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Creating Your Own Service File with Network Requirements in CentOS

At some point in your career as a system administrator, you'll be given a piece of software that doesn't have its own service file. If that ever happens, the skills gained here will let you write up a service file so `systemd` can manage the service with no issues.

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Path Info

Clock icon Intermediate
Clock icon 30m
Clock icon Apr 03, 2020

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Table of Contents

  1. Challenge

    Identify the Target to Use to Determine if the Network Is Online

    In /usr/lib/systemd/system, there are a number of targets you might be able to use.

    Among them, seems like the best bet.

    If you look at man 7 systemd.special there's an entry about the as well, and that looks like the right thing.

  2. Challenge

    Write the Custom Service File

    First, navigate to /etc/systemd/system to place our custom service file.

    There, open custom.service and fill it out so it looks like this:

    Description=Custom Service
    ExecStart=/usr/bin/emacs --daemon
    ExecStop=/usr/bin/emacsclient --eval "(kill-emacs)"

    Once complete, test it with:

    systemctl start custom.service

    Once it's running, leave it that way and you've completed the task.

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