shell脚本安装部署反向代理 监控进程 计划任务

1.编写脚本自动部署反向代理、web、nfs；

要求：

I、部署nginx反向代理三个web服务，调度算法使用加权轮询；

反向代理服务器脚本配置脚本

#!/bin/bash
#安装eple和nginx
function install(){
    rpm -qa | grep epel &> /dev/null
    if [ $? != 0 ]
        then
            yum install epel -y
    fi
    rpm -qa | grep nginx &> /dev/null
    if [ $? != 0 ]
        then
             yum install nginx -y
    fi
}
#启动nginx
function startng(){
    ps aux | grep nginx | grep -v grep &> /dev/null
    if [ $? -ne 0 ]
        then
            systemctl restart nginx
    fi
}
#调用install（）
install
echo 'install seccussful'

#nginx.conf追加反向代理客户端ip地址和权重
sed -r -i '/http[ ]*\{/a\upstream mynginx {\nserver 192.168.185.137 weight=3;\nserver 192.168.185.138;\nserver 192.168.185.139;\n}' /etc/nginx/nginx.conf
echo 'insert1 ok'

#追加location内容
sed -r -i '/location \/ \{/a\proxy_pass http://mynginx;' /etc/nginx/nginx.conf
echo 'insert1 ok'

#调用startng（）
startng
echo 'start nginx'

反向代理客户端脚本

#!/bin/bash
#安装eple和nginx
function install(){
    rpm -qa | grep epel &> /dev/null
    if [ $? != 0 ]
        then
            yum install epel -y
    fi
    rpm -qa | grep nginx &> /dev/null
    if [ $? != 0 ]
        then
             yum install nginx -y
    fi
}
#启动nginx
function startng(){
    ps aux | grep nginx | grep -v grep &> /dev/null
    if [ $? -ne 0 ]
        then
            systemctl restart nginx
    fi
}
#调用install（）
install
#调用startng（）
startng

II、所有web服务使用共享存储nfs，保证所有web都对其有读写权限，保证数据一致性；

存储服务器脚本

#!/bin/bash
#yum安装nfs和RPC
function install(){
    rpm -qa | grep rpcbind &> /dev/null
    if [ $? != 0 ]
        then
            yum install rpcbind  -y
    fi
    rpm -qa | grep nfs-utils &> /dev/null
    if [ $? != 0 ]
        then
             yum install nfs-utils -y
    fi
}
#调用install（）
install

#新建输出目录share，增加写权限
mkdir  /share_nfs
chmod -R o+w /share_nfs     

#服务端修改配置文件
echo '/share 192.168.185.0/24(rw,sync,fsid=0)'>/etc/exports

#rpcbind和nfs服务开机启动
systemctl enable nfs-server.service
systemctl enable rpcbind.service

#启动rpcbind和nfs服务
function startrn(){
    ps aux | grep nfs-server | grep -v grep &> /dev/null 
    if [ $? -ne 0 ]
        then
            systemctl restart nfs-server.service
    fi
    ps aux | grep rpcbind | grep -v grep &> /dev/null 
    if [ $? -ne 0 ]
        then
            systemctl restart rpcbind.service
    fi
}
#调用startrn（）
startrn

web端脚本

#!/bin/bash
#yum安装nfs和RPC
function install(){
    rpm -qa | grep rpcbind &> /dev/null
    if [ $? != 0 ]
        then
            yum install rpcbind  -y
    fi
    rpm -qa | grep nfs-utils &> /dev/null
    if [ $? != 0 ]
        then
             yum install nfs-utils -y
    fi
}
#调用install（）
install

#rpcbind和nfs服务开机启动
systemctl enable rpcbind.service

#启动rpcbind服务
function startr(){
    ps aux | grep nfs-server | grep -v grep &> /dev/null 
    if [ $? -ne 0 ]
        then
            systemctl restart rpcbind.serive 
    fi
}
#调用startr（）
startr

#挂载服务端／share目录
mount -t nfs 192.168.185.130:/share_nfs /var/www/html/   

2.编写监控脚本，监控nginx，nfs状态，内存、磁盘剩余率检测，异常则发送报警邮件

监控脚本monitor.sh

#!/bin/bash
#monitor nginx
function monitor_nginx(){
    ps aux | grep nginx | grep -v grep &> /dev/null
    if [[ $? -ne 0 ]]
        then
            msg="TIME:$(date +%F_%T)
                 HOSTNAME:$(hostname)
                 IPADDR:$(ifconfig | awk 'NR==2{print $2}')
                 MSG:nginx service stop"
            echo $msg
            /usr/bin/mail $msg
    fi
}

#monitor nfs
function monitor_nfs(){
    ps aux | grep nfs | grep -v grep &> /dev/null
    if [[ $? -ne 0 ]]
        then
            msg="TIME:$(date +%F_%T)
                 HOSTNAME:$(hostname)
                 IPADDR:$(ifconfig | awk 'NR==2{print $2}')
                 MSG:nfs service stop"
            echo $msg
            /usr/bin/mail $msg
    fi
}

mem_limit=20
disk_space_limit=20

#monitor memory
function monitor_mem(){
    mem_total=`free | awk 'NR==2{print $2}'`
    mem_used=`free | awk 'NR==2{print $3}'`
    mem_used_per=`echo "scale=2;$mem_used/$mem_total" |bc -l |cut -d. -f2`
    if [[ mem_used_per -gt $mem_limit ]]
        then
            msg="TIME:$(date +%F_%T)
                 HOSTNAME:$(hostname)
                 IPADDR:$(ifconfig | awk 'NR==2{print $2}')
                 MSG:Memory usage exceeds the limit,current value is ${mem_used_per}%"
            echo $msg
            /usr/bin/mail $msg
    fi
}

function monitor_disk_space(){
    space_use=`df $disk |awk 'NR==2{print $5}'|cut -d% -f1`
    if [[ $space_use -gt $disk_space_limit ]]
        then
            msg="TIME:$(date +%F_%T)
                 HOSTNAME:$(hostname)
                 IPADDR:$(ifconfig |awk 'NR==2{print $2}')
                 MSG:Disk space usage exceeds the limit,current value is ${space_use}%"
            echo $msg
            /usr/bin/mail $msg
    fi
}

monitor_nginx &>> /tmp/monitor.log
monitor_nfs &>> /tmp/monitor.log
monitor_mem &>> /tmp/monitor.log
monitor_disk_space &>> /tmp/monitor.log

准备发送邮件的工具(将下面述文件内容拷贝到/usr/bin/mail并chmod +x /usr/bin/mail)

#!/usr/bin/python
# -*- coding: UTF-8 -*-
import sys
import smtplib
import email.mime.multipart
import email.mime.text

server = 'smtp.163.com'
port = '25'

def sendmail(server,port,user,pwd,msg):
    smtp = smtplib.SMTP()
    smtp.connect(server,port)
    smtp.login(user, pwd)
    smtp.sendmail(msg['from'], msg['to'], msg.as_string())
    smtp.quit()
    print('email has send out !')

if __name__ == '__main__':
    msg = email.mime.multipart.MIMEMultipart()
    msg['Subject'] = 'From your monitor server'
    msg['From'] = 's*****6@163.com'
    msg['To'] = 's*****ve@163.com'
    user = 's*****6'
    pwd = 's*****3'
    content='%s\n%s' %('\n'.join(sys.argv[1:4]),' '.join(sys.argv[4:]))

    txt = email.mime.text.MIMEText(content, _charset='utf-8')
    msg.attach(txt)

    sendmail(server,port,user,pwd,msg)

3.编写计划任务，定时运行监控脚本，完成监控操作

#用户（-u）root身份编辑（-e）计划任务
crontab -e -u root

#* * * * * [命令]  其中，五个星号表示：分钟 小时 日 月 周
25 14 * * 1-5 /shell/monitor.sh  #每周1至周5的14点25分执行monitor脚本

#查看计划任务执行日志
tail -f /var/log/cron