Magento – Magento2: run cron job every minute

cronmagento2

System cron starts Magento 2 cron every minute:

$ crontab -l
*/1 * * * * /usr/bin/php /home/user/prj/mage2/bin/magento cron:run >> /home/user/prj/mage2/var/log/cron.log

I see new line Ran jobs by schedule. is added every minute into the log.

This is my settings for my task:

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Cron:etc/crontab.xsd">
    <group id="default">
        <job name="my_own" instance="\Vendor\Module\Cron\Task" method="execute">
            <schedule>...</schedule>
        </job>
    </group>
</config>

These settings run my job every 15 minutes in fact (my own message is added every 15 minutes into the log):

<schedule>* * * * *</schedule>
<schedule>*/1 * * * *</schedule>

This is my log:

...
Ran jobs by schedule.
Ran jobs by schedule.
Ran jobs by schedule.
My own job is started.
Ran jobs by schedule.
...

These are Magento 2 cron settings:

How can I set <schedule> to run my task every 1 minute?

Best Answer

There are 2 groups in Magento 2 cron: index & default. Tasks/jobs are placed into index group will start every 1 minute (by default setup):

<group id="index">
    <job name="..." instance="..." method="...">
        <schedule>* * * * *</schedule>
    </job>
</group>

Tasks/jobs are placed into default group will start every 15 minutes (by default setup):

<group id="default">
    <job name="..." instance="..." method="...">
        <schedule>* * * * *</schedule>
    </job>
</group>

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I experienced a similar issue. Check the server that runs the cronjobs for zombie magento cron processes and kill it.

Magento – Can someone give detailed explanation about scheduling in Magento 2 cron job

This can not be a complete answer to my question about detailed explanation of how Magento's cron schedule works and admin config parameters, but there are few notices:

System cron schedule must be more frequent then magento's cron job schedule. In other case it will skip tasks.
In case of above notice there is no need to include bin/magento cron:run command in system cron twice.
As for magento docs it's recomended to run default magento's cron tasks every minute.
There is also config for cron groups in admin panel in which there is a "Generate Schedules Every" parameter. It affects on cron job launch frequency (job can not launch more frequent than this parameter specifies). What for "Schedule Ahead For" it's a mystery for me for now.

Therefore, for example, if I set system cron to run every minute:

* * * * * /usr/bin/php /srv/www/my_directory/bin/magento cron:run

set up cron job (which is in default group) to run every 5 minutes:

> <group id="default">
>     <job name="my_custom_job" instance="My\Module\Cron\MyCustomJob" method="execute">
>         <schedule>*/5 * * * *</schedule>
>     </job>
> </group>

and in admin config panel leave default values ("Generate Schedules Every" 15 minutes),

than my cron job will run every 15 minutes (as admin config limits).

For more frequent launching I must create custom group with other parameters.

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