logan2211/calico-hostendpoint-controller repository overview

This is a few minutes hack to manage calico hostendpoint resources when nodes are added or deleted.

Please note that the code is messy, names were not carefully chosen, directories for better organization might be missing, has several TODOs.

Also, another important consideration is that since a node start till the policy is applied, the node should not be exposed. This is not covered by this controller.

⁠Building

Depending on your architecture you would use one of the commands:

ARCH=amd64 docker build -t kinvolk/calico-hostendpoint-controller:v0.0.2-amd64 --build-arg ARCH . && docker push kinvolk/calico-hostendpoint-controller:v0.0.2-amd64
ARCH=arm64 docker build -t kinvolk/calico-hostendpoint-controller:v0.0.2-arm64 --build-arg ARCH . && docker push kinvolk/calico-hostendpoint-controller:v0.0.2-arm64

There are multiple ways for building an image for another architecture which is not your native OS architecture. The most convenient one is to install the qemu-user-static package on your system to set up binary translation so that the Linux kernel can run binaries for other architectures.

The downside of this approach is that a base image for the non-native architecture must be explicitly specified in the FROM directive of the Dockerfile instead of an image like debian:9, which is a multiarch image. For example, for building a Debian-based ARM64 image on an x86-64 machine you need to use arm64v8/debian:9 (prefixed because there is no debian:9-arm64).

When done building, you can change the Dockerfile back to the way it was before. Unfortunately the FROM directive does not handle build arguments.

Now make sure you have "experimental": "enabled" in your ~/.docker/config.json (surrounded by { and } if the file is otherwise empty).

When all images are built on the respective architectures and pushed they can be combined through a manifest to build a multiarch image:

docker manifest create kinvolk/calico-hostendpoint-controller:v0.0.2 --amend kinvolk/calico-hostendpoint-controller:v0.0.2-amd64 --amend kinvolk/calico-hostendpoint-controller:v0.0.2-arm64
docker manifest annotate kinvolk/calico-hostendpoint-controller:v0.0.2 kinvolk/calico-hostendpoint-controller:v0.0.2-amd64 --arch=amd64 --os=linux
docker manifest annotate kinvolk/calico-hostendpoint-controller:v0.0.2 kinvolk/calico-hostendpoint-controller:v0.0.2-arm64 --arch=arm64 --os=linux
docker manifest push kinvolk/calico-hostendpoint-controller:v0.0.2