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Accepted
Amos Shapira
Asked: 2021-02-03 22:35:26 +0800 CST

Executing a command before starting a systemd service [duplicate]

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I want to execute a script before starting a service every time the service is started.

I know that I can use ExecStartPre inside the service definition file, but I wonder if it's possible to achieve without editing a file which comes from the service's package.

The script is a simple command which exits when it's done, it creates files which are used by the main service (it fetches TLS certificates and keys from secure storage).

systemd

1 Answers

  1. Best Answer

    Sure. You can use specific independant includes:

    mkdir /etc/systemd/service/<servicename>.service.d
echo /etc/systemd/service/<servicename>.service.d/<anything>.conf << EOF
[Service]
ExecStartPre=<path to script>
EOF
systemctl daemon-reload

    et voila.

    Reference: Search for "drop-in" in systemd.unit — Unit configuration

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