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；

#!/bin/sh

 ngxStatus=`ps aux | grep -v grep |grep -c nginx`
 function ngxProxyInstall() {
if [ -e /usr/sbin/nginx ];
　　then
    echo "nginx already installed"
    exit 111
else

    yum install epel-release -y -q
    yum install gcc-* glibc-* openssl openssl-devel pcre pcre-devel zlib zlib-devel -y -q
    yum install nginx -y -q
    echo "install nginx successful"
fi

if [ -f /etc/nginx/nginx.conf ];
　　then
    /bin/cp /etc/nginx/nginx.conf /etc/nginx/nginx.conf.bak
    sed -ri '/^http/a\t upstream luchuangao { 
	 server 192.168.126.132 weight=3;
	 server 192.168.126.133;
	 server 192.168.126.134;
	 }' /etc/nginx/nginx.conf
    sed -ri '/^ *location / {/a\t	 proxy_pass http://luchuangao;' /etc/nginx/nginx.conf
    echo "Configuration successful"

fi

if [ $ngxStatus -lt 2 ];
　　then
    systemctl start nginx
    echo "Start nginx successful"
fi
}

function nfsInstall() {
if [ -e /usr/sbin/rpcinfo ];then
    echo "nfs already installed"
    exit 222
else
    yum install rpcbind nfs-utils -y -q
    echo "install NFS successful"
fi

if [ ! -d /share ];
　　then
    mkdir -p /share
    chmod -R o+w /share
fi

echo '/share 192.168.126.0/24(rw,sync,fsid=0)' > /etc/exports
systemctl enable rpcbind.service
systemctl enable nfs-server.service
systemctl start rpcbind.service
systemctl start nfs-server.service
echo "Start NFS successful"
}

 

ngxProxyInstall

nfsInstall

　　

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；

#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 192.168.16.54;
        server 192.168.16.55;
    }
    
    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 192.168.16.128/24(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
 
 
[root@python_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 "python_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 192.168.16.128:/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

　　

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
%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)


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/bash
cpu_limit=0 #cpu使用超过90%则报警,此处我们为了得到报警邮件的实验效果，直接设置成0
mem_limit=0 #内存使用超过90%则报警，同上
disk='/dev/sda1' #需要监控的磁盘名
disk_inode_limit=0 #磁盘inode使用超过90%则报警，同上
disk_space_limit=0 #磁盘空间使用超过90%则报警，同上

function monitor_cpu(){
    cpu_free=`vmstat 1 5 |awk 'NR>=3{x = x + $15} END {print x/5}' |awk -F. '{print $1}'`
    cpu_use=$((100-cpu_free))
    if [ $cpu_use -gt $cpu_limit ]
        then
            msg="TIME:$(date +%F_%T)
                 HOSTNAME:$(hostname)
                 IPADDR:$(ifconfig |awk 'NR==2{print $2}')
                 MSG:CPU usage exceeds the limit,current value is ${cpu_use}%"
            echo $msg
            /usr/bin/mail $msg
    fi
}

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 $mem_limit ]
        then
            msg="TIME:$(date +%F_%T)
                 HOSTNAME:$(hostname)
                 IPADDR:$(ifconfig |awk 'NR==2{print $2}')
                 MSG:Memory usage exceeds the limit,current value is ${mem_per}%"
            echo $msg
            /usr/bin/mail $msg
    fi
}

function monitor_disk_inode(){
    inode_use=`df -i $disk |awk 'NR==2{print $5}' |cut -d% -f1`
    if [ $inode_use -gt $disk_inode_limit ]
        then
            msg="TIME:$(date +%F_%T)
                 HOSTNAME:$(hostname)
                 IPADDR:$(ifconfig |awk 'NR==2{print $2}')
                 MSG:Disk inode usage exceeds the limit,current value is ${inode_use}%"
            echo $msg
            /usr/bin/mail $msg
    fi
}

function monitor_disk_space(){
    space_use=`df $disk |awk 'NR==2{print $5}'|cut -d% -f1`
    if [ $space_use -gt $disk_space_limit ]
        then
            msg="TIME:$(date +%F_%T)
                 HOSTNAME:$(hostname)
                 IPADDR:$(ifconfig |awk 'NR==2{print $2}')
                 MSG:Disk space usage exceeds the limit,current value is ${space_use}%"
            echo $msg
            /usr/bin/mail $msg
    fi
}

monitor_cpu &>> /tmp/monitor.log
monitor_mem &>> /tmp/monitor.log
monitor_disk_inode &>> /tmp/monitor.log
monitor_disk_space &>> /tmp/monitor.log

步骤四：编写计划任务

* * * * * /root/servermonitor.sh