ProxyJump and offload

ProxyJump and offload

[Jack Hill]

Hi Guix,

I'm tryng to set up offloading to a remote machine on a different network. 
The preffered way to access machines on the remote network is via 
openssh's ProxyJump option (as I understand it, this does some automated 
port forwarding to access the eventual remote host via the proxy host). To 
that end I've set up the following root ssh config in /root/.ssh/config:

```
Host proxy.remote.jackhill.us
      User jackhill

Host builder.jackhill.us
      User install
      ProxyJump proxy.remote.jackhill.us
```

and /etc/guix/machines.scm:

```
(list
(build-machine
   (name "builder.jackhill.us")
   (systems '("x86_64-linux"))
   (user "install")
   (host-key "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHls4Zn3WmWBdBCO43gmwJSd2afVzr980nQV4RLH/tw8 root@builder")
   (private-key "/root/.ssh/id_ed25519")))
```

With this configuration `sudo -E guix offload test` suceeds:

```
$ sudo -E guix offload test
guix offload: testing 1 build machines defined in '/etc/guix/machines.scm'...
guix offload: Guix is usable on 'builder.jackhill.us' (test returned "/gnu/store/883yjkl46dxw9mzykykmbs0yzwyxm17z-test")
guix offload: 'builder.jackhill.us' is running GNU Guile 3.0.5
guix offload: sending 1 store item (0 MiB) to 'builder.jackhill.us'...
exporting path `/gnu/store/xv5y6vb5rqivpgg8c23mmyifnbjx4zkg-export-test'
guix offload: 'builder.jackhill.us' successfully imported '/gnu/store/xv5y6vb5rqivpgg8c23mmyifnbjx4zkg-export-test'
retrieving 1 store item from 'builder.jackhill.us'...
guix offload: successfully imported '/gnu/store/0p7dz3ynp51qk4q9nvbscl5bv0hvfcsh-import-test' from 'builder.jackhill.us'
```

However, actually trying to build something that is not in my store fails:

```
$ guix build --no-substitutes okular
The following derivation will be built:
    /gnu/store/gcbhh3rbpmcr4p4rdvsj9cw48gwkhnlf-okular-20.12.1.drv
process 18275 acquired build slot '/var/guix/offload/builder.jackhill.us:22/0'
guix offload: error: failed to connect to 'builder.jackhill.us': Socket error: Connection reset by peer
waiting for locks or build slots...
^C
```

If I temporarily disable the need to use a proxy host and remove the ProxyJump line from my ssh config, then it works as expected:

```
$ guix build --no-substitutes okular
The following derivation will be built:
    /gnu/store/gcbhh3rbpmcr4p4rdvsj9cw48gwkhnlf-okular-20.12.1.drv
process 18551 acquired build slot '/var/guix/offload/builder.jackhill.us:22/0'
normalized load on machine 'builder.jackhill.us' is 0.01
building /gnu/store/gcbhh3rbpmcr4p4rdvsj9cw48gwkhnlf-okular-20.12.1.drv...
guix offload: sending 294 store items (286 MiB) to 'builder.jackhill.us'...
exporting path `/gnu/store/36dq4d3dba7z2vjiqsqphndn7sb2wmyj-kconfig-5.70.0-guile-builder'
…
```

What am I doing wrong?

Best,
Jack

Re: ProxyJump and offload

[Joshua Branson]

Jack Hill <jackhill@jackhill.us> writes:

> Hi Guix,
>
> If I temporarily disable the need to use a proxy host and remove the ProxyJump line from my ssh config, then it works as expected:
>
> ```
> $ guix build --no-substitutes okular
> The following derivation will be built:
>    /gnu/store/gcbhh3rbpmcr4p4rdvsj9cw48gwkhnlf-okular-20.12.1.drv
> process 18551 acquired build slot '/var/guix/offload/builder.jackhill.us:22/0'
> normalized load on machine 'builder.jackhill.us' is 0.01
> building /gnu/store/gcbhh3rbpmcr4p4rdvsj9cw48gwkhnlf-okular-20.12.1.drv...
> guix offload: sending 294 store items (286 MiB) to 'builder.jackhill.us'...
> exporting path `/gnu/store/36dq4d3dba7z2vjiqsqphndn7sb2wmyj-kconfig-5.70.0-guile-builder'
> …
> ```
>
> What am I doing wrong?

Maybe guix offloading does not support proxy jumping?  Just a wild
guess.  I've really no idea.  I've never done any off loading.

>
> Best,
> Jack
>

-- 
Joshua Branson (joshuaBPMan in #guix)
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