# keepalived与nginx联动-双主 [TOC] ## 一、双主说明 如果一个负载均衡集群中,所有访问都交给主机,一则浪费从机资源,二则增加主机压力,因此可以配置互为主从,即: * A机为www的主机,bbs的备机 * B机为bbs的主机,www的备机 ## 二、配置实现 ### 1. keepalived配置 1) lb01配置[只显示vrrp部分] ```sh cat /etc/keepalived/keepalived.conf vrrp_instance gorup01 { state MASTER interface eth0 virtual_router_id 51 priority 150 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.0.0.3/24 dev eth0 label eth0:1 } } vrrp_instance gorup02 { state BACKUP interface eth0 virtual_router_id 52 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.0.0.4/24 dev eth0 label eth0:1 } } ``` 2) lb02配置[只显示vrrp部分] ```sh cat /etc/keepalived/keepalived.conf vrrp_instance gorup01 { state BACKUP interface eth0 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.0.0.3/24 dev eth0 label eth0:1 } } vrrp_instance gorup02 { state MASTER interface eth0 virtual_router_id 52 priority 150 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.0.0.4/24 dev eth0 label eth0:1 } } ``` ### 2. 修改nginx反向代理监控地址信息 修改lb01,lb02的nginx配置文件中,修改www,bbb主机监控的地址分别为10.0.0.3和10.0.0.4即可,示例如下 ```sh cat /etc/nginx/nginx.conf worker_processes 1; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; upstream noah { server 10.0.0.7:80; server 10.0.0.8:80; server 10.0.0.9:80; } server { listen 10.0.0.3:80; server_name www.etiantian.com; root html; index index.html index.htm; location / { proxy_pass http://noah; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $remote_addr; } } server { listen 10.0.0.4:80; server_name bbs.etiantian.com; root html; index index.html index.htm; location / { proxy_pass http://noah; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $remote_addr; } } } ```