安装MongoDB并配置成复制集合

By | 2022年4月26日
目录
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MongoDB 是一个基于分布式文件存储的数据库。由 C++ 语言编写。旨在为 WEB 应用提供可扩展的高性能数据存储解决方案。
MongoDB 是一个介于关系数据库和非关系数据库之间的产品,是非关系数据库当中功能最丰富,最像关系数据库的。

安装

1. 在两台服务器上安装MongoDB并配置成复制集合

1.1 创建yum repo文件(node1, node2)

# vim /etc/yum.repos.d/mongodb-org-3.4.repo

[mongodb-org-3.4]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.4/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-3.4.asc

1.2 安装MongoDB packages(node1, node2)

# sudo yum install -y mongodb-org

1.3 配置SELinux(node1, node2)

有3种选择:

  • 如果SELinux处于enforcing模式:

    # mongodb的端口号为27017的情况,请根据实际情况修改
    semanage port -a -t mongod_port_t -p tcp 27017
  • 关闭SELinux:

    # vim /etc/selinux/config
    SELINUX=disabled
  • 设置SELinux处于permissive 模式:

    # vim /etc/selinux/config
    SELINUX=permissive

1.4 配置MongoDB(node1, node2)

# vim /etc/mongod.conf

systemLog:
  destination: file
  logAppend: true
  path: /var/log/mongodb/mongod.log

storage:
  dbPath: /var/lib/mongo
  journal:
    enabled: true

processManagement:
  fork: true  # fork and run in background
  pidFilePath: /var/run/mongodb/mongod.pid  # location of pidfile

net:
  # 按照自己的需求修改
  port: 27017

operationProfiling:
   slowOpThresholdMs: 200
   mode: slowOp

replication:
   oplogSizeMB: 2048
   replSetName: catalog

1.5 启动MongoDB服务

systemctl restart mongod

1.6 初始化MongoDB(node1)

先来看一下初始化用的config,进入db终端后拷贝输入即可。

config ={
    "_id" : "catalog",
    "members": [
        {
            "_id": 0,
            "host" : "node1:27017"
        },
        {
            "_id": 1,
            "host" : "node2:27018"
        }
    ]
    }

此处的2701727018是对应配置文件中指定的端口号,node1node2需要修改成自己的服务器的host名或ip。
"_id" : "catalog"中的catalog是配置文件中replSetName的值。

进入MongoDB操作命令行,依次输入:

  • config = {…}
  • rs.initiate(config)
  • rs.status()

    # mongo -host 127.0.0.1 -port <配置文件指定的port>
    MongoDB shell version v3.4.9
    connecting to: mongodb://127.0.0.1:27017
    MongoDB server version: 3.4.9
    Server has startup warnings: 
    2017-10-20T17:58:46.781+0800 I CONTROL  [initandlisten] 
    2017-10-20T17:58:46.781+0800 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
    2017-10-20T17:58:46.781+0800 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
    2017-10-20T17:58:46.781+0800 I CONTROL  [initandlisten] 
    2017-10-20T17:58:46.781+0800 I CONTROL  [initandlisten] 
    2017-10-20T17:58:46.781+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
    2017-10-20T17:58:46.781+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
    2017-10-20T17:58:46.781+0800 I CONTROL  [initandlisten] 
    2017-10-20T17:58:46.781+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
    2017-10-20T17:58:46.781+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
    2017-10-20T17:58:46.781+0800 I CONTROL  [initandlisten] 
    > 
    > 
    > 
    > config ={
    ...     "_id" : "catalog",
    ...     "members": [
    ...         {
    ...             "_id": 0,
    ...             "host" : "node1:27017"
    ...         },
    ...         {
    ...             "_id": 1,
    ...             "host" : "node2:27017"
    ...         }
    ...     ]
    ... }
    {
      "_id" : "catalog",
      "members" : [
          {
              "_id" : 0,
              "host" : "node1:27017"
          },
          {
              "_id" : 1,
              "host" : "node2:27017"
          }
      ]
    }
    > 
    > rs.initiate(config)
    {
          "info" : "Config now saved locally.  Should come online in about a minute.",  
          "ok" : 1
    }
    >   
    catalog:PRIMARY> 
    catalog:PRIMARY> 
    catalog:PRIMARY>
    catalog:PRIMARY> rs.status()
    {
      "set" : "catalog",
      "date" : ISODate("2017-10-20T10:20:53.549Z"),
      "myState" : 1,
      "term" : NumberLong(4),
      "heartbeatIntervalMillis" : NumberLong(2000),
      "optimes" : {
          "lastCommittedOpTime" : {
              "ts" : Timestamp(1508494845, 1),
              "t" : NumberLong(4)
          },
          "appliedOpTime" : {
              "ts" : Timestamp(1508494845, 1),
              "t" : NumberLong(4)
          },
          "durableOpTime" : {
              "ts" : Timestamp(1508494845, 1),
              "t" : NumberLong(4)
          }
      },
      "members" : [
          {
              "_id" : 0,
              "name" : "node1:27017",
              "health" : 1,
              "state" : 1,
              "stateStr" : "PRIMARY",
              "uptime" : 1327,
              "optime" : {
                  "ts" : Timestamp(1508494845, 1),
                  "t" : NumberLong(4)
              },
              "optimeDate" : ISODate("2017-10-20T10:20:45Z"),
              "electionTime" : Timestamp(1508493663, 1),
              "electionDate" : ISODate("2017-10-20T10:01:03Z"),
              "configVersion" : 1,
              "self" : true
          },
          {
              "_id" : 1,
              "name" : "node2:27018",
              "health" : 1,
              "state" : 2,
              "stateStr" : "SECONDARY",
              "uptime" : 1196,
              "optime" : {
                  "ts" : Timestamp(1508494845, 1),
                  "t" : NumberLong(4)
              },
              "optimeDurable" : {
                  "ts" : Timestamp(1508494845, 1),
                  "t" : NumberLong(4)
              },
              "optimeDate" : ISODate("2017-10-20T10:20:45Z"),
              "optimeDurableDate" : ISODate("2017-10-20T10:20:45Z"),
              "lastHeartbeat" : ISODate("2017-10-20T10:20:51.727Z"),
              "lastHeartbeatRecv" : ISODate("2017-10-20T10:20:52.810Z"),
              "pingMs" : NumberLong(0),
              "syncingTo" : "node1:27017",
              "configVersion" : 1
          }
      ],
      "ok" : 1
      }

    可以通过rs.add(host:port)来增加member,rs.remove(host:port)来删除member

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