keepalived中vrrp_script,track_script,notify的使用方法
可以在keepalived.conf文件中定义的脚本,用以实现某个检测功能;
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例:检测/etc/keepalived目录下down文件是否存在,如果存在则优先级减20,如果不存在表示正常
vrrp_script chk {
script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
interval 1
weight -20
注:这个脚本的作用是用于维护MASTER,使MASTER手动下线
如何调用上面定义的脚本呢?
在vrrp实例中(vrrp_instance VI_1)加上track_script用于追踪脚本
track_script {
chk
}
notify的用法:
notify_master:当当前节点成为master时,通知脚本执行任务(一般用于启动某服务,比如nginx,haproxy等)
notify_backup:当当前节点成为backup时,通知脚本执行任务(一般用于关闭某服务,比如nginx,haproxy等)
notify_fault:当当前节点出现故障,执行的任务;
例:当成为master时启动haproxy,当成为backup时关闭haproxy
notify_master "/etc/keepalived/start_haproxy.sh start"
notify_backup "/etc/keepalived/start_haproxy.sh stop"
一个完整的实例:
MASTER:初始priority为100
BACKUP:初始priority为90
模拟MASTER产生故障:
当检测到/etc/keepalived目录下有down文件时,priority减少20,变为80;低于BACKUP的priority;
此时MASTER变成BACKUP,同时执行notify_backup的脚本文件(关闭haproxy);
同时BACKUP变成MASTER,同时执行notify_master的脚本文件(启动haproxy);
模拟MASTER故障恢复:
当删除/etc/keepalived目录下的down文件时,原MASTER的优先级又变为100,高于原BACKUP的priority;
此时原MASTER由BACKUP又抢占成了MASTER,同时执行notify_master的脚本文件(启动haproxy);
同时原BACKUP由MASTER又变了BACKUP,同时执行notify_backup的脚本文件(关闭haproxy);
MASTER的配置:
global_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id LVS_DEVEL } vrrp_script chk { script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0" interval 1 weight -20 } vrrp_instance VI_1 { state MASTER interface eth2 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.0.22.245 } track_script { chk } notify_master "/etc/keepalived/start_haproxy.sh start" notify_backup "/etc/keepalived/start_haproxy.sh stop"
BACKUP的配置:
global_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id LVS_DEVEL } vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 51 priority 90 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.0.22.245 } notify_master "/etc/keepalived/start_haproxy.sh start" notify_backup "/etc/keepalived/start_haproxy.sh stop" }
start_haproxy.sh的脚本内容:
#!/bin/bash case "$1" in start) /etc/init.d/haproxy start ;; stop) /etc/init.d/haproxy stop ;; restart) /etc/init.d/haproxy stop /etc/init.d/haproxy start *) echo "Usage:$0 start|stop|restart" ;; esac
keepalived检测nginx,当nginx服务不正常时自动降级,当nginx恢复时自动升级:
check_nginx.sh脚本
#!/bin/bash nmap localhost -p 80 | grep "80/tcp open" if [ $? -ne 0 ];then exit 10 fi
notify.sh脚本:
#!/bin/bash VIP=$2 sendmail (){ subject="${VIP}'s server keepalived state is translate" content="`date +'%F %T'`: `hostname`'s state change to master" echo $content | mail -s "$subject" zhengwei.liu@staples.cn } case "$1" in master) nmap localhost -p 80 | grep "80/tcp open" if [ $? -ne 0 ];then /etc/init.d/nginx start fi sendmail ;; backup) nginx_psr=`ps -C nginx --no-header | wc -l` if [ $nginx_psr -ne 0 ];then /etc/init.d/nginx stop fi ;; *) echo "Usage:$0 master|backup VIP" ;; esac
MASTER配置
! Configuration File for keepalived global_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id https } vrrp_script chk_nginx { script "/etc/keepalived/check_nginx.sh" interval 1 weight -20 } vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 54 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 172.16.8.19/25 } track_script { chk_nginx } notify_master "/etc/keepalived/notify.sh master 172.16.8.19" notify_backup "/etc/keepalived/notify.sh backup 172.16.8.19" }
BACKUP配置:
backup无需检测nginx是否正常,默认nginx是未启动的,当升级为MASTER时启动nginx,当降级为BACKUP时关闭
! Configuration File for keepalived global_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id https } vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 54 priority 90 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 172.16.8.19/25 } notify_master "/etc/keepalived/notify.sh master 172.16.8.19" notify_backup "/etc/keepalived/notify.sh backup 172.16.8.19" }
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