Nginx使用Keepalived部署web集群(高可用高性能負載均衡)實戰(zhàn)案例
前言
Keepalived 作為一個高性能的集群高可用解決方案。提供了集群節(jié)點心跳檢測、健康檢查以及故障切換的功能。原生支持 LVS 負載均衡集群。除了原生支持的LVS + Keepalived 外,現在 Nginx + Keepalived 也比較常用。接下來,我將詳細介紹 Nginx + Keepalived。
一、架構設計
負載均衡方案系統(tǒng)架構拓撲圖
二、環(huán)境準備
role | host | ip | software installed | OS |
---|---|---|---|---|
Nginx proxy、Keepalive MASTER | node01 | 192.168.5.11 | Nginx-1.10.0、keepalived | Centos 7.8 |
Nginx proxy、Keepalive BACKUP | node02 | 192.168.5.12 | Nginx-1.10.0、keepalived | Centos 7.8 |
nginx web server1 | node03 | 192.168.5.13 | Nginx-1.18.0 | Centos 7.8 |
nginx web server1 | node04 | 192.168.5.14 | Nginx-1.18.0 | Centos 7.8 |
Client | node05 | 192.168.5.15 | ---- | 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 { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc 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 { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc 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 負載均衡
---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監(jiān)控腳本
---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 服務
---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
客戶端訪問 VIP
實現 Web 服務負載均衡 !
四、測試
node05 添加hosts解析
1、Keepalived 健康檢查
檢測 VIP 訪問 Web 服務
模擬后端服務故障
[root@node04 ~]# systemctl stop nginx [root@node04 ~]# systemctl is-active nginx inactive
檢測 VIP 訪問 Web 服務
模擬后端服務故障恢復
[root@node04 ~]# systemctl start nginx [root@node04 ~]# systemctl is-active nginx active
檢測 VIP 訪問 Web 服務
注:Nginx upstream 模塊默認支持對后端服務健康監(jiān)測,Haproxy 同樣也自帶這種功能!
2、Keepalived MASTER/BACKUP 切換
查看keeapalived VIP 地址狀況
node01
node02
模擬 Keepalived MASTER 故障
[root@node01 ~]# systemctl stop keepalived.service
node01
node02
web 服務訪問不受影響
模擬 Keepalived MASTER 故障恢復
[root@node01 ~]# systemctl start keepalived.service
node01
node02
實現 keeapalived VIP 漂移 !
測試前端 Nginx 負載均衡服務器
node01
Nginx 服務異常后 自動啟動!
node02
Web 訪問不受影響
模擬node01 nginx 服務無法啟動
node01
node02
Web 訪問不受影響
到此這篇關于Nginx使用Keepalived部署web集群(高可用高性能負載均衡)實戰(zhàn)案例的文章就介紹到這了,更多相關Nginx使用Keepalived部署web集群內容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關文章希望大家以后多多支持腳本之家!
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