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vfarcic/242-debug-containers.sh

Last active September 14, 2024 08:47
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242-debug-containers.sh
# Source: https://gist.github.com/vfarcic/9d9de2cf93b6514ab8cf8fed56542352
##################################################################
# How to Debug Kubernetes Applications With Ephemeral Containers #
# https://youtu.be/qKb6loAEPV0 #
##################################################################
# Additional Info:
# - Containers Are Not VMs! Which Base Container (Docker) Images Should We Use?: https://youtu.be/82ZCJw9poxM
# - Is Timoni With CUE a Helm Replacement?: https://youtu.be/bbE1BFCs548
#########
# Setup #
#########
# Create a Kubernetes cluster (any should do starting from
# v1.25).
# Please watch https://youtu.be/bbE1BFCs548 if you are not
# familiar with Timoni.
timoni --namespace demo apply silly-demo \
oci://c8n.io/vfarcic/silly-demo-package --version 1.4.37
export POD=$(kubectl --namespace demo get pods \
--selector app.kubernetes.io/name=silly-demo \
--output jsonpath='{.items[0].metadata.name}')
########
# Demo #
########
kubectl --namespace demo exec -it $POD -- sh
kubectl --namespace demo debug $POD --image alpine \
--stdin --tty --target silly-demo
ps aux
exit
kubectl --namespace demo get pod $POD --output yaml
kubectl --namespace demo debug $POD --image alpine \
--stdin --tty --share-processes --copy-to silly-demo-debug
ps aux
exit
kubectl --namespace demo delete pod silly-demo-debug
###########
# Destroy #
###########
# Destroy or reset the cluster.
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