While there are more complete monitoring solutions (Portainer, Rancher), I just needed a simple script to show information on a single screen. This is a work in progress.
Running this script with the ‘watch’ command allows you to see a constantly updated screen.
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| watch -n 1 script_name.sh
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Script
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| #!/bin/bash
K=kubectl
G=grep
POD_file="pods.dat"
NODE_file="nodes.dat"
current_date=$(date)
all="--all-namespaces"
$K get pods -o wide --sort-by="spec.nodeName" > $POD_file
function bargraph () {
label="$1"
value="$2"
hide_if_zero="$3"
bar=$(printf "%${value}s\n" | tr " " "=")
printf "%20s %4s %s\n" $label $value $bar
}
function status_info () {
info="$1"
status_to_look_for="$2"
hide_if_zero="$3"
count=$(echo "$info" | sort | grep -i $status_to_look_for | wc -l)
count2=${count:-"0"}
if ! [[ $count2 == "0" && "$hide_if_zero" == "HIDE" ]]; then
bargraph "$status_to_look_for" "$count2"
fi
#bargraph "$status_to_look_for" "$count2"
}
function banner1 {
echo "============================================================================================"
echo "$1"
echo "--------------------------------------------------------------------------------------------"
}
function display_status {
banner1 "Status"
STATS=$(cat pods.dat | awk '{print $3}' | sed 's/^[[:space:]]*//' | tail -n +2)
status_info "$STATS" "ContainerCreating"
status_info "$STATS" "Pending"
status_info "$STATS" "Running"
status_info "$STATS" "Terminating"
status_info "$STATS" "Unknown" "HIDE"
status_info "$STATS" "Failed" "HIDE"
status_info "$STATS" "CrashLoopBackOff" "HIDE"
status_info "$STATS" "Completed" "HIDE"
status_info "$STATS" "ImagePullBackOff" "HIDE"
status_info "$STATS" "Succeeded" "HIDE"
echo -e
}
function display_pods {
banner1 "Pods"
cat $POD_file
echo -e
}
function display_num_pods {
banner1 "Number of pods running on each node"
$K get nodes $all --no-headers -o custom-columns=NAME:.metadata.name | sort | while read node; do
cmd="$G -c $node $POD_file"
count=$($cmd)
bargraph "$node" "$count"
done
echo -e
}
function display_nodes {
banner1 "Nodes"
$K get nodes -o wide > $NODE_file > $NODE_file
cat $NODE_file
echo -e
}
function display_node_metrics {
banner1 "Node Metrics"
$K top nodes --use-protocol-buffers
echo -e
}
function display_node_deployments {
banner1 "Deployments"
$K get deployments $all
echo -e
}
function display_service {
banner1 "Service"
$K get service $all
echo -e
}
function display_hpa
{
banner1 "HPAs"
$K get hpa -o wide
echo -e
}
#----------------------------------------------------------------------------------------------------------
echo "Today is $(date)"
echo -e
# Comment out sections or reorder them as needed
display_status
display_num_pods
#display_nodes
display_node_metrics
display_node_deployments
#display_pods
display_hpa
display_service
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Example output
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| Today is Sat 19 Nov 2022 09:15:06 PM UTC
============================================================================================
Status
--------------------------------------------------------------------------------------------
ContainerCreating 0
Pending 6 ======
Running 58 ==========================================================
Terminating 0
Unknown 0
Failed 0
CrashLoopBackOff 0
Completed 0
ImagePullBackOff 0
Succeeded 0
============================================================================================
Number of pods running on each node
--------------------------------------------------------------------------------------------
master1 0
worker1 19 ===================
worker2 20 ====================
worker3 19 ===================
============================================================================================
Node Metrics
--------------------------------------------------------------------------------------------
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY%
master1 396m 9% 1699Mi 44%
worker1 300m 7% 656Mi 17%
worker2 265m 6% 660Mi 17%
worker3 193m 4% 677Mi 17%
============================================================================================
HPAs
--------------------------------------------------------------------------------------------
NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE
php-apache Deployment/php-apache 5%/5% 1 100 63 4m51s
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