shell脚本编写-自动部署及监控

1.编写脚本自动部署反向代理、web、nfs；

I、部署nginx反向代理两个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；

proxy      192.168.11.62     #nginx代理，nfs服务端
web01     192.168. 11.74    #web01,nfs客户端
web02      192.168.11.75    #web02,nfs客户端

#poxy上安装nginx代理，nfs客户端，脚本如下
[root@proxy mnt]# cat install_nginx.sh
#!/bin/bash
#insatll nginx proxy

IP=`ifconfig | awk -F" " '/inet/{print $2}' | head -1`

#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 {
        server 192.168.11.74;
        server 192.168.11.75;
    }

    server {
        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 192.168.11.62/24(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

#web01安装nginx web 和nfs客户端
[root@web01 mnt]# cat install_nginx.sh
#!/bin/bash
#insatll nginx proxy

IP=`ifconfig | awk -F" " '/inet/{print $2}' | head -1`

#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 192.168.11.62:/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

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

步骤一：准备发送邮件的工具

#!/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)

步骤二：将上述文件内容拷贝到/usr/bin/mail并chmod+x /usr/bin/mail

步骤三：然后新建监控脚本servermonitor.sh

#!/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

步骤四：计划任务

* * * * * /shell/sysCheck.sh