L-o-n-g delay for rc.local in systemd on Ubuntu.

[Xen]

Ralf Mardorf schreef op 09-08-2017 9:09:
> On Tue, 08 Aug 2017 18:53:03 +0200, Xen wrote:
>> Ralf Mardorf schreef op 08-08-2017 17:02:
>>> Why don't you let a systemd unit start your extreme lightweight stuff
>>> instead of rc.local?
>> 
>> Maybe because he didn't know how to do that.
>> 
>> Hint: it is more useful to give people a hint, than to ask why they
>> are not using that hint
> 
> So actually even you point out, that I gave a hint, while at the same
> time you reply without providing any useful information at all.

I am not going to have an argument over the back of someone else, but I 
just wanted to (and want to) point out that "why not" questions are not 
very useful.

Suppose you got your answer.

"Because I didn't know how to."

How would that enlighten you?

Anyway, sorry to interfere, but I just wanted to point that out.

"Hey, all.  I've got some stuff in my rc.local, and it takes *forever* 
to execute -- three+ minutes.  (Note that the machine -- a virtual one 
-- is up in something like 20 seconds.)  I *need* this stuff, which is 
lightweight in the extreme, to execute much earlier in the boot process 
than that."

I don't know why something would take forever just because it is in 
rc.local.

But as you say, and as I could say:

You can create a systemd "service" file in which "DefaultDependencies" 
is "no". Then you can add it to some earlier boot target by using the 
"WantedBy" clause in the "[Install]" section. Then you need to enable 
the service using "systemctl enable" at which point I believe the 
symlink will be made from the appropriate target to your new service.

The question on how to make the new service *stall* the boot sequence is 
different. Most of the time you want a service to be type "Oneshot" and 
for "RemainAfterExit" to be true, but I don't know.

I don't know why this service has to execute earlier. Or why that would 
speed it up.

I never asked ;-).

But I just think assuming knowledge on behalf of the question asker that 
to you makes the question incomprehensible, is a bit pointless.