Processing kubectl YAML Output with yq

README.md

Processing kubectl YAML Output with yq

Source code of snippets included as screenshots at https://mannymon.medium.com/processing-kubectl-yaml-output-with-yq-bf0dc98ddeab

add-comment.sh

kubectl get ns kube-system -o yaml \
  | yq e '.metadata.annotations.istio-injection lineComment="Configures istio automatic sidecar injection. See https://istio.io/latest/docs/setup/additional-setup/sidecar-injection/"' - \
  | grep '#.*'

add-field.sh

kubectl get ns kube-system -o yaml \
  | yq e '.metadata.annotations.istio-injection |= "disabled"' - \
  | kubectl apply -f -

pretty-print.sh

kubectl get ns kube-system -o yaml | yq e '.'

remove-fields.sh

kubectl get ns kube-system -o yaml | yq e 'del(
  .metadata.annotations."kubectl.kubernetes.io/last-applied-configuration",
  .metadata.creationTimestamp,
  .metadata.managedFields,
  .metadata.resourceVersion,
  .metadata.selfLink,
  .metadata.uid,
  .status)' -

to-json.sh

kubectl get ns kube-system -o yaml | yq e -j 'del(
  .metadata.annotations."kubectl.kubernetes.io/last-applied-configuration",
  .metadata.creationTimestamp,
  .metadata.managedFields,
  .metadata.resourceVersion,
  .metadata.selfLink,
  .metadata.uid,
  .status)' - | jq '.'

update-field.sh

kubectl get ns kube-system -o yaml \
  | yq e '.metadata.annotations.istio-injection |= "enabled"' - \
  | kubectl apply -f -