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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

Level
Clock icon Intermediate
Duration
Clock icon 30m
Published
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, network-online.target seems like the best bet.

    If you look at man 7 systemd.special there's an entry about the network-online.target 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:

    [Unit]
Description=Custom Service
Wants=network-online.target
After=network-online.target

[Service]
Type=forking
ExecStart=/usr/bin/emacs --daemon
ExecStop=/usr/bin/emacsclient --eval "(kill-emacs)"

[Install]
WantedBy=default.target

    Once complete, test it with:

    systemctl start custom.service

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

A Cloud Guru - Labs - Creating Your Own Service File with Network Requirements in CentOS
Author
A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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