp(1524083915, 1),
"$clusterTime" : {
"clusterTime" : Timestamp(1524083915, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
注：rs.add()和rs.remove()命令分別用於添加和刪除標準節點
haha:PRIMARY> show dbs
admin 0.000GB
config 0.000GB
local 0.000GB
haha:PRIMARY> use cloud
switched to db cloud
haha:PRIMARY> db.users.insert({"id":"1","name":"xiaoming"})
WriteResult({ "nInserted" : 1 })
haha:PRIMARY> db.users.find()
{ "_id" : ObjectId("5ad7b245f6308759d4605b5c"), "id" : "1", "name" : "xiaoming" }
haha:PRIMARY> show dbs
admin 0.000GB
cloud 0.000GB
config 0.000GB
local 0.000GB
haha:PRIMARY> exit
[root@mongodb ~]# mongo --port 27018 --host 192.168.100.101
haha:SECONDARY> rs.status()
{
"set" : "haha",
"date" : ISODate("2018-04-18T20:50:50.975Z"),
"myState" : 2,
"term" : NumberLong(1),
"syncingTo" : "192.168.100.101:27017",
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1524084645, 1),
"t" : NumberLong(1)
},
"readConcernMajorityOpTime" : {
"ts" : Timestamp(1524084645, 1),
"t" : NumberLong(1)
},
"appliedOpTime" : {
"ts" : Timestamp(1524084645, 1),
"t" : NumberLong(1)
},
"durableOpTime" : {
"ts" : Timestamp(1524084645, 1),
"t" : NumberLong(1)
}
},
"members" : [
{
"_id" : 0,
"name" : "192.168.100.101:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 805,
"optime" : {
"ts" : Timestamp(1524084645, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1524084645, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-04-18T20:50:45Z"),
"optimeDurableDate" : ISODate("2018-04-18T20:50:45Z"),
"lastHeartbeat" : ISODate("2018-04-18T20:50:49.966Z"),
"lastHeartbeatRecv" : ISODate("2018-04-18T20:50:49.997Z"),
"pingMs" : NumberLong(0),
"electionTime" : Timestamp(1524083854, 1),
"electionDate" : ISODate("2018-04-18T20:37:34Z"),
"configVersion" : 2
},
{
"_id" : 1,
"name" : "192.168.100.101:27018",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 1497,
"optime" : {
"ts" : Timestamp(1524084645, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-04-18T20:50:45Z"),
"syncingTo" : "192.168.100.101:27017",
"configVersion" : 2,
"self" : true
},
{
"_id" : 2,
"name" : "192.168.100.101:27019",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 805,
"optime" : {
"ts" : Timestamp(1524084645, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1524084645, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-04-18T20:50:45Z"),
"optimeDurableDate" : ISODate("2018-04-18T20:50:45Z"),
"lastHeartbeat" : ISODate("2018-04-18T20:50:49.811Z"),
"lastHeartbeatRecv" : ISODate("2018-04-18T20:50:49.965Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "192.168.100.101:27017",
"configVersion" : 2
},
{
"_id" : 3,
"name" : "192.168.100.101:27020",
"health" : 1,
"state" : 7,
"stateStr" : "ARBITER",
"uptime" : 745,
"lastHeartbeat" : ISODate("2018-04-18T20:50:49.966Z"),
"lastHeartbeatRecv" : ISODate("2018-04-18T20:50:50.378Z"),
"pingMs" : NumberLong(0),
"configVersion" : 2
}
],
"ok" : 1,
"operationTime" : Timestamp(1524084645, 1),
"$clusterTime" : {
"clusterTime" : Timestamp(1524084645, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
haha:SECONDARY> show dbs ##secondary節點默認無法讀取，可以通過以下方式或者驅動方式實現
2018-04-19T04:52:42.813+0800 E QUERY [thread1] Error: listDatabases failed:{
"operationTime" : Timestamp(1524084755, 1),
"ok" : 0,
"errmsg" : "not master and slaveOk=false",
"code" : 13435,
"codeName" : "NotMasterNoSlaveOk",
"$clusterTime" : {
"clusterTime" : Timestamp(1524084755, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
} :br/>_getErrorWithCode@src/mongo/shell/utils.js:25:13
Mongo.prototype.getDBs@src/mongo/shell/mongo.js:65:1 br/>shellHelper.show@src/mongo/shell/utils.js:816:19
shellHelper@src/mongo/shell/utils.js:706:15 br/>@(shellhelp2):1:1
haha:SECONDARY> db.getMongo().setSlaveOk();
haha:SECONDARY> show dbs
admin 0.000GB
cloud 0.000GB
config 0.000GB
local 0.000GB
haha:SECONDARY> use cloud
switched to db cloud
haha:SECONDARY> db.users.insert({"id":"2","name":"xiaohong"}) ##secondary節點無法寫入
WriteResult({ "writeError" : { "code" : 10107, "errmsg" : "not master" } })
haha:SECONDARY> db.users.find()
{ "_id" : ObjectId("5ad7b245f6308759d4605b5c"), "id" : "1", "name" : "xiaoming" }
haha:SECONDARY> exit

 模擬Primary節點出現故障，查看角色切換情況；
[root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb1.conf --shutdown
killing process with pid: 1457
[root@mongodb ~]# mongo --port 27018 --host 192.168.100.101
haha:SECONDARY> rs.status()
{
"set" : "haha",
"date" : ISODate("2018-04-18T21:16:22.623Z"),
"myState" : 2,
"term" : NumberLong(2),
"syncingTo" : "192.168.100.101:27019",
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1524086155, 1),
"t" : NumberLong(1)
},
"readConcernMajorityOpTime" : {
"ts" : Timestamp(1524086155, 1),
"t" : NumberLong(1)
},
"appliedOpTime" : {
"ts" : Timestamp(1524086174, 1),
"t" : NumberLong(2)
},
"durableOpTime" : {
"ts" : Timestamp(1524086174, 1),
"t" : NumberLong(2)
}
},
"members" : [
{
"_id" : 0,
"name" : "192.168.100.101:27017",
"health" : 0,
"state" : 8,
"stateStr" : "(not reachable/healthy)",
"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("2018-04-18T21:16:19.030Z"),
"lastHeartbeatRecv" : ISODate("2018-04-18T21:16:03.344Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "Connection refused",
"configVersion" : -1
},
{
"_id" : 1,
"name" : "192.168.100.101:27018",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 3029,
"optime" : {
"ts" : Timestamp(1524086174, 1),
"t" : NumberLong(2)
},
"optimeDate" : ISODate("2018-04-18T21:16:14Z"),
"syncingTo" : "192.168.100.101:27019",
"infoMessage" : "syncing from: 192.168.100.101:27019",
"configVersion" : 2,
"self" : true
},
{
"_id" : 2,
"name" : "192.168.100.101:27019",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 2337,
"optime" : {
"ts" : Timestamp(1524086174, 1),
"t" : NumberLong(2)
},
"optimeDurable" : {
"ts" : Timestamp(1524086174, 1),
"t" : NumberLong(2)
},
"optimeDate" : ISODate("2018-04-18T21:16:14Z"),
"optimeDurableDate" : ISODate("2018-04-18T21:16:14Z"),
"lastHeartbeat" : ISODate("2018-04-18T21:16:19.030Z"),
"lastHeartbeatRecv" : ISODate("2018-04-18T21:16:21.575Z"),
"pingMs" : NumberLong(0),
"electionTime" : Timestamp(1524086173, 1),
"electionDate" : ISODate("2018-04-18T21:16:13Z"),
"configVersion" : 2
},
{
"_id" : 3,
"name" : "192.168.100.101:27020",
"health" : 1,
"state" : 7,
"stateStr" : "ARBITER",
"uptime" : 2277,
"lastHeartbeat" : ISODate("2018-04-18T21:16:19.030Z"),
"lastHeartbeatRecv" : ISODate("2018-04-18T21:16:20.894Z"),
"pingMs" : NumberLong(0),
"configVersion" : 2
}
],
"ok" : 1,
"operationTime" : Timestamp(1524086174, 1),
"$clusterTime" : {
"clusterTime" : Timestamp(1524086174, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
haha:SECONDARY> exit
[root@mongodb ~]# mongo --port 27019 --host 192.168.100.101
haha:PRIMARY> exit
[root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb1.conf

 手動切換Primary角色；
[root@mongodb ~]# mongo --port 27019 --host 192.168.100.101
haha:PRIMARY> rs.stepDown(60,30)
haha:SECONDARY> exit
[root@mongodb ~]# mongo --port 27018 --host 192.168.100.101
haha:PRIMARY> exit

 指定節點的優先級，驗證角色重選情況；
[root@mongodb ~]# mongo --port 27018 --host 192.168.100.101
haha:PRIMARY> cfg={"_id":"haha","members":[{"_id":0,"host":"192.168.100.101:27017","priority":100},{"_id":1,"host":"192.168.100.101:27018","priority":100},{"_id":2,"host":"192.168.100.101:27019","priority":10}]}
{
"_id" : "haha",
"members" : [
{
"_id" : 0,
"host" : "192.168.100.101:27017",
"priority" : 100
},
{
"_id" : 1,
"host" : "192.168.100.101:27018",
"priority" : 100
},
{
"_id" : 2,
"host" : "192.168.100.101:27019",
"priority" : 10
}
]
}
haha:PRIMARY> rs.reconfig(cfg)
{
"ok" : 1,
"operationTime" : Timestamp(1524086716, 1),
"$clusterTime" : {
"clusterTime" : Timestamp(1524086716, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
haha:PRIMARY> rs.isMaster()
{
"hosts" : [
"192.168.100.101:27017",
"192.168.100.101:27018",
"192.168.100.101:27019"
],
"setName" : "haha",
"setVersion" : 3,
"ismaster" : true,
"secondary" : false,
"primary" : "192.168.100.101:27018",
"me" : "192.168.100.101:27018",
"electionId" : ObjectId("7fffffff0000000000000003"),
"lastWrite" : {
"opTime" : {
"ts" : Timestamp(1524086733, 1),
"t" : NumberLong(3)
},
"lastWriteDate" : ISODate("2018-04-18T21:25:33Z"),
"majorityOpTime" : {
"ts" : Timestamp(1524086733, 1),
"t" : NumberLong(3)
},
"majorityWriteDate" : ISODate("2018-04-18T21:25:33Z")
},
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"maxWriteBatchSize" : 100000,
"localTime" : ISODate("2018-04-18T21:25:42.122Z"),
"logicalSessionTimeoutMinutes" : 30,
"minWireVersion" : 0,
"maxWireVersion" : 6,
"readOnly" : false,
"ok" : 1,
"operationTime" : Timestamp(1524086733, 1),
"$clusterTime" : {
"clusterTime" : Timestamp(1524086733, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
haha:PRIMARY> exit
[root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb2.conf --shutdown
[root@mongodb ~]# mongo --port 27017 --host 192.168.100.101
haha:PRIMARY> exit

 將標準節點統統停掉，被動節點也不會成爲主節點；
[root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb1.conf --shutdown
[root@mongodb ~]# mongo --port 27019 --host 192.168.100.101
haha:SECONDARY> rs.status()
{
"set" : "haha",
"date" : ISODate("2018-04-18T21:29:42.973Z"),
"myState" : 2,
"term" : NumberLong(5),
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1524086961, 1),
"t" : NumberLong(5)
},
"readConcernMajorityOpTime" : {
"ts" : Timestamp(1524086961, 1),
"t" : NumberLong(5)
},
"appliedOpTime" : {
"ts" : Timestamp(1524086961, 1),
"t" : NumberLong(5)
},
"durableOpTime" : {
"ts" : Timestamp(1524086961, 1),
"t" : NumberLong(5)
}
},
"members" : [
{
"_id" : 0,
"name" : "192.168.100.101:27017",
"health" : 0,
"state" : 8,
"stateStr" : "(not reachable/healthy)",
"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("2018-04-18T21:29:38.566Z"),
"lastHeartbeatRecv" : ISODate("2018-04-18T21:29:26.484Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "Connection refused",
"configVersion" : -1
},
{
"_id" : 1,
"name" : "192.168.100.101:27018",
"health" : 0,
"state" : 8,
"stateStr" : "(not reachable/healthy)",
"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("2018-04-18T21:29:38.566Z"),
"lastHeartbeatRecv" : ISODate("2018-04-18T21:26:42.249Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "Connection refused",
"configVersion" : -1
},
{
"_id" : 2,
"name" : "192.168.100.101:27019",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 3826,
"optime" : {
"ts" : Timestamp(1524086961, 1),
"t" : NumberLong(5)
},
"optimeDate" : ISODate("2018-04-18T21:29:21Z"),
"infoMessage" : "could not find member to sync from",
"configVersion" : 3,
"self" : true
}
],
"ok" : 1,
"operationTime" : Timestamp(1524086961, 1),
"$clusterTime" : {
"clusterTime" : Timestamp(1524086961, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
haha:SECONDARY> exit
[root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb1.conf
[root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb2.conf
[root@mongodb ~]# netstat -utpln |grep mongod
tcp 0 0 192.168.100.101:27019 0.0.0.0: LISTEN 1357/mongod
tcp 0 0 192.168.100.101:27020 0.0.0.0: LISTEN 1385/mongod
tcp 0 0 192.168.100.101:27017 0.0.0.0: LISTEN 14363/mongod
tcp 0 0 192.168.100.101:27018 0.0.0.0: LISTEN 14442/mongod

 查詢複製集狀態以及查看oplog日誌文件的大小；
[root@mongodb ~]# mongo --port 27018 --host 192.168.100.101
haha:PRIMARY> use local
haha:PRIMARY> rs.printSlaveReplicationInfo() ##查看節點信息
source: 192.168.100.101:27017
syncedTo: Thu Apr 19 2018 05:34:37 GMT+0800 (CST)
0 secs (0 hrs) behind the primary
source: 192.168.100.101:27019
syncedTo: Thu Apr 19 2018 05:34:37 GMT+0800 (CST)
0 secs (0 hrs) behind the primary
haha:PRIMARY> rs.printReplicationInfo()
configured oplog size: 990MB
log length start to end: 3464secs (0.96hrs)
oplog first event time: Thu Apr 19 2018 04:37:23 GMT+0800 (CST)
oplog last event time: Thu Apr 19 2018 05:35:07 GMT+0800 (CST)
now: Thu Apr 19 2018 05:35:16 GMT+0800 (CST)
haha:PRIMARY> db.oplog.rs.stats()
{
"ns" : "local.oplog.rs",
"size" : 50356,
"count" : 450,
"avgObjSize" : 111,
"storageSize" : 61440,
"capped" : true,
"max" : -1,
"maxSize" : 1038090240, ##單位是KB
...

 部署用戶認證登錄（密鑰對）的複製集；
[root@mongodb ~]# mongo --port 27018 --host 192.168.100.101
haha:PRIMARY> use admin
switched to db admin
haha:PRIMARY> db.createUser({"user":"root","pwd":"123","roles":["root"]})
Successfully added user: { "user" : "root", "roles" : [ "root" ] }
haha:PRIMARY> exit
[root@mongodb ~]# echo -e "clusterAuthMode=keyFile\nkeyFile=/usr/local/mongodb/bin/cloudkey1" >>/usr/local/mongodb/bin/mongodb1.conf
[root@mongodb ~]# echo -e "clusterAuthMode=keyFile\nkeyFile=/usr/local/mongodb/bin/cloudkey2" >>/usr/local/mongodb/bin/mongodb2.conf
[root@mongodb ~]# echo -e "clusterAuthMode=keyFile\nkeyFile=/usr/local/mongodb/bin/cloudkey3" >>/usr/local/mongodb/bin/mongodb3.conf
[root@mongodb ~]# echo "haha key" >/usr/local/mongodb/bin/cloudkey1
[root@mongodb ~]# echo "haha key" >/usr/local/mongodb/bin/cloudkey2
[root@mongodb ~]# echo "haha key" >/usr/local/mongodb/bin/cloudkey3
[root@mongodb ~]# chmod 600 /usr/local/mongodb/bin/cloudkey*
[root@mongodb ~]# /etc/init.d/mongodb mongodb1 restart
[root@mongodb ~]# /etc/init.d/mongodb mongodb2 restart
[root@mongodb ~]# /etc/init.d/mongodb mongodb3 restart
[root@mongodb ~]# mongo --port 27018 --host 192.168.100.101
haha:PRIMARY> show dbs
2018-04-19T12:02:57.720+0800 E QUERY [thread1] Error: listDatabases failed:{
"operationTime" : Timestamp(1524110569, 1),
"ok" : 0,
"errmsg" : "not authorized on admin to execute command { listDatabases: 1.0, $clusterTime: { clusterTime: Timestamp(1524110569, 1), signature: { hash: BinData(0, 85A5B587BFFE4B2FB534789EA87032CB263D8121), keyId: 6545890313586606081 } }, $db: \"admin\" }",
...
haha:PRIMARY> use admin
switched to db admin
haha:PRIMARY> db.auth("root","123")
1
haha:PRIMARY> show dbs
admin 0.000GB
cloud 0.000GB
config 0.000GB
local 0.000GB
haha:PRIMARY> exit

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