Wednesday, 13 October 2021

Aiding my memory - parsing Kubernetes using JQ etc.

So I was looking for a way to munge a Kubernetes Compute Node configuration to extract it's external/public IP.

I know I can do it using purely K8s: -

kubectl get nodes -o jsonpath='{.items[*].status.addresses[?(@.type=="ExternalIP")].address}'

123.45.6.78

but I also wanted to do it via jq and here it is: -

kubectl get node `kubectl get nodes | tail -1 | awk '{print $1}'` --output json | jq -r '.status.addresses[] | select(.type=="ExternalIP") .address'

123.45.6.78

which is nice!

No comments:

TIL - read-only variables in Linux

 A co-worker was seeing an exception: -  line 8: TMOUT: readonly variable when trying to SCP a file from a remote Linux box. I did some digg...