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Old 03-21-2012, 08:16 PM   #1
ymnoor21
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Angry bash says "no such file or directory" when crontab runs the shell script


Hey Guys,
I have a problem that I need your help.

- I created a shell script like this (take_backup):

#!/bin/bash
mysqldump -u dbuser -pdbpass dbname > dbname_backup.sql

- Also I created a php file (backup.php) to execute the shell script

<?php
exec("bash take_backup");
?>

- My crontab looks like this:

MAILTO=myemail@mydomain.com
*/5 * * * * php /path/to/backup.php

- The shell script runs perfectly ok when I run the backup.php file from browser which uses the "take_backup" shell script behind. But my problem is I want to run the php file from the crontab and it doesn't get executed. Infact it emails me back with "bash: take_backup: No such file or directory"

FYI:
- "which bash" returns: /bin/bash
- I noticed that crontab is just not executing bash command in the backup.php file, other commands are working, ex: exec("ls -l");

Any reason??? Please help!!!!

Thanks
Yamin
 
Old 03-21-2012, 08:34 PM   #2
Tinkster
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Hi, welcome to LQ!

Simply specify the full path to take_backup in the PHP script.


Cheers,
Tink
 
Old 03-21-2012, 08:35 PM   #3
evo2
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Hi,

did you try putting the full path to "take_backup" in your php script?
Eg.

Code:
<?php
exec("bash /path/to/take_backup");
?>
Also, why did you wrap your shell script in a php script? Wouldn't it make more sense to have a cron job like:

Code:
*/5 * * * * /path/to/take_backup
Evo2.
 
Old 03-21-2012, 08:40 PM   #4
chrism01
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Expanding on good advice above; the cron env is minimal, which means you should specify the complete PATH to all cmds/files used, or source a file that defines them.
Also, forget the php in cron, just call the script as per evo2's suggestion.
 
Old 03-22-2012, 01:06 PM   #5
ymnoor21
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Quote:
Originally Posted by evo2 View Post
Hi,

did you try putting the full path to "take_backup" in your php script?
Eg.

Code:
<?php
exec("bash /path/to/take_backup");
?>
Also, why did you wrap your shell script in a php script? Wouldn't it make more sense to have a cron job like:

Code:
*/5 * * * * /path/to/take_backup
Evo2.
Uhu, nothing is working. I've tried this:

Configured crontab with full path of the shell script (according to your suggestion). But with no luck. I've tried followings in the crontab:

A. MAILTO=myemail@mydomain.com
*/5 * * * * bash /path/to/take_backup
Output of A: I didn't receive any Cron Daemon email

B. MAILTO=myemail@mydomain.com
*/5 * * * * /path/to/take_backup
Output of B: I didn't receive any Cron Daemon email

C. MAILTO=myemail@mydomain.com
*/5 * * * * ./path/to/take_backup
Output of C: /bin/sh: ./path/to/take_backup: No such file or directory (in the Cron Daemon email)

Am I missing something? Any help would be very much appreciated...

Thanks
Yamin
 
Old 03-22-2012, 01:56 PM   #6
Tinkster
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What about crons log?
 
Old 03-22-2012, 02:15 PM   #7
ymnoor21
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Quote:
Originally Posted by Tinkster View Post
What about crons log?
CRON LOG OUTPUT:
[TRUNCATED BEFORE...]

Mar 22 10:00:01 www crond[1543]: (root) RELOAD (/var/spool/cron/root)
Mar 22 10:00:01 www CROND[6801]: (root) CMD (./path/to/take_backup)
Mar 22 10:00:01 www CROND[6802]: (root) CMD (/usr/lib64/sa/sa1 -S DISK 1 1)
Mar 22 10:01:01 www CROND[6825]: (root) CMD (run-parts /etc/cron.hourly)
Mar 22 10:01:01 www CROND[6826]: (root) CMD (run-parts /etc/cron.hourly)
Mar 22 10:01:01 www CROND[6827]: (root) CMD (./path/to/take_backup)
Mar 22 10:01:01 www run-parts(/etc/cron.hourly)[6825]: starting 0anacron
Mar 22 10:01:01 www run-parts(/etc/cron.hourly)[6826]: starting 0anacron
Mar 22 10:01:01 www anacron[6850]: Anacron started on 2012-03-22
Mar 22 10:01:01 www anacron[6850]: Normal exit (0 jobs run)
Mar 22 10:01:01 www anacron[6852]: Anacron started on 2012-03-22
Mar 22 10:01:01 www anacron[6852]: Normal exit (0 jobs run)
Mar 22 10:01:01 www run-parts(/etc/cron.hourly)[6855]: finished 0anacron
Mar 22 10:01:01 www run-parts(/etc/cron.hourly)[6856]: finished 0anacron
Mar 22 10:01:30 www crontab[6864]: (root) BEGIN EDIT (root)
Mar 22 10:01:36 www crontab[6864]: (root) REPLACE (root)
Mar 22 10:01:36 www crontab[6864]: (root) END EDIT (root)
Mar 22 10:02:01 www crond[1543]: (root) RELOAD (/var/spool/cron/root)
Mar 22 10:06:29 www crontab[6934]: (root) BEGIN EDIT (root)
Mar 22 10:06:35 www crontab[6934]: (root) END EDIT (root)
Mar 22 10:10:01 www CROND[6986]: (root) CMD (/usr/lib64/sa/sa1 -S DISK 1 1)
Mar 22 10:20:01 www CROND[7126]: (root) CMD (/usr/lib64/sa/sa1 -S DISK 1 1)
Mar 22 10:30:01 www CROND[7241]: (root) CMD (/usr/lib64/sa/sa1 -S DISK 1 1)
Mar 22 10:40:01 www CROND[7260]: (root) CMD (/usr/lib64/sa/sa1 -S DISK 1 1)
Mar 22 10:50:01 www CROND[7280]: (root) CMD (/usr/lib64/sa/sa1 -S DISK 1 1)
Mar 22 11:00:01 www CROND[7319]: (root) CMD (/usr/lib64/sa/sa1 -S DISK 1 1)
Mar 22 11:01:01 www CROND[7329]: (root) CMD (run-parts /etc/cron.hourly)
Mar 22 11:01:01 www CROND[7330]: (root) CMD (run-parts /etc/cron.hourly)
Mar 22 11:01:01 www run-parts(/etc/cron.hourly)[7330]: starting 0anacron
Mar 22 11:01:01 www run-parts(/etc/cron.hourly)[7329]: starting 0anacron
Mar 22 11:01:01 www anacron[7352]: Anacron started on 2012-03-22
Mar 22 11:01:01 www anacron[7354]: Anacron started on 2012-03-22
Mar 22 11:01:01 www anacron[7354]: Normal exit (0 jobs run)
Mar 22 11:01:01 www run-parts(/etc/cron.hourly)[7356]: finished 0anacron
Mar 22 11:01:01 www run-parts(/etc/cron.hourly)[7357]: finished 0anacron
Mar 22 11:01:01 www anacron[7352]: Normal exit (0 jobs run)

Seems like 0anacron is running as well. But don't think 0anacron is conflicting mine, as my crontab frequency is just about every five minutes. What do you think?

Also, my OS is: CentOS Linux release 6.0 (Final)
So I checked the cron log's default file location: /var/log and did this:
vi /var/log/cron (which is the latest)

Thanks
Yamin
 
Old 03-22-2012, 02:28 PM   #8
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Just for good measure also check
grep -ril cron /var/log/

I'd expect to see a line for your user, somewhere.

Can you match the attempts that had errors w/ any cron
times in the system logs?
 
Old 03-22-2012, 02:41 PM   #9
ymnoor21
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Quote:
Originally Posted by Tinkster View Post
Just for good measure also check
grep -ril cron /var/log/

/var/log/cron
/var/log/cron-20120226
/var/log/cron-20120311
/var/log/audit/audit.log
/var/log/btmp-20120301
/var/log/cron-20120318
/var/log/anaconda.yum.log
/var/log/anaconda.log
/var/log/cron-20120304
/var/log/secure
/var/log/vsftpd.log


Quote:
Originally Posted by Tinkster View Post
- I'd expect to see a line for your user, somewhere.

- Can you match the attempts that had errors w/ any cron
times in the system logs?
- What do you mean?
 
Old 03-22-2012, 03:54 PM   #10
lithos
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Hi,

did you run the mysqlbackup from "take_backup" with full path too ?
Code:
for example:
/sbin/mysqldump ....
 
Old 03-22-2012, 04:58 PM   #11
ymnoor21
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Quote:
Originally Posted by lithos View Post
Hi,

did you run the mysqlbackup from "take_backup" with full path too ?
Code:
for example:
/sbin/mysqldump ....
Yes I did try this too:
/var/lib/mysqldump -u username -ppassword database > database_backup.sql

You know what. Funny thing is if I just run the php script via browser with this following shell command:
<?php
exec("bash /path/to/take_backup");
?>

then the database backup does gets created.

I just dont understand why would the same php script or direct invoking of the shell script (take_backup) wont work from crontab. (
 
Old 03-22-2012, 07:45 PM   #12
chrism01
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I think we need to start from the beginning; try
Code:
*/5 * * * * echo $(date) > /tmp/cron_test.log
Remember that if cron has an issue, it will email the owner and/or root acct, which you can check by logging in as the job owner and as root and using
Code:
mailx
Can we also see the contents of
Code:
/etc/cron.deny
/etc/cron.allow
if they exist.
 
Old 03-22-2012, 08:30 PM   #13
ymnoor21
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Quote:
Originally Posted by chrism01 View Post
I think we need to start from the beginning; try
Code:
*/5 * * * * echo $(date) > /tmp/cron_test.log
Thu Mar 22 17:22:01 PDT 2012

Remember that if cron has an issue, it will email the owner and/or root acct, which you can check by logging in as the job owner and as root and using
Code:
mailx
Right now, I have redirected it to email me in the crontab:
MAILTO=myemail@mydomain.com
*/5 * * * * echo $(date) > /tmp/cron_test.log


Can we also see the contents of
Code:
/etc/cron.deny
/etc/cron.allow
if they exist.

/etc/cron.deny file exist but nothing in it.
/etc/cron.allow file do not exist.

FYI, crontab works perfectly for me (Ex: I tested one of my hourly email reminder program with cron), it just cant run with any shell script.

Last edited by ymnoor21; 03-22-2012 at 08:35 PM. Reason: Spelling
 
Old 03-22-2012, 08:37 PM   #14
chrism01
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OK; next check where bash is
Code:
which bash
gives me '/bin/bash' on my system, so I'd construct a shell file (using a Linux editor such as vi/vim) called mytest.sh
Code:
#!/bin/bash
echo "in shell file"
echo $(date) > /tmp/cron_test.log
Code:
chmod a+x mytest.sh
Code:
#grab curr dir path info
pwd
and put that in cron
Code:
*/5 * * * * <put pwd output here>/mytest.sh > /tmp/cron_test.log 2>&1
 
Old 03-22-2012, 09:02 PM   #15
ymnoor21
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Quote:
Originally Posted by chrism01 View Post
OK; next check where bash is
Code:
which bash

- it gives /bin/bash for my system too


Quote:
Originally Posted by chrism01 View Post
gives me '/bin/bash' on my system, so I'd construct a shell file (using a Linux editor such as vi/vim) called mytest.sh
Code:
#!/bin/bash
echo "in shell file"
echo $(date) > /tmp/cron_test.log

- I used vi to create mytest.sh and pasted your code above


Quote:
Originally Posted by chrism01 View Post
Code:
chmod a+x mytest.sh
- did the permission settings.

Quote:
Originally Posted by chrism01 View Post
Code:
#grab curr dir path info
pwd
and put that in cron
Code:
*/5 * * * * <put pwd output here>/mytest.sh > /tmp/cron_test.log 2>&1
- did that in my crontab

- Output of the /tmp/cron_test.log file:
Thu Mar 22 17:57:01 PDT 2012
 
  


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