centos7部署MongoDB数据库复制集(超详细)
重点:复制集概述;复制集实现原理;复制集的应用案例;
一、概述:
组成:
Mongodb复制集(副本集replica set)由一组Mongod实例(进程)组成,包含一个Primary节点和多个Secondary节点,Mongodb Driver(客户端)的所有数据都写入Primary,Secondary通过oplog来同步Primary的数据,保证主节点和从节点数据的一致性,复制集在完成主从复制的基础上,通过心跳机制,一旦primary节点出现宕机,则触发选举一个新的主节点,剩下的secondary节点指向新的primary,时间应该在10-30s内完成感知primary节点故障,实现高可用数据库集群;
特点:
主是唯一的,但不是固定的;
由大多数据原则保证数据的一致性;
从库无法写入(默认情况下,不使用驱动连接时,也是不能查询的);
相对于传统的主从结构,复制集可以自动容灾;

二、原理:
角色(按是否存储数据划分):
Primary:主节点,由选举产生,负责客户端的写操作,产生oplog日志文件;
Secondary:从节点,负责客户端的读操作,提供数据的备份和故障的切换;
Arbiter:仲裁节点,只参与选举的投票,不会成为primary,也不向Primary同步数据,若部署了一个2个节点的复制集,1个Primary,1个Secondary,任意节点宕机,复制集将不能提供服务了(无法选出Primary),这时可以给复制集添加一个Arbiter节点,即使有节点宕机,仍能选出Primary;
角色(按类型区分):
Standard(标准):这种是常规节点,它存储一份完整的数据副本,参与投票选举,有可能成为主节点;
Passive(被动):存储完整的数据副本,参与投票,不能成为活跃节点。
Arbiter(投票):仲裁节点只参与投票,不接收复制的数据,也不能成为活跃节点。
注:每个参与节点(非仲裁者)有个优先权(0-1000),优先权(priority)为0则是被动的,不能成为活跃节点,优先权不为0的,按照由大到小选出活跃节点,优先值一样的则看谁的数据比较新;
注:Mongodb 3.0里,复制集成员最多50个,参与Primary选举投票的成员最多7个;

选举:
每个节点通过优先级定义出节点的类型(标准、被动、投票);
标准节点通过对比自身数据进行选举出peimary节点或者secondary节点;
影响选举的因素:
1.心跳检测:复制集内成员每隔两秒向其他成员发送心跳检测信息,若10秒内无响应,则标记其为不可用;
2.连接:在多个节点中,最少保证两个节点为活跃状态,如果集群中共三个节点,挂掉两个节点,那么剩余的节点无论状态是primary还是处于选举过程中,都会直接被降权为secondary;
触发选举的情况:
1.初始化状态 2.从节点们无法与主节点进行通信 3.主节点辞职
主节点辞职的情况:
1.在接收到replSetStepDown命令后;
2.在现有的环境中,其他secondary节点的数据落后于本身10s内,且拥有更高优先级;
3.当主节点无法与群集中多数节点通信;
注:当主节点辞职后,主节点将关闭自身所有的连接,避免出现客户端在从节点进行写入操作;
centos7部署MongoDB数据库复制集(超详细)

三、应用案例:
centos7部署MongoDB数据库复制集(超详细)
异常处理:
当Primary宕机时,如果有数据未同步到Secondary,当Primary重新加入时,如果新的Primary上已经发生了写操作,则旧Primary需要回滚部分操作,以保证数据集与新的Primary一致。旧Primary将回滚的数据写到单独的rollback目录下,数据库管理员可根据需要使用mongorestore进行恢复。

环境:
系统 主机名 IP地址 软件
Centos 7.4 mongodb.benet.com 192.168.100.101 mongodb-linux-x86_64-rhel70-3.6.3.tgz

 实验步骤:
1.安装mongodb;
2.创建并启动四个实例;
3.配置实例;
4.创建复制集并添加节点;
5.模拟Primary节点出现故障,查看角色切换情况;
6.手动切换Primary角色;
7.指定节点的优先级,验证角色重选情况;
8.将标准节点统统停掉,被动节点也不会成为主节点;
9.查询复制集状态以及查看oplog日志文件的大小;

  1. 部署用户认证登录(密钥对)的复制集;

 安装mongodb;
下载mongodb软件包;
[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

 创建并启动四个实例;
[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

 配置实例;
[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() ##查看复制集节点
{
"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

 创建复制集并添加节点;
[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"}]} ##添加节点
{
"_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) ##初始化节点
{
"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") ##添加仲裁节点
{
"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()命令分别用于添加和删除标准节点
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),
"$clusterTime" : {
"clusterTime" : Timestamp(1524084645, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
haha:SECONDARY> show dbs ##secondary节点默认无法读取,可以通过以下方式或者驱动方式实现
2018-04-19T04:52:42.813+0800 E QUERY [thread1] Error: listDatabases failed:{
"operationTime" : Timestamp(1524084755, 1),
"ok" : 0,
"errmsg" : "not master and slaveOk=false",
"code" : 13435,
"codeName" : "NotMasterNoSlaveOk",
"$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节点无法写入
WriteResult({ "writeError" : { "code" : 10107, "errmsg" : "not master" } })
haha:SECONDARY> db.users.find()
{ "_id" : ObjectId("5ad7b245f6308759d4605b5c"), "id" : "1", "name" : "xiaoming" }
haha:SECONDARY> exit

 模拟Primary节点出现故障,查看角色切换情况;
[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

 手动切换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

 指定节点的优先级,验证角色重选情况;
[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

 将标准节点统统停掉,被动节点也不会成为主节点;
[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

 查询复制集状态以及查看oplog日志文件的大小;
[root@mongodb ~]# mongo --port 27018 --host 192.168.100.101
haha:PRIMARY> use local
haha:PRIMARY> rs.printSlaveReplicationInfo() ##查看节点信息
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, ##单位是KB
...

 部署用户认证登录(密钥对)的复制集;
[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