自动化部署nginx负载均衡及监控短信报警

题：
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；
    	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；
    		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；
    2.编写监控脚本，监控集群内所有服务存活状态，内存、磁盘剩余率检测，异常则发送报警邮件
    3.编写计划任务，定时运行监控脚本，完成监控操作
------------------------------------------------------
1、安装nginx及nfs服务端
#!/bin/bash
#insatll nginx proxy
  
IP=`ifconfig |awk -F" " 'NR==2{print $2}'
`  
#insyall nginx proxy
function install_nginx() {
yum remove nginx -y
yum install nginx -y
touch /etc/nginx/conf.d/proxy.conf
cat > /etc/nginx/conf.d/proxy.conf <<EOF
    upstream web {
　　　　　　　　ip_hash; 
        server 192.168.17.126;
        server 192.168.17.127;
    }
    
    server {
　　　　　　　　ip_hash;  
        listen 80;
        server_name $IP;
        location / {
            proxy_pass http://web;
        }
    }
EOF
systemctl start nginx
}
 
#install nfs server
function install_nfs_server() {
yum install rpcbind nfs-utils -y
[ -d /share ] || mkdir  /share && chmod o+w /share
echo "/share 192.168.17.128/24(rw,sync,fsid=0)" > /etc/exports
systemctl start rpcbind.service
systemctl start nfs-server.service
}
while :
do
    read -p "please choice your install server{nginx|nfs}: " server
    if [ $server = "nginx" ]
    then
        install_nginx
    elif [ $server = "nfs" ]
    then
        install_nfs_server
    else
        exit
    fi
done
2、安装客户端nginx-nfs
[root@web01 mnt]# cat install_nginx.sh
#!/bin/bash
#insatll nginx 
  
IP=`ifconfig |awk -F" " 'NR==2{print $2}'`
  
#insyall nginx proxy
function install_nginx() {
yum install nginx -y
echo "welcome to web01" >/usr/share/nginx/html/index.html
systemctl start nginx
}
 
#install nfs server
function install_nfs_server() {
yum install rpcbind nfs-utils -y
systemctl start rpcbind.service
systemctl start nfs-server.service
mount -t nfs 192.168.17.128:/share /usr/share/nginx/html/
}
while :
do
    read -p "please choice your install server{nginx|nfs}: " server
    if [ $server = "nginx" ]
    then
        install_nginx
    elif [ $server = "nfs" ]
    then
        install_nfs_server
    else
        exit
    fi
done
3、编写监控脚本，监控集群内所有服务存活状态，内存、磁盘剩余率检测，异常则发送报警邮件
#!/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
%s' %('
'.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)
2)将监控脚本重命名为mail，拷贝到/usr/bin/mail.赋x权限
3）定时监控脚本
#!/bin/sh  
function ngxMonitor(){  #监控nginx服务
ps aux | grep nginx| grep -v grep &>/dev/null
if [ $? -ne 0 ];then
    msg="TIME:$(date +%F_%T)
         HOSTNAME:$(hostname)
         IPADDR:$(/usr/sbin/ifconfig |awk 'NR==2{print $2}')
         MSG:Nginx program is crash, Waiting to restart"
    echo $msg
    /usr/bin/my_mail $msg
    systemctl restart nginx
fi
}
  
function nfsMonitor(){ #监控nfs服务
ps aux | grep nfs| grep -v grep &>/dev/null
if [ $? -ne 0 ];then
    msg="TIME:$(date +%F_%T)
         HOSTNAME:$(hostname)
         IPADDR:$(/usr/sbin/ifconfig |awk 'NR==2{print $2}')
         MSG:NFS program is crash, Waiting to restart"
    echo $msg
    /usr/bin/my_mail $msg
    systemctl restart nginx
fi
}
  
function memMonitor(){  #监控内存
mem_use=`free | awk 'NR==2{print $3}'`
mem_total=`free | awk 'NR==2{print $2}'`
mem_per=`echo "scale=2;$mem_use/$mem_total"|bc -l |cut -d . -f2`
  
if [ ! -e /usr/bin/bc ];then
    yum install bc -y -q
    echo "bc install successful"
fi
if (( $mem_per > 10 )); then
    msg="TIME:$(date +%F_%T)
         HOSTNAME:$(hostname)
         IPADDR:$(/usr/sbin/ifconfig |awk 'NR==2{print $2}')
         MSG:Memory usage exceeds the limit,current value is ${mem_per}%"
         echo $msg
         /usr/bin/my_mail $msg
fi
}
  
function diskMonitor(){  #监控磁盘
space_use=`df $disk |awk 'NR==2{print $5}'|cut -d% -f1`
  
if [ $space_use -gt 80 ];then
    msg="TIME:$(date +%F_%T)
         HOSTNAME:$(hostname)
         IPADDR:$(/usr/sbin/ifconfig |awk 'NR==2{print $2}')
         MSG:Disk space usage exceeds the limit,current value is ${space_use}%"
    echo $msg
    /usr/bin/my_mail $msg
fi
}
  
  
ngxMonitor  &>>/tmp/monitor.log
nfsMonitor  &>>/tmp/monitor.log
memMonitor  &>>/tmp/monitor.log
diskMonitor &>>/tmp/monitor.log
 
4、计划任务，每天早上9点执行
00 09 * * * /shell/sysCheck.sh
分 时 日 月 周
 