Feature: ARM64 ARMv7 and ARMv6 docker support

[erwineverts]

I would love running this service on a raspberry pi.

I found this blog post that enables GitHub Actions docker multi-arch support.
https://sosedoff.com/2023/01/11/multiarch-docker-images-with-github-actions.html

[davechallis]

Should be doable! I'm planning to add more build automation/integration with Docker hub at some point soon, have just been massively behind on free time lately.

[erwineverts]

Let me know if and how I can help in any way. I have quite some experience with CICD using GitLab and Jenkins, so diving into Github Actions could be fun.

[davechallis]

I've made a quick start in the actions-updates branch which does a multiarch build/push.

It's only implemented for that branch and uses a temporary dev tag for now, as it needs some more work to integrate with the normal testing/push workflow.

For now if you wanted to test the multiarch images, you can use davechallis/ocypod:dev, which was build for amd64, arm64, arm/v6, and arm/v7.

[erwineverts]

Awesome, I'll will test them this weekend

[erwineverts]

On my RP2 (ARMv7) is still has issues using the example docker-compose with the dev tag.

This is the output:

docker-compose up
Pulling ocypod (davechallis/ocypod:dev)...
dev: Pulling from davechallis/ocypod
6fb81ff47bd6: Pull complete
13db6b952c5c: Pull complete
Digest: sha256:24924b72a302cc4e875e9b4996ea18abfad3405fedc0fdbd3c0720583118689e
Status: Downloaded newer image for davechallis/ocypod:dev
Starting ocypod-redis-docker_ocypod-redis_1 ... done
Recreating ocypod-redis-docker_ocypod_1     ... done
Attaching to ocypod-redis-docker_ocypod-redis_1, ocypod-redis-docker_ocypod_1
ocypod-redis_1  | 1:C 17 Mar 2023 19:18:17.855 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
ocypod-redis_1  | 1:C 17 Mar 2023 19:18:17.855 # Redis version=6.2.11, bits=32, commit=00000000, modified=0, pid=1, just started
ocypod-redis_1  | 1:C 17 Mar 2023 19:18:17.855 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
ocypod_1        | standard_init_linux.go:228: exec user process caused: exec format error
ocypod-redis_1  | 1:M 17 Mar 2023 19:18:17.867 * monotonic clock: POSIX clock_gettime
ocypod-redis_1  | 1:M 17 Mar 2023 19:18:17.869 # Warning: 32 bit instance detected but no memory limit set. Setting 3 GB maxmemory limit with 'noeviction' policy now.
ocypod-redis_1  | 1:M 17 Mar 2023 19:18:17.870 * Running mode=standalone, port=6379.
ocypod-redis_1  | 1:M 17 Mar 2023 19:18:17.871 # Server initialized
ocypod-redis_1  | 1:M 17 Mar 2023 19:18:17.872 # WARNING Memory overcommit must be enabled! Without it, a background save or replication may fail under low memory condition. Being disabled, it can can also cause failures without low memory condition, see https://github.com/jemalloc/jemalloc/issues/1328. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
ocypod-redis_1  | 1:M 17 Mar 2023 19:18:17.876 * Loading RDB produced by version 6.2.11
ocypod-redis_1  | 1:M 17 Mar 2023 19:18:17.877 * RDB age 36 seconds
ocypod-redis_1  | 1:M 17 Mar 2023 19:18:17.877 * RDB memory usage when created 0.63 Mb
ocypod-redis_1  | 1:M 17 Mar 2023 19:18:17.877 # Done loading RDB, keys loaded: 0, keys expired: 0.
ocypod-redis_1  | 1:M 17 Mar 2023 19:18:17.877 * DB loaded from disk: 0.002 seconds
ocypod-redis_1  | 1:M 17 Mar 2023 19:18:17.877 * Ready to accept connections
ocypod-redis-docker_ocypod_1 exited with code 1
^CGracefully stopping... (press Ctrl+C again to force)
Stopping ocypod-redis-docker_ocypod-redis_1 ... done

When I inspect the container it give the correct architecture: arm v7. But the digest is different than the one on that particular version on docker hub.

docker inspect davechallis/ocypod:dev 
[
    {
        "Id": "sha256:293acbdd4c6ee47003a1f97fdde4f3c971ad677cf11e6f472caabe8cffb3e045",
        "RepoTags": [
            "davechallis/ocypod:dev"
        ],
        "RepoDigests": [
            "davechallis/ocypod@sha256:24924b72a302cc4e875e9b4996ea18abfad3405fedc0fdbd3c0720583118689e"
        ],
        "Parent": "",
        "Comment": "buildkit.dockerfile.v0",
        "Created": "2023-03-17T17:06:49.808132248Z",
        "Container": "",
        "ContainerConfig": {
            "Hostname": "",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": null,
            "Cmd": null,
            "Image": "",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": null
        },
        "DockerVersion": "",
        "Author": "",
        "Config": {
            "Hostname": "",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "ExposedPorts": {
                "8023/tcp": {}
            },
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
            ],
            "Cmd": null,
            "Image": "",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": [
                "/usr/local/bin/ocypod-server"
            ],
            "OnBuild": null,
            "Labels": null
        },
        "Architecture": "arm",
        "Variant": "v7",
        "Os": "linux",
        "Size": 19454400,
        "VirtualSize": 19454400,
        "GraphDriver": {
            "Data": {
                "LowerDir": "/var/lib/docker/overlay2/b131d3f5c6103561bd4e9c472386eb2243081b40b7e116dd05436a68e0f7ed7f/diff",
                "MergedDir": "/var/lib/docker/overlay2/503ea28b747e1a2dd24bb98ae7077bcd536344037037fdc312c812eef2cf3daf/merged",
                "UpperDir": "/var/lib/docker/overlay2/503ea28b747e1a2dd24bb98ae7077bcd536344037037fdc312c812eef2cf3daf/diff",
                "WorkDir": "/var/lib/docker/overlay2/503ea28b747e1a2dd24bb98ae7077bcd536344037037fdc312c812eef2cf3daf/work"
            },
            "Name": "overlay2"
        },
        "RootFS": {
            "Type": "layers",
            "Layers": [
                "sha256:e5a10d101f18e82086c6b968e40cfb90a00be5061717c988291db79ad367bdcf",
                "sha256:8ad08e797e8d8854953834f3bdd04edbfaa35b3cde86c1fab05a0786bde0f531"
            ]
        },
        "Metadata": {
            "LastTagTime": "0001-01-01T00:00:00Z"
        }
    }
]

This is the digest on docker hub: sha256:cfe58474dfd030d382e5f8a4dce22736a39447c35e6add0408c3b166e133a997
https://hub.docker.com/layers/davechallis/ocypod/dev/images/sha256-cfe58474dfd030d382e5f8a4dce22736a39447c35e6add0408c3b166e133a997?context=explore

I will still try this out on arm64 this weekend, I'm running nomad there so it takes a bit more converting time than simple docker-compose.

Thanks anyway for starting this for ARM

[erwineverts]

I guess the issue is the base image in the DockerFile in the builder base image clux/muslrust. It's amd64 only 😢

[davechallis]

Thanks for testing, and good spot. I'll try and take another look sometime this week, hopefully there's an alternative build option (worst case would be using separate Dockerfiles for arm/non-arm builds).

[erwineverts]

I've been working on this a bit: master...erwineverts:ocypod:master

Still getting a weird error:

# docker-compose up
ocypod_1        | standard_init_linux.go:228: exec user process caused: no such file or directory
ocypod-redis-docker_ocypod_1 exited with code 1

Usually this means that the file has windows line endings, but I couldn't find any.