Fc20, systemd, and nonexistent services

[David Mehler]

Hello,

Thanks.



On 2/18/14, T.C. Hollingsworth <tchollingsworth at gmail.com> wrote:
> On Mon, Feb 17, 2014 at 6:42 PM, David Mehler <dave.mehler at gmail.com> wrote:
>> Hello,
>>
>> I'm running a new FC20 system, one that was upgraded.
>>
>> I'm using:
>>
>> systemctl -t service -a -l
>>
>> to check services and I'm seeing several that I don't have installed,
>> exim (MTA?) for example. I've tried using systemctl disable to remove
>> the service, and don't get anything back.
>>
>> How do I prune my services list/get the unknown or uninstalled packages
>> out?
>
> Don't pass the '-a' argument to systemctl.  ;-)
>
> Using the '-a' argument makes systemctl display every unit it knows
> about regardless of whether it's installed or not.  There are several
> ways it can know about services that don't exist.  The most common
> case where this happens is if a service wants to make sure it is
> started before/after another service, but doesn't necessarily require
> it to be running if it's not installed.  It defines Before/After
> dependencies for such services in its systemd unit file, which affects
> the ordering of services being started, but not whether they're
> actually started.
>
> So you probably have some service that wants to start before/after
> exim, but doesn't necessarily require it to be there. (Perhaps because
> it could work with sendmail or postfix as well).  This is nothing to
> worry about, hence why systemctl hides it from you unless you
> specifically unearth it with the '-a' argument.
>
> If you want to view all running services and ones systemd tried and
> failed to start, just use 'systemctl -t service'.  If you want to see
> a list of all services and whether they're enabled, disabled, or
> statically enabled, use 'systemctl -t service list-unit-files'.
>
> -T.C.
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