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| -rw-r--r-- | lume/src/notes/2024/docker-build-over-ssh.mdx | 67 |
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diff --git a/lume/src/notes/2024/docker-build-over-ssh.mdx b/lume/src/notes/2024/docker-build-over-ssh.mdx new file mode 100644 index 0000000..6fa759a --- /dev/null +++ b/lume/src/notes/2024/docker-build-over-ssh.mdx @@ -0,0 +1,67 @@ +--- +title: "Docker builds over SSH" +desc: "Plan 9 clustering at home" +date: 2024-10-18 +tags: + - docker + - ssh + - devops +--- + +While on stream today, SlyEcho pointed out that you can set `DOCKER_HOST=ssh://...` to have the Docker client seamlessly do builds and the like over SSH instead of using the local computer's Docker daemon. In the process of playing with this, I found the [`docker context`](https://docs.docker.com/engine/manage-resources/contexts/) command. This is cool as hell, it allows you to manage multiple Docker daemons the same way that you would with Kubernetes clusters. + +For example, here's what it looks like by default on Linux: + +``` +$ docker context ls +NAME DESCRIPTION DOCKER ENDPOINT ERROR +default * Current DOCKER_HOST based configuration unix:///var/run/docker.sock +``` + +You can add contexts with the `docker context create` command, and also point those contexts to remote hosts over SSH: + +``` +docker context create \ + --docker host=ssh://cadey@pneuma \ + --description "Iustorum autem semita quasi lux splendens procedit et crescit usque ad perfectam diem" \ + pneuma +``` + +Then whenever you need to deal with the remote host for a command: + +``` +docker --context pneuma pull alpine:edge +``` + +You can set it as the default with `docker context use`: + +``` +docker context use pneuma +``` + +And then whenever you're doing something with Docker, it will seamlessly SSH into the machine `pneuma`, do the operation, and then return the result. This works for building and running containers too: + +``` +$ hostname +shiroko + +$ docker run -it --rm --network host alpine:edge +# hostname +pneuma +``` + +This even works for tools like [Earthly](https://earthly.dev): + +``` +$ earthly +all +(...) + +$ docker images +REPOSITORY TAG IMAGE ID CREATED SIZE +ghcr.io/xe/site/bin earthly 828d989bb3b3 2 minutes ago 263MB +ghcr.io/xe/site/patreon latest 9d3e945e7d6f 2 minutes ago 23.8MB +``` + +This means that even though I've somehow broken the Docker desktop app on my gaming PC that I stream from, I can still use Docker via one of my homelab machines! + +This is cool as hell! |