export POD_NAME=$(kubectl get pods --namespace default -l "app=ethereum-geth-tx,release=ethereum" -o jsonpath="{.items[0].metadata.name}")
The above doesn't work, at least at the current version.
It should be like this:
export POD_NAME=$(kubectl get pods --namespace default -l "app=ethereum,component=geth-tx" -o jsonpath="{.items[0].metadata.name}")