一、基本概念
1、副本集：一个副本集就是一组MongoDB实例组成的集群，由一个主（Primary）服务器和多个备份（Secondary）服务器构成
2、主节点（master）：主节点接收所有写入操作。主节点将对其数据集所做的所有更改记录到其 oplog。
3、副节点（secondary）：复制主节点的 oplog 并将操作应用到其数据集，如果主节点不可用，一个合格的副节点将被选为新的主节点。
4、仲裁节点（arbiter）：负载选举，当主节点不可用，它将从副节点中选一个作为主节点。
二、部署副本集
1、下载monodb镜像，我这里版本为：3.2.11
docker pull registry.cn-hangzhou.aliyuncs.com/boshen-ns/mongodb:3.2.11
docker tag docker pull registry.cn-hangzhou.aliyuncs.com/boshen-ns/mongodb:3.2.11 mongodb:3.2.11
2、创建三个mongodb的数据目录：
mkdir -p /home/mongodb-cluster/data/master
mkdir -p /home/mongodb-cluster/data/secondary
mkdir -p /home/mongodb-cluster/data/arbiter
3、编写docker-compose.yml
version: '2.1'
services:
master:
image: mongodb:3.2.
container_name: master
restart: always
ports:
- :
volumes:
- ./data/master:/data/db
command: mongod --dbpath /data/db --replSet testSet --oplogSize
secondary:
image: mongodb:3.2.
container_name: secondary
restart: always
ports:
- :
volumes:
- ./data/secondary:/data/db
command: mongod --dbpath /data/db --replSet testSet --oplogSize
arbiter:
image: mongodb:3.2.
container_name: arbiter
restart: always
ports:
- :
volumes:
- ./data/arbiter:/data/db
command: mongod --replSet testSet --smallfiles --oplogSize
4、启动
docker-compse up -d
5、配置副本集
1）进入容器内部：
docker exec -it master mongo
2）在mongo shell里面执行：rs.initiate()
3）继续执行：rs.add('172.16.1.11:27018') 表示将secondary添加进副本集
4）继续执行：rs.add('172.16.1.11:27019',true) 其中true表示这个节点是仲裁节点
5）查看配置
testSet:PRIMARY> rs.conf()
{
"_id" : "testSet",
"version" : 77284,
"protocolVersion" : NumberLong(1),
"members" : [
{
"_id" : 0,
"host" : "172.16.1.11:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : { },
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 1,
"host" : "172.16.1.11:27018",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : { },
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 2,
"host" : "172.16.1.11:27019",
"arbiterOnly" : true,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : { },
"slaveDelay" : NumberLong(0),
"votes" : 1
}
],
"settings" : {
"chainingAllowed" : true,
"heartbeatIntervalMillis" : 2000,
"heartbeatTimeoutSecs" : 10,
"electionTimeoutMillis" : 10000,
"getLastErrorModes" : { },
"getLastErrorDefaults" : {
"w" : 1,
"wtimeout" : 0
},
"replicaSetId" : ObjectId("5c6fb85fb21aeac107319862")
}
}
6）查看状态
testSet:PRIMARY> rs.status()
{
"set" : "testSet",
"date" : ISODate("2019-02-26T02:12:48.124Z"),
"myState" : 1,
"term" : NumberLong(2),
"heartbeatIntervalMillis" : NumberLong(2000),
"members" : [
{
"_id" : 0,
"name" : "172.16.1.11:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 268,
"optime" : {
"ts" : Timestamp(1551147003, 4),
"t" : NumberLong(2)
},
"optimeDate" : ISODate("2019-02-26T02:10:03Z"),
"lastHeartbeat" : ISODate("2019-02-26T02:12:46.189Z"),
"lastHeartbeatRecv" : ISODate("2019-02-26T02:12:46.188Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "172.16.1.11:27018",
"configVersion" : 77284
},
{
"_id" : 1,
"name" : "172.16.1.11:27018",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 938,
"optime" : {
"ts" : Timestamp(1551147003, 4),
"t" : NumberLong(2)
},
"optimeDate" : ISODate("2019-02-26T02:10:03Z"),
"electionTime" : Timestamp(1551146242, 1),
"electionDate" : ISODate("2019-02-26T01:57:22Z"),
"configVersion" : 77284,
"self" : true
},
{
"_id" : 2,
"name" : "172.16.1.11:27019",
"health" : 1,
"state" : 7,
"stateStr" : "ARBITER",
"uptime" : 270,
"lastHeartbeat" : ISODate("2019-02-26T02:12:46.189Z"),
"lastHeartbeatRecv" : ISODate("2019-02-26T02:12:48.118Z"),
"pingMs" : NumberLong(0),
"configVersion" : 77284
}
],
"ok" : 1
}
如果想要修改副本集的配置，可以采用以下方法：
conf=rs.conf()
conf.members[0].host="172.16.1.11:27017"
rs.reconfig(conf,{"force":true})
三、验证mongdb可用性：
由上测试可知：副节点只能读，不能写
二、windows客户端连接mongodb
1、登录mongo shell，创建一个admin用户
testSet:PRIMARY> db.createUser({user:"admin",pwd:"admin",roles:[{"role":"userAdminAnyDatabase","db":"admin"},{"role":"readWrite","db":"testdb"}]})
Successfully added user: {
"user" : "admin",
"roles" : [
{
"role" : "userAdminAnyDatabase",
"db" : "admin"
},
{
"role" : "readWrite",
"db" : "testdb"
}
]
}2、安装 robomongo-1.0.0-windows-x86_64-89f24ea.exe
3、填写连接信息