Re: Features of installing package that works as service

[Joshua Branson <jbranso@fastmail.com>]

<znavko@tutanota.com> writes:

> Hello, Guix Help! I think GuixSD is cute, but manual is so incomprehensible https://www.gnu.org/software/guix/manual/en/guix.html 

Have you read the entire manual?  I know I haven't.  Before your
complain that the manual is difficult to understand, be sure that you
read all of it.  There's lots of good details in the manual. :)

>
> I want to clear all possible options when I install packages that work as services.
> For example, can get postgresql by typing by non-root user `$ guix package -i postgresql` and run it? How to run it?

If you intend to run it yourself, you can run that command.  But you
don't want to actually run guix package -i postgresql.

>
> Can I install postgresql and run it only when I need?
>
> Do I need install it only from defining service in config.scm and typing `# guix system reconfigure config.scm` ?

Basically yes.

https://www.gnu.org/software/guix/manual/en/guix.html#Database-Services

The (gnu services databases) module provides the following services. 

So your config would look a little like:

(use-modules (gnu services database))

...

;; your postgresql service definition here.
;; I think the below is correct, but I'm not certain.

(services (cons* 
(service postgresql-service-type)
%base-services
))

>
> Manual "6.2.15 Defining Services" has lot of variables and I do not know where to find them definitions.