Get all the GKE contexts available for you authenticted account

get-gcloud-gke-contexts.sh

#!/bin/bash

LOCAL_EXIT_CODE=0

# Get a list of projects from Gcloud
PROJECTS=($(gcloud projects list --format="value(projectId)"))

# Create a directory to split clusters kubeconfig files later
mkdir -p "${HOME}/.kube/clusters"

# Loop the projects
for PROJECT in "${PROJECTS[@]}"; do

  echo "Selecting project: ${PROJECT}"
  gcloud config set project "${PROJECT}" --verbosity=none

  # Get list of clusters for this project
  CLUSTERS=($(gcloud container clusters list --project="$PROJECT" --format="csv[separator='@',no-heading](name,zone)"))

  # Look the clusters' list. Configure contexts
  for CLUSTER_ZONE in "${CLUSTERS[@]}"; do

    # Split zone and cluster name
    CLUSTER=$(echo "${CLUSTER_ZONE}" |  cut -d'@' -f1)
    ZONE=$(echo "${CLUSTER_ZONE}" |  cut -d'@' -f2)

    echo "Cluster found. Adopting its context [ cluster: ${CLUSTER}, zone: ${ZONE} ]"

    # Configure the context for current cluster
    export KUBECONFIG="${HOME}/.kube/clusters/${PROJECT}__${ZONE}__${CLUSTER}"
    gcloud container clusters get-credentials "$CLUSTER" --project="$PROJECT" --zone="$ZONE" || LOCAL_EXIT_CODE=$?
      #--user-output-enabled --verbosity=debug || LOCAL_EXIT_CODE=$?

    if [[ "${LOCAL_EXIT_CODE}" -ne 0 ]]; then
      echo "[···] Context not retrieved. Skipping operation for it.";
      continue
    fi

  done
done

# Throw an advise
printf "Hey, put this on your .bashrc or .zshrc file: \n\n%s" "
# [CUSTOM] Show kubectl where to find our kubeconfig files
export KUBECONFIG=\$(find ~/.kube/clusters -type f | sed ':a;N;s/\n/:/;ba')
"