restart httpd on fail

Crusader · 08-04-2007, 02:27 PM

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" user@domain.tld
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 · 08-04-2007, 02:45 PM

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 /path/you/can/write/to/test.file
wget -q $FILE -O /path/you/can/write/to/test.file

if [ ! -f /path/you/can/write/to/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 · 08-04-2007, 03:11 PM

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 · 08-04-2007, 03:12 PM

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" user@domain.tld
fi

rm -rf test.file*

Apparently there's something wrong with the -O

edit: isn't this running on bash?

Peter · 08-04-2007, 03:38 PM

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

enlytend · 08-04-2007, 03:43 PM

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 · 08-05-2007, 11:11 PM

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" you@domain.tld
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" you@domain.tld
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** · 08-06-2007, 02:09 AM

Quote:

Originally Posted by Crusader

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" you@domain.tld
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" you@domain.tld
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

08-04-2007, 02:27 PM	#1 (permalink)
Crusader Senior Member Join Date: Aug 2003 Location: Canada Posts: 1,293 1,264.40 NP$ (Donate)	restart httpd on fail 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" user@domain.tld 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 __________________ Near Fantastica \| Matthew Good - Vancouver >> Do you Frawlik? <<

08-04-2007, 02:45 PM	#2 (permalink)
cef NamePros Regular Join Date: May 2004 Location: NYC Posts: 236 76.50 NP$ (Donate)	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 /path/you/can/write/to/test.file wget -q $FILE -O /path/you/can/write/to/test.file if [ ! -f /path/you/can/write/to/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.

08-04-2007, 03:11 PM	#3 (permalink)
Peter Senior Member Join Date: Nov 2003 Location: Scotland Posts: 4,900 0.60 NP$ (Donate)	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? __________________ Manage your portfolio using my new Domain Portfolio Management script. Securing Your Domain Name From Theft

08-04-2007, 03:12 PM	#4 (permalink)
Crusader Senior Member Join Date: Aug 2003 Location: Canada Posts: 1,293 1,264.40 NP$ (Donate)	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" user@domain.tld fi rm -rf test.file* Apparently there's something wrong with the -O edit: isn't this running on bash? __________________ Near Fantastica \| Matthew Good - Vancouver >> Do you Frawlik? <<

08-04-2007, 03:38 PM	#5 (permalink)
Peter Senior Member Join Date: Nov 2003 Location: Scotland Posts: 4,900 0.60 NP$ (Donate)	that looks like it will be a better opting than using a php script. __________________ Manage your portfolio using my new Domain Portfolio Management script. Securing Your Domain Name From Theft

08-04-2007, 03:43 PM	#6 (permalink)
enlytend NamePros Regular Join Date: Aug 2006 Location: USA Posts: 725 212.90 NP$ (Donate)	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! Last edited by enlytend; 08-05-2007 at 03:59 PM.

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