node-build.sh

#!/bin/bash

set -Eeuxo pipefail

# k8s repo version to build the kind node image from.
K8S_REPO_VERSION="${K8S_REPO_VERSION:-master}"
# Container image repo name to be used for the kind node image.
KIND_NODE_IMAGE_REPO="${KIND_NODE_IMAGE_REPO:-kindest/node}"
# Tag of the kind node image. 
KIND_NODE_IMAGE_TAG="${KIND_NODE_IMAGE_TAG:-test}"
# KinD git repo to build custom version of kind.
KIND_GIT_REPO="${KIND_GIT_REPO:-github.com/kubernetes-sigs/kind}"
# KinD git repo branch to build custom version of kind.
KIND_GIT_REPO_BRANCH="${KIND_GIT_REPO_BRANCH:-master}"


build_kind() {
    KIND_IMPORT_PATH=sigs.k8s.io/kind
    KIND_GIT_REPO_DIR=$GOPATH/src/$KIND_IMPORT_PATH

    echo "Cloning kind repo..."
    git clone --branch "$KIND_GIT_REPO_BRANCH" https://"$KIND_GIT_REPO" "$KIND_GIT_REPO_DIR" --depth 1

    echo "Building kind..."
    pushd "$KIND_GIT_REPO_DIR"
        go mod vendor
        go install -v $KIND_IMPORT_PATH
    popd

    echo "Checking the installed kind..."
    kind
}

build_kind_node() {
    echo "Building kind base image..."
    kind build base-image
    echo "Building kind node image from latest k/k $K8S_REPO_VERSION..."
    kind build node-image --base-image kindest/base:latest --image "$KIND_NODE_IMAGE_REPO:$KIND_NODE_IMAGE_TAG"
}

# Run a kind cluster and check if it's ready.
run_kind() {
    sudo cp "$GOPATH/src/k8s.io/kubernetes/_output/dockerized/bin/linux/amd64/kubectl" /usr/local/bin/

    echo "Create Kubernetes cluster with kind..."
    kind create cluster --image "$KIND_NODE_IMAGE_REPO:$KIND_NODE_IMAGE_TAG"
    export KUBECONFIG="${HOME}/.kube/config"

    echo "Get cluster info..."
    kubectl cluster-info
    kubectl version
    echo

    echo "Wait for kubernetes to be ready"
    JSONPATH='{range .items[*]}{@.metadata.name}:{range @.status.conditions[*]}{@.type}={@.status};{end}{end}'; until kubectl get nodes -o jsonpath="$JSONPATH" 2>&1 | grep -q "Ready=True"; do sleep 1; done
    echo

    kubectl get all --all-namespaces

    # Delete kind cluster.
    kind delete cluster
}

main() {
    build_kind
    build_kind_node
    run_kind
}

main