Kubernetes Flash Cards

While learning to use Kubernetes, I figured I could make flash cards of the concepts. Here are the first ones. What do you think?

Pushing to docker registry running in Kubernetes cluster from Docker Mac

Goal

Push local images from Docker Mac to a remote Docker registry running in a Kubernetes cluster on AWS

Solution

Get ip of your machine (thats the one that docker engine can reach)
$ local_ip=$(ipconfig getifaddr en0)

Define registry.example.com as  in /etc/hosts

  local_ip registry.example.com

Alias lo0 with registration.example.com defined as local_ip in hosts

https://docs.docker.com/docker-for-mac/networking/#use-cases-and-workarounds

I WANT TO CONNECT FROM A CONTAINER TO A SERVICE ON THE HOSTThe Mac has a changing IP address (or none if you have no network access). Our current recommendation is to attach an unused IP to the lo0 interface on the Mac; for example: sudo ifconfig lo0 alias 10.200.10.1/24, and make sure that your service is listening on this address or 0.0.0.0 (ie not 127.0.0.1). Then containers can connect to this address.

$ sudo ifconfig lo0 alias registration.example.com/24

Tunnel :5000 to registry DNS 

$ ssh -N -p 22 user@bastion -L local_ip:5000:registry.example.com:5000

Add local_ip:5000 to docker daemon config insecure registries;

save and restart docker daemon

Push to registration.example.com

$ docker tag example-base registration.example.com:5000/example-base
$ docker push registry.example.com:5000/example-base

References

https://github.com/moby/moby/issues/29608
https://docs.docker.com/docker-for-mac/networking/#use-cases-and-workarounds