在CentOS6.6上以replSet方式部署MongoDB集群

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部署方式
在3台centos6.6系统上以Replica Set方式部署mongodb3.0.2集群。

官方参考资料：

http://docs.mongodb.org/manual/tutorial/deploy-replica-set/

http://docs.mongodb.org/manual/tutorial/install-mongodb-on-red-hat/

集群的IP地址分配
# node01: 192.168.35.173（PRIMARY node）
# node02: 192.168.35.96（SECONDARY node）
# node03: 192.168.35.174（SECONDARY node）

# 添加mongodb的yum源（所有节点）

echo "[mongodb-org-3.0]" > /etc/yum.repos.d/mongodb-org-3.0.repo
echo "name=MongoDB Repository" >> /etc/yum.repos.d/mongodb-org-3.0.repo
echo "baseurl=http://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.0/x86_64/" >> /etc/yum.repos.d/mongodb-org-3.0.repo
echo "gpgcheck=0" >> /etc/yum.repos.d/mongodb-org-3.0.repo
echo "enabled=1" >> /etc/yum.repos.d/mongodb-org-3.0.repo

# yum安装mongodb（所有节点）

yum install -y mongodb-org-3.0.2 mongodb-org-server-3.0.2 mongodb-org-shell-3.0.2 mongodb-org-mongos-3.0.2 mongodb-org-tools-3.0.2
mkdir -p /data/db && chown -R mongod.mongod /data/

# 修改主机名和hosts文件（所有节点）

# vim /etc/sysconfig/network
# sysctl kernel.hostname=node0001.nemongo.com
# sysctl kernel.hostname=node0002.nemongo.com
# sysctl kernel.hostname=node0003.nemongo.com

echo "192.168.35.173 node0001.nemongo.com" >> /etc/hosts
echo "192.168.35.96 node0002.nemongo.com" >> /etc/hosts
echo "192.168.35.174 node0003.nemongo.com" >> /etc/hosts

# 修改mongodb的配置文件（所有节点）

sed -i 's/bind_ip=127.0.0.1/#bind_ip=127.0.0.1/g' /etc/mongod.conf
sed -i 's/#replSet=setname/replSet=ne_aws_01/g' /etc/mongod.conf

# 启动mongodb（所有节点）

service mongod start

# 在mongodb主节点上配置集群（PRIMARY 节点）

mongo
> rs.initiate() # 只有node0001上面需要执行rs.initiate()
> rs.conf()
> rs.add("node0002.nemongo.com") # node0002上面不要执行rs.initiate()，否则无法添加
> rs.add("node0003.nemongo.com") # node0003上面不要执行rs.initiate()，否则无法添加
> rs.status() # 每个节点上都可以查看集群状态

> rs.initiate()

{

"info2" : "no configuration explicitly specified -- making one",

"me" : "node0001.nemongo.com:27017",

"ok" : 0,

"errmsg" : "No host described in new configuration 1 for replica set ne_aws_01 maps to this node",

"code" : 93

}

ne_aws_01:PRIMARY> rs.add("node0002.nemongo.com:27017")

{ "ok" : 1 }

ne_aws_01:PRIMARY> rs.add("node0003.nemongo.com")

{ "ok" : 1 }

ne_aws_01:PRIMARY> rs.status()

{

"set" : "ne_aws_01",

"date" : ISODate("2015-05-08T04:49:30.768Z"),

"myState" : 1,

"members" : [

{

"_id" : 0,

"name" : "node0001.nemongo.com:27017",

"health" : 1,

"state" : 1,

"stateStr" : "PRIMARY",

"uptime" : 1471,

"optime" : Timestamp(1431060383, 1),

"optimeDate" : ISODate("2015-05-08T04:46:23Z"),

"electionTime" : Timestamp(1431059099, 1),

"electionDate" : ISODate("2015-05-08T04:24:59Z"),

"configVersion" : 3,

"self" : true

},

{

"_id" : 1,

"name" : "node0002.nemongo.com:27017",

"health" : 1,

"state" : 2,

"stateStr" : "SECONDARY",

"uptime" : 192,

"optime" : Timestamp(1431060383, 1),

"optimeDate" : ISODate("2015-05-08T04:46:23Z"),

"lastHeartbeat" : ISODate("2015-05-08T04:49:29.756Z"),

"lastHeartbeatRecv" : ISODate("2015-05-08T04:49:30.263Z"),

"pingMs" : 1,

"configVersion" : 3

},

{

"_id" : 2,

"name" : "node0003.nemongo.com:27017",

"health" : 1,

"state" : 2,

"stateStr" : "SECONDARY",

"uptime" : 187,

"optime" : Timestamp(1431060383, 1),

"optimeDate" : ISODate("2015-05-08T04:46:23Z"),

"lastHeartbeat" : ISODate("2015-05-08T04:49:29.756Z"),

"lastHeartbeatRecv" : ISODate("2015-05-08T04:49:29.795Z"),

"pingMs" : 1,

"lastHeartbeatMessage" : "could not find member to sync from",

"configVersion" : 3

}

],

"ok" : 1

}

将mongodb主节点停掉：service mongod stop，这时候mongodb集群将会重新选举产生新的primary节点，在node0002上查看集群状态：

ne_aws_01:PRIMARY> rs.status()

{

"set" : "ne_aws_01",

"date" : ISODate("2015-05-08T04:51:13.359Z"),

"myState" : 1,

"members" : [

{

"_id" : 0,

"name" : "node0001.nemongo.com:27017",

"health" : 0,

"state" : 8,

"stateStr" : "(not reachable/healthy)",

"uptime" : 0,

"optime" : Timestamp(0, 0),

"optimeDate" : ISODate("1970-01-01T00:00:00Z"),

"lastHeartbeat" : ISODate("2015-05-08T04:51:11.361Z"),

"lastHeartbeatRecv" : ISODate("2015-05-08T04:51:11.951Z"),

"pingMs" : 1,

"lastHeartbeatMessage" : "Failed attempt to connect to node0001.nemongo.com:27017; couldn't connect to server node0001.nemongo.com:27017 (192.168.35.173), connection attempt failed",

"configVersion" : -1

},

{

"_id" : 1,

"name" : "node0002.nemongo.com:27017",

"health" : 1,

"state" : 1,

"stateStr" : "PRIMARY",

"uptime" : 364,

"optime" : Timestamp(1431060383, 1),

"optimeDate" : ISODate("2015-05-08T04:46:23Z"),

"electionTime" : Timestamp(1431060617, 1),

"electionDate" : ISODate("2015-05-08T04:50:17Z"),

"configVersion" : 3,

"self" : true

},

{

"_id" : 2,

"name" : "node0003.nemongo.com:27017",

"health" : 1,

"state" : 2,

"stateStr" : "SECONDARY",

"uptime" : 284,

"optime" : Timestamp(1431060383, 1),

"optimeDate" : ISODate("2015-05-08T04:46:23Z"),

"lastHeartbeat" : ISODate("2015-05-08T04:51:13.159Z"),

"lastHeartbeatRecv" : ISODate("2015-05-08T04:51:12.703Z"),

"pingMs" : 1,

"configVersion" : 3

}

],

"ok" : 1

}

将node0001重新启动：service mongod start，再次查看mongodb集群状态，就会发现node0001变成了SECONDARY节点：

ne_aws_01:SECONDARY> rs.status()

{

"set" : "ne_aws_01",

"date" : ISODate("2015-05-08T04:53:54.550Z"),

"myState" : 2,

"members" : [

{

"_id" : 0,

"name" : "node0001.nemongo.com:27017",

"health" : 1,

"state" : 2,

"stateStr" : "SECONDARY",

"uptime" : 168,

"optime" : Timestamp(1431060383, 1),

"optimeDate" : ISODate("2015-05-08T04:46:23Z"),

"configVersion" : 3,

"self" : true

},

{

"_id" : 1,

"name" : "node0002.nemongo.com:27017",

"health" : 1,

"state" : 1,

"stateStr" : "PRIMARY",

"uptime" : 167,

"optime" : Timestamp(1431060383, 1),

"optimeDate" : ISODate("2015-05-08T04:46:23Z"),

"lastHeartbeat" : ISODate("2015-05-08T04:53:53.474Z"),

"lastHeartbeatRecv" : ISODate("2015-05-08T04:53:52.881Z"),

"pingMs" : 1,

"electionTime" : Timestamp(1431060617, 1),

"electionDate" : ISODate("2015-05-08T04:50:17Z"),

"configVersion" : 3

},

{

"_id" : 2,

"name" : "node0003.nemongo.com:27017",

"health" : 1,

"state" : 2,

"stateStr" : "SECONDARY",

"uptime" : 167,

"optime" : Timestamp(1431060383, 1),

"optimeDate" : ISODate("2015-05-08T04:46:23Z"),

"lastHeartbeat" : ISODate("2015-05-08T04:53:53.474Z"),

"lastHeartbeatRecv" : ISODate("2015-05-08T04:53:54.382Z"),

"pingMs" : 1,

"configVersion" : 3

}

],

"ok" : 1

}

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