I once was tasked to setup a SaaS application in Kubernetes (short K8S). Everything went smoothly until I found out that some pod, spawned by the application, had to have their
/etc/hosts/ file adjusted.
So this is what I did
I created a
hosts file in my home directory containing the lines I wanted to add. Than I run:
The command executes an
echo on the pod and appends to output to
/etc/hosts. The tricky part is, what gets echoed. Before executing the shell, on your computer, replaces
$(cat·~/hosts·)'with the actual content of
~/hosts. This feature of a shell is called Command Substitution and is available in both Bash and Zsh.
Look ma no hands
If you want to run this on all pods labeled
foo=bar, you can use shell for loops:
Do not do these things in production. This tip is useful while testing and debugging but setting up your production environment should be completely automated.