Why can't apache access files in /tmp?

[Tom H]

On Wed, Oct 31, 2018 at 12:50 PM Chris Green <cl at isbd.net> wrote:
> On Wed, Oct 31, 2018 at 12:06:24PM +0100, Tom H wrote:
>> On Tue, Oct 30, 2018 at 4:03 PM Colin Law <clanlaw at gmail.com> wrote:


>>> Make a copy of it with a different name and edit that, then disable
>>> the usual one and enable yours. If you don't make a copy then it will
>>> get overwritten when you update.
>>
>> "systemctl edit <unit>" will set up a
>> "/etc/systemd/system/<unit>.d/override.conf" drop-in automatically.
>
> I have two files which seem relevant:-
>
> /lib/systemd/system/apache2.service
> /lib/systemd/system/apache2.service.d/apache2-systemd.conf
>
> Both of them seem to be 'original' as in installed from my
> distribution and not changed since.

Is this on 16.04? It doesn't have
"/lib/systemd/system/apache2.service" by default; it only has
"/lib/systemd/system/apache2.service.d/apache2-systemd.conf" to
override the sysv-generator-created service unit. Are you sure that
you didn't create it?


> I assume the name 'override.conf' isn't actually important and
> anything in /etc/systemd/system/apache2.service.d will be acted upon
> by systemd.

The file name has to end with ".conf". I asume that systemd'll be able
to handle two drop-ins, one under "/lib" and one under "/etc" (!).


> Does the override file have to specify everything or can it just
> change individual parameters with the rest being set by the files in
> /lib/systemd/system?

Yo can override individual parameters but you have to use the section
"titles" for example:

To override

[Install]
WantedBy=multi-user.target

the drop-in'll have to be

[Install]
WantedBy=graphical.target

IIRC, there's an exception for ExecStart

To override

[Service]
ExecStart=/sbin/<daemon> -optionX

the drop-in'll have to be

[Service]
ExecStart=
ExecStart=/sbin/<daemon> -optionY