proxysql keepalived那个好用

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编程梦想实现家 2024-09-25 14:15:48

文章标签 nginx 负载均衡 html 文章分类 运维

1. keepalived+nginx实现WEB负载均衡高可用集群

1.1 需求和环境描述
1.2 WEB集群部署
1.3 负载均衡集群部署
1.4 keepalived部署
1.5 测试监控的接口down后keepalived的情况
1.6 测试nginx服务异常时keepalived的情况
1.7 测试chk_down脚本生效后keepalived的情况

1. keepalived+nginx实现WEB负载均衡高可用集群

nginx作为负载均衡设备可以将流量调度到后端WEB集群中，但是nginx本身没有做到高可用，需要结合keepalived技术解决nginx的单点故障问题，因此通常需要nginx结合keepalived技术实现架构的高可用。

1.1 需求和环境描述

高可用nginx设计需求：

使用nginx+keepalived模型时需要监控nginx的状态，当nginx服务异常时，需要降低keepalived的优先级，进行VIP切换，此功能可以通过keepalived的track_script脚本功能实现，后端RS健康状态监测可以由nginx实现。
同时keepalived状态切换时也需要保证nginx进程启动，可以在keepalived状态切换为BACKUP或MASTER时通过notify.sh脚本再次启动一次nginx服务。

环境说明如下：

客户端：地址：192.168.20.1
负载均衡集群

节点1：主机名：nginx-lb01，地址：eth1:192.168.20.19（外部），eth2：192.168.50.19（内部）
节点2：主机名：nginx-lb02，地址：eth1:192.168.20.20（外部），eth2：192.168.50.20（内部）
负载均衡集群对外提供两个虚地址：192.168.20.28和192.168.20.29，其中192.168.20.28的MASTER节点为nginx-lb01，192.168.20.29的MASTER节点为nginx-lb02，前端可以通过DNS轮询把用户请求调度到不同的负载均衡节点上，实现分流互备。

WEB集群

节点1：主机名：nginx02，地址：192.168.50.22
节点2：主机名：nginx03，地址：192.168.50.23

proxysql keepalived那个好用_负载均衡

1.2 WEB集群部署

nginx02节点部署

#1.nginx的配置文件如下：
[root@nginx02 ~]# cat /etc/nginx/conf.d/xuzhichao.conf 
server {
	listen 80 default_server;
	server_name www.xuzhichao.com;
	access_log /var/log/nginx/access_xuzhichao.log access_json;
	charset utf-8,gbk;	
	keepalive_timeout 65;
	
	#防盗链
	valid_referers none blocked server_names *.b.com  b.*  ~\.baidu\.  ~\.google\.;
	
	if ( $invalid_referer ) {
		return 403;	
	}
    
	#浏览器图标
	location = /favicon.ico {
		root /data/nginx/xuzhichao;
	}

	location / {
		root /data/nginx/xuzhichao;
		index index.html index.php;
	}

	location ~ \.php$ {
		root /data/nginx/xuzhichao;

		#fastcgi反向代理
		fastcgi_pass 127.0.0.1:9000;
		fastcgi_index index.php;
		fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
		fastcgi_param HTTPS on;
		fastcgi_hide_header X-Powered-By;
		include fastcgi_params;
	}

	location = /nginx_status {
		access_log off;
		allow 192.168.20.0/24;
		deny all;
		stub_status;
	}
}

#2.nginx工作目录：
[root@nginx02 ~]# ll /data/nginx/xuzhichao/index.html 
-rw-r--r-- 1 nginx nginx 25 Jun 28 00:04 /data/nginx/xuzhichao/index.html
[root@nginx02 ~]# cat /data/nginx/xuzhichao/index.html
node1.xuzhichao.com page

#3.启动nginx服务：
[root@nginx02 ~]# nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
[root@nginx02 ~]# systemctl start nginx.service

#4.负载均衡测试访问情况：
[root@nginx-lb02 ~]# curl -Hhost:www.xuzhichao.com 192.168.50.22
node1.xuzhichao.com page

nginx03节点部署

#1.nginx的配置文件如下：
[root@nginx03 ~]# cat /etc/nginx/conf.d/xuzhichao.conf 
server {
	listen 80 default_server;
	server_name www.xuzhichao.com;
	access_log /var/log/nginx/access_xuzhichao.log access_json;
	charset utf-8,gbk;	
	keepalive_timeout 65;
	
	#防盗链
	valid_referers none blocked server_names *.b.com  b.*  ~\.baidu\.  ~\.google\.;
	
	if ( $invalid_referer ) {
		return 403;	
	}
    
	#浏览器图标
	location = /favicon.ico {
		root /data/nginx/xuzhichao;
	}

	location / {
		root /data/nginx/xuzhichao;
		index index.html index.php;
	}

	location ~ \.php$ {
		root /data/nginx/xuzhichao;

		#fastcgi反向代理
		fastcgi_pass 127.0.0.1:9000;
		fastcgi_index index.php;
		fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
		fastcgi_param HTTPS on;
		fastcgi_hide_header X-Powered-By;
		include fastcgi_params;
	}

	location = /nginx_status {
		access_log off;
		allow 192.168.20.0/24;
		deny all;
		stub_status;
	}
}

#2.nginx工作目录：
[root@nginx03 ~]# ll /data/nginx/xuzhichao/index.html 
-rw-r--r-- 1 nginx nginx 25 Jun 28 00:04 /data/nginx/xuzhichao/index.html
[root@nginx03 ~]# cat /data/nginx/xuzhichao/index.html
node2.xuzhichao.com page

#3.启动nginx服务：
[root@nginx03 ~]# nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
[root@nginx03 ~]# systemctl start nginx.service

#4.负载均衡测试访问情况：
[root@nginx-lb03 ~]# curl -Hhost:www.xuzhichao.com 192.168.50.23
node2.xuzhichao.com page

1.3 负载均衡集群部署

nginx-lb01和nginx-lb02配置文件完全一致：

#1.nginx的配置文件如下：
[root@nginx-lb01 certs]# cat /etc/nginx/conf.d/xuzhichao.conf 
upstream webserver {
	server 192.168.50.22 fail_timeout=5s max_fails=3;
	server 192.168.50.23 fail_timeout=5s max_fails=3;
    keepalive 32;
}

server {
	listen 443 ssl;
	listen 80;
	server_name www.xuzhichao.com;
	access_log /var/log/nginx/access_xuzhichao.log access_json;

	ssl_certificate /etc/nginx/certs/xuzhichao.crt;
	ssl_certificate_key /etc/nginx/certs/xuzhichao.key;
	ssl_session_cache shared:ssl_cache:30m;
	ssl_session_timeout 10m;

	valid_referers none blocked server_names *.b.com  b.*  ~\.baidu\.  ~\.google\.;

	if ( $invalid_referer ) {
		return 403;	
	}
	
    location / {
		
		if ( $scheme = http ) {
			rewrite /(.*) https://www.xuzhichao.com/$1 permanent;
		}

		proxy_pass http://webserver;
		include proxy_params;
	}
}

[root@nginx-lb01 certs]# cat /etc/nginx/proxy_params 
proxy_set_header host $http_host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

proxy_connect_timeout 30;
proxy_send_timeout 60;
proxy_read_timeout 60;										        

proxy_buffering on;
proxy_buffer_size 64k;
proxy_buffers 4 64k;

#2.启动nginx
[root@nginx-lb01 certs]# systemctl start nginx.service

#3.客户端通过分别测试两台负载均衡设备
#测试nginx-lb01负载均衡
[root@xuzhichao ~]# for i in {1..10} ;do curl -k -Hhost:www.xuzhichao.com https://192.168.20.19 ;done
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page

#测试nginx-lb02负载均衡
[root@xuzhichao ~]# for i in {1..10} ;do curl -k -Hhost:www.xuzhichao.com https://192.168.20.20 ;done
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page

1.4 keepalived部署

nginx-lb01节点的keepalived部署如下：

#1.keepalived配置文件：
[root@nginx-lb01 keepalived]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from keepalived@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id keepalived01
   script_user root
   enable_script_security
   vrrp_mcast_group4 224.0.0.19
}

vrrp_script chk_down {
	script "/etc/keepalived/chk_down.sh"    <==检测脚本，可以直接写命令，也可以调用脚本，脚本需要有执行权限，此处表示若/etc/keepalived/down文件存在，则vrrp优先级减少50
	weight -50   <==如果脚本退出状态为1，则触发优先级减少50
	interval 1   <==脚本检测的周期，1s检测一次
	fall 3       <==脚本检测3次都失败则认为检测失败，触发优先级减少50
	rise 3       <==脚本检测3此都成功则认为检测成功，优先级恢复
}

#注意：在检测脚本中减少weight值是不生效的，如果在vrrp_script字段中没有设置weight值，则脚本状态值为1则直接把keepalived状态置为fault状态。
vrrp_script chk_nginx {
	script "/etc/keepalived/chk_nginx.sh"   <==调用检测脚本，脚本需要有执行权限
	interval 5    <==注意：每5秒执行一次脚本, 脚本执行过程不能超过5秒,否则会被中断再次重新运行脚本。
}

vrrp_instance VI_1 {
    state MASTER
    interface eth1
    virtual_router_id 51
    priority 120
    advert_int 3
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.20.28/24 dev eth1
    }

    track_interface {
    	eth2
	eth0
    }

    track_script {
    	chk_down
	chk_nginx
    }

    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}

vrrp_instance VI_2 {
    state BACKUP
    interface eth1
    virtual_router_id 52
    priority 100
    advert_int 3
    authentication {
        auth_type PASS
        auth_pass 2222
    }
    
    virtual_ipaddress {
        192.168.20.29/24 dev eth1
    }
    
    track_interface {
    	eth2
	eth0
    }

    track_script {
    	chk_down
	chk_nginx
    }

    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}


#2.chk_nginx脚本文件：
[root@nginx-lb01 keepalived]# cat /etc/keepalived/chk_nginx.sh 
#!/bin/bash

nginxpid=$(pidof nginx | wc -l) 

#1.判断Nginx是否存活,如果不存活则尝试启动Nginx
if [ $nginxpid -eq 0 ];then 
	systemctl start nginx 
	sleep 2 
	
	#2.等待2秒后再次获取一次Nginx状态 
	nginxpid=$(pidof nginx | wc -l) 
	
	#3.再次进行判断, 如Nginx还不存活则停止Keepalived,让虚地址进行漂移,并退出脚本 
	if [ $nginxpid -eq 0 ];then 
		systemctl stop keepalived
	fi
fi

#3.notify.sh文件：
[root@nginx-lb01 keepalived]# cat /etc/keepalived/notify.sh 
#!/bin/bash

contact='root@localhost'
notify() {
	local mailsubject="$(hostname) to be $1, vip floating"
	local mailbody="$(date +'%F %T'): vrrp transition, $(hostname) changed to be $1"
	echo "$mailbody" | mail -s "$mailsubject" $contact
}

case $1 in
master)
    notify master
	systemctl start nginx   <==keepalived状态切换时触发启动nginx服务，确保nginx服务启动，可用于提供服务
	;;
backup)
	notify backup
	systemctl start nginx
    ;;
fault)
    notify fault
	;;
*)
	echo "Usage: $(basename $0) {master|backup|fault}"
	exit 1
	;;
esac

#4.chk_down脚本：
[root@nginx-lb01 keepalived]# cat /etc/keepalived/chk_down.sh 
#!/bin/bash

[[ ! -f /etc/keepalived/down ]]

#5.增加执行权限：
[root@nginx-lb01 keepalived]# chmod u+x chk_nginx.sh
[root@nginx-lb01 keepalived]# chmod u+x notify.sh
[root@nginx-lb01 keepalived]# chmod u+x chk_down.sh

#5.重启keepalived服务：
[root@nginx-lb01 keepalived]# systemctl restart keepalived.service

#6.查看VIP情况：
[root@nginx-lb01 keepalived]# ip add show eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:33:71:d0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.20.19/24 brd 192.168.20.255 scope global noprefixroute eth1
       valid_lft forever preferred_lft forever
    inet 192.168.20.28/24 scope global secondary eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::f0da:450f:5a80:de8b/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::7f20:c9d7:cb3e:bb8e/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::1a77:baea:91d8:79c7/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

nginx-lb02节点的keepalived部署如下：

#1.keepalived配置文件：
You have new mail in /var/spool/mail/root
[root@nginx-lb02 keepalived]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from keepalived@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id keepalived01
   script_user root
   enable_script_security
   vrrp_mcast_group4 224.0.0.19
}

vrrp_script chk_down {
	script "[[ ! -f /etc/keepalived/down ]]"    <==注意：在centos7.8测试使用这种方式无法生效。需要使用脚本方式。
	weight -50
	interval 1
	fall 3
	rise 3
}

vrrp_script chk_nginx {
	script "/etc/keepalived/chk_nginx.sh"
	interval 5
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth1
    virtual_router_id 51
    priority 100
    advert_int 3
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.20.28/24 dev eth1
    }

    track_interface {
    	eth2
	eth0
    }

    track_script {
    	chk_down
	chk_nginx
    }

    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}

vrrp_instance VI_2 {
    state MASTER
    interface eth1
    virtual_router_id 52
    priority 120
    advert_int 3
    authentication {
        auth_type PASS
        auth_pass 2222
    }
    
    virtual_ipaddress {
        192.168.20.29/24 dev eth1
    }
    
    track_interface {
    	eth2
	eth0
    }

    track_script {
    	chk_down
	chk_nginx
    }

    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}

#2.chk_nginx脚本文件：
[root@nginx-lb02 keepalived]# cat /etc/keepalived/chk_nginx.sh 
#!/bin/bash

nginxpid=$(pidof nginx | wc -l) 

#1.判断Nginx是否存活,如果不存活则尝试启动Nginx
if [ $nginxpid -eq 0 ];then 
	systemctl start nginx 
	sleep 2 
	
	#2.等待2秒后再次获取一次Nginx状态 
	nginxpid=$(pidof nginx | wc -l) 
	
	#3.再次进行判断, 如Nginx还不存活则停止Keepalived,让地址进行漂移,并退出脚本 
	if [ $nginxpid -eq 0 ];then 
		systemctl stop keepalived
	fi 
fi

#3.notify.sh文件：
[root@nginx-lb02 keepalived]# cat /etc/keepalived/notify.sh 
#!/bin/bash

contact='root@localhost'
notify() {
	local mailsubject="$(hostname) to be $1, vip floating"
	local mailbody="$(date +'%F %T'): vrrp transition, $(hostname) changed to be $1"
	echo "$mailbody" | mail -s "$mailsubject" $contact
}

case $1 in
master)
    notify master
	systemctl start nginx   <==keepalived状态切换时触发启动nginx服务，确保nginx服务启动，可用于提供服务
	;;
backup)
	notify backup
	systemctl start nginx
    ;;
fault)
    notify fault
	;;
*)
	echo "Usage: $(basename $0) {master|backup|fault}"
	exit 1
	;;
esac

#4.增加执行权限：
[root@nginx-lb02 keepalived]# chmod u+x chk_nginx.sh
[root@nginx-lb02 keepalived]# chmod u+x notify.sh

#5.重启keepalived服务：
[root@nginx-lb02 keepalived]# systemctl restart keepalived.service

#6.查看VIP情况：
[root@nginx-lb02 keepalived]# ip add show eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:21:9d:5c brd ff:ff:ff:ff:ff:ff
    inet 192.168.20.20/24 brd 192.168.20.255 scope global noprefixroute eth1
       valid_lft forever preferred_lft forever
    inet 192.168.20.29/24 scope global secondary eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::52b0:737b:a3cb:c6a5/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

用客户端测试通过两个VIP访问后端WEB集群

#测试VIP192.168.20.28，此时时通过负载均衡nginx-lb01节点访问
[root@xuzhichao ~]# for i in {1..10} ;do curl -k -Hhost:www.xuzhichao.com https://192.168.20.28 ;done
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page

#测试VIP192.168.20.29，此时时通过负载均衡nginx-lb02节点访问
[root@xuzhichao ~]# for i in {1..10} ;do curl -k -Hhost:www.xuzhichao.com https://192.168.20.29 ;done
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page

1.5 测试监控的接口down后keepalived的情况

把nginx-lb01节点的eth2接口down掉，模拟连接内网的接口故障，此时若VIP不进行切换，则使用192.168.20.28地址的请求会出现问题。

[root@nginx-lb01 keepalived]# ip link set eth2 down
[root@nginx-lb01 keepalived]# ip link show eth2
4: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000
    link/ether 00:0c:29:33:71:da brd ff:ff:ff:ff:ff:ff

此时查看nginx-lb01节点的keepalived日志，发现keepalived状态切换为fault，192.168.20.28这个虚地址被移除，并发送通知消息。

[root@nginx-lb01 ~]# tail -f /var/log/keepalived.log
Jul  9 23:40:52 nginx-lb01 Keepalived_vrrp[1838]: Kernel is reporting: interface eth2 DOWN
Jul  9 23:40:52 nginx-lb01 Keepalived_vrrp[1838]: VRRP_Instance(VI_1) Entering FAULT STATE
Jul  9 23:40:52 nginx-lb01 Keepalived_vrrp[1838]: VRRP_Instance(VI_1) removing protocol VIPs.
Jul  9 23:40:52 nginx-lb01 Keepalived_vrrp[1838]: Opening script file /etc/keepalived/notify.sh
Jul  9 23:40:52 nginx-lb01 Keepalived_vrrp[1838]: VRRP_Instance(VI_1) Now in FAULT state
Jul  9 23:40:54 nginx-lb01 Keepalived_vrrp[1838]: Kernel is reporting: interface eth2 DOWN
Jul  9 23:40:54 nginx-lb01 Keepalived_vrrp[1838]: VRRP_Instance(VI_2) Now in FAULT state
Jul  9 23:40:54 nginx-lb01 Keepalived_vrrp[1838]: Opening script file /etc/keepalived/notify.sh

[root@nginx-lb01 keepalived]# ip add show eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:33:71:d0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.20.19/24 brd 192.168.20.255 scope global noprefixroute eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::f0da:450f:5a80:de8b/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::7f20:c9d7:cb3e:bb8e/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::1a77:baea:91d8:79c7/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
You have new mail in /var/spool/mail/root

查看nginx-lb02节点的keepalived日志，发现它接管了192.168.20.28这个VIP，并发送通知消息。

[root@nginx-lb02 ~]# tail -f /var/log/keepalived.log
Jul  9 23:40:52 nginx-lb02 Keepalived_vrrp[1967]: VRRP_Instance(VI_1) Transition to MASTER STATE
Jul  9 23:40:55 nginx-lb02 Keepalived_vrrp[1967]: VRRP_Instance(VI_1) Entering MASTER STATE
Jul  9 23:40:55 nginx-lb02 Keepalived_vrrp[1967]: VRRP_Instance(VI_1) setting protocol VIPs.
Jul  9 23:40:55 nginx-lb02 Keepalived_vrrp[1967]: Sending gratuitous ARP on eth1 for 192.168.20.28
Jul  9 23:40:55 nginx-lb02 Keepalived_vrrp[1967]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on eth1 for 192.168.20.28

[root@nginx-lb02 keepalived]# ip add show eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:21:9d:5c brd ff:ff:ff:ff:ff:ff
    inet 192.168.20.20/24 brd 192.168.20.255 scope global noprefixroute eth1
       valid_lft forever preferred_lft forever
    inet 192.168.20.29/24 scope global secondary eth1
       valid_lft forever preferred_lft forever
    inet 192.168.20.28/24 scope global secondary eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::52b0:737b:a3cb:c6a5/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
You have new mail in /var/spool/mail/root

此时测试192.168.20.28虚地址可以正常进行调度

[root@xuzhichao ~]# for i in {1..10} ;do curl -k -Hhost:www.xuzhichao.com https://192.168.20.28 ;done
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page

恢复nginx-lb01的eth2口，虚地址192.168.20.28重新回到nginx-lb01节点

[root@nginx-lb01 keepalived]# ip link set eth2 up

[root@nginx-lb01 keepalived]# ip add show eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:33:71:d0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.20.19/24 brd 192.168.20.255 scope global noprefixroute eth1
       valid_lft forever preferred_lft forever
    inet 192.168.20.28/24 scope global secondary eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::f0da:450f:5a80:de8b/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::7f20:c9d7:cb3e:bb8e/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::1a77:baea:91d8:79c7/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

1.6 测试nginx服务异常时keepalived的情况

把nginx-lb01节点的nginx服务停止，发现nginx很快就重新启动了，说明，检测nginx的脚本生效了。

[root@nginx-lb01 keepalived]# systemctl stop nginx.service 

[root@nginx-lb01 keepalived]# systemctl status nginx.service 
● nginx.service - nginx - high performance web server
   Loaded: loaded (/usr/lib/systemd/system/nginx.service; disabled; vendor preset: disabled)
   Active: active (running) since Fri 2021-07-09 23:58:41 CST; 5s ago
     Docs: http://nginx.org/en/docs/
  Process: 2527 ExecStart=/usr/sbin/nginx -c /etc/nginx/nginx.conf (code=exited, status=0/SUCCESS)
  Process: 2526 ExecStartPre=/usr/sbin/nginx -t (code=exited, status=0/SUCCESS)
 Main PID: 2529 (nginx)
   CGroup: /system.slice/nginx.service
           ├─2529 nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf
           └─2531 nginx: worker process

Jul 09 23:58:41 nginx-lb01 systemd[1]: Starting nginx - high performance web server...
Jul 09 23:58:41 nginx-lb01 nginx[2526]: nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
Jul 09 23:58:41 nginx-lb01 nginx[2526]: nginx: configuration file /etc/nginx/nginx.conf test is successful
Jul 09 23:58:41 nginx-lb01 systemd[1]: Failed to parse PID from file /var/run/nginx.pid: Invalid argument
Jul 09 23:58:41 nginx-lb01 systemd[1]: Started nginx - high performance web server.

把nginx-lb01节点的nginx配置文件修改错误，然后再停止nginx服务，让nginx服务无法启动，此时查看nginx-lb01节点的keepalived日志，发现keepalived状态切换为fault，192.168.20.28这个虚地址被移除，并发送通知消息。

[root@nginx-lb01 ~]# tail -f /var/log/keepalived.log 
Jul 10 00:01:48 nginx-lb01 Keepalived_vrrp[2287]: /etc/keepalived/chk_nginx.sh exited with status 127  <==脚本检测失败
Jul 10 00:01:48 nginx-lb01 Keepalived_vrrp[2287]: VRRP_Script(chk_nginx) failed   <==脚本检测失败
Jul 10 00:01:49 nginx-lb01 Keepalived_vrrp[2287]: VRRP_Instance(VI_1) Entering FAULT STATE  <==进入fault状态
Jul 10 00:01:49 nginx-lb01 Keepalived_vrrp[2287]: VRRP_Instance(VI_1) removing protocol VIPs.
Jul 10 00:01:49 nginx-lb01 Keepalived_vrrp[2287]: Opening script file /etc/keepalived/notify.sh
Jul 10 00:01:49 nginx-lb01 Keepalived_vrrp[2287]: VRRP_Instance(VI_1) Now in FAULT state
Jul 10 00:01:51 nginx-lb01 Keepalived_vrrp[2287]: VRRP_Instance(VI_2) Now in FAULT state
Jul 10 00:01:51 nginx-lb01 Keepalived_vrrp[2287]: Opening script file /etc/keepalived/notify.sh
Jul 10 00:01:53 nginx-lb01 Keepalived_vrrp[2287]: /etc/keepalived/chk_nginx.sh exited with status 127
Jul 10 00:01:58 nginx-lb01 Keepalived_vrrp[2287]: /etc/keepalived/chk_nginx.sh exited with status 127  <==每5s检测一次chk_nginx脚本
Jul 10 00:02:03 nginx-lb01 Keepalived_vrrp[2287]: /etc/keepalived/chk_nginx.sh exited with status 127
Jul 10 00:02:08 nginx-lb01 Keepalived_vrrp[2287]: /etc/keepalived/chk_nginx.sh exited with status 127
Jul 10 00:02:13 nginx-lb01 Keepalived_vrrp[2287]: /etc/keepalived/chk_nginx.sh exited with status 127
Jul 10 00:02:18 nginx-lb01 Keepalived_vrrp[2287]: /etc/keepalived/chk_nginx.sh exited with status 127
Jul 10 00:02:23 nginx-lb01 Keepalived_vrrp[2287]: /etc/keepalived/chk_nginx.sh exited with status 127

[root@nginx-lb01 keepalived]# ip add show eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:33:71:d0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.20.19/24 brd 192.168.20.255 scope global noprefixroute eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::f0da:450f:5a80:de8b/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::7f20:c9d7:cb3e:bb8e/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::1a77:baea:91d8:79c7/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

查看nginx-lb02节点的keepalived日志，发现它接管了192.168.20.28这个VIP，并发送通知消息。

[root@nginx-lb02 ~]# tail -f /var/log/keepalived.log
Jul 10 00:01:49 nginx-lb02 Keepalived_vrrp[2208]: VRRP_Instance(VI_1) Transition to MASTER STATE
Jul 10 00:01:52 nginx-lb02 Keepalived_vrrp[2208]: VRRP_Instance(VI_1) Entering MASTER STATE
Jul 10 00:01:52 nginx-lb02 Keepalived_vrrp[2208]: VRRP_Instance(VI_1) setting protocol VIPs.
Jul 10 00:01:52 nginx-lb02 Keepalived_vrrp[2208]: Sending gratuitous ARP on eth1 for 192.168.20.28
Jul 10 00:01:52 nginx-lb02 Keepalived_vrrp[2208]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on eth1 for 192.168.20.28
Jul 10 00:01:52 nginx-lb02 Keepalived_vrrp[2208]: Sending gratuitous ARP on eth1 for 192.168.20.28

[root@nginx-lb02 keepalived]# ip add show eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:21:9d:5c brd ff:ff:ff:ff:ff:ff
    inet 192.168.20.20/24 brd 192.168.20.255 scope global noprefixroute eth1
       valid_lft forever preferred_lft forever
    inet 192.168.20.29/24 scope global secondary eth1
       valid_lft forever preferred_lft forever
    inet 192.168.20.28/24 scope global secondary eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::52b0:737b:a3cb:c6a5/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
You have new mail in /var/spool/mail/root

此时测试192.168.20.28虚地址可以正常进行调度

[root@xuzhichao ~]# for i in {1..10} ;do curl -k -Hhost:www.xuzhichao.com https://192.168.20.28 ;done
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page

此时恢复nginx-lb01节点的nginx配置文件，查看nginx-lb01节点的日志，发现chk_nginx脚本检测成功，nginx服务自动启动，虚地址192.168.20.28重新回到nginx-lb01节点

[root@nginx-lb01 ~]# tail -f /var/log/keepalived.log
Jul 10 00:07:43 nginx-lb01 Keepalived_vrrp[2287]: VRRP_Script(chk_nginx) succeeded   <==脚本检测成功
Jul 10 00:07:44 nginx-lb01 Keepalived_vrrp[2287]: VRRP_Instance(VI_1) Entering BACKUP STATE
Jul 10 00:07:44 nginx-lb01 Keepalived_vrrp[2287]: Opening script file /etc/keepalived/notify.sh
Jul 10 00:07:45 nginx-lb01 Keepalived_vrrp[2287]: VRRP_Instance(VI_2) Entering BACKUP STATE
Jul 10 00:07:45 nginx-lb01 Keepalived_vrrp[2287]: Opening script file /etc/keepalived/notify.sh
Jul 10 00:07:47 nginx-lb01 Keepalived_vrrp[2287]: VRRP_Instance(VI_1) forcing a new MASTER election
Jul 10 00:07:50 nginx-lb01 Keepalived_vrrp[2287]: VRRP_Instance(VI_1) Transition to MASTER STATE
Jul 10 00:07:53 nginx-lb01 Keepalived_vrrp[2287]: VRRP_Instance(VI_1) Entering MASTER STATE
Jul 10 00:07:53 nginx-lb01 Keepalived_vrrp[2287]: VRRP_Instance(VI_1) setting protocol VIPs.
Jul 10 00:07:53 nginx-lb01 Keepalived_vrrp[2287]: Sending gratuitous ARP on eth1 for 192.168.20.28
Jul 10 00:07:53 nginx-lb01 Keepalived_vrrp[2287]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on eth1 for 192.168.20.28
Jul 10 00:07:53 nginx-lb01 Keepalived_vrrp[2287]: Sending gratuitous ARP on eth1 for 192.168.20.28
Jul 10 00:07:53 nginx-lb01 Keepalived_vrrp[2287]: Sending gratuitous ARP on eth1 for 192.168.20.28

[root@nginx-lb01 keepalived]# ip add show eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:33:71:d0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.20.19/24 brd 192.168.20.255 scope global noprefixroute eth1
       valid_lft forever preferred_lft forever
    inet 192.168.20.28/24 scope global secondary eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::f0da:450f:5a80:de8b/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::7f20:c9d7:cb3e:bb8e/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::1a77:baea:91d8:79c7/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

[root@nginx-lb01 keepalived]# systemctl status nginx.service 
● nginx.service - nginx - high performance web server
   Loaded: loaded (/usr/lib/systemd/system/nginx.service; disabled; vendor preset: disabled)
   Active: active (running) since Sat 2021-07-10 00:07:41 CST; 2min 48s ago
     Docs: http://nginx.org/en/docs/
  Process: 3758 ExecStart=/usr/sbin/nginx -c /etc/nginx/nginx.conf (code=exited, status=0/SUCCESS)
  Process: 3757 ExecStartPre=/usr/sbin/nginx -t (code=exited, status=0/SUCCESS)
 Main PID: 3760 (nginx)
   CGroup: /system.slice/nginx.service
           ├─3760 nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf
           └─3762 nginx: worker process

nginx-lb02节点移除虚地址192.168.20.28，进入BACKUP状态

[root@nginx-lb02 ~]# tail -f /var/log/keepalived.log
Jul 10 00:07:47 nginx-lb02 Keepalived_vrrp[2208]: VRRP_Instance(VI_1) Received advert with higher priority 120, ours 100
Jul 10 00:07:47 nginx-lb02 Keepalived_vrrp[2208]: VRRP_Instance(VI_1) Entering BACKUP STATE
Jul 10 00:07:47 nginx-lb02 Keepalived_vrrp[2208]: VRRP_Instance(VI_1) removing protocol VIPs.
Jul 10 00:07:47 nginx-lb02 Keepalived_vrrp[2208]: Opening script file /etc/keepalived/notify.sh

1.7 测试chk_down脚本生效后keepalived的情况

在nginx-lb01节点创建/etc/keepalived/down文件

#1.创建down文件：
[root@nginx-lb01 keepalived]# touch down

#2.查看nginx-lb01节点的keepalived日志，脚本加测失败，降低本节点vrrp优先级，变为BACKUP状态：
[root@nginx-lb01 ~]# tail -f /var/log/keepalived.log 
Jul 10 16:20:28 nginx-lb01 Keepalived_vrrp[18592]: /etc/keepalived/chk_down.sh exited with status 1  <==三次脚本退出状态为1
Jul 10 16:20:29 nginx-lb01 Keepalived_vrrp[18592]: /etc/keepalived/chk_down.sh exited with status 1
Jul 10 16:20:30 nginx-lb01 Keepalived_vrrp[18592]: /etc/keepalived/chk_down.sh exited with status 1
Jul 10 16:20:30 nginx-lb01 Keepalived_vrrp[18592]: VRRP_Script(chk_down) failed    <==判定脚本检测失败
Jul 10 16:20:31 nginx-lb01 Keepalived_vrrp[18592]: VRRP_Instance(VI_1) Changing effective priority from 120 to 70 <==减少vrrp优先级50
Jul 10 16:20:31 nginx-lb01 Keepalived_vrrp[18592]: VRRP_Instance(VI_2) Changing effective priority from 100 to 50 <==减少vrrp优先级50
Jul 10 16:20:31 nginx-lb01 Keepalived_vrrp[18592]: /etc/keepalived/chk_down.sh exited with status 1
Jul 10 16:20:32 nginx-lb01 Keepalived_vrrp[18592]: /etc/keepalived/chk_down.sh exited with status 1
Jul 10 16:20:33 nginx-lb01 Keepalived_vrrp[18592]: /etc/keepalived/chk_down.sh exited with status 1
Jul 10 16:20:34 nginx-lb01 Keepalived_vrrp[18592]: VRRP_Instance(VI_1) Received advert with higher priority 100, ours 70
Jul 10 16:20:34 nginx-lb01 Keepalived_vrrp[18592]: VRRP_Instance(VI_1) Entering BACKUP STATE   <==进入BACKUP状态
Jul 10 16:20:34 nginx-lb01 Keepalived_vrrp[18592]: VRRP_Instance(VI_1) removing protocol VIPs.
Jul 10 16:20:34 nginx-lb01 Keepalived_vrrp[18592]: Opening script file /etc/keepalived/notify.sh
Jul 10 16:20:34 nginx-lb01 Keepalived_vrrp[18592]: /etc/keepalived/chk_down.sh exited with status 1
Jul 10 16:20:35 nginx-lb01 Keepalived_vrrp[18592]: /etc/keepalived/chk_down.sh exited with status 1
Jul 10 16:20:36 nginx-lb01 Keepalived_vrrp[18592]: /etc/keepalived/chk_down.sh exited with status 1
Jul 10 16:20:37 nginx-lb01 Keepalived_vrrp[18592]: /etc/keepalived/chk_down.sh exited with status 1
Jul 10 16:20:38 nginx-lb01 Keepalived_vrrp[18592]: /etc/keepalived/chk_down.sh exited with status 1

#3.本机虚ip移除：
[root@nginx-lb01 keepalived]# ip add show eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:33:71:d0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.20.19/24 brd 192.168.20.255 scope global noprefixroute eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::f0da:450f:5a80:de8b/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::7f20:c9d7:cb3e:bb8e/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::1a77:baea:91d8:79c7/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

查看nginx-lb02节点的情况

#1.查看日志情况，该节点称为MASTER状态，接管了虚IP192.168.20.28
[root@nginx-lb02 ~]# tail -f /var/log/keepalived.log
Jul 10 16:20:34 nginx-lb02 Keepalived_vrrp[3831]: VRRP_Instance(VI_1) forcing a new MASTER election
Jul 10 16:20:37 nginx-lb02 Keepalived_vrrp[3831]: VRRP_Instance(VI_1) Transition to MASTER STATE
Jul 10 16:20:40 nginx-lb02 Keepalived_vrrp[3831]: VRRP_Instance(VI_1) Entering MASTER STATE
Jul 10 16:20:40 nginx-lb02 Keepalived_vrrp[3831]: VRRP_Instance(VI_1) setting protocol VIPs.
Jul 10 16:20:40 nginx-lb02 Keepalived_vrrp[3831]: Sending gratuitous ARP on eth1 for 192.168.20.28
Jul 10 16:20:40 nginx-lb02 Keepalived_vrrp[3831]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on eth1 for 192.168.20.28
Jul 10 16:20:40 nginx-lb02 Keepalived_vrrp[3831]: Sending gratuitous ARP on eth1 for 192.168.20.28
Jul 10 16:20:40 nginx-lb02 Keepalived_vrrp[3831]: Sending gratuitous ARP on eth1 for 192.168.20.28
Jul 10 16:20:40 nginx-lb02 Keepalived_vrrp[3831]: Sending gratuitous ARP on eth1 for 192.168.20.28
Jul 10 16:20:40 nginx-lb02 Keepalived_vrrp[3831]: Sending gratuitous ARP on eth1 for 192.168.20.28
Jul 10 16:20:40 nginx-lb02 Keepalived_vrrp[3831]: Opening script file /etc/keepalived/notify.sh
Jul 10 16:20:45 nginx-lb02 Keepalived_vrrp[3831]: Sending gratuitous ARP on eth1 for 192.168.20.28
Jul 10 16:20:45 nginx-lb02 Keepalived_vrrp[3831]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on eth1 for 192.168.20.28
Jul 10 16:20:45 nginx-lb02 Keepalived_vrrp[3831]: Sending gratuitous ARP on eth1 for 192.168.20.28
Jul 10 16:20:45 nginx-lb02 Keepalived_vrrp[3831]: Sending gratuitous ARP on eth1 for 192.168.20.28
Jul 10 16:20:45 nginx-lb02 Keepalived_vrrp[3831]: Sending gratuitous ARP on eth1 for 192.168.20.28

#2.本机虚IP情况：
[root@nginx-lb02 ~]# ip add show eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:21:9d:5c brd ff:ff:ff:ff:ff:ff
    inet 192.168.20.20/24 brd 192.168.20.255 scope global noprefixroute eth1
       valid_lft forever preferred_lft forever
    inet 192.168.20.29/24 scope global secondary eth1
       valid_lft forever preferred_lft forever
    inet 192.168.20.28/24 scope global secondary eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::52b0:737b:a3cb:c6a5/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

此时测试192.168.20.28虚地址可以正常进行调度

[root@xuzhichao ~]# for i in {1..10} ;do curl -k -Hhost:www.xuzhichao.com https://192.168.20.28 ;done
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page
node1.xuzhichao.com page
node2.xuzhichao.com page

在nginx-lb01节点删除down文件：

#1.删除down文件：
[root@nginx-lb01 keepalived]# rm -f /etc/keepalived/down 

#2.查看nginx-lb01节点日志，显示脚本校测成功，优先级恢复，重新抢占会虚地址192.168.20.28
[root@nginx-lb01 ~]# tail -f /var/log/keepalived.log 
Jul 10 16:33:56 nginx-lb01 Keepalived_vrrp[18592]: VRRP_Script(chk_down) succeeded
Jul 10 16:33:57 nginx-lb01 Keepalived_vrrp[18592]: VRRP_Instance(VI_2) Changing effective priority from 50 to 100
Jul 10 16:33:57 nginx-lb01 Keepalived_vrrp[18592]: VRRP_Instance(VI_1) Changing effective priority from 70 to 120
Jul 10 16:33:59 nginx-lb01 Keepalived_vrrp[18592]: VRRP_Instance(VI_1) forcing a new MASTER election
Jul 10 16:34:02 nginx-lb01 Keepalived_vrrp[18592]: VRRP_Instance(VI_1) Transition to MASTER STATE
Jul 10 16:34:05 nginx-lb01 Keepalived_vrrp[18592]: VRRP_Instance(VI_1) Entering MASTER STATE
Jul 10 16:34:05 nginx-lb01 Keepalived_vrrp[18592]: VRRP_Instance(VI_1) setting protocol VIPs.
Jul 10 16:34:05 nginx-lb01 Keepalived_vrrp[18592]: Sending gratuitous ARP on eth1 for 192.168.20.28
Jul 10 16:34:05 nginx-lb01 Keepalived_vrrp[18592]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on eth1 for 192.168.20.28
Jul 10 16:34:05 nginx-lb01 Keepalived_vrrp[18592]: Sending gratuitous ARP on eth1 for 192.168.20.28
Jul 10 16:34:05 nginx-lb01 Keepalived_vrrp[18592]: Sending gratuitous ARP on eth1 for 192.168.20.28

#3.本机虚IP情况：
[root@nginx-lb01 keepalived]# ip add show eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:33:71:d0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.20.19/24 brd 192.168.20.255 scope global noprefixroute eth1
       valid_lft forever preferred_lft forever
    inet 192.168.20.28/24 scope global secondary eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::f0da:450f:5a80:de8b/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::7f20:c9d7:cb3e:bb8e/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::1a77:baea:91d8:79c7/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

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proxysql keepalived那个好用

proxysql keepalived那个好用

1. keepalived+nginx实现WEB负载均衡高可用集群

1.1 需求和环境描述

1.2 WEB集群部署

1.3 负载均衡集群部署

1.4 keepalived部署

1.5 测试监控的接口down后keepalived的情况

1.6 测试nginx服务异常时keepalived的情况

1.7 测试chk_down脚本生效后keepalived的情况

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