CentOS 6.X下配置Keepalived VIP

一、申请内网VIP

1、用户登录控制台选择数据中心后,在Uhost的主标签下点击”弹性IP”功能按钮,点击”申请IP”按钮下的”申请内网IP”。

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2、选择需要申请的内网弹性IP的个数,点击”确定”后完成申请流程。

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3、页面返回后展示申请到的内网弹性IP信息。

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二、安装keepalived

CentOS下直接用yum安装

# yum install -y keepalived

三、配置VIP

先解释下以下步骤中的几个变量(默认使用root权限):

$node1: 服务器A的内网IP

$node2: 服务器B的内网IP

$vip: 内网VIP

服务器A(node1)

1、编辑/etc/keepalived/keepalived.conf

global_defs {
  router_id LVS_DEVEL
}
vrrp_instance VI_1 {
  state MASTER
  interface eth0
  #unicast peer 格式必须完全匹配!否则会起不来,必须写成三行。
  unicast_peer {
        $node2
  }
  virtual_router_id 51
  priority 100 advert_int 1
  authentication {
    auth_type PASS
    auth_pass 1111
  }
  virtual_ipaddress {
        $vip dev eth0
  }
}

2、启动keepalived

# service keepalived start

服务器B(node2)

1、编辑/etc/keepalived/keepalived.conf

global_defs {
  router_id LVS_DEVEL
}
vrrp_instance VI_1 {
  state BACKUP
  interface eth0
  #unicast peer 格式必须完全匹配!否则会起不来,必须写成三行。
  unicast_peer {
      $node1
  }
  virtual_router_id 51
  priority 90
  advert_int 1
  authentication {
    auth_type PASS
    auth_pass 1111
  }
  virtual_ipaddress {
      $vip dev eth0
  }
}

2、启动keepalived

# service keepalived start

四、测试VIP

1、检查系统日志, 观察keepalived是否成功

# tail /var/log/messsages

2、在node1上停止掉keepalived,然后在node1和node2上分别观察IP信息

# service keepalived stop

# ip a