nginx+keepalived 主备搭建记录

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#nginx #keepalived

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nginx安装

1.软件安装

nginx version: nginx/1.16.1

nginx安装的服务器： 192.168.4.201/192.168.4.202

yum install -y nginx

2.软件启动

systemctl start nginx

3.查看nginx.conf位置

[root@localhost bin]# nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

5.开机自启动配置

 systemctl enable nginx.service #设置nginx自启动
 systemctl status nginx   #查看nginx状态

七、keepalived安装

ip	keepalived角色	虚拟ip
192.168.4.201	BACKUP	192.168.4.200
192.168.4.202	MASTER	192.168.4.200

1.安装必要的依赖

yum -y install make zlib zlib-devel gcc-c++ libtool  openssl openssl-devel

2.安装keepalived

进入目录

cd /usr/local/src

下载keepalived

wget https://github.com/acassen/keepalived/archive/v2.0.18.tar.gz

解压

tar -zxvf v2.0.18.tar.gz

进入目录

cd keepalived-2.0.18

开始安装

./build_setup

如果出现报错，xxx未找到命令，则执行以下命令安装相应的工具

yum -y install aclocal autoheader automake autoreconf

再次执行命令

./build_setup

编译&&安装

./configure

make && make install

3.配置keepalived

复制相关配置文件到系统默认路径

mkdir /etc/keepalived

cp ./keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

cp ./keepalived/etc/init.d/keepalived /etc/init.d/

cp ./keepalived/etc/sysconfig/keepalived /etc/sysconfig/

修改配置文件

vim /usr/lib/systemd/system/keepalived.service

将PIDFile的值改为/var/run/keepalived.pid

修改keepalived的配置文件

vim /etc/keepalived/keepalived.conf

Master机器(192.168.4.202)的配置文件如下:

!configuration File for keepalived
global_defs {
   router_id nginx_ha
   vrrp_skip_check_adv_addr
   vrrp_garp_interval 0
   vrrp_gna_interval 0
   script_user root
   enable_script_security
   # notification_email
}
vrrp_script chk_nginx {
    # nginx检查脚本的目录
    script "/etc/keepalived/nginx_check.sh" interval 2
    weight 20
}

vrrp_instance VI_1 {
    state MASTER
    interface ens32 
    virtual_router_id 51 
    priority 100 
    advert_int 1 
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        # 虚拟ip地址
        192.168.4.200 
    }
    track_script {
        chk_nginx
    }
    notify_master "/usr/bin/python /etc/keepalived/send_email.py"
}

Backup(192.168.4.201)机器的配置文件如下:

!configuration File for keepalived
global_defs {
   router_id nginx_ha
   vrrp_skip_check_adv_addr
   vrrp_garp_interval 0
   vrrp_gna_interval 0
   script_user root
   enable_script_security
   # notification_email
}
vrrp_script chk_nginx {
    # nginx检查脚本的目录
    script "/etc/keepalived/nginx_check.sh" interval 2
    weight 20
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens32 
    virtual_router_id 51 
    priority 100 
    advert_int 1 
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.4.200
    }
    track_script {
        chk_nginx
    }
    notify_master "/usr/bin/python /etc/keepalived/send_email.py"
}

编写nginx_check脚本

#!/bin/bash
if [ $(ps aux|grep nginx|egrep '(master|worker)' | wc -l ) -eq 0 ];  then
    /usr/sbin/nginx
	sleep 2
	if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
	      /etc/init.d/keepalived stop
	fi
else
	echo "nginx is running"

fi

为脚本添加可执行权限

chmod +x /etc/keepalived/nginx_check.sh

编写send_email.py脚本

#! /usr/bin/env python
# coding=utf-8

from email.mime.text import MIMEText
from email.header import Header
from smtplib import SMTP_SSL

# 邮箱smtp服务器
host_server = '邮箱smtp服务器地址'
# sender为发件人的邮箱
sender = '发件人的邮箱'
# pwd 为邮箱密码
pwd = 'password'
# 发件人的邮箱
sender_cbi_mail = '发件人的邮箱'
# 收件人邮箱
receiver = '收件人的邮箱'

# 邮件的正文内容
mail_content = '你好，目前master的nginx已由172.16.254.102节点切换至本机，请迅速处理！\n \n  本邮件由keepalived自动发送，请勿回复！'
# 邮件标题
mail_title = 'ngxin主备切换告警！'

smtp = SMTP_SSL(host_server)
smtp.set_debuglevel(1)
smtp.ehlo(host_server)
smtp.login(sender, pwd)

msg = MIMEText(mail_content, "plain", 'utf-8')
msg["Subject"] = Header(mail_title, 'utf-8')
msg["From"] = sender_cbi_mail
msg["To"] = receiver

smtp.sendmail(sender_cbi_mail, receiver, msg.as_string())
smtp.quit()