linux基础 作业篇

1.自动部署反向代理 web nfs 

#!/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

2.监控主机的内存,超过阈值则发送报警邮件

#!/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 = '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('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