Kubernetes pod deployment status polling script for ci-pipelines

wait_till_pod_ready.sh

#!/bin/bash

# #############################################################################
#
# Helper script used to poll one or more pods for their running status. 
#
# #############################################################################

DEFAULT_POLL_MAX_COUNT=20
DEFAULT_POLL_SLEEP_IN_SECONDS=5

function usage(){
    echo "Poll for the running status of one or more pods."
    echo "usage: $0 -c kubernetes context file -n name space -s service name [-h]"
}

function error {
    echo -e "$1" >&2
    exit 1
}

while [[ "$#" -gt 0 ]]; do case $1 in
  -c|--config-file) config_file="$2"; shift;;
  -n|--namespace) namespace="$2"; shift;;
  -s|--service-name) service_name="$2"; shift;;
  -h|--help) usage; exit 0;;
  *) error "Unknown parameter passed: $1";;
esac; shift; done

[[ -z "$config_file" ]] && error "Config file for Kubernetes cluster not set, aborting!"
[[ -z "$service_name" ]] && error "Service name not set, aborting!"
[[ -z "$namespace" ]] && namespace="default" && echo "Target namespace not set, will use [default]!"

command_get_pods="kubectl get pods --namespace $namespace --kubeconfig $config_file | grep \"$service_name\""
command_notready_count="$command_get_pods | grep \"0/\" | wc -l"
command_crashed="$command_get_pods | grep \"Crash\""
command_crashed_count="$command_crashed | wc -l"

notready=$(eval $command_notready_count)
crashed=$(eval $command_crashed_count)
iteration=0
while (( $notready > 0 )) && (( $iteration < $DEFAULT_POLL_MAX_COUNT )); do
  echo "#Pods not ready: $notready / Crashed: $crashed"
  eval $command_crashed
  sleep $DEFAULT_POLL_SLEEP_IN_SECONDS
  notready=$(eval $command_notready_count)
  crashed=$(eval $command_crashed_count)
  iteration=$(( iteration + 1 ))
done

echo "#Pods not ready: $notready / Crashed: $crashed"

if (( $notready > 0 )); then
  echo "Timeout while waiting for pod(s)"
  eval $command_crashed
  exit -1
else
  eval $command_get_pods
  echo "All pods are ready, have fun!"
fi