Create Debugging / Investigation Pod for Cluster problems

Problem

User wants to debug the kubernetes environment to check issues such as timeouts, dns errors etc

#Pull and Install a latest ubuntu pod 

cat <<EOF | kubectl apply -f –
apiVersion: v1
kind: Pod
metadata:
name: ubuntu
namespace: cert-manager
labels:
app: ubuntu
spec:
containers:
– image: ubuntu
command:
– “sleep”
– “604800”
imagePullPolicy: IfNotPresent
name: ubuntu
restartPolicy: Always

Note: Change your namespace according to your needs ( no namespace = default )

Login to your pod

kubectl exec -it ubuntu -n cert-manager /bin/bash

Update System  and install utils

apt install iputils-ping traceroute dnsutils tcpdump nmap curl wget jq python3.10 strace ssh telnet

Check Issues with resources in your cluster

Example:

kubectl exec -it ubuntu -n cert-manager /bin/bash

nslookup cert-manager-webhook

Attachment: commands.txt