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Useful Scripts

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cleanup_ns.sh

To clean up all namespaced objects and eventually delete the namespace.

#!/bin/bash

ns=$1
if [[ -z "$ns" ]] ; then
  echo "Usage: $0 <NAMESPACE>"
  exit 1
fi

echo "---> namespace: $ns"

# Retrieve all potential namespaced types
all_types=$(kubectl api-resources --namespaced=true --verbs=delete -o name | tr "\n" "," | sed -e "s/,$//")
#all_types="helmreleases.apps.open-cluster-management.io"

# Retrieve all potential namespaced objects
all_objects=($(kubectl get "$all_types" -n $ns -o json | jq -r '.items[] | .apiVersion + ";" + .kind + ";" + .metadata.name'))
#echo "---> all_objects: ${all_objects[@]}"

# Iterate to delete all namespaced objects
tmpfile="$(mktemp /tmp/deleting-object.XXXXXX)"
for item in "${all_objects[@]}"; do
  k8s_kind1=$(echo "$item" | cut -d ";" -f 1 | cut -d "/" -f 1)
  k8s_kind2=$(echo "$item" | cut -d ";" -f 2)
  k8s_kind="$k8s_kind2.$k8s_kind1"            # make it a full name like TagLabelMap.infra.management.ibm.com
  k8s_name=$(echo "$item" | cut -d ";" -f 3)
  echo "---> kind:$k8s_kind; name: $k8s_name";

  # Remove the finalizers
  kubectl get "$k8s_kind/$k8s_name" -n $ns -o json | jq '.metadata.finalizers=[]' > "$tmpfile"

  # Replace the object with removed finalizers
  kubectl -n $ns replace -f "$tmpfile"

  # Finally delete it
  kubectl -n $ns delete "$k8s_kind/$k8s_name"
done

# delete the ns at the end
kubectl get ns $ns -o json | jq '.spec.finalizers=[]' > "$tmpfile"
kubectl replace --raw "/api/v1/namespaces/$ns/finalize" -f "$tmpfile"
kubectl delete ns $ns

rm "$tmpfile" || true

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Find out the CRDs

There are some default CRDs but sometimes it's important to find out what more CRDs are added after some specific installations.

For example, we can find out what CRDs have been installed within ROKS, with OCP v4.3.38_1544, by default:

The default CRDs in ROKS include:

We then can set a baseline as a file, say name _crds_roks.txt. After installation of RHACM, we can check what other CRDs have been added:

Then we would get a list like:

So if we want to check what extra CRDs are added, on top of the new baseline with ROKS + RHACM, do this:

And if one wants to delete those "extra" CRDs to reset something, do this:

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Clean Up ~/.kube/config

To clean up all kubeconfig within ~/.kube/config except docker-desktop:

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