web服務器php、mysql的健康狀態檢測

有時候php業務的網站突然無法訪問，我們會去查找原因，首先會判斷是不是web服務器掛了，然後再去查詢是不是數據庫掛了，這裏提供一個腳本自動去檢測是web服務器和數據庫服務器，去確定到底是哪個服務器掛掉，並自動去啓動相對應的服務！

# vi check.sh

#!/bin/sh

cd /usr/local/sbin
test -e "checkweb.php" && rm -rf checkweb.php
test -e "checkdb.php" && rm -f checkdb.php
test -e "wget-log" && rm -f wget-log
test -e "wget-log.1" && rm -f wget-log.1

wget -b "http://127.0.0.1/checkweb.php" > /dev/null 2>&1
wget -b "http://127.0.0.1/checkdb.php" > /dev/null 2>&1
sleep 2

checkweb=`cat checkweb.php`
checkdb=`cat checkdb.php`

if 
[ "$checkweb" == "ok" ] ;then
      echo "`date +%d/%m/%Y:%H:%M:%S` - - Webserver successfully!"
    if 
     [ "$checkdb" == "ok" ] ;then
          echo "`date +%d/%m/%Y:%H:%M:%S` - - Mysql connected successfully!"
          echo " "
          echo "-------------------------------------------------------------"
    elif 
     [ "$checkdb" != "ok" ] ;then
          /etc/init.d/mysqld restart
          echo "`date +%d/%m/%Y:%H:%M:%S` - - Mysql connected bad!restart successful!"
          curl "http://sms.api.bz/fetion.php?username=150********&password=******&sendto=150********&message=php連接數據庫失敗，數據庫重啓成功！"
          echo " "
          echo "-------------------------------------------------------------"
     fi
     exit 0
elif 
[ "$checkweb" != "ok" ] ;then
       killall -9 nginx
       /usr/local/nginx/sbin/nginx
       /usr/local/php-fcgi/sbin/php-fpm restart
       echo "`date +%d/%m/%Y:%H:%M:%S` - - Webserver is down!restart successfully!"
       wget -b "http://127.0.0.1/checkdb.php" > /dev/null 2>&1
       sleep 2
       checkdb2=`cat checkdb.php`
     if 
      [ "$checkdb2" == "ok" ] ;then
          echo "`date +%d/%m/%Y:%H:%M:%S` - - Mysql connected successfully!"
          curl "http://sms.api.bz/fetion.php?username=150********&password=******&sendto=150********&message=php服務器down機，重啓成功！"
          echo " "
          echo "-------------------------------------------------------------"
     elif 
      [ "$checkdb2" != "ok" ] ;then
          /etc/init.d/mysqld restart
          echo "`date +%d/%m/%Y:%H:%M:%S` - - Mysql connected bad!restart successful!"
          curl "http://sms.api.bz/fetion.php?username=150********&password=******&sendto=150********&message=php服務器，mysql服務器down機，重啓成功！"
          echo " "
          echo "-------------------------------------------------------------"
     fi
     exit 0

fi

checkweb.php內容:

<?php
echo "ok";
?>;

checkdb.php內容：

<?php
//測試php數據庫鏈接狀態的腳本
$mysql_user = "dbuser";
$mysql_password = "dbpwd";

$link = mysql_connect("localhost",$mysql_user,$mysql_password) or die("bad");
print ("ok");
mysql_close($link);
?>

#crontab -e

*/2 * * * * /usr/local/sbin/check.sh >> /var/log/check.log