keepalived与nginx安装

Posted 硝烟漫过十八岁

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目的:

  当用户请求访问时,会通过nginx来访问web服务应用,因此我们必须要保证nginx的高可用,要保证nginx的高可用,我们需要通过keepalived来监控nginx,并对外提供1个虚拟的vip当做ip供用户访问,当用户访问时先访问虚拟的ipkeepalive-master,此时keepalive-master会通过脚本程序监控自己本机下的nginx是否启动,如果启动直接访问,如果挂机,keepalive-master会将自身线程杀掉,然后绑定到keepalived-backup备机上,然后备机会接管keepalive-master的工作,继续访问本机上的nginx,以完成用户的本次请求。

下载安装nginx

nginx下载地址:https://nginx.org/download/

下载“nginx-1.9.9.tar.gz”,移动到/usr/local/下。

 
## 解压
https://nginx.org/download/nginx-1.9.9.tar.gz
tar -zxvf nginx-1.9.9.tar.gz

##进入nginx目录
cd nginx-1.9.9
## 配置
yum -y install pcre-devel openssl openssl-devel
./configure --prefix=/usr/local/nginx

# make
make && make install

进入 nginx 目录中

cd /usr/local/nginx/sbin

 

#查看 nginx 版本号

./nginx -v

 

#启动 nginx

./nginx

 

#停止 nginx

./nginx -s stop

 

#重新加载 nginx

./nginx -s reload

 

 

一.准备工作

   1.准备2linux虚拟机,分别安装 jdk,tomcat,nginx,ipvs,keepalived,(详见安装)

  2.设置

     1.虚拟ip: 192.168.25.125

     2.Master主机ip:192.168.25.128 ,nginx 端口:80  tomcat 端口为: 8080

     3backupr主机ip:192.168.25.129 ,nginx 端口:80  tomcat 端口为: 8080

二.在nginx.conf的配置文件中配置tomcat的负载均衡

  进入命令: vim /usr/local/nginx/conf/nginx.conf

   1.128 129 两个节点了配置如下内容:

upstream cc.com {
    server 192.168.25.128:8080;
    server 192.168.25.129:8080;
}

location / {
    proxy_pass  http://cc.com;
}

   2.配置 tomcat的配置文件端口

      进入命令: vim /usr/local/install/tomcat/conf/server.xml

      

    

  3.启动 tomcat

    进入命令: cd /usr/local/install/tomcat/bin/

    启动命令: sh startup.sh

       关闭命令:sh shutdown.sh

    进入命令: cd /usr/local/install/tomcat/logs/ && ll

    查看日志tail -f catalina.out

    

  4.启动nginx

    启动命令:  /usr/local/nginx/sbin/nginx

    

三.Keepalived设置shell脚本

   1.创建脚本文件:  

     进入命令: cd /usr/local/install/keepalived/etc/keepalived && ll

     创建文件:     vim nginxCheck.sh

NGINX=/usr/local/nginx/sbin/nginx
PROT=80
nmap localhost -p $PORT | grep "$PORT/tcp open"

#echo $?
if [ $? -ne 0 ];then
   $NGINX -s stop
   $NGINX
   sleep 3
   nmap localhost -p $PORT | grep "$PORT/tcp open"
   [ $? -ne 0] && cd /usr/local/install/keepalived/sbin && pkill keepalived

   echo "over"
fi

    注意: 要对这个脚本文件设置权限 chmod 777 nginxCheck.sh

   2.keepalived.conf中添加对脚本的调用

     进入命令: cd /usr/local/install/keepalived/etc/keepalived && ll

     编辑命令: vim keepalived.conf

      

     1.vrrp服务器配置前增加:

      vrrp_script chk_http_port {

         script "/usr/local/install/keepalived/etc/keepalived/nginxCheck.sh"

         interval 2

         weight 2

       }

       

    2.vrrp_instance 配置的最后部分添加:

      track_script {

        chk_http_prot

      }

     

   3.启动keepalived

      进入命令:  cd /usr/local/install/keepalived/sbin && ll

      启动命令:    ./keepalived -f /usr/local/install/keepalived/etc/keepalived/keepalived.conf

      

四.测试、访问

  1.测试

    命令: ip add

    

  2.访问

    在地址栏输入:  192.168.25.125

    

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