DaanHoogland commented on issue #3973: systemd dependency on db URL: https://github.com/apache/cloudstack/pull/3973#issuecomment-599942124 @rvalle in the case of `Wants`, if the dependency is present it will be started before the dependant, and shutdown after. if it is not or if it fails to start the dependant is started anyway. (see https://github.com/apache/cloudstack/issues/3954#issuecomment-599593507) so - when it is present on the system it works like requires, and - when the user decides to install it on another system it will start anyway (but the user is responsible for proper startup and shutdown procedures) If I interpret the docs correctly we can add the mysql.target with no harm. if either is present they will be started. The user must make sure not both are present though, to avoid conflict. I can see how you envision a more elegant solution, but I would opt for next release for that, minimising code change during freeze and hastening release. If this can be tested and shown to work.... I would prefer to be working on the next release by the end of the month ;)
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