centos7下keepalived+nginx配置
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一、系统架构：
角色 内网ip 外网ip
keepalived+nginx 192.168.8.81 192.168.8.201
keepalived+nginx 192.168.8.82 192.168.8.201
web1 192.168.8.83 -
web2 192.168.8.84 -二、nginx配置（两台nginx配置一模一样）：
- 安装：
yum -y install nginx - 配置：
vim /etc/nginx/nginx.confuser nginx; worker_processes auto; error_log /var/log/nginx/error.log; pid /run/nginx.pid; include /usr/share/nginx/modules/*.conf; events { worker_connections 1024; } http { log_format main ‘$remote_addr - $remote_user [$time_local] "$request" ‘ ‘$status $body_bytes_sent "$http_referer" ‘ ‘"$http_user_agent" "$http_x_forwarded_for"‘; access_log /var/log/nginx/access.log main; sendfile on; tcp_nopush on; tcp_nodelay on; keepalive_timeout 65; types_hash_max_size 2048; include /etc/nginx/mime.types; default_type application/octet-stream; include /etc/nginx/conf.d/*.conf; upstream myProxy { server 192.168.8.83:80; server 192.168.8.84:80; } server { listen 80 default_server; listen [::]:80 default_server; server_name _; root /usr/share/nginx/html; include /etc/nginx/default.d/*.conf; location / { proxy_pass http://myProxy; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } error_page 404 /404.html; location = /40x.html { } error_page 500 502 503 504 /50x.html; location = /50x.html { } } } - 启动：
systemctl start nginx三、keepalived配置：
I、主服务器配置（192.168.8.81）：
- 安装：
yum -y install keepalived - 配置：
vim /etc/keepalived/keepalived.conf! Configuration File for keepalived global_defs { } vrrp_script chk_nginx { script "/etc/keepalived/check.sh" interval 1 weight -15 } vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 123456 } virtual_ipaddress { 192.168.8.201 } track_script { chk_nginx } notify_master "/etc/keepalived/notify.sh master" notify_backup "/etc/keepalived/notify.sh backup" notify_fault "/etc/keepalived/notify.sh fault" } - 添加服务检查脚本（check.sh）：
vim /etc/keepalived/check.sh#!/bin/bash # 心跳检测：如果服务还在运行返回0，否则返回1 if [ "`ps -aux | grep nginx | wc -l`" == "0" ] ; then exit 1 else exit 0 fi - 通知脚本（notify.sh）：
vim /etc/keepalived/notify.sh#!/bin/bash # 通知脚本：具体操作 if [ "$1" == "master" ] ; then echo "`date +%F` `date +%T`：切换到主机模式" >> /var/log/keepalived/keepalived.log elif [ "$1" == "backup" ] ; then /usr/bin/systemctl start nginx echo "`date +%F` `date +%T`：切换到备机模式" >> /var/log/keepalived/keepalived.log else /usr/bin/systemctl start nginx echo "`date +%F` `date +%T`：宕机" >> /var/log/keepalived/keepalived.log fi - 给脚本添加可执行权限：
chmod +x /etc/keepalived/check.sh chmod +x /etc/keepalived/notify.sh - 创建日志目录：
mkdir /var/log/keepalived - 启动：
systemctl start keepalivedII、备服务器配置（192.168.8.82）：
- 安装：
yum -y install keepalived - 配置：
vim /etc/keepalived/keepalived.conf! Configuration File for keepalived global_defs { } vrrp_script chk_nginx { script "killall -0 nginx" interval 1 weight -15 } vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 51 priority 99 advert_int 1 authentication { auth_type PASS auth_pass 123456 } virtual_ipaddress { 192.168.8.201 } track_script { chk_nginx } notify_master "/etc/keepalived/notify.sh master" notify_backup "/etc/keepalived/notify.sh backup" notify_fault "/etc/keepalived/notify.sh fault" } - 添加服务检查脚本（check.sh）：
vim /etc/keepalived/check.sh#!/bin/bash # 心跳检测：如果服务还在运行返回0，否则返回1 if [ "`ps -aux | grep nginx | wc -l`" == "0" ] ; then exit 1 else exit 0 fi - 通知脚本（notify.sh）：
vim /etc/keepalived/notify.sh#!/bin/bash # 通知脚本：具体操作 if [ "$1" == "master" ] ; then echo "`date +%F` `date +%T`：切换到主机模式" >> /var/log/keepalived/keepalived.log elif [ "$1" == "backup" ] ; then /usr/bin/systemctl start nginx echo "`date +%F` `date +%T`：切换到备机模式" >> /var/log/keepalived/keepalived.log else /usr/bin/systemctl start nginx echo "`date +%F` `date +%T`：宕机" >> /var/log/keepalived/keepalived.log fi - 给脚本添加可执行权限：
chmod +x /etc/keepalived/check.sh chmod +x /etc/keepalived/notify.sh - 创建日志目录：
mkdir /var/log/keepalived - 启动：
systemctl start keepalived三、测试：
I、测试负载均衡：
II、测试心跳检测（主服务器：192.168.8.81）：
- 停止nginx服务：
systemctl stop nginx - 查看日志：
tail /var/log/keepalived/keepalived.log
原文：http://blog.51cto.com/12173069/2120638
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