一 安装
1.1 下载MongoDB
我个人不太喜欢用wget url, 之前出现过wget下载的包有问题的情况
https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.4.7.tgz
1.2 上传服务器并解压
tar -zxvf mongodb-linux-x86_64-3.4.7.tgz
1.3 移动到/data/program/software/mongodb
mv mongodb-linux-x86_64-3.4.7/ /data/program/software/mongodb
1.4 进入到mongodb目录下
mkdir db
mkdir logs
1.5 进入到bin目录下
新建配置文件:touch mongodb.conf
dbpath=/data/program/software/mongodb/db
logpath=/data/program/software/mongodb/logs/mongodb.log
port=27017
fork=true
nohttpinterface=true
1.6 启动
分别在三台机器上启动
/data/program/software/mongodb/bin/mongod --replSet repset -f /data/program/software/mongodb/bin/mongodb.conf
1.7 查看是否启动成功
ps -ef |grep mongodb
1.8 建立集群
1.8.1 登录客户端
选择以上任意一台服务器登录客户端
/data/program/software/mongodb/bin/mongo
1.8.2 切换到admin数据库
use admin
1.8.3 建立集群
定义副本集配置变量，这里的_id:"repset"和上面命理参数--replSet repset保持一致
config={_id:"repset", members:[{_id:0,host:"132.232.47.139"},{_id:1,host:"45.40.199.46"},{_id:2,host:"132.232.40.31"}]}
输入以上变量后输入下面内容说明没问题
rs.initiate(config)
执行上面语句，如果输出下面内容说明没问题
1.8.5 查看集群状态
rs.status()
{
"set" : "repset",
"date" : ISODate("2018-08-05T12:20:02.096Z"),
"myState" : 1,
"term" : NumberLong(1),
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1533471594, 1),
"t" : NumberLong(1)
},
"appliedOpTime" : {
"ts" : Timestamp(1533471594, 1),
"t" : NumberLong(1)
},
"durableOpTime" : {
"ts" : Timestamp(1533471594, 1),
"t" : NumberLong(1)
}
},
"members" : [
{
"_id" : 0,
"name" : "132.232.47.139:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 4360,
"optime" : {
"ts" : Timestamp(1533471594, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-08-05T12:19:54Z"),
"infoMessage" : "could not find member to sync from",
"electionTime" : Timestamp(1533471513, 1),
"electionDate" : ISODate("2018-08-05T12:18:33Z"),
"configVersion" : 1,
"self" : true
},
{
"_id" : 1,
"name" : "45.40.199.46:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 100,
"optime" : {
"ts" : Timestamp(1533471594, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1533471594, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-08-05T12:19:54Z"),
"optimeDurableDate" : ISODate("2018-08-05T12:19:54Z"),
"lastHeartbeat" : ISODate("2018-08-05T12:20:01.211Z"),
"lastHeartbeatRecv" : ISODate("2018-08-05T12:20:01.767Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "132.232.47.139:27017",
"configVersion" : 1
},
{
"_id" : 2,
"name" : "132.232.40.31:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 100,
"optime" : {
"ts" : Timestamp(1533471594, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1533471594, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-08-05T12:19:54Z"),
"optimeDurableDate" : ISODate("2018-08-05T12:19:54Z"),
"lastHeartbeat" : ISODate("2018-08-05T12:20:01.211Z"),
"lastHeartbeatRecv" : ISODate("2018-08-05T12:20:01.769Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "132.232.47.139:27017",
"configVersion" : 1
}
],
"ok" : 1
}
1.8.6 测试集群功能
a 主节点服务器登录客户端
./mongo
b 连接test数据库
use test
c 往testdb表中插入数据
db.testdb.insert({"test1":"testval1"})
d 连接到副本节点客户端
./mongo 45.40.199.46:27017
e 使用test数据库
use test
f 查询表格
show tables
如果出现以下报错
mongodb默认是从主节点读写数据，副本节点上不允许读，设置副本节点可读
g 设置读权限
db.getMongo().setSlaveOk()
h 查询在主节点上插入的数据
db.testdb.find()
i 测试集群恢复功能
1 将主节点服务停掉后在登录其他节点客户端查看集群状态
{
"set" : "repset",
"date" : ISODate("2018-08-05T13:15:05.136Z"),
"myState" : 1,
"term" : NumberLong(2),
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1533474896, 1),
"t" : NumberLong(2)
},
"appliedOpTime" : {
"ts" : Timestamp(1533474896, 1),
"t" : NumberLong(2)
},
"durableOpTime" : {
"ts" : Timestamp(1533474896, 1),
"t" : NumberLong(2)
}
},
"members" : [
{
"_id" : 0,
"name" : "132.232.47.139:27017",
"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("2018-08-05T13:15:03.341Z"),
"lastHeartbeatRecv" : ISODate("2018-08-05T13:12:24.585Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "Connection refused",
"configVersion" : -1
},
{
"_id" : 1,
"name" : "45.40.199.46:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 7653,
"optime" : {
"ts" : Timestamp(1533474896, 1),
"t" : NumberLong(2)
},
"optimeDate" : ISODate("2018-08-05T13:14:56Z"),
"electionTime" : Timestamp(1533474755, 1),
"electionDate" : ISODate("2018-08-05T13:12:35Z"),
"configVersion" : 1,
"self" : true
},
{
"_id" : 2,
"name" : "132.232.40.31:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 3401,
"optime" : {
"ts" : Timestamp(1533474896, 1),
"t" : NumberLong(2)
},
"optimeDurable" : {
"ts" : Timestamp(1533474896, 1),
"t" : NumberLong(2)
},
"optimeDate" : ISODate("2018-08-05T13:14:56Z"),
"optimeDurableDate" : ISODate("2018-08-05T13:14:56Z"),
"lastHeartbeat" : ISODate("2018-08-05T13:15:03.282Z"),
"lastHeartbeatRecv" : ISODate("2018-08-05T13:15:03.165Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "45.40.199.46:27017",
"configVersion" : 1
}
],
"ok" : 1
}
结论:_id=1的服务现在变成了主节点，_id=0的服务现在不可用了
2 再次将原来的132.232.47.139这台机器启动起来
{
"set" : "repset",
"date" : ISODate("2018-08-05T13:19:08.073Z"),
"myState" : 1,
"term" : NumberLong(2),
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1533475146, 1),
"t" : NumberLong(2)
},
"appliedOpTime" : {
"ts" : Timestamp(1533475146, 1),
"t" : NumberLong(2)
},
"durableOpTime" : {
"ts" : Timestamp(1533475146, 1),
"t" : NumberLong(2)
}
},
"members" : [
{
"_id" : 0,
"name" : "132.232.47.139:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 4,
"optime" : {
"ts" : Timestamp(1533474744, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1533474744, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-08-05T13:12:24Z"),
"optimeDurableDate" : ISODate("2018-08-05T13:12:24Z"),
"lastHeartbeat" : ISODate("2018-08-05T13:19:07.545Z"),
"lastHeartbeatRecv" : ISODate("2018-08-05T13:19:03.326Z"),
"pingMs" : NumberLong(0),
"configVersion" : 1
},
{
"_id" : 1,
"name" : "45.40.199.46:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 7896,
"optime" : {
"ts" : Timestamp(1533475146, 1),
"t" : NumberLong(2)
},
"optimeDate" : ISODate("2018-08-05T13:19:06Z"),
"electionTime" : Timestamp(1533474755, 1),
"electionDate" : ISODate("2018-08-05T13:12:35Z"),
"configVersion" : 1,
"self" : true
},
{
"_id" : 2,
"name" : "132.232.40.31:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 3644,
"optime" : {
"ts" : Timestamp(1533475146, 1),
"t" : NumberLong(2)
},
"optimeDurable" : {
"ts" : Timestamp(1533475146, 1),
"t" : NumberLong(2)
},
"optimeDate" : ISODate("2018-08-05T13:19:06Z"),
"optimeDurableDate" : ISODate("2018-08-05T13:19:06Z"),
"lastHeartbeat" : ISODate("2018-08-05T13:19:07.360Z"),
"lastHeartbeatRecv" : ISODate("2018-08-05T13:19:07.255Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "45.40.199.46:27017",
"configVersion" : 1
}
],
"ok" : 1
}
结论：_id=1的这个服务还是主节点，_id=0的服务变成了副本节点