rancher-agent for arm32

notes.md

These are instructions for building rancher-agent for arm32. If we start doing this regularly we'll need to standup CI, but for now doing it manually is good enough.

I suspect the reason that rancher-agent isn't supported for arm32 is because rancher proper (aka make build-server) doesn't compile for arm32 (with error constant 4294967295 overflows int). However, the agent (aka make build-agent) builds fine.

Cross-compilation isn't quite straightforward in these projects, so they've been tweaked (and a bug fixed).

rancher-agent's Dockerfile.agent pulls binaries from upstream dependencies that don't exist for arm32, so we have to build them manually.

share-mnt:

1. git clone https://github.com/paleozogt/rancher-share-mnt.git
2. cd rancher-share-mnt
3. git checkout multiarch-v1.0.7
4. dapper build arm
5. file bin/share-mnt

loglevel:

1. git clone https://github.com/paleozogt/rancher-loglevel.git
2. cd rancher-loglevel
3. git checkout multiarch-v0.1.3
4. dapper build arm
5. file bin/loglevel

rancher-agent:

1. git clone https://github.com/paleozogt/rancher
2. cd rancher
3. git checkout multiarch-v2.4.3
4. dapper build-agent arm
5. file bin/agent
6. cp bin/agent package
7. cp ../rancher-loglevel/bin/loglevel package
8. cp ../rancher-share-mnt/bin/share-mnt package
9. cd package
10. docker build --build-arg VERSION=v2.4.3 --build-arg ARCH=arm --build-arg IMAGE_ARCH=arm32v7 -t paleozogt/rancher-agent:v2.4.3-arm -f Dockerfile.agent .
11. docker push paleozogt/rancher-agent:v2.4.3-arm

multi-arch image (use the official amd64/arm64 images along with our custom-built arm32 image):

1. docker pull --platform linux/amd64 rancher/rancher-agent:v2.4.3
2. docker tag rancher/rancher-agent:v2.4.3 paleozogt/rancher-agent:v2.4.3-amd64
3. docker push paleozogt/rancher-agent:v2.4.3-amd64
4. docker rmi rancher/rancher-agent:v2.4.3
5. docker pull --platform linux/arm64 rancher/rancher-agent:v2.4.3
6. docker tag rancher/rancher-agent:v2.4.3 paleozogt/rancher-agent:v2.4.3-arm64
7. docker push paleozogt/rancher-agent:v2.4.3-arm64
8. docker rmi rancher/rancher-agent:v2.4.3
9. docker manifest create paleozogt/rancher-agent:v2.4.3 paleozogt/rancher-agent:v2.4.3-amd64 paleozogt/rancher-agent:v2.4.3-arm64 paleozogt/rancher-agent:v2.4.3-arm
10. docker manifest push paleozogt/rancher-agent:v2.4.3