安装:linux 下指定配置文件安装mongodb
1、复制集replica sets
1.1 什么是复制集?
复制集是由一组拥有相同数据集的mongod实例做组成的集群。
复制集是一个集群,它是2台及2台以上的服务器组成,以及复制集成员包括Primary主节点,secondary从节点和投票节点。
复制集提供了数据的冗余备份,并在多个服务器上存储数据副本,提高了数据的可用性,保证数据的安全性。
1.2 为什么要使用复制集
1.高可用
防止设备(服务器、网络)故障。
提供自动failover 功能。
技术来保证高可用
2.灾难恢复
当发生故障时,可以从其他节点恢复 用于备份。
3.功能隔离
我们可以在备节点上执行读操作,减少主节点的压力
比如:用于分析、报表,数据挖掘,系统任务等。
2 复制集搭建
注:如果之前安装过mongon ,请先停掉
[root@VM_0_4_centos mongodb-linux-x86_64-amazon-3.6.21]# ./bin/mongod --shutdown --dbpath /home/mongodb-linux-x86_64-amazon-3.6.21/data/mongo
步骤:
//新建文件夹
mkdir replica_sets
//copy
cp cp mongodb-linux-x86_64-amazon-3.6.21.tgz replica_sets/
cd replica_sets/
//解压
tar -xvf mongodb-linux-x86_64-amazon-3.6.21.tgz
节点配置
[root@VM_0_4_centos mongodb-linux-x86_64-amazon-3.6.21]# vi mongo_37017.conf
[root@VM_0_4_centos mongodb-linux-x86_64-amazon-3.6.21]# cp mongo_37017.conf mongo_37018.conf
[root@VM_0_4_centos mongodb-linux-x86_64-amazon-3.6.21]# cp mongo_37018.conf mongo_37019.conf
[root@VM_0_4_centos mongodb-linux-x86_64-amazon-3.6.21]# mkdir /data/mongo/data/server1 -p
[root@VM_0_4_centos mongodb-linux-x86_64-amazon-3.6.21]# mkdir /data/mongo/data/server2 -p
[root@VM_0_4_centos mongodb-linux-x86_64-amazon-3.6.21]# mkdir /data/mongo/data/server3 -p
[root@VM_0_4_centos mongodb-linux-x86_64-amazon-3.6.21]# mkdir /data/mongo/logs
1.主节点配置 mongo_37017.conf
# 主节点配置
dbpath=/data/mongo/data/server1
bind_ip=0.0.0.0
port=37017
fork=true
logpath=/data/mongo/logs/server37017.log
replSet=wgCluster
2.从节点1配置 mongo_37018.conf
# 从节点配置
dbpath=/data/mongo/data/server2
bind_ip=0.0.0.0
port=37018
fork=true
logpath=/data/mongo/logs/server37018.log
replSet=wgCluster
3.从节点2配置 mongo_37019.conf
dbpath=/data/mongo/data/server3
bind_ip=0.0.0.0
port=37019
fork=true
logpath=/data/mongo/logs/server37019.log
replSet=wgCluster
4.初始化节点配置
//启动节点
[root@VM_0_4_centos mongodb-linux-x86_64-amazon-3.6.21]# ./bin/mongod -f mongo_37017.conf
about to fork child process, waiting until server is ready for connections.
forked process: 10653
//进入节点
[root@VM_0_4_centos mongodb-linux-x86_64-amazon-3.6.21]# ./bin/mongo --port 37017
启动三个节点 然后进入任意一个节点 运行如下命令:
var cfg ={"_id":"lagouCluster",
"protocolVersion" : 1,
"members":[
{"_id":1,"host":"主机ip:37017","priority":10},
{"_id":2,"host":"主机ip:37018"}
]
}
rs.initiate(cfg)
rs.status()
5.节点的动态增删,上边我们只添加了俩个节点,下边动态的增加删除节点。
增加节点
rs.add("192.168.211.133:37019")
删除slave 节点
rs.remove("192.168.211.133:37019")
查看节点状态
wgCluster:PRIMARY> rs.status()
{
"set" : "wgCluster",
"date" : ISODate("2020-12-24T01:19:35.883Z"),
"myState" : 1,
"term" : NumberLong(1),
"syncingTo" : "",
"syncSourceHost" : "",
"syncSourceId" : -1,
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1608772772, 1),
"t" : NumberLong(1)
},
"readConcernMajorityOpTime" : {
"ts" : Timestamp(1608772772, 1),
"t" : NumberLong(1)
},
"appliedOpTime" : {
"ts" : Timestamp(1608772772, 1),
"t" : NumberLong(1)
},
"durableOpTime" : {
"ts" : Timestamp(1608772772, 1),
"t" : NumberLong(1)
}
},
"members" : [
{
"_id" : 1,
"name" : "152.136.193.58:37017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 57238,
"optime" : {
"ts" : Timestamp(1608772772, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2020-12-24T01:19:32Z"),
"syncingTo" : "",
"syncSourceHost" : "",
"syncSourceId" : -1,
"infoMessage" : "",
"electionTime" : Timestamp(1608715848, 1),
"electionDate" : ISODate("2020-12-23T09:30:48Z"),
"configVersion" : 2,
"self" : true,
"lastHeartbeatMessage" : ""
},
{
"_id" : 2,
"name" : "152.136.193.58:37018",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 56937,
"optime" : {
"ts" : Timestamp(1608772772, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1608772772, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2020-12-24T01:19:32Z"),
"optimeDurableDate" : ISODate("2020-12-24T01:19:32Z"),
"lastHeartbeat" : ISODate("2020-12-24T01:19:33.896Z"),
"lastHeartbeatRecv" : ISODate("2020-12-24T01:19:34.917Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "152.136.193.58:37017",
"syncSourceHost" : "152.136.193.58:37017",
"syncSourceId" : 1,
"infoMessage" : "",
"configVersion" : 2
},
{
"_id" : 3,
"name" : "152.136.193.58:37019",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 13,
"optime" : {
"ts" : Timestamp(1608772772, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1608772772, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2020-12-24T01:19:32Z"),
"optimeDurableDate" : ISODate("2020-12-24T01:19:32Z"),
"lastHeartbeat" : ISODate("2020-12-24T01:19:33.897Z"),
"lastHeartbeatRecv" : ISODate("2020-12-24T01:19:35.214Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "152.136.193.58:37017",
"syncSourceHost" : "152.136.193.58:37017",
"syncSourceId" : 1,
"infoMessage" : "",
"configVersion" : 2
}
],
"ok" : 1,
"operationTime" : Timestamp(1608772772, 1),
"$clusterTime" : {
"clusterTime" : Timestamp(1608772772, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
6.复制集操作演示
进入主节点 ----- 插入数据 ------ 进入从节点验证注意:默认节点下从节点不能读取数据。调用 rs.slaveOk() 解决
为了保证高可用,在集群当中如果主节点挂掉后,会自动 在从节点中选举一个 重新做为主节点。rs.status()节点说明:PRIMARY 主节点: 可以查询和新增数据SECONDARY 从节点:只能查询 不能新增 基于priority 权重可以被选为主节点ARBITER 仲裁节点: 不能查询数据 和新增数据 ,不能变成主节点
7.主从自动切换操作演示
现在我们起俩个窗口,一主一从(37017主机,37018从机),新开启窗口干掉主节点。。验证从节点是否会变成主节点。发现从节点37018变成主节点,,当再次启动节点37017节点,因优先界别高,37017会再次变为主节点。
8.添加冲裁节点
注:新建配置文件mongo_37020.conf,并建立server4 文件夹,启动37020节点
#仲裁节点
dbpath=/data/mongo/data/server4
bind_ip=0.0.0.0
port=37020
fork=true
logpath=/data/mongo/logs/server37020.log
replSet=wgCluster
配置方式
var cfg ={"_id":"wgCluster",
"protocolVersion" : 1,
"members":[
{"_id":1,"host":"152.136.193.58:37017","priority":10},
{"_id":2,"host":"152.136.193.58:37018","priority":0},
{"_id":3,"host":"152.136.193.58:37019","priority":5},
{"_id":4,"host":"152.136.193.58:37020","arbiterOnly":true}
]
};
// 重新装载配置,并重新生成集群节点。
rs.reconfig(cfg)
//重新查看集群状态
rs.status()
动态添加
和上面的配置步骤相同 只是增加了 一个特殊的仲裁节点
注入节点 执行 rs.addArb("IP:端口");
rs.addArb("192.168.211.133:37020")