在Ubuntu Server 14.04上配置一个最小的MongoDB副本集

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在Ubuntu Server 14.04上安装MongoDB 3.2.6

  • Import the public key used by the package management system
    • sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv EA312927
  • Create a list file for MongoDB
    • echo "deb http://repo.mongodb.org/apt/ubuntu trusty/mongodb-org/3.2 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.2.list
  • Reload local package database
    • sudo apt-get update
  • Install the MongoDB packages
    • sudo apt-get install -y mongodb-org=3.2.6 mongodb-org-server=3.2.6 mongodb-org-shell=3.2.6 mongodb-org-mongos=3.2.6 mongodb-org-tools=3.2.6

  • Pin a specific version of MongoDB

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    echo "mongodb-org hold" | sudo dpkg --set-selections
    echo "mongodb-org-server hold" | sudo dpkg --set-selections
    echo "mongodb-org-shell hold" | sudo dpkg --set-selections
    echo "mongodb-org-mongos hold" | sudo dpkg --set-selections
    echo "mongodb-org-tools hold" | sudo dpkg --set-selections

  • 修改MongoDB的配置文件/etc/mongod.conf

    • 修改net.bindIp为0.0.0.0
    • 增加配置
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      storage:
        directoryPerDB: true

  • 验证MongoDB是否成功安装

    • sudo service mongod restart
    • mongo

  • Disable Transparent Huge Pages，参考这里

    • Create the init.d script

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      #!/bin/sh
      ### BEGIN INIT INFO
      # Provides:          disable-transparent-hugepages
      # Required-Start:    $local_fs
      # Required-Stop:
      # X-Start-Before:    mongod mongodb-mms-automation-agent
      # Default-Start:     2 3 4 5
      # Default-Stop:      0 1 6
      # Short-Description: Disable Linux transparent huge pages
      # Description:       Disable Linux transparent huge pages, to improve
      #                    database performance.
      ### END INIT INFO

      case $1 in
        start)
          if [ -d /sys/kernel/mm/transparent_hugepage ]; then
            thp_path=/sys/kernel/mm/transparent_hugepage
          elif [ -d /sys/kernel/mm/redhat_transparent_hugepage ]; then
            thp_path=/sys/kernel/mm/redhat_transparent_hugepage
          else
            return 0
          fi

          echo 'never' > ${thp_path}/enabled
          echo 'never' > ${thp_path}/defrag

          unset thp_path
          ;;
      esac

    • Make it executable

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      sudo chmod 755 /etc/init.d/disable-transparent-hugepages

    • Configure your operating system to run it on boot

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      sudo update-rc.d disable-transparent-hugepages defaults

    • 重启OS

配置MongoDB ReplicaSet副本集

副本集结构：

  • 2数据节点，1个仲裁节点

配置步骤

  • 准备2台高配ec2（假设为A、B）和1台低配ec2（假设为C）
  • 在A、B、C上参考上一节的步骤安装MongoDB

  • 在A的Shell中执行mongo命令，然后创建超级管理员

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    $ mongo
    > admin = db.getSiblingDB("admin");
    > admin.createUser({ user: "ethan", pwd: "{ethan的密码}", roles: [{ role: "root", db: "admin" }] });

  • 准备keyfile

    • 生成keyfile
      • openssl rand -base64 755 > rs0.key
    • 上传rs0.key到A、B、C的/etc目录
    • 修改rs0.key的权限和所有者
      • chmod 400 rs0.key
      • chown mongodb:mongodb /etc/rs0.key

  • 修改A、B的配置文件/etc/mongod.conf

    • 增加配置
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      security:
        keyFile: "/etc/rs0.key"
        authorization: enabled

      replication:
        replSetName: rs0

  • 修改C的配置文件/etc/mongod.conf

    • 增加配置

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      security:
        keyFile: "/etc/rs0.key"
        authorization: enabled

      replication:
        replSetName: rs0

    • 修改配置

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      storage:
        journal:
          enabled: false

  • 重启A、B、C上的mongod实例

  • 配置集群

    • 连接A上的mongod实例

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      $ mongo -u ethan -p {ethan的密码} --authenticationDatabase admin

    • 通过下面的命令配置ReplicaSet：

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      > rs.initiate()
      > cfg = rs.conf()
      > cfg.members[0].host = "{A的IP}:27017"
      > rs.reconfig(cfg)
      > rs.add("{B的IP}")
      > rs.addArb("{C的IP}")

      // 等待几秒...
      > rs.status()  // 检查副本集状态

  • 为副本集客户端创建访问账户

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    > use {dbname};
    > db.createUser({ user: "{账户名}", pwd: "{账户密码}", roles: [{ role: "readWrite", db: "{dbname}" }] });

参考