010-- 开发脚本自动部署nginx_web和nfs及监控内存

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 ]        
        then
            echo 'nginx has been installed'
            exit
    else
        then 
            yum install epel-release -y
            yum install nginx -y
            echo 'nginx successfully installed'        
    fi    
}

#改写配置文件
function rewrite_nginx_conf(){    
    msg='upstream my_upstream{ server 192.168.19.129;server 192.168.19.130;server 192.168.19.131}'
    sed -ri "/^http/a $msg" /etc/nginx/nginx.conf    #增加upstream
    sed -ri "/^ *location \/ \{$/a proxy_pass http://my_upstream\;" /etc/nginx/nginx.conf  #修改localtion
    #重新加载nginx
    systemctl reload 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 successfully 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 192.168.19.0/24(rw,sync,fsid=0)' >> /etc/exports
    #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
rewrite_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

#!/bin/bash
#检测安装nginx
function detection_nginx(){
    if [ -f /etc/nginx/nginx.conf ]        
        then
            echo 'nginx has been installed'
            exit
    else
        then 
            yum install epel-release -y
            yum install nginx -y
            echo 'nginx successfully installed'        
    fi
}

#改写配置文件
function rewrite_nginx_conf(){
    sed -ri "/^ *location \/ \{$/a root /var/www/html\;index index.html\;" /etc/nginx/nginx.conf
    touch  /var/www/html/index.html
    echo 'web1 hello world' >>  /var/www/html/index.html    #写入文件内容
    systemctl restart 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 successfully installed'        
    fi
}

detection_nginx      #执行检测安装nginx函数
rewrite_nginx_conf   #执行改写nginx.conf函数
detection_nfs        #执行检测安装nfs函数

#挂载共享目录
showmount -e 192.168.19.128
mount -t nfs 192.168.19.128:/share /var/www/html/

2.编写监控脚本，监控集群内所有服务存活状态，内存，异常则发送报警邮件

#!/bin/bash
mem_limit=30 #内存使用超过30%则报警
#监控内存
mem_total=`free |awk 'NR==2{print $2}'`
mem_use=`free |awk 'NR==2{print $3}'`
memory_usage=`echo "scale=2;$mem_use/$mem_total" |bc -l|cut -d. -f2`
IP=`ifconfig |awk 'NR==2{print $2}'`
if [ $memory_usage -gt $mem_limit ]
    then
        msg="TIME:$(date +%F_%T)
            HOSTNAME:$(hostname)
            IPADDR:$IP
            MSG:Memory usage exceeds the limit,current value is ${memory_usage}%"
        echo $msg
        /usr/bin/my_mail $msg

fi 

#!/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'] = '电脑异常邮件，请立即查看'
    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)

3.编写计划任务，定时运行监控脚本，完成监控操作

#!/user/bin/env python
#coding:utf-8
crontab -e -u root

* * * * * /mem.sh restart  #每分钟检测一次

 python2.6.6升级2.7：生产环境

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