podson.sh

# usage pods_on.sh <node1> <node2> <label1=value1> <label2=value2> <...> <kubectl_flags>
# example pods_on.sh node1 "ingress in (true)" -o wide
flags=(); nodes=(); k=true
for arg in "${@}"; do
	if [[ $arg == "-"* ]]; then k=false; fi
	$k && { [[ $arg == *"="* || $arg == *"("* ]] && nodes+=($(kubectl get nodes -l "$arg" -o jsonpath='{.items[*].metadata.name}')) || nodes+=($arg); } || flags+=($arg)
done

nodes=($(echo "${nodes[@]}" | tr ' ' '\n' | sort -u | tr '\n' ' '))

[ ${#nodes[@]} -eq 0 ] && { echo "No nodes found"; exit 1; }
[ ${#nodes[@]} -eq 1 ] && { kubectl get pods -A --field-selector spec.nodeName=${nodes[0]} ${flags[@]}; exit 0; }

# if multiple nodes, build a field selector with neq grep -v -E "(node1|node2)"
excludedNodes=($(kubectl get nodes -o jsonpath='{.items[*].metadata.name}' | tr ' ' '\n' | grep -v -E "($(echo ${nodes[@]} | tr ' ' '|'))" | tr '\n' ' '))
param=$(printf "spec.nodeName!=%s," "${excludedNodes[@]}" | sed 's/,$//')
kubectl get pods -A --field-selector $param ${flags[@]}