nginx+keepalived主辅切换

gfrv 发表于 2015-11-20 03:58:05

原创作品，允许转载，转载时请务必以超链接形式标明文章原始出处、作者信息和本声明。否则将追究法律责任。http://deidara.blog.iyunv.com/400447/302402以前写过一篇，nginx+keepalived 双机互备的文章，写那篇文章的时候没有想过如果apache或者nginx 挂了，而 keepalived 或者机器没有死，那么主辅是不会切换的，今天就研究了一下该如何监控 nginx进程呢，看官方站看到了。vrrp_script 功能，但是用他的方法实在形不通，可能是我的方法不对，或者是个BUG。所以后来我自己写了个小脚本来完成工作。环境Server 1:ubuntu-server 8.04.4       192.168.6.162Server 2:userver-server 8.04.4       192.168.6.188软件Keepalived 1.1.15nginx-0.8.35pcre-8.021.分别在两台服务器上安装nginxtar jxvf pcre-8.02.tar.bz2
cd pcre-8.02
./configure --prefix=/usr --enable-utf8 --enable-pcregrep-libbz2 --enable-pcregrep-libz
make
make install
tar zxvf nginx-0.8.35.tar.gz
cd nginx-0.8.35
--prefix=/usr/local/nginx --with-pcre --user=www --group=www --with-file-aio --with-http_ssl_module --with-http_flv_module --with-http_gzip_static_module --with-http_stub_status_module --with-cc-opt=' -O3'
make
make install2.分别在两台服务器编写配置文件vim /usr/local/nginx/conf/nginx.conf
user www www;
worker_processes 1;
error_log logs/error.log notice;
pid             logs/nginx.pid;
events {
   worker_connections 1024;
}
http {
   include          mime.types;
   default_type application/octet-stream;
   sendfile             on;
   tcp_nopush       on;
   keepalive_timeout 65;
   gzip on;
   server {
            listen          80;
            server_name localhost;
            index index.html index.htm;
            root    /var/www;
            error_page 500 502 503 504 /50x.html;
            location = /50x.html {
                     root html;
            }
   }
}
3.分别在两台机器创建测试文件echo "192.168.6.162" > /var/www/index.html
echo "192.168.6.188" > /var/www/index.html4.安装 keepalived apt-get install keepalived5.在server 1服务器编写配置文件vrrp_script chk_http_port {
            script "/opt/nginx_pid.sh"       ###监控脚本
            interval 2                         ###监控时间
            weight 2                            ###目前搞不清楚
}
vrrp_instance VI_1 {
   state MASTER                         ### 设置为主
   interface eth0                         ### 监控网卡
   virtual_router_id 51                ### 这个两台服务器必须一样
   priority 101                               ### 权重值 MASTRE 一定要高于 BAUCKUP
   authentication {
                  auth_type PASS          ### 加密
                  auth_pass eric             ### 加密的密码，两台服务器一定要一样，不然会出错
   }
   track_script {
            chk_http_port                   ### 执行监控的服务
   }
   virtual_ipaddress {
         192.168.6.7                         ### VIP 地址
   }
}
6.在 server 2 服务器 keepalived 配置vrrp_script chk_http_port {
            script "/opt/nginx_pid.sh"
            interval 2
            weight 2
}
vrrp_instance VI_1 {
   state BACKUP                            ### 设置为辅机
   interface eth0
   virtual_router_id 51                      ### 与 MASTRE 设置值一样
   priority 100                                  ### 比 MASTRE权重值低
   authentication {
                  auth_type PASS
                  auth_pass eric                ### 密码与 MASTRE 一样
   }
   track_script {
            chk_http_port
   }
   virtual_ipaddress {
            192.168.6.7
   }
}7.编写监控nginx监控脚本vim /opt/nginx_pid.sh
#!/bin/bash# varsion 0.0.2# 根据一网友说这样做不科学，如果nginx服务起来了，但是我把keepalived 杀掉了，我的理由是，如果nginx死掉了，我觉得就很难在起来，再有就是nagios 当然要给你报警了啊。不过这位同学说的有道理，所以就稍加改了一下脚本
A=`ps -C nginx --no-header |wc -l`             ## 查看是否有 nginx进程把值赋给变量A
if [ $A -eq 0 ];then                                     ## 如果没有进程值得为零             /usr/local/nginx/sbin/nginx             sleep 3             if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then                   killall keepalived                      ## 则结束 keepalived 进程             fi
fi
8、测试,分别在两个服务器启动 nginx 和 keepalived/usr/local/nginx/sbin/nginx
/etc/init.d/keepalived start监控 server 1 的日志Apr 20 18:37:39 nginx Keepalived_vrrp: Registering Kernel netlink command channel
Apr 20 18:37:39 nginx Keepalived_vrrp: Registering gratutious ARP shared channel
Apr 20 18:37:39 nginx Keepalived_vrrp: Opening file '/etc/keepalived/keepalived.conf'.
Apr 20 18:37:39 nginx Keepalived_healthcheckers: Opening file '/etc/keepalived/keepalived.conf'.
Apr 20 18:37:39 nginx Keepalived_healthcheckers: Configuration is using : 3401 Bytes
Apr 20 18:37:39 nginx Keepalived_vrrp: Configuration is using : 35476 Bytes
Apr 20 18:37:40 nginx Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE
Apr 20 18:37:41 nginx Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE
Apr 20 18:37:41 nginx Keepalived_vrrp: Netlink: skipping nl_cmd msg...
Apr 20 18:37:41 nginx Keepalived_vrrp: VRRP_Script(chk_http_port) succeeded监控 server 2的日志 Apr2018:38:23 varnish Keepalived_healthcheckers: Opening file '/etc/keepalived/keepalived.conf'.
Apr 20 18:38:23 varnish Keepalived_healthcheckers: Configuration is using : 3405 Bytes
Apr 20 18:38:23 varnish Keepalived_vrrp: Using MII-BMSR NIC polling thread...
Apr 20 18:38:23 varnish Keepalived_vrrp: Registering Kernel netlink reflector
Apr 20 18:38:23 varnish Keepalived_vrrp: Registering Kernel netlink command channel
Apr 20 18:38:23 varnish Keepalived_vrrp: Registering gratutious ARP shared channel
Apr 20 18:38:23 varnish Keepalived_vrrp: Opening file '/etc/keepalived/keepalived.conf'.
Apr 20 18:38:23 varnish Keepalived_vrrp: Configuration is using : 35486 Bytes
Apr 20 18:38:23 varnish Keepalived_vrrp: VRRP_Instance(VI_1) Entering BACKUP STATE
Apr 20 18:38:25 varnish Keepalived_vrrp: VRRP_Script(chk_http_port) succeeded
看日志可以看出，两台服务器的 MASTRE 和 BACUKUP 已经都正常了现在我们在 server 1 把 nginx 服务器停到Server 1 $> killall nginx这时候看server 1的日志Apr 20 18:41:26 nginx Keepalived_healthcheckers: Terminating Healthchecker child process on signal
Apr 20 18:41:26 nginx Keepalived_vrrp: Terminating VRRP child process on signal
可以看出keepalived 的进程已经停到这时候看server 2的日志，看是否已经接管Apr 20 18:41:23 varnish Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE
Apr 20 18:41:24 varnish Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE
Apr 20 18:41:24 varnish Keepalived_vrrp: Netlink: skipping nl_cmd msg...
很明显的看出 server 2 已经接管了，已经变为 MASTER 了　　本文出自 “linuxer” 博客，请务必保留此出处http://deidara.blog.iyunv.com/400447/302402

页: [1]

运维网's Archiver

nginx+keepalived主辅切换