linux搭建lvs+keepalived+nginx

本是古典何须时尚 2022-05-14 15:53 191阅读 0赞

nginx安装参考：[https://blog.csdn.net/qq\_38270106/article/category/9339417][https_blog.csdn.net_qq_38270106_article_category_9339417]

### **1.下载keepalived** ###

> cd /usr/local && wget http://www.keepalived.org/software/keepalived-1.2.18.tar.gz

### **2.解压安装：** ###

> tar -zxvf keepalived-1.2.18.tar.gz -C /usr/local/

### **3.下载插件openssl（需要安装一个软件包）** ###

> yum install -y openssl openssl-devel

### **4.开始编译keepalived** ###

> cd keepalived-1.2.18/ && ./configure --prefix=/usr/local/keepalived
> 
> make && make install

如果报错: eepalived执行./configure --prefix=/usr/local/keepalived时报错：configure: error: Popt libraries is required

出现此错误的原因：

未安装popt的开发包

解决方法：

yum install popt-devel

安装好popt的开发包。重新./configure 即可。

### 5.keepalived安装成Linux系统服务 ###

将keepalived安装成Linux系统服务，因为没有使用keepalived的默认安装路径（默认路径：/usr/local）,安装完成之后，需要做一些修改工作：

首先创建文件夹，将keepalived配置文件进行复制：

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

然后复制keepalived脚本文件：

> cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
> 
> cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
> 
> ln -s /usr/local/sbin/keepalived /usr/sbin/
> 
> ln -s /usr/local/keepalived/sbin/keepalived /sbin/

可以设置开机启动：**chkconfig keepalived on**，到此我们安装完毕!

*  # **keepalived 常用命令** #

> service keepalived start
> 
> service keepalived restart
> 
> service keepalived stop

> 如果启动报错Starting keepalived (via systemctl):  Job for keepalived.service failed. See 'systemctl status keepalived.service' and 'journalctl -xn' for details. 
> 
> 解决办法
> 
> cd /usr/sbin/ 
> 
> rm -f keepalived  
> 
> cp /usr/local/keepalived/sbin/keepalived  /usr/sbin/

# ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MjcwMTA2_size_16_color_FFFFFF_t_70][] #

### 6.使用keepalived虚拟VIP ###

> cd /etc/keepalived
> 
> rm -rf keepalived.conf
> 
> vi keepalived.conf

! Configuration File for keepalived
    
    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 MASTER # MASTER 主的意思  BACKUP 从
        interface ens33 # 绑定虚拟 IP 的网络接口，根据自己的机器填写
        virtual_router_id 121 # 虚拟路由的 ID 号，随便定义一个数字， 两个节点ID号必须一样
        mcast_src_ip 192.168.128.152 #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 nopreempt 解决异常恢复后再次抢占的问题
        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 {
            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
        }
        ### 虚拟IP地址配置规范 跟本机IP同一网段
        virtual_ipaddress {
            192.168.128.100 # 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。
        }
    }

注意：克隆一台BACKUP虚拟机，需要把state改成BACKUP，和修改ip地址即可

### 7.配置重启nginx的脚本  ###

> vi /etc/keepalived/nginx\_check.sh

放入以下内容：

#!/bin/bash
    A=`ps -C nginx ¨Cno-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

赋权：

> chmod 755 /etc/keepalived/nginx\_check.sh

###  8**.启动nginx和keepalived** ###

> /usr/local/nginx/sbin/nginx
> 
> service keepalived start

**ip addr查看，虚拟出来了一个IP **

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MjcwMTA2_size_27_color_FFFFFF_t_70][]

**访问nginx主页 **

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MjcwMTA2_size_27_color_FFFFFF_t_70 1][]

** 访问虚拟IP主页**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MjcwMTA2_size_27_color_FFFFFF_t_70 2][]

[https_blog.csdn.net_qq_38270106_article_category_9339417]: https://blog.csdn.net/qq_38270106/article/category/9339417
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MjcwMTA2_size_27_color_FFFFFF_t_70 2]: /images/20220503/db77c73d31ed4945be0538c914ea827f.png