keepalived HTTP_GET健康检查配置

   Keepalived HTTP_GET健康检查配置方式有2种：摘要 和 状态。

 一、摘要

  这种方法当index.html变化，摘要消息需重新计算。

real_server 192.168.36.99 80 {
    weight 1
    HTTP_GET {
       url {
			path /index.html
			digest bfaa334fdd71444e45eca3b7a1679a4a  #http://192.168.36.99/index.html的digest值          
			}
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
    }
}

digest值的获取方法：

>genhash -s 192.168.36.99 -p 80 -u /index.html

MD5SUM = bfaa334fdd71444e45eca3b7a1679a4a

genhash命令：

genhash v1.0.0 (21/07, 2013)

Usage:

  genhash -s server-address -p port -u url

  genhash -S -s server-address -p port -u url

  genhash -h

  genhash -r

Commands:

Either long or short options are allowed.

  genhash --use-ssl         -S       Use SSL connection to remote server.

  genhash --server          -s       Use the specified remote server address.

  genhash --port            -p       Use the specified remote server port.

  genhash --url             -u       Use the specified remote server url.

  genhash --use-virtualhost -V       Use the specified virtualhost in GET query.

  genhash --hash            -H       Use the specified hash algorithm.

  genhash --verbose         -v       Use verbose mode output.

  genhash --help            -h       Display this short inlined help screen.

  genhash --release         -r       Display the release number

Supported hash algorithms:

  MD5 (default)

二、HTTP状态

real_server 192.168.36.99 80 {
    weight 1
    HTTP_GET {
        url {
			path /index.html
			status_code 200      #http://192.168.36.99/index.html的返回状态码
        }
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
    }
}