Web集群案例实战

2024-07-10 21:21| 来源: 网络整理| 查看: 265

Nginx + Keepalived 高可用高性能负载均衡案例实战前言一、架构设计二、环境准备三、案例部署一、测试1、Keepalived 健康检查2、Keepalived MASTER/BACKUP 切换

前言

Keepalived 作为一个高性能的集群高可用解决方案。提供了集群节点心跳检测、健康检查以及故障切换的功能。原生支持 LVS 负载均衡集群。除了原生支持的LVS + Keepalived 外，现在 Nginx + Keepalived 也比较常用。接下来，我将详细介绍 Nginx + Keepalived。

一、架构设计

负载均衡方案系统架构拓扑图在这里插入图片描述

二、环境准备 rolehostipsoftware installedOSNginx proxy、Keepalive MASTERnode01192.168.5.11Nginx-1.10.0、keepalivedCentos 7.8Nginx proxy、Keepalive BACKUPnode02192.168.5.12Nginx-1.10.0、keepalivedCentos 7.8nginx web server1node03192.168.5.13Nginx-1.18.0Centos 7.8nginx web server1node04192.168.5.14Nginx-1.18.0Centos 7.8Clientnode05192.168.5.15----Centos 7.8 三、案例部署

配置前端 Keepalived

---node01 [root@node01 ~]# vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { [email protected] [email protected] [email protected] } notification_email_from [email protected] smtp_server 192.168.5.10 smtp_connect_timeout 30 router_id LVS_DEVEL1 } vrrp_script check_nginx_service { script "/etc/keepalived/check_web_server_keepalive.sh" #script "killall -0 nginx" interval 2 } vrrp_instance VI_1 { state MASTER interface ens33 virtual_router_id 51 priority 200 advert_int 1 authentication { auth_type PASS auth_pass 1111 } track_script { check_nginx_service } virtual_ipaddress { 192.168.5.100 } } [root@node01 ~]# systemctl restart keepalived.service ---node02 ! Configuration File for keepalived global_defs { notification_email { [email protected] [email protected] [email protected] } notification_email_from [email protected] smtp_server 192.168.5.10 smtp_connect_timeout 30 router_id LVS_DEVEL2 } vrrp_script check_nginx_service { script "/etc/keepalived/check_web_server_keepalive.sh" #script "killall -0 nginx" interval 2 } vrrp_instance VI_1 { state BACKUP interface ens33 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } track_script { check_nginx_service } virtual_ipaddress { 192.168.5.100 } } [root@node02 ~]# systemctl restart keepalived.service

配置前端 Nginx 负载均衡

---node01 [root@node01 ~]# mv /etc/nginx/conf.d/default.conf{,.bak} [root@node01 ~]# vim /etc/nginx/conf.d/vhost.conf upstream nginx_keepalived_webservers { server 192.168.5.13:80 weight=1; server 192.168.5.14:80 weight=1; } server{ listen 80; server_name wan.ngin_keepalived.org; location / { proxy_set_header X-Forwarded-For $remote_addr; proxy_pass http://nginx_keepalived_webservers; } } [root@node01 ~]# systemctl restart nginx node02 [root@node02 ~]# mv /etc/nginx/conf.d/default.conf{,.bak} [root@node02 ~]# vim /etc/nginx/conf.d/vhost.conf upstream nginx_keepalived_webservers { server 192.168.5.13:80 weight=1; server 192.168.5.14:80 weight=1; } server{ listen 80; server_name wan.ngin_keepalived.org; location / { proxy_set_header X-Forwarded-For $remote_addr; proxy_pass http://nginx_keepalived_webservers; } } [root@node02 ~]# systemctl restart nginx

配置前端 Nginx监控脚本

---node01 [root@node01 ~]# vim /etc/keepalived/check_web_server_keepalive.sh #!/bin/bash http_status=`ps -C nginx --no-header | wc -l` if [ $http_status -eq 0 ];then systemctl start nginx sleep 3 if [ `ps -C nginx --no-header | wc -l` -eq 0 ] then systemctl stop keepalived fi fi [root@node02 ~]# vim /etc/keepalived/check_web_server_keepalive.sh #!/bin/bash http_status=`ps -C nginx --no-header | wc -l` if [ $http_status -eq 0 ];then systemctl start nginx sleep 3 if [ `ps -C nginx --no-header | wc -l` -eq 0 ] then systemctl stop keepalived fi fi

配置后端 web 服务

---node03 [root@node03 ~]# yum install nginx-1.18.0-1.el7.ngx.x86_64.rpm -y [root@node03 ~]# echo "`hostname -I` web test page..." > /usr/share/nginx/html/index.html [root@node03 ~]# systemctl enable --now nginx ----node04 [root@node04 ~]# yum install nginx-1.18.0-1.el7.ngx.x86_64.rpm -y [root@node04 ~]# echo "`hostname -I` web test page..." > /usr/share/nginx/html/index.html [root@node04 ~]# systemctl enable --now nginx

客户端访问 VIP 在这里插入图片描述实现 Web 服务负载均衡！