Restart httpd on fail

Crusader · Aug 4, 2007

I'm using this script (I think I got it off of WHT) to restart httpd whenever a file failed to download on my server.

Code:

#!/bin/bash

FILE=http://www.domain.tld/test.file

rm -f test.file
wget -q $FILE -O test.file

if [ ! -f test.file ]
then
       /etc/init.d/httpd restart
       echo 'ALERT - HTTPD restarted on:' `date` | mail -s "Alert: HTTPD Restarted" [email protected]
fi

exit $?

I have it on crontab

Code:

*/5 * * * * /bin/nfup > /dev/null 2>&1

but it didn't seem to restart httpd, I got no e-mail and our site was down for several hours.

Is there anything wrong with the script?

Thanks

cef · Aug 4, 2007

I'm guessing you don't have write permissions for test.file, wherever your script is trying to dump it. Add an absolute path to a location where you have write permissions.

Code:

rm -f [b]/path/you/can/write/to/[/b]test.file
wget -q $FILE -O [b]/path/you/can/write/to/[/b]test.file

if [ ! -f [b]/path/you/can/write/to/[/b]test.file ]

You might also need to set umask at the start of the script to make sure you can read/write the file as well, but try the above first.

Peter · Aug 4, 2007

It is also possible that the user running the script does not have permissions to restart the service (you could see what user is running the process by doing a whoami command within the script).

Out of interest why are you using a php script, why not just use a bash script?

Crusader · Aug 4, 2007

The cron was running as ROOT and i've seen the file show up before. Someone on WHT suggested I use this:

Code:

#!/bin/sh
FILE=http://www.domain.tld/test.file
wget -q $FILE

if [ ! -f test.file ]

then
/etc/init.d/httpd restart
echo 'ALERT - HTTPD restarted on:' `date` | mail -s "Alert: HTTPD Restarted" [email protected]
fi

rm -rf test.file*

Apparently there's something wrong with the -O

edit: isn't this running on bash?

Peter · Aug 4, 2007

that looks like it will be a better opting than using a php script.

enlytend · Aug 4, 2007

If it's still not working, try sending the output to a file in some writeable directory (instead of /dev/null) so you can see any errors it spits out:

*/5 * * * * /bin/nfup > /tmp/somefilename 2>&1

If it's a cron issue, most cron problems are usually either paths, environments or permissions. Cron runs with a limited environment, not the user's standard login environment so things need to be spelled out in your script.

Once you get this running, I hope next thing on the agenda is to try to find out why httpd is crashing ? Sounds like you have much worse problems than getting this script to run!

Crusader · Aug 6, 2007

Talked it over on a few forums and came up with this:

Code:

#!/bin/bash
tmp_file="/home/user/test_file"
wget -t 1 -T8 -O $tmp_file http://www.domain.tld/file.html >> /dev/null 2>&1
test=`grep OK $tmp_file`
if [ "$test" == "" ]; then
        #echo "File download failed, assuming offline."
        /etc/init.d/httpd restart
        echo 'ALERT - HTTPD restarted on:' `date` | mail -s "Alert: HTTPD Restarted" [email protected]
elif [ "$test" == "<html>OK</html>" ]; then
        echo "HTTPD seems to be OK" >> /dev/null 2>&1
else
        #echo "Unknown error..."
        echo 'ALERT - HTTPD had an unkown error on:' `date` | mail -s "Alert: HTTPD Error" [email protected]
fi
rm -rf $tmp_file

Apparently WGET will download something even if it isn't there so you should check what's in the file first. I don't know if this'll work though but I'm hoping.

Note: file.html should contain

Code:

<html>OK</html>

Eric · Aug 6, 2007

Crusader said:
Talked it over on a few forums and came up with this:

Code:

#!/bin/bash tmp_file="/home/user/test_file" wget -t 1 -T8 -O $tmp_file http://www.domain.tld/file.html >> /dev/null 2>&1 test=`grep OK $tmp_file` if [ "$test" == "" ]; then #echo "File download failed, assuming offline." /etc/init.d/httpd restart echo 'ALERT - HTTPD restarted on:' `date` | mail -s "Alert: HTTPD Restarted" [email protected] elif [ "$test" == "<html>OK</html>" ]; then echo "HTTPD seems to be OK" >> /dev/null 2>&1 else #echo "Unknown error..." echo 'ALERT - HTTPD had an unkown error on:' `date` | mail -s "Alert: HTTPD Error" [email protected] fi rm -rf $tmp_file

Apparently WGET will download something even if it isn't there so you should check what's in the file first. I don't know if this'll work though but I'm hoping.

Note: file.html should contain

Code:

<html>OK</html>

http://www.rfxnetworks.com/sim.php

Restart httpd on fail

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