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332 lines
8.9 KiB
332 lines
8.9 KiB
#!/usr/bin/env bash
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# Bash 'Strict Mode'
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# http://redsymbol.net/articles/unofficial-bash-strict-mode
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set -euo pipefail
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IFS=$'\n\t'
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HELM_ROOT="${BASH_SOURCE[0]%/*}/.."
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cd "$HELM_ROOT"
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# Globals ----------------------------------------------------------------------
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KUBE_VERSION=${KUBE_VERSION:-}
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KUBE_PORT=${KUBE_PORT:-8080}
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KUBE_CONTEXT=${KUBE_CONTEXT:-docker}
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KUBECTL=${KUBECTL:-kubectl}
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ENABLE_CLUSTER_DNS=${KUBE_ENABLE_CLUSTER_DNS:-true}
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LOG_LEVEL=${LOG_LEVEL:-2}
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# Helper Functions -------------------------------------------------------------
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# Display error message and exit
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error_exit() {
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echo "error: ${1:-"unknown error"}" 1>&2
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exit 1
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}
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# Checks if a command exists. Returns 1 or 0
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command_exists() {
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hash "${1}" 2>/dev/null
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}
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# Program Functions ------------------------------------------------------------
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# Check host platform and docker host
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verify_prereqs() {
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echo "Verifying Prerequisites...."
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case "$(uname -s)" in
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Darwin)
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host_os=darwin
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;;
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Linux)
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host_os=linux
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;;
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*)
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error_exit "Unsupported host OS. Must be Linux or Mac OS X."
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;;
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esac
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case "$(uname -m)" in
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x86_64*)
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host_arch=amd64
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;;
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i?86_64*)
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host_arch=amd64
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;;
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amd64*)
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host_arch=amd64
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;;
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arm*)
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host_arch=arm
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;;
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i?86*)
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host_arch=x86
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;;
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s390x*)
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host_arch=s390x
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;;
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ppc64le*)
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host_arch=ppc64le
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;;
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*)
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error_exit "Unsupported host arch. Must be x86_64, 386, arm, s390x or ppc64le."
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;;
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esac
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command_exists docker || error_exit "You need docker"
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if ! docker info > /dev/null 2>&1 ; then
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error_exit "Can't connect to 'docker' daemon."
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fi
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$KUBECTL version --client >/dev/null || download_kubectl
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}
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# Get the latest stable release tag
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get_latest_version_number() {
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local -r latest_url="https://storage.googleapis.com/kubernetes-release/release/stable.txt"
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if command_exists wget ; then
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wget -qO- ${latest_url}
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elif command_exists curl ; then
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curl -Ss ${latest_url}
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else
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error_exit "Couldn't find curl or wget. Bailing out."
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fi
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}
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# Detect ip address od docker host
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detect_docker_host_ip() {
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if [ -n "${DOCKER_HOST:-}" ]; then
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awk -F'[/:]' '{print $4}' <<< "$DOCKER_HOST"
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else
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ifconfig docker0 \
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| grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' \
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| grep -Eo '([0-9]*\.){3}[0-9]*' >/dev/null 2>&1 || :
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fi
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}
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# Set KUBE_MASTER_IP from docker host ip. Defaults to localhost
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set_master_ip() {
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local docker_ip
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if [[ -z "${KUBE_MASTER_IP:-}" ]]; then
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docker_ip=$(detect_docker_host_ip)
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if [[ -n "${docker_ip}" ]]; then
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KUBE_MASTER_IP="${docker_ip}"
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else
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KUBE_MASTER_IP=localhost
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fi
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fi
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}
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# Start dockerized kubelet
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start_kubernetes() {
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echo "Starting kubelet"
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# Enable dns
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if [[ "${ENABLE_CLUSTER_DNS}" = true ]]; then
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dns_args="--cluster-dns=10.0.0.1 --cluster-domain=cluster.local"
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else
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# DNS server for real world hostnames.
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dns_args="--cluster-dns=8.8.8.8"
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fi
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local start_time=$(date +%s)
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docker run \
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--name=kubelet \
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--volume=/:/rootfs:ro \
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--volume=/sys:/sys:ro \
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--volume=/var/lib/docker/:/var/lib/docker:rw \
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--volume=/var/lib/kubelet/:/var/lib/kubelet:rw \
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--volume=/var/run:/var/run:rw \
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--net=host \
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--pid=host \
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--privileged=true \
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-d \
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gcr.io/google_containers/hyperkube-amd64:${KUBE_VERSION} \
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/hyperkube kubelet \
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--containerized \
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--hostname-override="127.0.0.1" \
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--api-servers=http://localhost:8080 \
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--config=/etc/kubernetes/manifests \
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--allow-privileged=true \
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${dns_args} \
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--v=${LOG_LEVEL} >/dev/null
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# We expect to have at least 3 running pods - etcd, master and kube-proxy.
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local attempt=1
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while (($($KUBECTL get pods --no-headers 2>/dev/null | grep -c "Running") < 3)); do
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echo -n "."
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sleep $(( attempt++ ))
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done
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echo
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local end_time=$(date +%s)
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echo "Started master components in $((end_time - start_time)) seconds."
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}
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# Open kubernetes master api port.
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setup_firewall() {
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[[ -n "${DOCKER_MACHINE_NAME}" ]] || return
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echo "Adding iptables hackery for docker-machine..."
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local machine_ip
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machine_ip=$(docker-machine ip "$DOCKER_MACHINE_NAME")
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local iptables_rule="PREROUTING -p tcp -d ${machine_ip} --dport ${KUBE_PORT} -j DNAT --to-destination 127.0.0.1:${KUBE_PORT}"
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if ! docker-machine ssh "${DOCKER_MACHINE_NAME}" "sudo /usr/local/sbin/iptables -t nat -C ${iptables_rule}" &> /dev/null; then
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docker-machine ssh "${DOCKER_MACHINE_NAME}" "sudo /usr/local/sbin/iptables -t nat -I ${iptables_rule}"
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fi
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}
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# Create kube-system namespace in kubernetes
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create_kube_system_namespace() {
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echo "Creating kube-system namespace..."
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$KUBECTL create -f ./scripts/cluster/kube-system.yaml >/dev/null
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}
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# Activate skydns in kubernetes and wait for pods to be ready.
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create_kube_dns() {
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[[ "${ENABLE_CLUSTER_DNS}" = true ]] || return
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local start_time=$(date +%s)
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echo "Setting up cluster dns..."
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$KUBECTL create -f ./scripts/cluster/skydns.yaml >/dev/null
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echo "Waiting for cluster DNS to become available..."
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local attempt=1
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until $KUBECTL get pods --no-headers --namespace kube-system --selector=k8s-app=kube-dns 2>/dev/null | grep "Running" &>/dev/null; do
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echo -n "."
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sleep $(( attempt++ ))
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done
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echo
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local end_time=$(date +%s)
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echo "Started DNS in $((end_time - start_time)) seconds."
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}
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# Generate kubeconfig data for the created cluster.
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generate_kubeconfig() {
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local cluster_args=(
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"--server=http://${KUBE_MASTER_IP}:${KUBE_PORT}"
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"--insecure-skip-tls-verify=true"
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)
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$KUBECTL config set-cluster "${KUBE_CONTEXT}" "${cluster_args[@]}" >/dev/null
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$KUBECTL config set-context "${KUBE_CONTEXT}" --cluster="${KUBE_CONTEXT}" >/dev/null
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$KUBECTL config use-context "${KUBE_CONTEXT}" >/dev/null
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echo "Wrote config for kubeconfig using context: '${KUBE_CONTEXT}'"
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}
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# Download kubectl
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download_kubectl() {
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echo "Downloading kubectl binary..."
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kubectl_url="https://storage.googleapis.com/kubernetes-release/release/${KUBE_VERSION}/bin/${host_os}/${host_arch}/kubectl"
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if command_exists wget; then
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wget -O ./bin/kubectl "${kubectl_url}"
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elif command_exists curl; then
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curl -sSOL ./bin/kubectl "${kubectl_url}"
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else
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error_exit "Couldn't find curl or wget. Bailing out."
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fi
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chmod a+x ./bin/kubectl
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KUBECTL=./bin/kubectl
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}
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# Clean volumes that are left by kubelet
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#
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# https://github.com/kubernetes/kubernetes/issues/23197
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# code stolen from https://github.com/huggsboson/docker-compose-kubernetes/blob/SwitchToSharedMount/kube-up.sh
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clean_volumes() {
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if [[ -n "${DOCKER_MACHINE_NAME}" ]]; then
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docker-machine ssh "${DOCKER_MACHINE_NAME}" "mount | grep -o 'on /var/lib/kubelet.* type' | cut -c 4- | rev | cut -c 6- | rev | sort -r | xargs --no-run-if-empty sudo umount"
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docker-machine ssh "${DOCKER_MACHINE_NAME}" "sudo rm -Rf /var/lib/kubelet"
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docker-machine ssh "${DOCKER_MACHINE_NAME}" "sudo mkdir -p /var/lib/kubelet"
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docker-machine ssh "${DOCKER_MACHINE_NAME}" "sudo mount --bind /var/lib/kubelet /var/lib/kubelet"
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docker-machine ssh "${DOCKER_MACHINE_NAME}" "sudo mount --make-shared /var/lib/kubelet"
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else
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mount | grep -o 'on /var/lib/kubelet.* type' | cut -c 4- | rev | cut -c 6- | rev | sort -r | xargs --no-run-if-empty sudo umount
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sudo rm -Rf /var/lib/kubelet
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sudo mkdir -p /var/lib/kubelet
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sudo mount --bind /var/lib/kubelet /var/lib/kubelet
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sudo mount --make-shared /var/lib/kubelet
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fi
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}
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# Helper function to properly remove containers
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delete_container() {
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local container=("$@")
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docker stop "${container[@]}" &>/dev/null || :
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docker wait "${container[@]}" &>/dev/null || :
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docker rm --force --volumes "${container[@]}" &>/dev/null || :
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}
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# Delete master components and resources in kubernetes.
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kube_down() {
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echo "Deleting all resources in kubernetes..."
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$KUBECTL delete replicationcontrollers,services,pods,secrets --all >/dev/null 2>&1 || :
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$KUBECTL delete replicationcontrollers,services,pods,secrets --all --namespace=kube-system >/dev/null 2>&1 || :
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$KUBECTL delete namespace kube-system >/dev/null 2>&1 || :
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echo "Stopping kubelet..."
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delete_container kubelet
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echo "Stopping remaining kubernetes containers..."
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local kube_containers=($(docker ps -aqf "name=k8s_"))
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if [[ "${#kube_containers[@]}" -gt 0 ]]; then
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delete_container "${kube_containers[@]}"
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fi
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}
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# Start a kubernetes cluster in docker.
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kube_up() {
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verify_prereqs
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set_master_ip
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clean_volumes
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setup_firewall
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start_kubernetes
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generate_kubeconfig
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create_kube_system_namespace
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create_kube_dns
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$KUBECTL cluster-info
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}
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KUBE_VERSION=${KUBE_VERSION:-$(get_latest_version_number)}
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# Main -------------------------------------------------------------------------
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main() {
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case "$1" in
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up|start)
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kube_up
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;;
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down|stop)
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kube_down
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;;
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restart)
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kube_down
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kube_up
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;;
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*)
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echo "Usage: $0 {up|down|restart}"
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;;
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esac
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}
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main "${@:-}"
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