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Troubleshoot Service Errors on Start

In this exercise, you will troubleshoot and resolve service errors upon start of the `pmcd` service. *This course is not approved or sponsored by Red Hat.*

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Path Info

Clock icon Advanced
Clock icon 1h 30m
Clock icon Apr 04, 2019

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Table of Contents

  1. Challenge

    Resolve the startup issue with pmcd.

    Attempt to start the pmcd service:

    systemctl start pmcd

    If the service fails to start, take a look at the details:

    systemctl status -l pmcd

    Note the "Drop-In" file /etc/systemd/system/pmcd.service.d/dependency.conf.

    View the contents of this file and note any directives referencing other services:

    cat /etc/systemd/system/pmcd.service.d/dependency.conf

    Attempt to start the pmlogger service:

    systemctl start pmlogger

    If the service won't start, perform the same exercise as above with pmcd.

    Resolve the cyclical dependency by modifying the pmcd drop-in file from After=pmlogger.service to Before=pmlogger.service.

    Start the pmcd service.

  2. Challenge

    Configure pmcd to start by default.

    Enable pmcd to startup upon reboot:

    systemctl enable pmcd

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