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.
Successfully complete this lab by achieving the following learning objectives:
- Identify the Target to Use to Determine if the Network Is Online
/usr/lib/systemd/system, there are a number of targets you might be able to use.
network-online.targetseems like the best bet.
If you look at
man 7 systemd.specialthere’s an entry about the
network-online.targetas well, and that looks like the right thing.
- Write the Custom Service File
First, navigate to
/etc/systemd/systemto place our custom service file.
custom.serviceand 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.