rvalle commented on issue #3973: systemd dependency on db URL: https://github.com/apache/cloudstack/pull/3973#issuecomment-602001109 This is the best I can find from Redhat 7 **Requires** : _Configures dependencies on other units. The units listed in Requires are activated together with the unit. If any of the required units fail to start, the unit is not activated._ **Wants**: _Configures weaker dependencies than Requires. If any of the listed units does not start successfully, it has no impact on the unit activation. This is the recommended way to establish custom unit dependencies._ Looks like Wants would also start CSM if mysql is present but fails to start. I am thinking that manually stopping the service could also be interpreted as failure (?). I am not sure, but Requires is a much safer relationship for our use case.
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