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From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Guix "ops"
Date: Fri, 22 May 2015 18:06:52 +0200
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In-Reply-To: <87382oejz8.fsf@fsf.org> (David Thompson's message of "Fri, 22
	May 2015 10:59:39 -0400")
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To: David Thompson <dthompson2@worcester.edu>
Cc: guix-devel@gnu.org, Carlos Sosa <gnusosa@gnusosa.net>

David Thompson <dthompson2@worcester.edu> skribis:

> To take it for a spin, add something like this to a file, let's call it
> "deployment.scm":
>
>     (use-modules (gnu) (guix gexp))
>     (use-service-modules databases)
>     (use-package-modules web databases)
>=20=20=20=20=20
>     (define dummy-fs
>       (file-system
>         (mount-point "/")
>         (device "dummy")
>         (type "dummy")))
>=20=20=20=20=20
>     (define grub
>       (grub-configuration (device "/dev/sda")))
>=20=20=20=20=20
>     (define timezone "America/New_York")
>     (define locale "en_US.UTF-8")
>=20=20=20=20=20
>     ;; TODO: Needs nginx-service.
>     (define web-server
>       (machine
>        (name "web-server")
>        (system (operating-system
>                  (host-name "web-server")
>                  (timezone timezone)
>                  (locale locale)
>                  (bootloader grub)
>                  (file-systems
>                   (list dummy-fs %binary-format-file-system))
>                  (packages
>                   (cons nginx %base-packages))))
>        (platform (local-vm #:ip-address "10.0.2.10"))))
>=20=20=20=20=20
>     (define db-server
>       (machine
>        (name "db-server")
>        (system (operating-system
>                  (host-name "db-server")
>                  (timezone timezone)
>                  (locale locale)
>                  (bootloader grub)
>                  (file-systems
>                   (list dummy-fs %binary-format-file-system))
>                  (services
>                   (cons (postgresql-service)
>                         %base-services))
>                  (packages (cons postgresql %base-packages))))
>        (platform (local-vm #:ip-address "10.0.2.11"))))
>=20=20=20=20=20
>     (deployment
>      (name "test-deployment")
>      (machines (list web-server db-server)))
>=20=20=20=20=20
> Then run the following from your git checkout:
>
>     ./pre-inst-env guix deploy spawn /path/to/deployment.scm

Woow, that=E2=80=99s very nice.  The declarations are straightforward and
immediately understandable, I think, which is cool.

Perhaps one addition eventually would be to allow IPs to be
automatically allocated and have host name lookup DTRT in each VM.

> Now, there's still much work to be done.  Spawning local, temporary VMs
> has gotten me over some initial hurdles, but now we need to write a
> platform adapter for something more serious so that we can determine the
> requirements for "real world" deployment scenarios.  Perhaps we should
> look into writing an OpenStack adapter.

As discussed on IRC, I was unsure about OpenStack, but I=E2=80=99ll trust y=
our
judgment.  Maybe Cyril can comment?

Thanks,
Ludo=E2=80=99.