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So, in systemd we have a mechanism to pass environment variables to the process using PassEnvironment [https://www.freedesktop.org/software/systemd/man/systemd.exec.html]

Is it possible to specify default values for these variables in systemd service file itself ?

Could you provide an example ?

PS: I have tried out PassEnvironment='POLL_INTERVAL=10' but it is not working.

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Use the Environment= parameter instead. PassEnvironment= is used to pass variables whose values are defined within the systemd process itself (PID 1).

Example:

Environment=“VAR=string”

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