一、前提：
（1）mongoDB使用稳定版本：mongodb-linux-x86_64-rhel70-3.6.3.tgz；
（2）可在master上安装后，scp到其他slave机器上。
二、配置mongoDB：
首先要注意在生产环境中目录结构要定义好，防止在项目过多的时候找不到所需的项目
- 目录统一放在/home下面 ，首先创建mongodb项目目录
#创建项目目录
cd /home
mkdir mongodb
#进入 mongodb目录中新建三个目录conf、logs 、db
cd /home/mongodb
#conf存储配置文件目录，logs用来存储日志目录，db用来存储数据目录
mkdir conf logs db
- 将 mongodb-linux-x86_64-rhel70-3.6.3.tgz 放在 /home/mongodb下，并解压缩，解压缩完成后可删除安装包：
#解压缩
tar -zxvf mongodb-linux-x86_64-rhel70-3.6.3.tgz
#完成后可删除
rm -f mongodb-linux-x86_64-rhel70-3.6.3.tgz
- 修改配置文件
（1）进入conf目录新建mongodb的配置文件mongodb.conf
cd /home/mongodb/conf/
touch mongodb.conf
（2）编写配置文件mongodb.conf,内容如下 :
其中dbpath是数据库文件目录，logpath是日志目录，port是mongodb所占用的端口，fork是true的时候表示在后台启动
fork=true
port=27017
bind_ip=0.0.0.0
dbpath=/home/mongodb/db
logpath=/home/mongodb/logs/mongodb.log
logappend=true
replSet=mongodbBak
directoryperdb=true
journal=true
（3）将安装配置好的mongodb目录复制到所有slave节点中：
scp -r /home/mongodb/ root@slave1:/home/
scp -r /home/mongodb/ root@slave2:/home/
scp -r /home/mongodb/ root@slave3:/home/
三、启动mongodb：
1)所有节点启动mongodb
cd /home/mongodb/mongodb-linux-x86_64-rhel70-3.6.3/bin/
./mongod -f /home/mongodb/conf/mongodb.conf
2)单机mongodb，开机自启动
（1）添加开机启动服务：
vi /lib/systemd/system/mongodb.service
粘贴一下内容
[Unit]
Description=The Mongodb Process Manager
After=syslog.target network.target
[Service]
Type=forking
ExecStart=/home/mongodb/mongodb-linux-x86_64-rhel70-3.6.3/bin/mongod -f /home/mongodb/conf/mongodb.conf
ExecReload=/bin/kill -s HUP $MAINPID
ExecStop=/home/mongodb/mongodb-linux-x86_64-rhel70-3.6.3/bin/mongod --shutdown --config /home/mongodb/conf/mongodb.conf
PrivateTmp=true
[Install]
WantedBy=multi-user.target
（2） 设置开机启动：
systemctl daemon-reload
systemctl start mongodb.service
systemctl enable mongodb.service
（3） 检查是否安装成功：
ps -ef|grep mongodb
四、初始化mongodb集群：
- 任意一台mongodb登陆：
cd /home/mongodb/mongodb-linux-x86_64-rhel70-3.6.3/bin/
./mongo 192.168.2.158
- 在连接mongdo后，输入一下内容：
#使用admin库
use admin
#输入config 内容
config = {"_id" : "mongodbBak","members" : [{"_id" : 0, "host" : "192.168.2.158:27017"},{"_id" : 1, "host" : "192.168.2.159:27017"},{"_id" : 2, "host" : "192.168.2.177:27017"},{"_id" : 3, "host" : "192.168.2.178:27017"}]}
- 然后回车，执行初始化副本集配置命令：
rs.initiate(config);
#输出
{
"ok" : 1,
"operationTime" : Timestamp(1519887335, 1),
"$clusterTime" : {
"clusterTime" : Timestamp(1519887335, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
- 查看集群节点的状态
rs.status();
#输出
{
"set" : "mongodbBak",
"date" : ISODate("2018-03-01T06:56:58.886Z"),
"myState" : 1,
"term" : NumberLong(1),
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1519887417, 1),
"t" : NumberLong(1)
},
"readConcernMajorityOpTime" : {
"ts" : Timestamp(1519887417, 1),
"t" : NumberLong(1)
},
"appliedOpTime" : {
"ts" : Timestamp(1519887417, 1),
"t" : NumberLong(1)
},
"durableOpTime" : {
"ts" : Timestamp(1519887417, 1),
"t" : NumberLong(1)
}
},
"members" : [
{
"_id" : 0,
"name" : "192.168.2.158:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 724,
"optime" : {
"ts" : Timestamp(1519887417, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-03-01T06:56:57Z"),
"infoMessage" : "could not find member to sync from",
"electionTime" : Timestamp(1519887346, 1),
"electionDate" : ISODate("2018-03-01T06:55:46Z"),
"configVersion" : 1,
"self" : true
},
{
"_id" : 1,
"name" : "192.168.2.159:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 83,
"optime" : {
"ts" : Timestamp(1519887417, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1519887417, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-03-01T06:56:57Z"),
"optimeDurableDate" : ISODate("2018-03-01T06:56:57Z"),
"lastHeartbeat" : ISODate("2018-03-01T06:56:58.601Z"),
"lastHeartbeatRecv" : ISODate("2018-03-01T06:56:57.724Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "192.168.2.158:27017",
"configVersion" : 1
},
{
"_id" : 2,
"name" : "192.168.2.177:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 83,
"optime" : {
"ts" : Timestamp(1519887417, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1519887417, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-03-01T06:56:57Z"),
"optimeDurableDate" : ISODate("2018-03-01T06:56:57Z"),
"lastHeartbeat" : ISODate("2018-03-01T06:56:58.602Z"),
"lastHeartbeatRecv" : ISODate("2018-03-01T06:56:57.938Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "192.168.2.158:27017",
"configVersion" : 1
},
{
"_id" : 3,
"name" : "192.168.2.178:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 83,
"optime" : {
"ts" : Timestamp(1519887417, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1519887417, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-03-01T06:56:57Z"),
"optimeDurableDate" : ISODate("2018-03-01T06:56:57Z"),
"lastHeartbeat" : ISODate("2018-03-01T06:56:58.602Z"),
"lastHeartbeatRecv" : ISODate("2018-03-01T06:56:57.320Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "192.168.2.158:27017",
"configVersion" : 1
}
],
"ok" : 1,
"operationTime" : Timestamp(1519887417, 1),
"$clusterTime" : {
"clusterTime" : Timestamp(1519887417, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
至此，mongodb集群搭建完毕！
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