nginx 加 keepalived 高可用

nginx 加keepalived高可用
防火墙全关
开两台nginx

----------------修改主配置文件 -------------------------
在server上写入
upstream httpd1 {
 server 192.168.200.113:80 weight=1;
 server 192.168.200.114:80 weight=1;
}
在location里写入
 proxy_pass http://httpd1;
 proxy_set_header Host $host;
----------------------------------------------------------------

启动nginx 

再分别安装  keepalived
yum -y install keepalived

另外两台 安装 httpd 并开启  systemctl start httpd
-------------------------------------------
分别配置keepalived 主（从）文件
vim /etc/keepalived/keepalived.conf
引入脚本文件
修改
! Configuration File for keepalived
 
vrrp_script check_nginx {
script "/shell/nginx_check.sh"     // 加上脚本
interval 2
 weight -20

global_defs {
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER（BACKUP）
interface eth0    (..)
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
 
track_script {
chk_http_port                           //指定脚本
}
 
virtual_ipaddress {
192.168.200.254                      //虚拟网IP  （访问的网）
}
}
}
-----------------------------------------------------------------
分别创建对应脚本   vim /shell/nginx_check.sh
#！/bin/bash
count="$(ps -C nginx --no-header|wc -l)"

if [ $count -eq 0 ];then
 /usr/local/nginx/sbin/nginx -s restart
 sleep 2
 if [ ps -C nginx --no-header|wc -l -eq 0 ];then
  systemctl stop keepalived
 fi
fi
------------------------------------------------------------------------
加权限给脚本   chmod +x /shell/nginx_check.sh
启动Keepalived  nginx
systemctl start keepalived
重启nginx