Cron sends a cron command as e-mail every day?

[cholzer]

Yesterday I did a clean install of Proxmox 8
Today I received an odd e-mail from my system that I do not understand.

It reads:

test -x /usr/sbin/anacron || { cd / && run-parts --report /etc/cron.daily; }

So that seems to originate from:

/etc/crontab

17 *    * * *   root    cd / && run-parts --report /etc/cron.hourly
25 6    * * *   root    test -x /usr/sbin/anacron || { cd / && run-parts --report /etc/cron.daily; }
47 6    * * 7   root    test -x /usr/sbin/anacron || { cd / && run-parts --report /etc/cron.weekly; }
52 6    1 * *   root    test -x /usr/sbin/anacron || { cd / && run-parts --report /etc/cron.monthly; }

But why the heck did I receive the cron job command via E-Mail ?
I have never had this happen before on any Proxmox install.

I suppose this should have been the result of the default scrub job?

I enabled the e-mail settings as usual:

/etc/zfs/zed.d/zed.rc
ZED_EMAIL_PROG="mail"
ZED_NOTIFY_VERBOSE=1

When I do a scrub manually, then I get the correct message.

ZFS scrub_finish event for nvme on pve

 

[cholzer]

Got the same E-mail from Cron again today.

can anyone tell me what is happening?

From: Cron <root@pve>
test -x /usr/sbin/anacron || { cd / && run-parts --report /etc/cron.daily; }

 

[BobhWasatch]

Do you have any scripts in cron.daily? Maybe one is returning an error but not generating any output.

 

[Dunuin]

It's normal behavior that cron will send the cronjobs output via mail. Either pipe the commands output into the void via ">/dev/null 2>&1" for singe commands or if you don't want to emails at all, add the line MAILTO="" to your crontab so cron got no recipient.

 

[cholzer]

It's normal behavior that cron will send the cronjobs output via mail. Either pipe the commands output into the void via ">/dev/null 2>&1" for singe commands or if you don't want to emails at all, add the line MAILTO="" to your crontab so cron got no recipient.

Thanks!
Since the ZFS scrub is triggered by cron, setting MAILTO="" will not disable that notification set in zed.rc, right? I do want to receive those.

 

[cholzer]

Do you have any scripts in cron.daily? Maybe one is returning an error but not generating any output.

Thanks for that!
I did test netdata on this Proxmox machine but ended up uninstalling it shortly after.
Turns out the uninstall did not remove everything as it did leave a file in cron.daily

I have delete that file now. Lets see if the e-mails stop now.

 

[Markus.K]

To suppress output to stdout and to stderr from inside a bash script in /etc/cron.daily/, insert this line at the top of the script:

exec >/dev/null 2>&1

cron/run-parts only generate mails if a job emits something to stdout/stderr.