linux基础 作业篇

#!/usr/bin/python

#-*- coding:utf-8 -*-

#开发脚本自动部署及监控

#1.编写脚本自动部署反向代理、web、nfs；

#!/bin/bash

#检测安装nginx

function detection_nginx(){

    if [ -f /etc/nginx/nginx.conf ] #判断nginx文件是否存在

        then

            echo 'nginx has been installed'

            exit

    else

        then

            yum install epel-release -y

            yum install nginx -y

            echo 'nginx already installed'

    fi

}

#改写配置文件

function modify_nginx_conf(){

    msg='upstream Pythonweb{ server 192.168.205.129 weight=3;server 192.168.205.129;server 192.168.205.129}'

    sed -ri "/^http/a $msg" /etc/nginx/nginx.conf    #增加upstream

    sed -ri "/^ *location \/ \{$/a proxy_pass http://Pythonweb\;" /etc/nginx/nginx.conf  #修改localtion

}

systemctl reload nginx #重新加载nginx

#检测安装nfs和rpcbind

function detection_nfs(){

    if [ -d /var/lib/nfs ]

        then

            echo 'nfs has been installed'

            exit

    else

        then

            yum install rpcbind nfs-utils -y

            echo 'rpcbind nfs-utils already installed'

    fi

}

function start_service(){

    #创建共享目录

    mkdir /share

    #给用户增加写的权限

    chmod -R o+w /share/

    #改写nfs的配置文件

    echo '/share 192.168.205.0/24(rw,sync,fsid=0)' >> /etc/exports #以追加的方式写入

    #启动服务

    systemctl start rpcbind.server

    systemctl start nfs-utils.server

    #设置开机启动

    systemctl enable nfs-server.service

    systemctl enable rpcbind.service

}

detection_nginx      #执行检测安装nginx函数

modify_nginx_conf   #执行改写nginx.conf函数

detection_nfs        #执行检测安装nfs函数

start_service        #执行启动服务函数

#!/usr/bin/python

#-*- coding:utf-8 -*-

题目：监控主机的内存,超过阈值则发送报警邮件

1.准备发送邮件的代码

#!/usr/bin/python

# -*- coding: UTF-8 -*-

import sys

import smtplib

import email.mime.multipart

import email.mime.text

server = 'smtp.163.com'

port = ''

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('邮件发送成功email has send out !')

if __name__ == '__main__':

    msg = email.mime.multipart.MIMEMultipart()

    msg['Subject'] = '你是风儿我是沙，缠缠绵绵回我家'

    msg['From'] = 'python4_mail@163.com'

    msg['To'] = 'python4_recvmail@163.com'

    user = 'python4_mail'

    pwd = 'sbalex3714'

    content='%s\n%s' %('\n'.join(sys.argv[1:4]),' '.join(sys.argv[4:])) #格式处理，专门针对我们的邮件格式

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

    msg.attach(txt)

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

#把上述代码放在/usr/bin/my_mail 中

vim /usr/bin/my_mail #把代码拷贝到里面

chmod +x my_mail #给文件my_mail 可以执行的权限

2.新建我自己的脚本监控文件15.sh

#!/bin/bash

men = 0 #内存使用超过0%就会报警

function monitor_mem(){

    mem_total = 'free | awk 'NR==2{print $2}'' \

                                            '' \

    mem_use ='free | awk 'NR==2{print $3}''

    mem_per = 'echo "scale=2;$mem_use/$mem_total" |bc -l |cut -d. -f2'

    if [ $mem_per -gt $ mem ]

        then

            msg='TIME:$(date +%F_%T)'

            HOSTNAM:$(hostname)

            IPADDR:$(ifconfig | awk 'NR==2{print $2}')

            echo $msg

            /usr/bin/my_mail $mag

    fi

}

#3.编写计划任务

crontab -e -u root

* * * * * /root/home/gandong/15.sh restart #每一分钟检测一次