#52511 service networking provided more than once

Message #5 received at submit@debbugs.gnu.org (full text, mbox, reply):

From: Mathieu Othacehe <othacehe@gnu.org>

To: bug-guix@gnu.org

Subject: service networking provided more than once

Date: Wed, 15 Dec 2021 14:04:32 +0100

Hello,

When using this service:

--8<---------------cut here---------------start------------->8---
(service static-networking-service-type
          (list (static-networking
                 (addresses
                  (list
                   ;; Connection to the DMZ for public access
                   ;; This is a 10G port.
                   (network-address
                    (device "eno2")
                    (value "141.80.181.40/24"))))
                 (routes
                  (list (network-route
                         (destination "default")
                         (gateway "141.80.181.1")))))
                (static-networking
                 (addresses
                  (list
                   ;; Connection to build nodes
                   (network-address
                    (device "eno1")
                    (value "141.80.167.131/26")))))))
--8<---------------cut here---------------end--------------->8---

I have the following error message:

--8<---------------cut here---------------start------------->8---
service networking provided more that once
--8<---------------cut here---------------end--------------->8---

I guess it boils down to tweak the "provision" field accordingly, but it
should be automated or documented properly.

Thanks,

Mathieu

Message #10 received at 52511@debbugs.gnu.org (full text, mbox, reply):

From: Ludovic Courtès <ludo@gnu.org>

To: Mathieu Othacehe <othacehe@gnu.org>

Cc: 52511@debbugs.gnu.org

Subject: Re: bug#52511: service networking provided more than once

Date: Wed, 15 Dec 2021 14:28:36 +0100

Hi!

Mathieu Othacehe <othacehe@gnu.org> skribis:

> When using this service:
>
> (service static-networking-service-type
>           (list (static-networking
>                  (addresses
>                   (list
>                    ;; Connection to the DMZ for public access
>                    ;; This is a 10G port.
>                    (network-address
>                     (device "eno2")
>                     (value "141.80.181.40/24"))))
>                  (routes
>                   (list (network-route
>                          (destination "default")
>                          (gateway "141.80.181.1")))))
>                 (static-networking
>                  (addresses
>                   (list
>                    ;; Connection to build nodes
>                    (network-address
>                     (device "eno1")
>                     (value "141.80.167.131/26")))))))
>
>
> I have the following error message:
>
> service networking provided more that once
>
> I guess it boils down to tweak the "provision" field accordingly, but it
> should be automated or documented properly.

In this particular case, you could/should have a single
‘static-networking’ with multiple addresses:

  (static-networking
    (addresses
      (list (network-address …)
            (network-address …)))
    (routes …))

I’m not sure if there are other situations where this limitation is
problematic.

WDYT?

Thanks,
Ludo’.

Message #13 received at 52511@debbugs.gnu.org (full text, mbox, reply):

From: Mathieu Othacehe <othacehe@gnu.org>

To: Ludovic Courtès <ludo@gnu.org>

Cc: 52511@debbugs.gnu.org

Subject: Re: bug#52511: service networking provided more than once

Date: Wed, 15 Dec 2021 14:50:35 +0100

Hey,

> In this particular case, you could/should have a single
> ‘static-networking’ with multiple addresses:
>
>   (static-networking
>     (addresses
>       (list (network-address …)
>             (network-address …)))
>     (routes …))

Oh, I see. There's still something problematic:

--8<---------------cut here---------------start------------->8---
;; Connection to the DMZ for public access
;; This is a 10G port.
(static-networking-service "eno2"
                           "141.80.181.40"
                           #:netmask "255.255.255.0"
                           #:gateway "141.80.181.1")
;; Connection to build nodes
(static-networking-service "eno1"
                           "141.80.167.131"
                           #:netmask "255.255.255.192")
--8<---------------cut here---------------end--------------->8---

The above configuration used to create two distinct shepherd services:
networking-eno1 and networking-eno2.

We now have the aforementioned error because those two interfaces are
now provisioning 'networking, breaking compatibility.

Browsing the code, I also found:

--8<---------------cut here---------------start------------->8---
(service static-networking-service-type
         (list %loopback-static-networking

               ;; QEMU user-mode networking.  To get "eth0", you need
               ;; QEMU to emulate a device for which Mach has an
               ;; in-kernel driver, for instance with:
               ;; --device rtl8139,netdev=net0 --netdev user,id=net0
               %qemu-static-networking))
--8<---------------cut here---------------end--------------->8---

which made me think that creating a distinct static-networking record
per interface was the way to go.

Thanks,

Mathieu

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