Scheduled Tasks always fail

[yabado]

Whenever a user in my Cloudlinux powered Plesk Panel 12 tries to use the scheduled tasks, this is the error that is emailed to them...

execl: couldn't exec `/usr/local/psa/bin/chrootsh'
execl: No such file or directory

Does not matter what the task is, same error every time.

Even something as simple as wget http://plesk.com

What is wrong?

 

[UFHH01]

Hi yabado,

does this help => http://kb.odin.com/9522 <= ?

 

[yabado]

The chrootsh file does exists and no migration was ever made .

12K -rwsr-x--- 1 root psacln 8.1K Jun 6 2014 /usr/local/psa/bin/chrootsh

So that is not it.

 

[yabado]

Here is what I had to do to fix this. I know it cannot be correct, but now the task fires without error.

Open the site's cron file here...

/var/spool/cron/mysite

The comment out this line

#SHELL=/usr/local/psa/bin/chrootsh

After that the task will work. That SHELL command does not work and breaks everything.

Can someone explain what this does and why it does not work?

 

[UFHH01]

Hi yabado,

did you as well reconfigure the chrootsh - setting, as suggested in the KB? ( /usr/local/psa/bin/server_pref -u -crontab-secure-shell /usr/local/psa/bin/chrootsh )

Did you try as well to define the complete path to the executable? I.e.: "/usr/bin/wget http://www.example.com/cron.php" ?


The solution you choosed is the way to "trust" your customers to run scripts not only in the chroot - environment.
Instead of editing the file "/var/spool/cron/mysite", you could have used the setting:

/usr/local/psa/bin/server_pref -u -crontab-secure-shell “”

For more possible server preferences, please use the command:

/usr/local/psa/bin/server_pref --help​

 

[yabado]

Do you happen to know the KB URL you mention? I will check it out.

Nevermind, you must mean this one? http://kb.odin.com/en/115889

 

[yabado]

Setting the complete path in the "task" is not he issue.

The job never gets past the 'SHELL=/usr/local/psa/bin/chrootsh' line in the spool file.

 

[yabado]

If I establish this ...

/usr/local/psa/bin/server_pref -u -crontab-secure-shell “”

... will it open my server up to users using malicious scripts that could effect outside their chrooted area?

Or does it just allow them to use binaries outside of their ftp area ( i.e. wget, curl, php, etc... ) ?

Just trying to figure out the safest and best way to allow a user to setup a task, primarily hitting a specific web page every x minutes?

From what I have done so far, it seems nothing will work when the 'SHELL=/usr/local/psa/bin/chrootsh' is in their spool file?

 

[UFHH01]

Hi yabado,

the provided command does nothing else, than what you did by editing your "/var/spool/cron/mysite" ( #SHELL=/usr/local/psa/bin/chrootsh ), it opens up the chroot and let the users use other binaries as well, apart the ones at "/var/www/vhosts/chroot/bin".

You could try as well to solve your issue by checking and reconfiguring your settings with the tool "chrootmng"

• Check if your binaries at "/var/www/vhosts/chroot/bin" exist and check as well that the libraries exist at "/var/www/vhosts/chroot/lib". - in case of wget, it should be

/var/www/vhosts/chroot/usr/lib/liblwres.so.60
/var/www/vhosts/chroot/usr/lib/libdns.so.64
/var/www/vhosts/chroot/usr/lib/libgssapi_krb5.so.2
/var/www/vhosts/chroot/usr/lib/libbind9.so.60
/var/www/vhosts/chroot/usr/lib/libisccfg.so.60
/var/www/vhosts/chroot/usr/lib/libisc.so.60
/var/www/vhosts/chroot/lib/libcap.so.2
/var/www/vhosts/chroot/usr/lib/libxml2.so.2
/var/www/vhosts/chroot/usr/lib/libGeoIP.so.1
/var/www/vhosts/chroot/usr/lib/libkrb5.so.3
/var/www/vhosts/chroot/usr/lib/libk5crypto.so.3
/var/www/vhosts/chroot/lib/libcom_err.so.2
/var/www/vhosts/chroot/usr/lib/libkrb5support.so.0
/var/www/vhosts/chroot/lib/libkeyutils.so.1
/var/www/vhosts/chroot/lib/libresolv.so.2
/var/www/vhosts/chroot/usr/lib/libisccc.so.60

• Reconfigure the chroot - environment with:

/usr/local/psa/admin/sbin/chrootmng --remove --source=/var/www/vhosts/chroot/ --target=/var/www/vhosts/<domain>
/usr/local/psa/admin/sbin/chrootmng --create --source=/var/www/vhosts/chroot/ --target=/var/www/vhosts/<domain>​

• Undo your previous changes from http://talk.plesk.com/threads/scheduled-tasks-always-fail.331821/#post-775161

• Reconfigure your server settings:

/usr/local/psa/bin/server_pref -u -crontab-secure-shell /usr/local/psa/bin/chrootsh​

• Setup the cronjob to ( for example! ) :

wget -O /dev/null "http://www.example.com/cron.php"
​

• Please make sure, that the domain setting at ""Access to the server over SSH" is set in the domain settings and "/bin/bash" is set, instead of "forbidden"

If you are unsure about this setting, please have a look at:

How to give Plesk users SSH access? ( KB - article 122 286 )

​

Please wait up for the next scheduled execution of the cronjob that you just setup and please reply with the result here in the thread.

 

[yabado]

Still getting this error when it runs...

execl: couldn't exec `/usr/local/psa/bin/chrootsh'
execl: No such file or directory

I checked /var/www/vhosts/chroot/bin and /var/www/vhosts/chroot/lib, and they both contain the necessary files.

All I want is for my users to be able to schedule a task, or at very least request a web page, every 5 minutes ( for example ).

I am running Cloudlinux, could that be part of the issue?

 

[yabado]

Turns out is was an issue with CloudLinux. Their support team fixed me up. CageFS prevents the need to use the chroot.