centos7高可用keepalived centos7安装keepalived

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mob6454cc6ff2b9 2024-08-01 15:13:00

文章标签 nginx 优先级 html 文章分类 运维

keepalived 类似的还有 lvs

nginx 我的已经安装好，

我的keepalived版本是 2.0.15

两台虚拟机各自安装 nginx 与 keepalived

如果安装nginx 时安装了如下依赖则安装 keppalived 不需要安装，如果没有安装则需要安装如下依赖

出现这种错误则是依赖没有安装完整，

centos7高可用keepalived centos7安装keepalived_nginx

安装依赖：

yum -y install gcc pcre-devel zlib-devel openssl openssl-devel libssl-dev libnl-devel

下载keepalived的方式：

一：

yum install -y keepalived

二：

下载如下 keepalived ，上传至liunx。

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1：进入 keepalived 目录, 解压： tar -zxvf keepalived-2.0.15.tar.gz

解压后：

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2：进入 keepalived-2.0.15，命令： cd keepalived-2.0.15

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3: 安装： ./configure --prefix=/usr/local/keepalived

出现如下界面则安装成功。

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4：在当前目录下执行： make && make install

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5: 配置keepalived服务

cp /usr/local/keepalived/sbin/keepalived /usr/sbin/

cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

mkdir /etc/keepalived //这是keepalived默认加载配置文件的路径

cp /usr/local/keepalived/etc/keepalived/keepalived.conf/etc/keepalived/

6：将keepalived 加入开机启动

systemctl enable keepalived.service 或者 chkconfig keepalived on

7：准备 nginx 启动脚本，下面脚本的意思是：

首先获取nginx的进程数，如果为0 则启动nginx, 在等待两秒后再次查询一次，如果还是为0 则停止 keepalived

1: touch nginx_check.sh 创建一个文件，将下面命令复制进去。将文件放在 /etc/keepalived 此目录与配置文件一个文件夹

#!/bin/bash
     A=`ps -C nginx --no-header |wc -l`
    if [ $A -eq 0 ];then
          /usr/local/nginx/sbin/nginx
          sleep 2
          if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
             killall keepalived
          fi
    fi

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2：给创建的文件赋权。

chmod +x nginx_check.sh

8：修改 /etc/keepalived/keepalived.conf 文件，命令： vim /etc/keepalived/keepalived.conf

将原文件内容清空，将下列命令复制进去，

global_defs {
    router_id 129  #标识节点的字符串，通常为hostname
 } vrrp_script chk_nginx {
     script "/etc/keepalived/nginx_check.sh" #运行脚本，脚本内容下面有，就是起到一个nginx宕机以后，自动开启服务
     interval 2 #检测时间间隔
     weight -20 #如果条件成立的话，则权重 -20
 }
 # 定义虚拟路由，VI_1 为虚拟路由的标示符，自己定义名称
 vrrp_instance VI_1 {
     state BACKUP  #来决定主从  MASTER  BACKUP 两种
     interface ens33 # 绑定虚拟 IP 的网络接口，根据自己的机器填写   ip a 查看
     virtual_router_id 129  # 虚拟路由的 ID 号
     mcast_src_ip 192.168.xx.xx #填写本机ip
     priority 100 # 节点优先级,主要比从节点优先级高
     nopreempt # 优先级高的设置  解决异常恢复后再次抢占的问题， master挂掉，backup升级为master，原master为backup
     advert_int 1 # 组播信息发送间隔，两个节点设置必须一样，默认 1s
     authentication { #pass  ah  推荐使用 pass
         auth_type PASS
         auth_pass 1111
     }
     # 将 track_script 块加入 instance 配置块
     track_script {
         chk_nginx #执行 Nginx 监控的服务
     }    virtual_ipaddress {
         192.168.xx.xx # 虚拟ip,也就是解决写死程序的ip怎么能切换的ip,也可扩展，用途广泛。可配置多个。
     }
 }
 ~
 ~ 
service keepalived start   //启动 keepalived
service keepalived stop  //停止 keepalived
//keepalived加入开机启动
systemctl enable keepalived.service   或者      chkconfig keepalived on

9: 测试；

启动nignx

1：cd /usr/local/nginx/html

2: vim index.html 在如下添加ip 或者标识

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