Why trying to get InternalIP with custom columns doesn’t work but with jsonpath . . .

Kubernetes
#1

Andres Caro:
Why trying to get InternalIP with custom columns doesn’t work but with jsonpath works fine?
a) with custom-columns:

controlplane $ k get no -o custom-columns=NODE:metadata.name,INTERNAL_IP:status.addresses[?(@.type == "InternalIP")].address
NODE   INTERNAL_IP
error: unrecognized identifier InternalIP

b) with jsonpath:

controlplane $ k get no -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.addresses[?(@.type == "InternalIP")].address}{"\n"}{end}'
controlplane    172.17.0.8
node01  172.17.0.9
#2

Pranay:
you need to escape it with “\”

controlplane $ kubectl get no -o custom-columns=NODE:metadata.name,INTERNAL_IP:status.addresses[?(@.type == \"InternalIP\")].address
NODE               INTERNAL_IP
k3d-k8s-agent-0    172.19.0.3
k3d-k8s-agent-1    172.19.0.4
k3d-k8s-server-0   172.19.0.2
#3

Andres Caro:
Hey, Pranay thank you so much! that was the thing

#4

Andres Caro:
Another way is quoting the expression:

controlplane $ k get no -o custom-columns=NODE:.metadata.name,'INTERNAL_IP:.status.addresses[?(@.type=="InternalIP")].address'
NODE           INTERNAL_IP
controlplane   172.17.0.15
node01         172.17.0.17