Are environment variables created in systemd on Linux via "set-environment" in-memory or on disk?

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If I run the command

systemctl set-environment VARIABLE=VALUE

Will that be stored only in memory, or is it persisted to disk?

systemd environment-variables linux bash
1 Answers

systemctl's {set,unset,import}-environment subcommands affect only the runtime configuration (i.e. they persist only until reboot, but will survive systemctl daemon-reexec and systemctl daemon-reload).

If you, in any case, would like to make the environment configuration permanent, you can use the DefaultEnvironment= directive in /etc/systemd/system.conf (see systemd-system.conf(5)) for system-wide environment variable configuration or Environment= (systemd.exec(5)) for per-unit configuration.

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