5.Lvs+Keepalived健康检查-白红宇

5.Lvs+Keepalived健康检查

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发布时间：2019-06-28

本文共 4913 字，大约阅读时间需要 16 分钟。

1. Nginx+keepalived对后端服务器心跳检查(需要自定义脚本)

原理：Keepalived并不跟nginx耦合，它俩完全不是一家人但是keepalived提供一个机制：让用户自定义一个shell脚本去检测用户自己的程序，返回状态给keepalived就可以了

#MASTER节点

global_defs {}vrrp_script chk_health {    script "[[ `ps -ef | grep nginx | grep -v grep | wc -l` -ge 2 ]] && exit 0 || exit 1"    interval 1    #每隔1秒执行上述的脚本，去检查用户的程序ngnix    weight -2}vrrp_instance VI_1 {    state MASTER    interface eth0 virtual_router_id 1 priority 100 advert_int 2 authentication { auth_type PASS auth_pass 1111 } track_script { chk_health } virtual_ipaddress { 10.0.0.10/24 } notify_master "/usr/local/keepalived/sbin/notify.sh master" notify_backup "/usr/local/keepalived/sbin/notify.sh backup" notify_fault "/usr/local/keepalived/sbin/notify.sh fault" }

#添加切换通知脚本：vi /usr/local/keepalived/sbin/notify.sh

#!/bin/bashcase "$1" in    master)        /usr/local/nginx/sbin/nginx        exit 0    ;;backup)        /usr/local/nginx/sbin/nginx -s stop /usr/local/nginx/sbin/nginx exit 0 ;; fault) /usr/local/nginx/sbin/nginx -s stop exit 0 ;; *) echo 'Usage: notify.sh {master|backup|fault}' exit 1 ;; esac

#添加执行权限：chmod +x /usr/local/keepalived/sbin/notify.sh

global_defs {}vrrp_script chk_health {    script "[[ `ps -ef | grep nginx | grep -v grep | wc -l` -ge 2 ]] && exit 0 || exit 1"    interval 1    weight -2}vrrp_instance VI_1 {    state BACKUP    interface eth0 virtual_router_id 1 priority 99 advert_int 1 authentication { auth_type PASS auth_pass 1111 } track_script { chk_health } virtual_ipaddress { 10.0.0.10/24 } notify_master "/usr/local/keepalived/sbin/notify.sh master" notify_backup "/usr/local/keepalived/sbin/notify.sh backup" notify_fault "/usr/local/keepalived/sbin/notify.sh fault" }

#在第二台机器上添加notify.sh脚本

#分别在两台机器上启动keepalived

service keepalived start

chkconfig keepalived on

2. Lvs+keepalived对后端服务器心跳检查(不需要自定义脚本)

　　1. 在两台（192.168.232.201和192.168.232.205） Lvs转发服务器上安装ipvsadm和Keepalived：yum -y install ipvsadm/keepalived

　　 2. 修改配置文件：vi /etc/keepalived/keepalived.conf

　　　　主机：Lvs+keepalived（MASTER）

global_defs {   #指定keepalived在发生切换时需要发送email到的对象   notification_email {       root@localhost    #邮件接收者   }   notification_email_from lvs@localhost  #邮件发送者   smtp_server 127.0.0.1     #邮件服务器地址，如未安装，使用本地   smtp_connect_timeout 30   router_id LVS_DEVEL}#IP漂移协议vrrp_instance VI_1 {    state MASTER   #指定A节点为主节点 备分机上设置为BACKUP即可    interface eth0  #绑定IP漂移的网络接口，在该接口上绑定VIP    virtual_router_id 51   #VRRP组名，两个节点的设置必须一样    priority 100      advert_int 1    authentication {        auth_type PASS        auth_pass 1111    }    virtual_ipaddress {        192.168.232.206/24 dev eth0 label eth0:1   #绑定VIP    }}#只接收80端口过来的请求virtual_server 192.168.232.206 80 {    delay_loop 6    lb_algo wlc   #轮循    lb_kind DR    nat_mask 255.255.255.0    persistence_timeout 50    protocol TCP    #RS服务器1    real_server 192.168.232.200 80 {        weight 1    　　 #健康检查        HTTP_GET {            url {              path /              status_code 200            }            connect_timeout 3            nb_get_retry 3            delay_before_retry 3        }    }    #RS服务器2    real_server 192.168.232.204 80 {        weight 1    　　 #健康检查        HTTP_GET {            url {              path /              status_code 200            }            connect_timeout 3            nb_get_retry 3            delay_before_retry 3        }    }}

　　　　备机：Lvs+keepalived（BACKUP）

global_defs {   #指定keepalived在发生切换时需要发送email到的对象   notification_email {       root@localhost    #邮件接收者   }   notification_email_from lvs@localhost  #邮件发送者   smtp_server 127.0.0.1     #邮件服务器地址，如未安装，使用本地   smtp_connect_timeout 30   router_id LVS_DEVEL}#IP漂移协议vrrp_instance VI_1 {    state BACKUP  #指定A节点为主节点 备分机上设置为BACKUP即可    interface eth0  #绑定IP漂移的网络接口，在该接口上绑定VIP    virtual_router_id 51   #VRRP组名，两个节点的设置必须一样    priority 99      advert_int 1    authentication {        auth_type PASS        auth_pass 1111    }    virtual_ipaddress {        192.168.232.206/24 dev eth0 label eth0:1   #绑定VIP    }}#只接收80端口过来的请求virtual_server 192.168.232.206 80 {
         delay_loop 6    lb_algo wlc   #轮循    lb_kind DR    nat_mask 255.255.255.0    persistence_timeout 50    protocol TCP    #RS服务器1    real_server 192.168.232.200 80 {
             weight 1    　　 #健康检查        HTTP_GET {            url {              path /              status_code 200            }            connect_timeout 3            nb_get_retry 3            delay_before_retry 3        }    }    #RS服务器2    real_server 192.168.232.204 80 {
             weight 1    　　 #健康检查        HTTP_GET {            url {              path /              status_code 200            }            connect_timeout 3            nb_get_retry 3            delay_before_retry 3        }    }}

　　3. 启动两台Lvs转发服务器的Keepalived服务：service keepalived start

　　4.通过ifconfig命令查看主从Lvs转发服务器的网络接口：