#!/usr/bin/env bash # Copyright 2015 The Kubernetes Authors. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # This script will download latest version of kubectl command line tool and will # bring up a local Kubernetes cluster with a single node. set -o errexit set -o nounset set -o pipefail KUBE_HOST=${KUBE_HOST:-localhost} KUBELET_KUBECONFIG=${KUBELET_KUBECONFIG:-"/var/run/kubernetes/kubelet.kubeconfig"} declare -r RED="\033[0;31m" declare -r GREEN="\033[0;32m" declare -r YELLOW="\033[0;33m" function echo_green { echo -e "${GREEN}$1"; tput sgr0 } function echo_red { echo -e "${RED}$1"; tput sgr0 } function echo_yellow { echo -e "${YELLOW}$1"; tput sgr0 } function run { # For a moment we need to change bash options to capture message if a command fails. set +o errexit output=$($1 2>&1) exit_code=$? set -o errexit if [ $exit_code -eq 0 ]; then echo_green "SUCCESS" else echo_red "FAILED" echo $output >&2 exit 1 fi } # Creates a kubeconfig file for the kubelet. # Args: destination file path function create-kubelet-kubeconfig() { local destination="${2}" if [[ -z "${destination}" ]]; then echo "Must provide destination path to create Kubelet kubeconfig file!" exit 1 fi echo "Creating Kubelet kubeconfig file" local dest_dir="$(dirname "${destination}")" mkdir -p "${dest_dir}" &>/dev/null || sudo mkdir -p "${dest_dir}" sudo=$(test -w "${dest_dir}" || echo "sudo -E") cat < /dev/null apiVersion: v1 kind: Config clusters: - cluster: server: http://localhost:8080 name: local contexts: - context: cluster: local name: local current-context: local EOF } function create_cluster { echo "Creating a local cluster:" echo -e -n "\tStarting kubelet..." create-kubelet-kubeconfig "${KUBELET_KUBECONFIG}" run "docker run \ --volume=/:/rootfs:ro \ --volume=/sys:/sys:ro \ --volume=/var/lib/docker/:/var/lib/docker:rw \ --volume=/var/lib/kubelet/:/var/lib/kubelet:rw \ --volume=/var/run:/var/run:rw \ --volume=/run/xtables.lock:/run/xtables.lock:rw \ --net=host \ --pid=host \ --privileged=true \ -d \ k8s.gcr.io/hyperkube-${arch}:${release} \ /hyperkube kubelet \ --containerized \ --hostname-override="127.0.0.1" \ --address="0.0.0.0" \ --kubeconfig=${KUBELET_KUBECONFIG}/kubelet.kubeconfig \ --pod-manifest-path=/etc/kubernetes/manifests \ --allow-privileged=true \ --cluster-dns=10.0.0.10 \ --cluster-domain=cluster.local \ --v=2" echo -e -n "\tWaiting for master components to start..." while true; do local running_count=$(kubectl -s=http://${KUBE_HOST}:8080 get pods --no-headers --namespace=kube-system 2>/dev/null | grep "Running" | wc -l) # We expect to have 3 running pods - etcd, master and kube-proxy. if [ "$running_count" -ge 3 ]; then break fi echo -n "." sleep 1 done echo_green "SUCCESS" echo_green "Cluster created!" echo "" kubectl -s http://${KUBE_HOST}:8080 clusterinfo } function get_latest_version_number { local -r latest_url="https://storage.googleapis.com/kubernetes-release/release/stable.txt" if [[ $(which wget) ]]; then wget -qO- ${latest_url} elif [[ $(which curl) ]]; then curl -Ss ${latest_url} else echo_red "Couldn't find curl or wget. Bailing out." exit 4 fi } latest_release=$(get_latest_version_number) release=${KUBE_VERSION:-${latest_release}} uname=$(uname) if [[ "${uname}" == "Darwin" ]]; then platform="darwin" elif [[ "${uname}" == "Linux" ]]; then platform="linux" else echo_red "Unknown, unsupported platform: (${uname})." echo_red "Supported platforms: Linux, Darwin." echo_red "Bailing out." exit 2 fi machine=$(uname -m) if [[ "${machine}" == "x86_64" ]]; then arch="amd64" elif [[ "${machine}" == "i686" ]]; then arch="386" elif [[ "${machine}" == "arm*" ]]; then arch="arm" elif [[ "${machine}" == "s390x*" ]]; then arch="s390x" else echo_red "Unknown, unsupported architecture (${machine})." echo_red "Supported architectures x86_64, i686, arm, s390x." echo_red "Bailing out." exit 3 fi kubectl_url="https://storage.googleapis.com/kubernetes-release/release/${release}/bin/${platform}/${arch}/kubectl" if [[ $(ls . | grep ^kubectl$ | wc -l) -lt 1 ]]; then echo -n "Downloading kubectl binary..." if [[ $(which wget) ]]; then run "wget ${kubectl_url}" elif [[ $(which curl) ]]; then run "curl -OL ${kubectl_url}" else echo_red "Couldn't find curl or wget. Bailing out." exit 1 fi chmod a+x kubectl echo "" else # TODO: We should detect version of kubectl binary if it too old # download newer version. echo "Detected existing kubectl binary. Skipping download." fi create_cluster echo "" echo "" echo "To list the nodes in your cluster run" echo_yellow "\tkubectl -s=http://${KUBE_HOST}:8080 get nodes" echo "" echo "To run your first pod run" echo_yellow "\tkubectl -s http://${KUBE_HOST}:8080 run nginx --image=nginx --port=80"