nginx+keepalived主备双机部署

1. 环境准备

两台服务器10.10.36.30和10.10.36.31
同一网段的虚拟IP：10.10.36.29

2. 安装nginx

安装编译环境

yum -y install gcc pcre pcre-devel zlib zlib-devel openssl openssl-devel

下载安装包并解压

wget https://nginx.org/download/nginx-1.16.1.tar.gz
tar -zxvf nginx-1.16.1.tar.gz

配置编译和安装

./configure --prefix=/usr/local/nginx
make && make install

配置为系统服务

vim /lib/systemd/system/nginx.service

# nginx.service内容如下
[Unit]
Description=nginx service
After=network.target
 
[Service]
Type=forking
ExecStart=/usr/local/nginx/sbin/nginx
ExecReload=/usr/local/nginx/sbin/nginx -s reload
ExecStop=/usr/local/nginx/sbin/nginx -s stop
PrivateTmp=true
[Install]
WantedBy=multi-user.target

# 编辑保存后需重新加载系统服务
systemctl daemon-reload

设置开机启动

# 设置开机启动
systemctl enable nginx.service

服务的常用命令

#启动nginx服务
systemctl start nginx.service　 
 
#停止服务
systemctl stop nginx.service　      
    
#重新启动服务
systemctl restart nginx.service　     
 
#查看服务当前状态
systemctl status nginx.service         
 
#设置开机自启动
systemctl enable nginx.service     

# 停止开机自启动
systemctl disable nginx.service

3. 安装keepalived

用yum命令进行安装

yum install keepalived

#查看是否已经安装上
rpm -q -a keepalived

修改配置文件

# /etc/keepalived目录里面有配置文件keepalived.conf
vim /etc/keepalived/keepalived.conf

# 赋权
chmod 644 /etc/keepalived/keepalived.conf

# keepalived.conf的内容如下
global_defs {
	router_id keep_30	# 唯一标识
}

# 执行nginx是否启动的脚本，未启动则启动nginx，启动失败则杀死keepalived进程
vrrp_script chk_http_port {
	script "/usr/local/src/nginx_check.sh"
	interval 5   # 检测脚本执行的间隔：5s
	weight 5  # 权重，如果这个脚本检测为真，服务器权重+5
}

vrrp_instance VI_1 {
	state MASTER   # 主服务器为MASTER，备份服务器为BACKUP
	interface ens33 # 网卡名称
	virtual_router_id 51 # 主、备机的virtual_router_id必须相同
	priority 100   # 主、备机取不同的优先级，主机值较大，备份机值较小
	advert_int 1   # 每隔1s发送一次心跳
	authentication {	# 校验方式，类型是密码，密码1111
        auth type PASS
        auth pass 1111
    }
	virtual_ipaddress { # 虛拟ip
		10.10.36.29 # 需要与当前服务器属于同一网段
	}
}

创建nginx检测脚本

vim /usr/local/src/nginx_check.sh
chmod 755 /usr/local/src/nginx_check.sh

nginx_check.sh内容如下

#!bin/bash
A=`ps -C nginx --no-header |wc -l`
if [ $A -eq 0 ];then  #如果nginx没在运行
   systemctl start nginx.service  #启动nginx
   sleep 2
   if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then  #如果无法启动
	killall keepalived  #杀死keepalived进程
   fi
fi

设置开机启动
```
systemctl enable keepalived.service
```

常用命令

#启动nginx服务
systemctl start keepalived.service
 
#停止服务
systemctl stop keepalived.service  
    
#重新启动服务
systemctl restart keepalived.service
 
#查看服务当前状态
systemctl status keepalived.service
 
#设置开机自启动
systemctl enable keepalived.service
    
# 停止开机自启动
systemctl disable keepalived.service

4. 定时清理nginx日志

添加系统定时任务

crontab -e

#每天0时1分进行日志分割
01 00 * * * /usr/share/nginx/logs/cut_nginx_log.sh

新建cut_nginx_log.sh脚本

vim /usr/share/nginx/logs/cut_nginx_log.sh
chmod 755 /usr/share/nginx/logs/cut_nginx_log.sh

cut_nginx_log.sh内容如下

#!/bin/bash
#每天00:00执行此脚本 将前一天的access.log重命名为access-xxxx-xx-xx.log格式，并重新打开日志文件
#Nginx日志文件所在目录
LOG_PATH=/usr/local/nginx/logs/
#获取昨天的日期
YESTERDAY=$(date -d "yesterday" +%Y-%m-%d)
#删除文件的日期
SEVENDAY=$(date --date="30 days ago" +%Y-%m-%d)
#获取pid文件路径
PID=/usr/local/nginx/logs/nginx.pid
#分割日志
mv ${LOG_PATH}access.log ${LOG_PATH}access-${YESTERDAY}.log
mv ${LOG_PATH}error.log ${LOG_PATH}error-${YESTERDAY}.log
rm ${LOG_PATH}access-${SEVENDAY}.log
rm ${LOG_PATH}error-${SEVENDAY}.log
#向Nginx主进程发送USR1信号，重新打开日志文件
kill -USR1 `cat ${PID}`

5. 验证

启动两台服务器上的nginx和keepalived

systemctl start nginx.service

systemctl start keepalived.service

在浏览器地址栏输入虚拟ip地址10.10.36.29
把主服务器(10.10.36.30) nginx和keealived停止，再输入虚拟ip地址10.10.36.29
```
systemctl stop keepalived.service

systemctl stop nginx.service
```
以上访问都成功则配置成功

Aether-Lumine

nginx+keepalived主备双机部署

nginx+keepalived主备双机部署

1. 环境准备

2. 安装nginx

3. 安装keepalived

4. 定时清理nginx日志

5. 验证