keepalived健康检查方式
Keepalived健康检查方式配置HTTP_GET|SSL_GET
HTTP_GET | SSL_GET{url {path /# HTTP/SSL 检查的url 可以是多个digest# HTTP/SSL 检查后的摘要信息 用工具genhash生成status_code 200# HTTP/SSL 检查返回的状态码}connect_port 80 # 连接端口bindto connect_timeout 3 # 连接超时时间nb_get_retry 3 # 重连次数delay_before_retry 2 #连接间隔时间} # END OF HTTP_GET|SSL_GETTCP健康检查方式
TCP_CHECK {connect_timeout 5 #连接超时时间nb_get_retry 3#重连次数delay_before_retry 3 #重连间隔时间connect_port 80 #健康检查的端口} # TCP_CHECKSMTP健康检查方式
SMTP_CHECK {host {connect_ip connect_port# 默认检查端口25}connect_timeout retry delay_before_retry helo_name | # "请求命令参数，可选} #SMTP_CHECKMISC
MISC_CHECK {misc_path |# 外部程序或者脚本路径misc_timeout # 执行脚本的超时时间misc_dynamic#如果设置了misc_dynamic,healthchecker程序的退出状态码会用来动态调整服务器的权重（weight）.#返回0：健康检查OK，权重不被修改#返回1：健康检查失败，权重设为0#返回2-255：健康检查OK，权重设置为：退出状态码-2，比如返回255，那么weight=255-2=253}工具genhash使用
# ./genhash -hgenhash v1.0.0 (18/11, 2002)Usage:./genhash -s server-address -p port -u url./genhash -S -s server-address -p port -u url./genhash -h./genhash -rCommands:Either long or short options are allowed../genhash --use-ssl-SUse SSL connection to remote server../genhash --server-sUse the specified remote server address../genhash --port-pUse the specified remote server port../genhash --url-uUse the specified remote server url../genhash --use-virtualhost -VUse the specified virtualhost in GET query../genhash --verbose-vUse verbose mode output../genhash --help-hDisplay this short inlined help screen../genhash --release-rDisplay the> 工具产生结果如下：
# ./genhash -s10.7.11.12 -p 80 -u http://10.7.11.40/index.htmlMD5SUM = b7bd8391367e4cf9e4e85263ce313ae8 配置如下：
real_server 10.7.11.12 80 {weight 1TCP_CHECK {connect_timeout 5nb_get_retry 3delay_before_retry 3connect_port 80}HTTP_GET {url { path /digest b7bd8391367e4cf9e4e85263ce313ae8status_code 200}#url { #path /mrtg/#digest 9b3a0c85a887a256d6939da88aabd8cd#}connect_timeout 3nb_get_retry 3delay_before_retry 3}} TCP健康检查方式配置例子：
real_server 192.168.191.130 80 {weight 3inhibit_on_failure #在服务器健康检查失效时，将其设为0TCP_CHECK {connect_timeout 5 #连接超时时间nb_get_retry 3#重连次数delay_before_retry 3 #重连间隔时间connect_port 80 #健康检查的端口}} SSL健康检查方式同HTTP，例子如下：
virtual_server 192.168.200.100 443 {delay_loop 6lb_algo rr lb_kind NATpersistence_timeout 50protocol TCPreal_server 192.168.201.100 443 {weight 1SSL_GET {url { path /digest ff20ad2481f97b1754ef3e12ecd3a9cc}url { path /mrtg/digest 9b3a0c85a887a256d6939da88aabd8cd}connect_timeout 3nb_get_retry 3delay_before_retry 3}}} SNMP方式例子：
real_server 172.16.1.12 25 {weight 1SMTP_CHECK {connect_timeout 10retry 2delay_before_retry 5helo_name "foo.bar.com"host {connect_ip 172.16.1.12connect_port 25bindto 172.16.1.2}host {connect_ip192.168.155.11connect_port 25bindto 192.168.155.2}host {connect_ip64.233.167.100connect_port 587}}} MISC方式脚本带参数例子：
real_server 192.168.200.6 1358 {weight 1MISC_CHECK {misc_path "/usr/local/bin/script.sh arg1 arg2"}} MISC方式脚本不带参数例子：
real_server 192.168.200.6 1358 {weight 1MISC_CHECK {misc_path /usr/local/bin/script.sh!misc_dynamic}}
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