nginx+keepalived 主备搭建记录
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()
启动Keepalived并添加到开机自启
systemctl start keepalived
systemctl enable keepalived
4.常用目录及命令
keepalived日志路径
/var/log/messages
keepalived配置文件路径
/etc/keepalived/keepalived.conf
启动keepalived的命令
systemctl start keepalived
重启keepalived的命令
systemctl restart keepalived
停止keepalived的命令
systemctl stop keepalived
keepalived的安装目录
/usr/local/src/keepalived-2.0.18