Mongodb 4.2版本副本集配置-坚持自己想要的

副本集或者复制集介绍：

•副本集在mongodb中是是一组 mongod保持相同的数据集过程，副本集提供冗余和高可用性，并且是所有生产部署的基础。
•复制提供冗余并增加数据可用性，在不用数据库服务器上具有多个数据副本是，复制可以提供一个级别的单一数据库服务器丢失的容错能力。
•副本集可以支撑更高的读操作，因为客户端可以向不同的服务器发送读取操作，可以配置在不同的数据中心用作遭难恢复或者报告，备份。
副本集成员最多50个，只有7个成员可以参与选举投票，多中心容灾能力，自动恢复，滚动式升级服务

常见的复制集

线上环境常见的架构为副本集，可以理解为一主多从。

下图：1主2从

下图：一主一从一仲裁

服务器信息：

三台机器一样配置2核16G内存存储盘100G

"host" : "10.1.1.159:27020"
"host" : "10.1.1.77:27020"
"host" : "10.1.1.178:27020

1、我们在其中一台机器配置：

[root@10-1-1-159 ~]# wget https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel70-4.2.1.tgz
[root@10-1-1-159 ~]# tar -zxvf mongodb-linux-x86_64-rhel70-4.2.1.tgz -C /data/
[root@10-1-1-159 ~]# mkdir /data/mongodb/{data,logs,pid,conf} -p
配置文件：

[root@10-1-1-159 ~]# cat /data/mongodb/conf/mongodb.conf
systemLog:
  destination: file
  logAppend: true
  path: /data/mongodb/logs/mongod.log

storage:
  dbPath: /data/mongodb/data
  journal:
    enabled: true
  directoryPerDB: true
  wiredTiger:
     engineConfig:
        cacheSizeGB: 8                    #如果一台机器启动一个实例这个可以注释选择默认，如果一台机器启动多个实例，需要设置内存大小，避免互相抢占内存
        directoryForIndexes: true

processManagement:
  fork: true
  pidFilePath: /data/mongodb/pid/mongod.pid

net:
  port: 27020
  bindIp: 10.1.1.159,localhost      #修改为本机IP地址
  maxIncomingConnections: 5000

#security:
  #keyFile: /data/mongodb/conf/keyfile
  #authorization: enabled
replication:
#   oplogSizeMB: 1024
   replSetName: rs02

2、将配置负复制到其他机器：

[root@10-1-1-159 ~]# scp -r /data/ [email protected]:/data/
[root@10-1-1-159 ~]# scp -r /data/ [email protected]:/data/

目录结构：

[root@10-1-1-178 data]# tree mongodb
mongodb
├── conf
│   └── mongodb.conf
├── data
├── logs
└── pid

3、三台机器分别执行：

groupadd mongod
useradd -g mongod mongod
yum install -y libcurl openssl glibc
cd /data
ln -s mongodb-linux-x86_64-rhel70-4.2.1 mongodb-4.2
chown -R mongod.mongod /data
sudo -u mongod /data/mongodb4.2.1/bin/mongod -f /data/mongodb/conf/mongodb.conf

配置复制集：
#副本集名称rs02和配置文件中replSetName保持一致

config = { _id:"rs02", members:[
{_id:0,host:"10.1.1.159:27010",priority:90},
{_id:1,host:"10.1.1.77:27010",priority:90},
{_id:2,host:"10.1.1.178:27010",arbiterOnly:true}
]
}

rs.initiate(config);

4、在其中一台机器执行：

[root@10-1-1-159 ~]# /data/mongodb3.6.9/bin/mongo  10.1.1.159:27020
> use admin
switched to db admin
> config = { _id:"rs02", members:[
...                      {_id:0,host:"10.1.1.159:27020",priority:90},
...                      {_id:1,host:"10.1.1.77:27020",priority:90},
...                      {_id:2,host:"10.1.1.178:27020",arbiterOnly:true}
...               ]
... }
{
    "_id" : "rs02",
    "members" : [
        {
            "_id" : 0,
            "host" : "10.1.1.159:27020",
            "priority" : 90
        },
        {
            "_id" : 1,
            "host" : "10.1.1.77:27020",
            "priority" : 90
        },
        {
            "_id" : 2,
            "host" : "10.1.1.178:27020",
            "arbiterOnly" : true
        }
    ]
}
>
> rs.initiate(config);        初始化副本集########eeeerrrr  
{
    "ok" : 1,
    "operationTime" : Timestamp(1583907929, 1),
    "$clusterTime" : {
        "clusterTime" : Timestamp(1583907929, 1),
        "signature" : {
            "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
            "keyId" : NumberLong(0)
        }
    }
}

5、查看节点状态

rs02:PRIMARY> rs.status()
{
    "set" : "rs02",
    "date" : ISODate("2020-03-13T07:11:09.427Z"),
    "myState" : 1,
    "term" : NumberLong(1),
    "syncingTo" : "",
    "syncSourceHost" : "",
    "syncSourceId" : -1,
    "heartbeatIntervalMillis" : NumberLong(2000),
    "optimes" : {
        "lastCommittedOpTime" : {
            "ts" : Timestamp(1584083465, 1),
            "t" : NumberLong(1)
        },
        "readConcernMajorityOpTime" : {
            "ts" : Timestamp(1584083465, 1),
            "t" : NumberLong(1)
        },
        "appliedOpTime" : {
            "ts" : Timestamp(1584083465, 1),
            "t" : NumberLong(1)
        },
        "durableOpTime" : {
            "ts" : Timestamp(1584083465, 1),
            "t" : NumberLong(1)
        }
    },
    "members" : [
        {
            "_id" : 0,
            "name" : "10.1.1.159:27020",
            "health" : 1,
            "state" : 1,
            "stateStr" : "PRIMARY",    #主节点
            "uptime" : 185477,
            "optime" : {
                "ts" : Timestamp(1584083465, 1),
                "t" : NumberLong(1)
            },
            "optimeDate" : ISODate("2020-03-13T07:11:05Z"),
            "syncingTo" : "",
            "syncSourceHost" : "",
            "syncSourceId" : -1,
            "infoMessage" : "",
            "electionTime" : Timestamp(1583907939, 1),
            "electionDate" : ISODate("2020-03-11T06:25:39Z"),
            "configVersion" : 1,
            "self" : true,
            "lastHeartbeatMessage" : ""
        },
        {
            "_id" : 1,
            "name" : "10.1.1.77:27020",
            "health" : 1,
            "state" : 2,
            "stateStr" : "SECONDARY",       #从节点
            "uptime" : 175540,
            "optime" : {
                "ts" : Timestamp(1584083465, 1),
                "t" : NumberLong(1)
            },
            "optimeDurable" : {
                "ts" : Timestamp(1584083465, 1),
                "t" : NumberLong(1)
            },
            "optimeDate" : ISODate("2020-03-13T07:11:05Z"),
            "optimeDurableDate" : ISODate("2020-03-13T07:11:05Z"),
            "lastHeartbeat" : ISODate("2020-03-13T07:11:08.712Z"),
            "lastHeartbeatRecv" : ISODate("2020-03-13T07:11:08.711Z"),
            "pingMs" : NumberLong(0),
            "lastHeartbeatMessage" : "",
            "syncingTo" : "10.1.1.159:27020",
            "syncSourceHost" : "10.1.1.159:27020",
            "syncSourceId" : 0,
            "infoMessage" : "",
            "configVersion" : 1
        },
        {
            "_id" : 2,
            "name" : "10.1.1.178:27020",
            "health" : 1,
            "state" : 7,
            "stateStr" : "ARBITER",     #仲裁节点
            "uptime" : 175540,
            "lastHeartbeat" : ISODate("2020-03-13T07:11:08.712Z"),
            "lastHeartbeatRecv" : ISODate("2020-03-13T07:11:08.711Z"),
            "pingMs" : NumberLong(0),
            "lastHeartbeatMessage" : "",
            "syncingTo" : "",
            "syncSourceHost" : "",
            "syncSourceId" : -1,
            "infoMessage" : "",
            "configVersion" : 1
        }
    ],
    "ok" : 1,
    "operationTime" : Timestamp(1584083465, 1),
    "$clusterTime" : {
        "clusterTime" : Timestamp(1584083465, 1),
        "signature" : {
            "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
            "keyId" : NumberLong(0)
        }
    }
}
rs02:PRIMARY>

7、现在副本集状态：

10.1.1.178:27020 ARBITER 仲裁节点
10.1.1.77:27020 SECONDARY 从节点
10.1.1.159:27020 PRIMARY 主节点

我们插入一些数据查，然后将主节点停掉，

仲裁节点的日志
我们可以看到，当节点10.1.1.159宕机以后，重新选举了：Member 10.1.1.77:27010 is now in state PRIMARY

2020-03-18T14:34:53.636+0800 I NETWORK  [conn9] end connection 10.1.1.159:49160 (1 connection now open)
2020-03-18T14:34:54.465+0800 I CONNPOOL [Replication] dropping unhealthy pooled connection to 10.1.1.159:27010
2020-03-18T14:34:54.465+0800 I CONNPOOL [Replication] after drop, pool was empty, going to spawn some connections
2020-03-18T14:34:54.465+0800 I ASIO     [Replication] Connecting to 10.1.1.159:27010
......
2020-03-18T14:35:02.473+0800 I ASIO     [Replication] Failed to connect to 10.1.1.159:27010 - HostUnreachable: Error connecting to 10.1.1.159:27010 :: caused by :: Connection refused
2020-03-18T14:35:02.473+0800 I CONNPOOL [Replication] Dropping all pooled connections to 10.1.1.159:27010 due to HostUnreachable: Error connecting to 10.1.1.159:27010 :: caused by :: Connection refused
2020-03-18T14:35:02.473+0800 I REPL_HB  [replexec-8] Error in heartbeat (requestId: 662) to 10.1.1.159:27010, response status: HostUnreachable: Error connecting to 10.1.1.159:27010 :: caused by :: Connection refused
2020-03-18T14:35:04.463+0800 I REPL     [replexec-5] Member 10.1.1.77:27010 is now in state PRIMARY
2020-03-18T14:35:04.473+0800 I ASIO     [Replication] Connecting to 10.1.1.159:27010
2020-03-18T14:35:04.473+0800 I ASIO     [Replication] Failed to connect to 10.1.1.159:27010 - HostUnreachable: Error connecting to 10.1.1.159:27010 :: caused by :: Connection refused
2020-03-18T14:35:04.473+0800 I CONNPOOL [Replication] Dropping all pooled connections to 10.1.1.159:27010 due to HostUnreachable: Error connecting to 10.1.1.159:27010 :: caused by :: Connection refused

架构也就变成了下图：

目前副本集搭建完成，也测试了当一个节点出现问题以后（至少三个节点），并不会影响服务正常读写。线上环境我们需要开启认证，
下一章我们开始添加用户，开启认证授权。

副本集或者复制集介绍：

常见的复制集

下图：1主2从

下图：一主一从一仲裁

服务器信息：

1、我们在其中一台机器配置：

2、将配置负复制到其他机器：

3、三台机器分别执行：

4、在其中一台机器执行：

5、查看节点状态

7、现在副本集状态：

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