Mongodb 4.2版本副本集配置

時間  2021-04-16
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副本集或者複製集介紹：

•副本集在mongodb中是是一組 mongod保持相同的數據集過程，副本集提供冗餘和高可用性，而且是全部生產部署的基礎。
•複製提供冗餘並增長數據可用性，在不用數據庫服務器上具備多個數據副本是，複製能夠提供一個級別的單一數據庫服務器丟失的容錯能力。
•副本集能夠支撐更高的讀操做，由於客戶端能夠向不一樣的服務器發送讀取操做，能夠配置在不一樣的數據中心用做遭難恢復或者報告，備份。
副本集成員最多50個，只有7個成員能夠參與選舉投票，多中心容災能力，自動恢復，滾動式升級服務linux

常見的複製集

線上環境常見的架構爲副本集，能夠理解爲一主多從。mongodb

下圖：1主2從

Mongodb 4.2版本副本集配置

下圖：一主一從一仲裁

Mongodb 4.2版本副本集配置

服務器信息：

三臺機器同樣配置2核16G內存 存儲盤100G數據庫

"host" : "10.1.1.159:27020"
"host" : "10.1.1.77:27020"
"host" : "10.1.1.178:27020服務器

一、咱們在其中一臺機器配置：

[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：架構

[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                    #若是一臺機器啓動一個實例這個能夠註釋選擇默認，若是一臺機器啓動多個實例，須要設置內存大小，避免互相搶佔內存
        directoryForIndexes: true

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

net:
  port: 27020
  bindIp: 10.1.1.159,localhost      #修改成本機IP地址
  maxIncomingConnections: 5000

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

二、將配置負複製到其餘機器：

[root@10-1-1-159 ~]# scp -r /data/ root@10.1.1.77:/data/
[root@10-1-1-159 ~]# scp -r /data/ root@10.1.1.178:/data/app

目錄結構：curl

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

三、三臺機器分別執行：

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.confide

配置複製集：
#副本集名稱rs02和配置文件中replSetName保持一致測試

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}
    ]
}url

#初始化

rs.initiate(config); 

四、在其中一臺機器執行：

[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)
        }
    }
}

五、查看節點狀態

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",    #主節點
            "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",       #從節點
            "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",     #仲裁節點
            "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>

七、如今副本集狀態：

10.1.1.178:27020 ARBITER 仲裁節點
10.1.1.77:27020 SECONDARY 從節點
10.1.1.159:27020 PRIMARY 主節點

咱們插入一些數據查，而後將主節點停掉，

仲裁節點的日誌
咱們能夠看到，當節點10.1.1.159宕機之後，從新選舉了：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

架構也就變成了下圖：

Mongodb 4.2版本副本集配置

目前副本集搭建完成，也測試了當一個節點出現問題之後（至少三個節點），並不會影響服務正常讀寫。線上環境咱們須要開啓認證，下一章咱們開始添加用戶，開啓認證受權。

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