Resolved Cron skipping intervals

[Jelle_Timmer]

Hi all!

For a few days now one of my Plesk Onyx 17.5 servers is having issues with executing it's cronjobs.
My application has a job which is running every minute, but since a couple of days it is skipping every 5th minute.

So it runs every minute of every hour every day, except for .00, .05, .10, .15, etc...

Every non-5th minute the task executes without any issues and manual execution doesn't show errors.

The cron log in /var/log shows the job should've been executed, but when i add a logline for every execution (added &>> /var/www/vhosts/*****.*****.eu/cronlog.log to the cron-command) it doesn't show the 5th minutes.

What i noticed about my logs from yesterday is that, when the job did execute in a 5th minute, it was somewhere in the high 50-seconds in stead of somewhere in the first 15 normally...

The contents of /var/spool/cron/USER
MAILTO=""
* * * * * cd /var/www/vhosts/*****.*****.eu/httpdocs; ./crontasks &>> /var/www/vhosts/*****.*****.eu/cronlog.log

Anyone knows what could be wrong? And better, how to get cron into line again?

Server info:
OS: CentOS 7.5.1804
Plesk: Onyx 17.5.3#55
Fully updated
Script is PHP-cli file, running from PHP 7.1

 

[Jelle_Timmer]

Now, a few days later, the issue is still present, but the skip-interval seems to slowly 'crawl' between minutes.

Not only the server mentioned above, but also other servers are showing this behavior. All are running Plesk 17.5.3#55 with CentOS 7.5.1804.
All called scripts depend on PHP 7.1, installed through Plesk.

I also have some servers running Plesk 17.5 with CentOS 6.9 and PHP 7.1, they don't seem to have this problem.
Also, cronjobs which don't have to execute a PHP-script seem to run as they should, without delays/skipping.

The length of the script doesn't seem to influence the delay/skip, because even a simple script that only echos/logs the current time is impacted.

#!/opt/plesk/php/7.1/bin/php
<?php
if(PHP_VERSION_ID > 70000) {
    date_default_timezone_set("Europe/Amsterdam");
}

error_log("Time: ".date("Y-m-d H:i:s"));

exit();
?>

I'm aware this might not be a Plesk-related/caused problem, but maybe someone still has an idea about how to fix it.

 

[Jelle_Timmer]

It's still unclear what caused this issues, but switching back to PHP 7.0 solved the problem. However, it would be nice to be able to keep up with the latest releases.