Rancher in KIND (Rancher in Kubernetes-in-Docker)

rkind.sh

#!/usr/bin/env bash
#
# RKIND is a naive helper script to start KIND and Rancher Management Server
#

set -e
set -u
set -o pipefail

RANCHER_CONTAINER_NAME="rancher-for-kind"
RANCHER_HTTP_HOST_PORT=$[$[RANDOM%9000]+30000]
RANCHER_HTTPS_HOST_PORT=$[$[RANDOM%9000]+30000]
KIND_CLUSTER_NAME="kind-for-rancher"


case $(uname -s) in
  Darwin)
    localip="$(ipconfig getifaddr en0)"
  ;;
  Linux)
    localip="$(hostname -i)"
  ;;
  *)
    echo >&2 "Unsupported OS, exiting.."
    exit 1
  ;;
esac

# check docker binary availability
if ! which docker >/dev/null; then
  echo >&2 "Docker binary cannot be found in PATH"
  echo >&2 "Install Docker or check your PATH, exiting.."
  exit 1
fi

# check KIND binary availability
if ! which kind >/dev/null; then
  echo >&2 "KIND binary is missing"
  echo >&2 "Install it with \"go get sigs.k8s.io/kind\""
  echo >&2 "Or download appropriate binary from https://github.com/kubernetes-sigs/kind/releases"
  echo >&2 "For more details see:"
  echo >&2 " - https://kind.sigs.k8s.io"
  echo >&2 " - https://github.com/kubernetes-sigs/kind"
  echo >&2 "exiting.."
  exit 1
fi

if [[ "${1:-}" == "cleanup" ]]; then
  docker rm -f ${RANCHER_CONTAINER_NAME}
  kind delete cluster --name ${KIND_CLUSTER_NAME}
  exit 0
fi

# Launch Rancher server
if [[ $(docker ps -f name=${RANCHER_CONTAINER_NAME} -q | wc -l) -ne 0 ]]; then
  echo >&2 "Rancher container already present, delete it before trying again, exiting.."
  exit 1
fi
if docker run -d \
              --restart=unless-stopped \
              --name ${RANCHER_CONTAINER_NAME}  \
              -p ${RANCHER_HTTP_HOST_PORT}:80   \
              -p ${RANCHER_HTTPS_HOST_PORT}:443 \
              rancher/rancher; then
  echo >&2 "Rancher UI will be available at https://${localip}:${RANCHER_HTTPS_HOST_PORT}"
  echo >&2 "It might take few up to 60 seconds for Rancher UI to become available.."
  echo >&2 "While it's coming up, going to start KIND cluster"
fi

# Start KIND cluster
if [[ $(kind get clusters | grep -c ${KIND_CLUSTER_NAME}) -ne 0 ]]; then
  echo >&2 "KIND cluster is already running.."
  echo >&2 -n "Use running KIND? [y/N] "
  read use_running_kind
  case $use_running_kind in
    n|N)
      echo >&2 "exiting.."
      exit 1
    ;;
    y|Y)
      echo >&2 "ok, continuing.."
    ;;
    *)
      echo >&2 "unrecognized option, exiting.."
      exit 1
    ;;
  esac
else
  kind create cluster --name ${KIND_CLUSTER_NAME}
fi

echo >&2
cat >&2 <<EOM
### Next steps ###
- Setup admin credentials in Rancher UI
- Set "Rancher Server URL" to "https://${localip}:${RANCHER_HTTPS_HOST_PORT}" (should already be selected)
  you may change it at any time in "Settings"
- Import KIND cluster to Rancher (via https://${localip}:${RANCHER_HTTPS_HOST_PORT}/g/clusters/add?provider=import)
  (select "Import Existing cluster" when adding a cluster)

> To work around "Unable to connect to the server: x509: certificate signed by unknown authority"
> use "curl --insecure" to get the manigest, piping it's output to
> KUBECONFIG="\$(kind get kubeconfig-path --name=${KIND_CLUSTER_NAME})" kubectl apply -f -

To shut everything down, use "$0 cleanup", or manually with
docker rm -f ${RANCHER_CONTAINER_NAME}; kind delete cluster ${KIND_CLUSTER_NAME}
EOM

# Open Rancher UI in browser
open https://${localip}:${RANCHER_HTTPS_HOST_PORT}