Debugging Kubeflex

Useful Debugging Hacks

How to open a psql command in-cluster

kubectl run -i --tty --rm debug -n kubeflex-system --image=postgres --restart=Never -- bash
psql -h mypsql-postgresql.kubeflex-system.svc -U postgres

Forcing image update

This is useful when using a new image with same tag (not a best practice but may be useful for testing)

kubectl --context kind-kubeflex patch deployment kubeflex-controller-manager --namespace kubeflex-system --type='json' -p='[{"op": "replace", "path": "/spec/template/spec/containers/1/imagePullPolicy", "value": "Always"}]'
sleep 5
kubectl --context kind-kubeflex patch deployment kubeflex-controller-manager --namespace kubeflex-system --type='json' -p='[{"op": "replace", "path": "/spec/template/spec/containers/1/imagePullPolicy", "value": "IfNotPresent"}]'

Installing the helm chart from the local repo

helm upgrade --install kubeflex-operator chart --namespace kubeflex-system --set domain=localtest.me --set externalPort=9443

How to view certs info

openssl x509 -noout -text -in certs/apiserver.crt 

Manually creating the configmap with KubeFlex defaults

kubectl create configmap kubeflex-config -n kubeflex-system --from-literal=externalPort=9443 --from-literal=domain=localtest.me

Get decoded value from secret

NAMESPACE= # your namespace
NAME= # your secret name
kubectl get secrets -n ${NAMESPACE} ${NAME} -o jsonpath='{.data.apiserver\.crt}' | base64 -d

How to attach an ephemeral container to debug

NAMESPACE= # your namespace
NAME= # pod name
CONTAINER= # container name
IMAGE=ubuntu:latest
kubectl debug -n ${NAMESPACE} -it ${NAME} --image=${IMAGE} --target=${CONTAINER} -- bash
# e.g. kubectl debug -n ${NAMESPACE} -it ${NAME} --image=curlimages/curl:8.1.2 --target=${CONTAINER} -- sh

Getting all the command args for a process

cat /proc//cmdline | sed -e "s/\x00/ /g"; echo

How to communicate between kind clusters on the same node approach that is independent of local machine IP is to use the internal DNS address of

docker containers. The address is the name of the docker container. For kubeflex that address is kubeflex-control-plane. For example, if I have a nodeport service on kubeflex-control-plane with port 30080 and I want to access it from another kind cluster the internal address to use is https://kubeflex-control-plane:30080