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Description of problem: It would be nice when units could be customized locally. E.g. the stop timeout of proxy servers (tor, squid) depends on the use case and should be customizable by the administrator. First tries like | [Service] | Environment = TOR_SHUTDOWN_WAIT=30 | Environment = TOR_NOFILE=4096 | EnvironmentFile = -/etc/sysconfig/tor | TimeoutSec = ${TOR_SHUTDOWN_WAIT} | LimitNOFILE = ${TOR_NOFILE} do not work because environment variables are expanded for special stanzas only. A solution might be service files ending with .append (e.g. '/etc/systemd/systemd/tor.service.append') which are (logically) appended to existing units and can override default settings. This would make it also possible, to define behavior of foo@ units depending on the instance.
You can override packaged units by adding unit files in /etc/systemd/system. There you can use ".include" and override only the settings you want. See http://fedoraproject.org/wiki/Systemd#How_do_I_customize_a_unit_file.2F_add_a_custom_unit_file.3F This mechanism should be sufficient for your use-case. Is it not? There is an entry on the systemd TODO list to add another mechanism: * read config fragments for all units from /lib/systemd/system/foobar.service.d/ to override/extend specific settings
thx; will work in the described way