Show aks pods by node

pods_by_node.sh

#!/usr/bin/env bash

set -euo pipefail

readonly temp_dir=$( mktemp -d )

# sudo kubectl get pods
# NAME                                READY   STATUS    RESTARTS   AGE
# azure-vote-back-655476c7f7-gvg7b    1/1     Running   0          24m
# azure-vote-front-7f98fd48d4-8fkcd   1/1     Running   0          18m
# azure-vote-front-7f98fd48d4-l2848   1/1     Running   0          13m
# azure-vote-front-7f98fd48d4-xzd7c   1/1     Running   0          13m
is_valid_pod() {
	local -r pod_name=$1

	local -r filename="${temp_dir}/pods.txt"
	if [ ! -f "${filename}" ]; then
		touch "${filename}"
		sudo kubectl get pods | tail -n +2 > "${filename}"
	fi

	grep "${pod_name}" "${filename}" > /dev/null
}

# sudo kubectl get pod -o=custom-columns=NAME:.metadata.name,STATUS:.status.phase,NODE:.spec.nodeName --all-namespaces
# NAME                                   STATUS    NODE
# azure-vote-back-655476c7f7-gvg7b       Running   aks-nodepool1-30647309-3
# azure-vote-front-7f98fd48d4-8fkcd      Running   aks-nodepool1-30647309-0
# azure-vote-front-7f98fd48d4-l2848      Running   aks-nodepool1-30647309-3
# azure-vote-front-7f98fd48d4-xzd7c      Running   aks-nodepool1-30647309-1
# heapster-7866db774d-wqlmx              Running   aks-nodepool1-30647309-0
# kube-dns-v20-b8ff799f7-274tl           Running   aks-nodepool1-30647309-0
# kube-dns-v20-b8ff799f7-ws8jd           Running   aks-nodepool1-30647309-3
# kube-proxy-j4975                       Running   aks-nodepool1-30647309-1
# kube-proxy-qk9dl                       Running   aks-nodepool1-30647309-3
# kube-proxy-rzj9c                       Running   aks-nodepool1-30647309-0
# kube-svc-redirect-b26ck                Running   aks-nodepool1-30647309-3
# kube-svc-redirect-p75np                Running   aks-nodepool1-30647309-1
# kube-svc-redirect-s24d7                Running   aks-nodepool1-30647309-0
# kubernetes-dashboard-cb6558ddb-2l5wg   Running   aks-nodepool1-30647309-3
# metrics-server-d576554d8-78x26         Running   aks-nodepool1-30647309-1
# tunnelfront-67fb9d698b-wrhzl           Running   aks-nodepool1-30647309-3
print_pods() {
	local -r node_name=$1

	local -r filename="${temp_dir}/pods_full.txt"
	if [ ! -f "${filename}" ]; then
		touch "${filename}"
		sudo kubectl get pod -o=custom-columns=NAME:.metadata.name,STATUS:.status.phase,NODE:.spec.nodeName --all-namespaces | tail -n +2 > "${filename}"
	fi

	for pod_name in $( grep "${node_name}" "${filename}" | awk '{print $1;}' ); do
		if is_valid_pod "${pod_name}"; then
			echo "    ${pod_name}"
		fi
	done
}

# sudo kubectl get nodes
# NAME                       STATUS   ROLES   AGE   VERSION
# aks-nodepool1-30647309-0   Ready    agent   20m   v1.10.9
# aks-nodepool1-30647309-1   Ready    agent   14m   v1.10.9
# aks-nodepool1-30647309-3   Ready    agent   26m   v1.10.9
print_nodes() {
	local -r filename="${temp_dir}/nodes.txt"
	if [ ! -f "${filename}" ]; then
		touch "${filename}"
		sudo kubectl get nodes | tail -n +2 > "${filename}"
	fi

	for node in $( cat "${filename}" | awk '{print $1;}' ); do
		echo "[${node}]"
		print_pods "${node}"
		echo
	done
}

main() {
	print_nodes
	rm -rf "${temp_dir}"
}

main