kubectl patch'ing keys containing forward slash

December 22, 2023

I wanted to use kubectl to (JSON) patch an Ingress. The value needing patching is an annotation tailscale.com/funnel.

TL;DR The Stack overflow answer has the solution: replace / with ~1

With apologies for using YAML instead of JSON:

Ingress:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    tailscale.com/funnel: "true"

The solution becomes:

VALUE="true" # Or "false"

# Pretty-printed for clarity
PATCH="
[
    {
        'op':'replace',
        'path':'/metadata/annotations/tailscale.com~1funnel',
        'value':'${VALUE}'
    }
]"

kubectl patch ingress/${INGRESS} \
--namespace=${NAMESPACE} \
--context=${CONTEXT} \
--type=json \
--patch="${PATCH}"

Kubectl