Ngxin作为一个强大的开源软件是可以先做为高可用集群服务的,这篇博文就介绍一下nginx+Keepalived是如何实现高性能+高可用集群服务的
环境介绍:
硬件: 4台虚拟服务器
系统:CentOS 7.3
软件:Keepalived、Apache、Nginx
IP及主机名
Master
主机名:shiyan1
IP地址:172.18.17.31
Backup
主机名:shiyan2
IP地址:172.18.17.32
Httpd1
主机名:shiyan3
IP地址:172.18.17.33
Httpd2
主机名:shiyan4
IP地址:172.18.17.34
四台服务器初始化配置(四台服务器相同的配置)
关闭防火墙
[root@shiyan~ ]# systemctl disable firewalld [root@shiyan~ ]# systemctl stop firewalld [root@shiyan~ ]# iptables –F
关闭Selinux
[root@shiyan~ ]# vim /etc/selinux/config SELINUX=disabled #保存重启系统生效
安装软件
Master/Backup
[root@shiyan~ ]# yum install keepalived httpd nginx #(Nginx需要单独配置EPEL源)
Httpd1/Httpd2
[root@shiyan~ ]# yum install httpd
Httpd1配置
[root@shiyan3 ~ ]# mkdir -p /app/apache/html/ [root@shiyan3 ~ ]# chown -R apache.apache /app/apache/html/ [root@shiyan3 ~ ]# echo "Apache Server 1" > /app/apache/html/index.html [root@shiyan3 ~ ]# vim /etc/httpd/conf/httpd.conf #此处是更改httpd.conf中的内容,并非添加内容 DocumentRoot "/app/apache/html" #更改为自定义的路径 # # Relax access to content within /var/www. # <Directory "/app/apache"> #更改为自定义的路径 AllowOverride None # Allow open access: Require all granted </Directory> # Further relax access to the default document root: <Directory "/app/apache/html"> #更改为自定义的路径. [root@shiyan3 ~ ]# systemctl restart httpd #测试网站是否正常运行 [root@yum ~ ]# curl http://172.18.17.33 Apache Server 1 #测试成功
Httpd2配置
[root@shiyan4 ~ ]# mkdir -p /app/apache/html/ [root@shiyan4 ~ ]# chown -R apache.apache /app/apache/html/ [root@shiyan4 ~ ]# echo "Apache Server 2" > /app/apache/html/index.html [root@shiyan4 ~ ]# vim /etc/httpd/conf/httpd.conf #此处是更改httpd.conf中的内容,并非添加内容 DocumentRoot "/app/apache/html" #更改为自定义的路径 # # Relax access to content within /var/www. # <Directory "/app/apache"> #更改为自定义的路径 AllowOverride None # Allow open access: Require all granted </Directory> # Further relax access to the default document root: <Directory "/app/apache/html"> #更改为自定义的路径. [root@shiyan4 ~ ]# systemctl restart httpd #测试网站是否正常运行 [root@yum ~ ]# curl http://172.18.17.34 Apache Server 2 #测试成功
Master配置
配置Sorry-Server [root@shiyan1 ~ ]# mkdir -p /app/apache/html/ [root@shiyan1 ~ ]# chown -R apache.apache /app/apache/html/ [root@shiyan1 ~ ]# echo "<h2>Sorry Server 1</h2>" > /app/apache/html/index.html [root@shiyan1 ~ ]# vim /etc/httpd/conf/httpd.conf #此处是更改httpd.conf中的内容,并非添加内容 Listen 8080 DocumentRoot "/app/apache/html" #更改为自定义的路径 # # Relax access to content within /var/www. # <Directory "/app/apache"> #更改为自定义的路径 AllowOverride None # Allow open access: Require all granted </Directory> # Further relax access to the default document root: <Directory "/app/apache/html"> #更改为自定义的路径. [root@shiyan1 ~ ]# systemctl restart http #测试网站是否正常运行 [root@yum ~ ]# curl http://172.18.17.31:8080 <h2>Sorry Server 1</h2> #测试成功 配置Keepalived [root@shiyan1 ~ ]# cp /etc/keepalived/keepalived.conf{,.bak} #备份文件 [root@shiyan1 ~ ]# vim /etc/keepalived/keepalived.conf global_defs { notification_email { root #定义收邮件的用户 } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 172.18.17.31 #定义邮件地址 smtp_connect_timeout 30 router_id node1 #定义节点名称 } vrrp_instance VI_1 { state MASTER #定义节点为主节点模式 interface ens33 #定义使用ens33为VIP网卡 virtual_router_id 51 #定义节点编号 priority 150 #定义优先级 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 172.18.17.30 #定义VIP } } ~ 配置Nginx服务 [root@shiyan1 ~ ]# vim /etc/nginx/nginx.conf #添加nginx集群 upstream websrvs { server 172.18.17.33:80; server 172.18.17.34:80; server 127.0.0.1:8080 backup; } #server 部分的内容需要全部注释掉 [root@shiyan1 ~ ]# vim /etc/nginx/conf.d/default.conf server { listen 80; location / { root html; proxy_pass http://websrvs; index index.html index.htm; } } [root@shiyan1 ~ ]# systemctl restart nginx [root@shiyan1 ~ ]# systemctl restart keepalived [root@shiyan1 ~ ]# systemctl restart httpd
Backup配置
配置Sorry-Server [root@shiyan2 ~ ]# mkdir -p /app/apache/html/ [root@shiyan2 ~ ]# chown -R apache.apache /app/apache/html/ [root@shiyan2 ~ ]# echo "<h2>Sorry Server 2</h2>" > /app/apache/html/index.html [root@shiyan2 ~ ]# vim /etc/httpd/conf/httpd.conf #此处是更改httpd.conf中的内容,并非添加内容 Listen 8080 DocumentRoot "/app/apache/html" #更改为自定义的路径 # # Relax access to content within /var/www. # <Directory "/app/apache"> #更改为自定义的路径 AllowOverride None # Allow open access: Require all granted </Directory> # Further relax access to the default document root: <Directory "/app/apache/html"> #更改为自定义的路径. [root@shiyan2 ~ ]# systemctl restart http #测试网站是否正常运行 [root@yum ~ ]# curl http://172.18.17.31:8080 <h2>Sorry Server 2</h2> #测试成功 配置Keepalived [root@shiyan2 ~ ]# cp /etc/keepalived/keepalived.conf{,.bak} #备份文件 [root@shiyan2 ~ ]# vim /etc/keepalived/keepalived.conf global_defs { notification_email { root #定义收邮件的用户 } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 172.18.17.31 #定义邮件地址 smtp_connect_timeout 30 router_id node1 #定义节点名称 } vrrp_instance VI_1 { state MASTER #定义节点为主节点模式 interface ens33 #定义使用ens33为VIP网卡 virtual_router_id 51 #定义节点编号 priority 150 #定义优先级 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 172.18.17.30 #定义VIP } } ~ 配置Nginx服务 [root@shiyan2 ~ ]# vim /etc/nginx/nginx.conf #添加nginx集群 upstream websrvs { server 172.18.17.33:80; server 172.18.17.34:80; server 127.0.0.1:8080 backup; } #server 部分的内容需要全部注释掉 [root@shiyan2 ~ ]# vim /etc/nginx/conf.d/default.conf server { listen 80; location / { root html; proxy_pass http://websrvs; index index.html index.htm; } } [root@shiyan2 ~ ]# systemctl restart keepalived [root@shiyan2 ~ ]# systemctl restart nginx [root@shiyan2 ~ ]# systemctl restart httpd
测试环境
#默认使用rr算法依次轮询访问后端httpd服务器 [root@yum ~ ]# curl http://172.18.17.30 Apache Server 1 [root@yum ~ ]# curl http://172.18.17.30 Apache Server 2 #关闭后端http1服务,这样只能访问httpd2的服务 [root@yum ~ ]# curl http://172.18.17.30 Apache Server 2 [root@yum ~ ]# curl http://172.18.17.30 Apache Server 2 #关闭两台后端主机的httpd服务,这样因为没有后端服务器所以Master的sorry-server提供服务 [root@yum ~ ]# curl http://172.18.17.30 <h2>Sorry Server 1</h2> #关闭Master测试 [root@yum ~ ]# curl http://172.18.17.30 <h2>Sorry Server 2</h2>
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