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Email notification is sent from KernelCare: /usr/bin/kcarectl --auto-update --gradual-rollout=auto Unknown Kernel

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Kuzma Ivanov
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Plesk for Linux kb: technical ABT: Group A

Applicable to:

  • Plesk for Linux

Symptoms

Plesk Administrator receives one of the following messages from the KernelCare extension:

PLESK_INFO: Cron <root@localhost> /usr/bin/kcarectl --auto-update --gradual-rollout=auto
Unknown Kernel (Ubuntu 4.13.0-1011-gcp)

PLESK_INFO: Cron <root@localhost> /usr/bin/kcarectl --auto-update --gradual-rollout=auto
<urlopen error Request for `https://patches.kernelcare.com/98e7651e467b5b8372fcddc27a87b7507974a113/latest.v2? ... ` failed: <urlopen error [Errno -3] Temporary failure in name resolution

  • The KernelCare checker reports that the version of kernel is not supported:

    # curl -s https://raw.githubusercontent.com/iseletsk/kernelchecker/master/py/kc-compat.py|python
    UNSUPPORTED

  • The execution of the command below fails with the next error:

    # /usr/bin/kcarectl --auto-update
    IOError: [Errno 2] No such file or directory: '/proc/modules'

Cause

KernelCare does not support the current kernel version.

Resolution

The upgrade of the kernel is required to be done manually by means of operating system tools. 

Comments

6 comments

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  • Avatar
    Carlos Oropesa

    Another solution,

    Don't remove the extension, just disable the cronjob (via commands).

    #> nano /etc/cron.d/kcare-cron

    Comments the line and save it.

    #57 */4 * * * root /usr/bin/kcarectl -q --auto-update

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  • Avatar
    Georg Schreier

    Hello, after I removed the extension, I still get the notification. Does something else have to be considered in addition to the instructions? Thanks in advance.

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  • Avatar
    Anna Morozyuk

    Hi @Georg Schreier!

    Most probably you have faced a Plesk bug with ID: EXTCERT-200.

    Use the Resolution from the article below:
    https://support.plesk.com/hc/en-us/articles/115002396785-Errors-are-emailed-after-KernelCare-extension-removal-bin-sh-1-usr-bin-kcarectl-not-found
    And feel free to subscribe to the article below to get informed, when it is going to be fixed.

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    Taras Ermoshin

    Hello @Alan Melnikov !

    Is there the text starting with "Unknown Kernel" after "--gradual-rollout=auto" ? If yes, then this article describes your case and you should follow the instructions from the Resolution section.

    Also, this article from CloudLinux (they develop KernelCare) can help you find out if your kernel is supported or not.

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    Georg Schreier

    Hi @Anna Morozyuk,

    thank you, that was the solution.

    Best regards.

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  • Avatar
    Alan Melnikov

    Hello, this message comes to me too: Cron <root@static> /usr/bin/kcarectl --auto-update --gradual-rollout=auto, Can you tell me what to do?

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