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util.sh
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util.sh
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#!/bin/bash
# Copyright 2014 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.
# A library of helper functions and constant for the local config.
# Use the config file specified in $KUBE_CONFIG_FILE, or default to
# config-default.sh.
KUBE_ROOT=$(dirname "${BASH_SOURCE}")/../..
source "${KUBE_ROOT}/cluster/gce/${KUBE_CONFIG_FILE-"config-default.sh"}"
source "${KUBE_ROOT}/cluster/common.sh"
source "${KUBE_ROOT}/cluster/lib/util.sh"
if [[ "${NODE_OS_DISTRIBUTION}" == "debian" || "${NODE_OS_DISTRIBUTION}" == "coreos" || "${NODE_OS_DISTRIBUTION}" == "trusty" || "${NODE_OS_DISTRIBUTION}" == "gci" ]]; then
source "${KUBE_ROOT}/cluster/gce/${NODE_OS_DISTRIBUTION}/node-helper.sh"
else
echo "Cannot operate on cluster using node os distro: ${NODE_OS_DISTRIBUTION}" >&2
exit 1
fi
if [[ "${MASTER_OS_DISTRIBUTION}" == "debian" || "${MASTER_OS_DISTRIBUTION}" == "coreos" || "${MASTER_OS_DISTRIBUTION}" == "trusty" || "${MASTER_OS_DISTRIBUTION}" == "gci" ]]; then
source "${KUBE_ROOT}/cluster/gce/${MASTER_OS_DISTRIBUTION}/master-helper.sh"
else
echo "Cannot operate on cluster using master os distro: ${MASTER_OS_DISTRIBUTION}" >&2
exit 1
fi
if [[ "${MASTER_OS_DISTRIBUTION}" == "gci" ]]; then
# If the master image is not set, we use the latest GCI image.
# Otherwise, we respect whatever is set by the user.
MASTER_IMAGE=${KUBE_GCE_MASTER_IMAGE:-${GCI_VERSION}}
MASTER_IMAGE_PROJECT=${KUBE_GCE_MASTER_PROJECT:-google-containers}
elif [[ "${MASTER_OS_DISTRIBUTION}" == "debian" ]]; then
MASTER_IMAGE=${KUBE_GCE_MASTER_IMAGE:-${CVM_VERSION}}
MASTER_IMAGE_PROJECT=${KUBE_GCE_MASTER_PROJECT:-google-containers}
fi
# Sets node image based on the specified os distro. Currently this function only
# supports gci and debian.
function set-node-image() {
if [[ "${NODE_OS_DISTRIBUTION}" == "gci" ]]; then
# If the node image is not set, we use the latest GCI image.
# Otherwise, we respect whatever is set by the user.
NODE_IMAGE=${KUBE_GCE_NODE_IMAGE:-${GCI_VERSION}}
NODE_IMAGE_PROJECT=${KUBE_GCE_NODE_PROJECT:-google-containers}
elif [[ "${NODE_OS_DISTRIBUTION}" == "debian" ]]; then
NODE_IMAGE=${KUBE_GCE_NODE_IMAGE:-${CVM_VERSION}}
NODE_IMAGE_PROJECT=${KUBE_GCE_NODE_PROJECT:-google-containers}
fi
}
set-node-image
# Verfiy cluster autoscaler configuration.
if [[ "${ENABLE_CLUSTER_AUTOSCALER}" == "true" ]]; then
if [ -z $AUTOSCALER_MIN_NODES ]; then
echo "AUTOSCALER_MIN_NODES not set."
exit 1
fi
if [ -z $AUTOSCALER_MAX_NODES ]; then
echo "AUTOSCALER_MAX_NODES not set."
exit 1
fi
fi
NODE_INSTANCE_PREFIX="${INSTANCE_PREFIX}-minion"
NODE_TAGS="${NODE_TAG}"
ALLOCATE_NODE_CIDRS=true
KUBE_PROMPT_FOR_UPDATE=y
KUBE_SKIP_UPDATE=${KUBE_SKIP_UPDATE-"n"}
# How long (in seconds) to wait for cluster initialization.
KUBE_CLUSTER_INITIALIZATION_TIMEOUT=${KUBE_CLUSTER_INITIALIZATION_TIMEOUT:-300}
function join_csv() {
local IFS=','; echo "$*";
}
# This function returns the first string before the comma
function split_csv() {
echo "$*" | cut -d',' -f1
}
# Verify prereqs
function verify-prereqs() {
local cmd
for cmd in gcloud gsutil; do
if ! which "${cmd}" >/dev/null; then
local resp
if [[ "${KUBE_PROMPT_FOR_UPDATE}" == "y" ]]; then
echo "Can't find ${cmd} in PATH. Do you wish to install the Google Cloud SDK? [Y/n]"
read resp
else
resp="y"
fi
if [[ "${resp}" != "n" && "${resp}" != "N" ]]; then
curl https://sdk.cloud.google.com | bash
fi
if ! which "${cmd}" >/dev/null; then
echo "Can't find ${cmd} in PATH, please fix and retry. The Google Cloud " >&2
echo "SDK can be downloaded from https://cloud.google.com/sdk/." >&2
exit 1
fi
fi
done
if [[ "${KUBE_SKIP_UPDATE}" == "y" ]]; then
return
fi
# update and install components as needed
if [[ "${KUBE_PROMPT_FOR_UPDATE}" != "y" ]]; then
gcloud_prompt="-q"
fi
local sudo_prefix=""
if [ ! -w $(dirname `which gcloud`) ]; then
sudo_prefix="sudo"
fi
${sudo_prefix} gcloud ${gcloud_prompt:-} components install alpha || true
${sudo_prefix} gcloud ${gcloud_prompt:-} components install beta || true
${sudo_prefix} gcloud ${gcloud_prompt:-} components update || true
}
# Create a temp dir that'll be deleted at the end of this bash session.
#
# Vars set:
# KUBE_TEMP
function ensure-temp-dir() {
if [[ -z ${KUBE_TEMP-} ]]; then
KUBE_TEMP=$(mktemp -d -t kubernetes.XXXXXX)
trap 'rm -rf "${KUBE_TEMP}"' EXIT
fi
}
# Use the gcloud defaults to find the project. If it is already set in the
# environment then go with that.
#
# Vars set:
# PROJECT
# PROJECT_REPORTED
function detect-project() {
if [[ -z "${PROJECT-}" ]]; then
PROJECT=$(gcloud config list project --format 'value(core.project)')
fi
if [[ -z "${PROJECT-}" ]]; then
echo "Could not detect Google Cloud Platform project. Set the default project using " >&2
echo "'gcloud config set project <PROJECT>'" >&2
exit 1
fi
if [[ -z "${PROJECT_REPORTED-}" ]]; then
echo "Project: ${PROJECT}" >&2
echo "Zone: ${ZONE}" >&2
PROJECT_REPORTED=true
fi
}
# Copy a release tar and its accompanying hash.
function copy-to-staging() {
local -r staging_path=$1
local -r gs_url=$2
local -r tar=$3
local -r hash=$4
echo "${hash}" > "${tar}.sha1"
gsutil -m -q -h "Cache-Control:private, max-age=0" cp "${tar}" "${tar}.sha1" "${staging_path}"
gsutil -m acl ch -g all:R "${gs_url}" "${gs_url}.sha1" >/dev/null 2>&1
echo "+++ $(basename ${tar}) uploaded (sha1 = ${hash})"
}
# Given the cluster zone, return the list of regional GCS release
# bucket suffixes for the release in preference order. GCS doesn't
# give us an API for this, so we hardcode it.
#
# Assumed vars:
# RELEASE_REGION_FALLBACK
# REGIONAL_KUBE_ADDONS
# ZONE
# Vars set:
# PREFERRED_REGION
# KUBE_ADDON_REGISTRY
function set-preferred-region() {
case ${ZONE} in
asia-*)
PREFERRED_REGION=("asia" "us" "eu")
;;
europe-*)
PREFERRED_REGION=("eu" "us" "asia")
;;
*)
PREFERRED_REGION=("us" "eu" "asia")
;;
esac
local -r preferred="${PREFERRED_REGION[0]}"
if [[ "${RELEASE_REGION_FALLBACK}" != "true" ]]; then
PREFERRED_REGION=( "${preferred}" )
fi
# If we're using regional GCR, and we're outside the US, go to the
# regional registry. The gcr.io/google_containers registry is
# appropriate for US (for now).
if [[ "${REGIONAL_KUBE_ADDONS}" == "true" ]] && [[ "${preferred}" != "us" ]]; then
KUBE_ADDON_REGISTRY="${preferred}.gcr.io/google_containers"
else
KUBE_ADDON_REGISTRY="gcr.io/google_containers"
fi
if [[ "${ENABLE_DOCKER_REGISTRY_CACHE:-}" == "true" ]]; then
DOCKER_REGISTRY_MIRROR_URL="https://${preferred}-mirror.gcr.io"
fi
}
# Take the local tar files and upload them to Google Storage. They will then be
# downloaded by the master as part of the start up script for the master.
#
# Assumed vars:
# PROJECT
# SERVER_BINARY_TAR
# SALT_TAR
# KUBE_MANIFESTS_TAR
# ZONE
# Vars set:
# SERVER_BINARY_TAR_URL
# SERVER_BINARY_TAR_HASH
# SALT_TAR_URL
# SALT_TAR_HASH
# KUBE_MANIFESTS_TAR_URL
# KUBE_MANIFESTS_TAR_HASH
function upload-server-tars() {
SERVER_BINARY_TAR_URL=
SERVER_BINARY_TAR_HASH=
SALT_TAR_URL=
SALT_TAR_HASH=
KUBE_MANIFESTS_TAR_URL=
KUBE_MANIFESTS_TAR_HASH=
local project_hash
if which md5 > /dev/null 2>&1; then
project_hash=$(md5 -q -s "$PROJECT")
else
project_hash=$(echo -n "$PROJECT" | md5sum | awk '{ print $1 }')
fi
# This requires 1 million projects before the probability of collision is 50%
# that's probably good enough for now :P
project_hash=${project_hash:0:10}
set-preferred-region
SERVER_BINARY_TAR_HASH=$(sha1sum-file "${SERVER_BINARY_TAR}")
SALT_TAR_HASH=$(sha1sum-file "${SALT_TAR}")
if [[ -n "${KUBE_MANIFESTS_TAR:-}" ]]; then
KUBE_MANIFESTS_TAR_HASH=$(sha1sum-file "${KUBE_MANIFESTS_TAR}")
fi
local server_binary_tar_urls=()
local salt_tar_urls=()
local kube_manifest_tar_urls=()
for region in "${PREFERRED_REGION[@]}"; do
suffix="-${region}"
if [[ "${suffix}" == "-us" ]]; then
suffix=""
fi
local staging_bucket="gs://kubernetes-staging-${project_hash}${suffix}"
# Ensure the buckets are created
if ! gsutil ls "${staging_bucket}" ; then
echo "Creating ${staging_bucket}"
gsutil mb -l "${region}" "${staging_bucket}"
fi
local staging_path="${staging_bucket}/${INSTANCE_PREFIX}-devel"
echo "+++ Staging server tars to Google Storage: ${staging_path}"
local server_binary_gs_url="${staging_path}/${SERVER_BINARY_TAR##*/}"
local salt_gs_url="${staging_path}/${SALT_TAR##*/}"
copy-to-staging "${staging_path}" "${server_binary_gs_url}" "${SERVER_BINARY_TAR}" "${SERVER_BINARY_TAR_HASH}"
copy-to-staging "${staging_path}" "${salt_gs_url}" "${SALT_TAR}" "${SALT_TAR_HASH}"
# Convert from gs:// URL to an https:// URL
server_binary_tar_urls+=("${server_binary_gs_url/gs:\/\//https://storage.googleapis.com/}")
salt_tar_urls+=("${salt_gs_url/gs:\/\//https://storage.googleapis.com/}")
if [[ -n "${KUBE_MANIFESTS_TAR:-}" ]]; then
local kube_manifests_gs_url="${staging_path}/${KUBE_MANIFESTS_TAR##*/}"
copy-to-staging "${staging_path}" "${kube_manifests_gs_url}" "${KUBE_MANIFESTS_TAR}" "${KUBE_MANIFESTS_TAR_HASH}"
# Convert from gs:// URL to an https:// URL
kube_manifests_tar_urls+=("${kube_manifests_gs_url/gs:\/\//https://storage.googleapis.com/}")
fi
done
SERVER_BINARY_TAR_URL=$(join_csv "${server_binary_tar_urls[@]}")
SALT_TAR_URL=$(join_csv "${salt_tar_urls[@]}")
if [[ -n "${KUBE_MANIFESTS_TAR:-}" ]]; then
KUBE_MANIFESTS_TAR_URL=$(join_csv "${kube_manifests_tar_urls[@]}")
fi
}
# Detect minions created in the minion group
#
# Assumed vars:
# NODE_INSTANCE_PREFIX
# Vars set:
# NODE_NAMES
# INSTANCE_GROUPS
function detect-node-names() {
detect-project
INSTANCE_GROUPS=()
INSTANCE_GROUPS+=($(gcloud compute instance-groups managed list \
--zones "${ZONE}" --project "${PROJECT}" \
--regexp "${NODE_INSTANCE_PREFIX}-.+" \
--format='value(instanceGroup)' || true))
NODE_NAMES=()
if [[ -n "${INSTANCE_GROUPS[@]:-}" ]]; then
for group in "${INSTANCE_GROUPS[@]}"; do
NODE_NAMES+=($(gcloud compute instance-groups managed list-instances \
"${group}" --zone "${ZONE}" --project "${PROJECT}" \
--format='value(instance)'))
done
fi
echo "INSTANCE_GROUPS=${INSTANCE_GROUPS[*]:-}" >&2
echo "NODE_NAMES=${NODE_NAMES[*]:-}" >&2
}
# Detect the information about the minions
#
# Assumed vars:
# ZONE
# Vars set:
# NODE_NAMES
# KUBE_NODE_IP_ADDRESSES (array)
function detect-nodes() {
detect-project
detect-node-names
KUBE_NODE_IP_ADDRESSES=()
for (( i=0; i<${#NODE_NAMES[@]}; i++)); do
local node_ip=$(gcloud compute instances describe --project "${PROJECT}" --zone "${ZONE}" \
"${NODE_NAMES[$i]}" --format='value(networkInterfaces[0].accessConfigs[0].natIP)')
if [[ -z "${node_ip-}" ]] ; then
echo "Did not find ${NODE_NAMES[$i]}" >&2
else
echo "Found ${NODE_NAMES[$i]} at ${node_ip}"
KUBE_NODE_IP_ADDRESSES+=("${node_ip}")
fi
done
if [[ -z "${KUBE_NODE_IP_ADDRESSES-}" ]]; then
echo "Could not detect Kubernetes minion nodes. Make sure you've launched a cluster with 'kube-up.sh'" >&2
exit 1
fi
}
# Detect the IP for the master
#
# Assumed vars:
# MASTER_NAME
# ZONE
# REGION
# Vars set:
# KUBE_MASTER
# KUBE_MASTER_IP
function detect-master() {
detect-project
KUBE_MASTER=${MASTER_NAME}
echo "Trying to find master named '${MASTER_NAME}'" >&2
if [[ -z "${KUBE_MASTER_IP-}" ]]; then
local master_address_name="${MASTER_NAME}-ip"
echo "Looking for address '${master_address_name}'" >&2
KUBE_MASTER_IP=$(gcloud compute addresses describe "${master_address_name}" \
--project "${PROJECT}" --region "${REGION}" -q --format='value(address)')
fi
if [[ -z "${KUBE_MASTER_IP-}" ]]; then
echo "Could not detect Kubernetes master node. Make sure you've launched a cluster with 'kube-up.sh'" >&2
exit 1
fi
echo "Using master: $KUBE_MASTER (external IP: $KUBE_MASTER_IP)" >&2
}
# Reads kube-env metadata from master
#
# Assumed vars:
# KUBE_MASTER
# PROJECT
# ZONE
function get-master-env() {
# TODO(zmerlynn): Make this more reliable with retries.
gcloud compute --project ${PROJECT} ssh --zone ${ZONE} ${KUBE_MASTER} --command \
"curl --fail --silent -H 'Metadata-Flavor: Google' \
'http://metadata/computeMetadata/v1/instance/attributes/kube-env'" 2>/dev/null
}
# Robustly try to create a static ip.
# $1: The name of the ip to create
# $2: The name of the region to create the ip in.
function create-static-ip() {
detect-project
local attempt=0
local REGION="$2"
while true; do
if gcloud compute addresses create "$1" \
--project "${PROJECT}" \
--region "${REGION}" -q > /dev/null; then
# successful operation
break
fi
if cloud compute addresses describe "$1" \
--project "${PROJECT}" \
--region "${REGION}" >/dev/null 2>&1; then
# it exists - postcondition satisfied
break
fi
if (( attempt > 4 )); then
echo -e "${color_red}Failed to create static ip $1 ${color_norm}" >&2
exit 2
fi
attempt=$(($attempt+1))
echo -e "${color_yellow}Attempt $attempt failed to create static ip $1. Retrying.${color_norm}" >&2
sleep $(($attempt * 5))
done
}
# Robustly try to create a firewall rule.
# $1: The name of firewall rule.
# $2: IP ranges.
# $3: Target tags for this firewall rule.
function create-firewall-rule() {
detect-project
local attempt=0
while true; do
if ! gcloud compute firewall-rules create "$1" \
--project "${PROJECT}" \
--network "${NETWORK}" \
--source-ranges "$2" \
--target-tags "$3" \
--allow tcp,udp,icmp,esp,ah,sctp; then
if (( attempt > 4 )); then
echo -e "${color_red}Failed to create firewall rule $1 ${color_norm}" >&2
exit 2
fi
echo -e "${color_yellow}Attempt $(($attempt+1)) failed to create firewall rule $1. Retrying.${color_norm}" >&2
attempt=$(($attempt+1))
sleep $(($attempt * 5))
else
break
fi
done
}
# $1: version (required)
function get-template-name-from-version() {
# trim template name to pass gce name validation
echo "${NODE_INSTANCE_PREFIX}-template-${1}" | cut -c 1-63 | sed 's/[\.\+]/-/g;s/-*$//g'
}
# Robustly try to create an instance template.
# $1: The name of the instance template.
# $2: The scopes flag.
# $3 and others: Metadata entries (must all be from a file).
function create-node-template() {
detect-project
local template_name="$1"
# First, ensure the template doesn't exist.
# TODO(zmerlynn): To make this really robust, we need to parse the output and
# add retries. Just relying on a non-zero exit code doesn't
# distinguish an ephemeral failed call from a "not-exists".
if gcloud compute instance-templates describe "$template_name" --project "${PROJECT}" &>/dev/null; then
echo "Instance template ${1} already exists; deleting." >&2
if ! gcloud compute instance-templates delete "$template_name" --project "${PROJECT}" &>/dev/null; then
echo -e "${color_yellow}Failed to delete existing instance template${color_norm}" >&2
exit 2
fi
fi
local attempt=1
local preemptible_minions=""
if [[ "${PREEMPTIBLE_NODE}" == "true" ]]; then
preemptible_minions="--preemptible --maintenance-policy TERMINATE"
fi
while true; do
echo "Attempt ${attempt} to create ${1}" >&2
if ! gcloud compute instance-templates create "$template_name" \
--project "${PROJECT}" \
--machine-type "${NODE_SIZE}" \
--boot-disk-type "${NODE_DISK_TYPE}" \
--boot-disk-size "${NODE_DISK_SIZE}" \
--image-project="${NODE_IMAGE_PROJECT}" \
--image "${NODE_IMAGE}" \
--tags "${NODE_TAG}" \
--network "${NETWORK}" \
${preemptible_minions} \
$2 \
--can-ip-forward \
--metadata-from-file $(echo ${@:3} | tr ' ' ',') >&2; then
if (( attempt > 5 )); then
echo -e "${color_red}Failed to create instance template $template_name ${color_norm}" >&2
exit 2
fi
echo -e "${color_yellow}Attempt ${attempt} failed to create instance template $template_name. Retrying.${color_norm}" >&2
attempt=$(($attempt+1))
sleep $(($attempt * 5))
# In case the previous attempt failed with something like a
# Backend Error and left the entry laying around, delete it
# before we try again.
gcloud compute instance-templates delete "$template_name" --project "${PROJECT}" &>/dev/null || true
else
break
fi
done
}
# Robustly try to add metadata on an instance.
# $1: The name of the instance.
# $2...$n: The metadata key=value pairs to add.
function add-instance-metadata() {
local -r instance=$1
shift 1
local -r kvs=( "$@" )
detect-project
local attempt=0
while true; do
if ! gcloud compute instances add-metadata "${instance}" \
--project "${PROJECT}" \
--zone "${ZONE}" \
--metadata "${kvs[@]}"; then
if (( attempt > 5 )); then
echo -e "${color_red}Failed to add instance metadata in ${instance} ${color_norm}" >&2
exit 2
fi
echo -e "${color_yellow}Attempt $(($attempt+1)) failed to add metadata in ${instance}. Retrying.${color_norm}" >&2
attempt=$(($attempt+1))
sleep $((5 * $attempt))
else
break
fi
done
}
# Robustly try to add metadata on an instance, from a file.
# $1: The name of the instance.
# $2...$n: The metadata key=file pairs to add.
function add-instance-metadata-from-file() {
local -r instance=$1
shift 1
local -r kvs=( "$@" )
detect-project
local attempt=0
while true; do
echo "${kvs[@]}"
if ! gcloud compute instances add-metadata "${instance}" \
--project "${PROJECT}" \
--zone "${ZONE}" \
--metadata-from-file "$(join_csv ${kvs[@]})"; then
if (( attempt > 5 )); then
echo -e "${color_red}Failed to add instance metadata in ${instance} ${color_norm}" >&2
exit 2
fi
echo -e "${color_yellow}Attempt $(($attempt+1)) failed to add metadata in ${instance}. Retrying.${color_norm}" >&2
attempt=$(($attempt+1))
sleep $(($attempt * 5))
else
break
fi
done
}
# Instantiate a kubernetes cluster
#
# Assumed vars
# KUBE_ROOT
# <Various vars set in config file>
function kube-up() {
ensure-temp-dir
detect-project
load-or-gen-kube-basicauth
load-or-gen-kube-bearertoken
# Make sure we have the tar files staged on Google Storage
find-release-tars
upload-server-tars
# ensure that environmental variables specifying number of migs to create
set_num_migs
if [[ ${KUBE_USE_EXISTING_MASTER:-} == "true" ]]; then
parse-master-env
create-nodes
elif [[ ${KUBE_EXPERIMENTAL_REPLICATE_EXISTING_MASTER:-} == "true" ]]; then
if [[ "${MASTER_OS_DISTRIBUTION}" != "gci" && "${MASTER_OS_DISTRIBUTION}" != "debian" ]]; then
echo "Master replication supported only for gci and debian"
return 1
fi
create-loadbalancer
# If replication of master fails, we need to ensure that the replica is removed from etcd clusters.
if ! replicate-master; then
remove-replica-from-etcd 2379 || true
remove-replica-from-etcd 4002 || true
fi
else
check-existing
create-network
write-cluster-name
create-autoscaler-config
create-master
create-nodes-firewall
create-nodes-template
create-nodes
check-cluster
fi
}
function check-existing() {
local running_in_terminal=false
# May be false if tty is not allocated (for example with ssh -T).
if [ -t 1 ]; then
running_in_terminal=true
fi
if [[ ${running_in_terminal} == "true" || ${KUBE_UP_AUTOMATIC_CLEANUP} == "true" ]]; then
if ! check-resources; then
local run_kube_down="n"
echo "${KUBE_RESOURCE_FOUND} found." >&2
# Get user input only if running in terminal.
if [[ ${running_in_terminal} == "true" && ${KUBE_UP_AUTOMATIC_CLEANUP} == "false" ]]; then
read -p "Would you like to shut down the old cluster (call kube-down)? [y/N] " run_kube_down
fi
if [[ ${run_kube_down} == "y" || ${run_kube_down} == "Y" || ${KUBE_UP_AUTOMATIC_CLEANUP} == "true" ]]; then
echo "... calling kube-down" >&2
kube-down
fi
fi
fi
}
function create-network() {
if ! gcloud compute networks --project "${PROJECT}" describe "${NETWORK}" &>/dev/null; then
echo "Creating new network: ${NETWORK}"
# The network needs to be created synchronously or we have a race. The
# firewalls can be added concurrent with instance creation.
gcloud compute networks create --project "${PROJECT}" "${NETWORK}" --range "10.240.0.0/16"
fi
if ! gcloud compute firewall-rules --project "${PROJECT}" describe "${NETWORK}-default-internal" &>/dev/null; then
gcloud compute firewall-rules create "${NETWORK}-default-internal" \
--project "${PROJECT}" \
--network "${NETWORK}" \
--source-ranges "10.0.0.0/8" \
--allow "tcp:1-65535,udp:1-65535,icmp" &
fi
if ! gcloud compute firewall-rules describe --project "${PROJECT}" "${NETWORK}-default-ssh" &>/dev/null; then
gcloud compute firewall-rules create "${NETWORK}-default-ssh" \
--project "${PROJECT}" \
--network "${NETWORK}" \
--source-ranges "0.0.0.0/0" \
--allow "tcp:22" &
fi
}
# Assumes:
# NUM_NODES
# Sets:
# MASTER_ROOT_DISK_SIZE
function get-master-root-disk-size() {
if [[ "${NUM_NODES}" -le "1000" ]]; then
export MASTER_ROOT_DISK_SIZE="20"
else
export MASTER_ROOT_DISK_SIZE="50"
fi
}
function create-master() {
echo "Starting master and configuring firewalls"
gcloud compute firewall-rules create "${MASTER_NAME}-https" \
--project "${PROJECT}" \
--network "${NETWORK}" \
--target-tags "${MASTER_TAG}" \
--allow tcp:443 &
# We have to make sure the disk is created before creating the master VM, so
# run this in the foreground.
gcloud compute disks create "${MASTER_NAME}-pd" \
--project "${PROJECT}" \
--zone "${ZONE}" \
--type "${MASTER_DISK_TYPE}" \
--size "${MASTER_DISK_SIZE}"
# Create disk for cluster registry if enabled
if [[ "${ENABLE_CLUSTER_REGISTRY}" == true && -n "${CLUSTER_REGISTRY_DISK}" ]]; then
gcloud compute disks create "${CLUSTER_REGISTRY_DISK}" \
--project "${PROJECT}" \
--zone "${ZONE}" \
--type "${CLUSTER_REGISTRY_DISK_TYPE_GCE}" \
--size "${CLUSTER_REGISTRY_DISK_SIZE}" &
fi
# Generate a bearer token for this cluster. We push this separately
# from the other cluster variables so that the client (this
# computer) can forget it later. This should disappear with
# http://issue.k8s.io/3168
KUBELET_TOKEN=$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64 | tr -d "=+/" | dd bs=32 count=1 2>/dev/null)
KUBE_PROXY_TOKEN=$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64 | tr -d "=+/" | dd bs=32 count=1 2>/dev/null)
# Reserve the master's IP so that it can later be transferred to another VM
# without disrupting the kubelets.
create-static-ip "${MASTER_NAME}-ip" "${REGION}"
MASTER_RESERVED_IP=$(gcloud compute addresses describe "${MASTER_NAME}-ip" \
--project "${PROJECT}" --region "${REGION}" -q --format='value(address)')
create-certs "${MASTER_RESERVED_IP}"
# Sets MASTER_ROOT_DISK_SIZE that is used by create-master-instance
get-master-root-disk-size
create-master-instance "${MASTER_RESERVED_IP}" &
}
# Adds master replica to etcd cluster.
#
# Assumed vars:
# REPLICA_NAME
# PROJECT
# EXISTING_MASTER_NAME
# EXISTING_MASTER_ZONE
#
# $1: etcd client port
# $2: etcd internal port
# returns the result of ssh command which adds replica
function add-replica-to-etcd() {
local -r client_port="${1}"
local -r internal_port="${2}"
gcloud compute ssh "${EXISTING_MASTER_NAME}" \
--project "${PROJECT}" \
--zone "${EXISTING_MASTER_ZONE}" \
--command \
"curl localhost:${client_port}/v2/members -XPOST -H \"Content-Type: application/json\" -d '{\"peerURLs\":[\"http://${REPLICA_NAME}:${internal_port}\"]}'"
return $?
}
# Sets EXISTING_MASTER_NAME and EXISTING_MASTER_ZONE variables.
#
# Assumed vars:
# PROJECT
#
# NOTE: Must be in sync with get-replica-name-regexp
function set-existing-master() {
local existing_master=$(gcloud compute instances list \
--project "${PROJECT}" \
--regexp "$(get-replica-name-regexp)" \
--format "value(name,zone)" | head -n1)
EXISTING_MASTER_NAME="$(echo "${existing_master}" | cut -f1)"
EXISTING_MASTER_ZONE="$(echo "${existing_master}" | cut -f2)"
}
function replicate-master() {
set-replica-name
set-existing-master
echo "Experimental: replicating existing master ${EXISTING_MASTER_ZONE}/${EXISTING_MASTER_NAME} as ${ZONE}/${REPLICA_NAME}"
# Before we do anything else, we should configure etcd to expect more replicas.
if ! add-replica-to-etcd 2379 2380; then
echo "Failed to add master replica to etcd cluster."
return 1
fi
if ! add-replica-to-etcd 4002 2381; then
echo "Failed to add master replica to etcd events cluster."
return 1
fi
# We have to make sure the disk is created before creating the master VM, so
# run this in the foreground.
gcloud compute disks create "${REPLICA_NAME}-pd" \
--project "${PROJECT}" \
--zone "${ZONE}" \
--type "${MASTER_DISK_TYPE}" \
--size "${MASTER_DISK_SIZE}"
# Sets MASTER_ROOT_DISK_SIZE that is used by create-master-instance
get-master-root-disk-size
local existing_master_replicas="$(get-all-replica-names)"
replicate-master-instance "${EXISTING_MASTER_ZONE}" "${EXISTING_MASTER_NAME}" "${existing_master_replicas}"
# Add new replica to the load balancer.
gcloud compute target-pools add-instances "${MASTER_NAME}" \
--project "${PROJECT}" \
--zone "${ZONE}" \
--instances "${REPLICA_NAME}"
}
# Detaches old and ataches new external IP to a VM.
#
# Arguments:
# $1 - VM name
# $2 - VM zone
# $3 - external static IP; if empty will use an ephemeral IP address.
function attach-external-ip() {
local NAME=${1}
local ZONE=${2}
local IP_ADDR=${3:-}
local ACCESS_CONFIG_NAME=$(gcloud compute instances describe "${NAME}" \
--project "${PROJECT}" --zone "${ZONE}" \
--format="value(networkInterfaces[0].accessConfigs[0].name)")
gcloud compute instances delete-access-config "${NAME}" \
--project "${PROJECT}" --zone "${ZONE}" \
--access-config-name "${ACCESS_CONFIG_NAME}"
if [[ -z ${IP_ADDR} ]]; then
gcloud compute instances add-access-config "${NAME}" \
--project "${PROJECT}" --zone "${ZONE}" \
--access-config-name "${ACCESS_CONFIG_NAME}"
else
gcloud compute instances add-access-config "${NAME}" \
--project "${PROJECT}" --zone "${ZONE}" \
--access-config-name "${ACCESS_CONFIG_NAME}" \
--address "${IP_ADDR}"
fi
}
# Creates load balancer in front of apiserver if it doesn't exists already. Assumes there's only one
# existing master replica.
#
# Assumes:
# PROJECT
# MASTER_NAME
# ZONE
# REGION
function create-loadbalancer() {
detect-master
# Step 0: Return early if LB is already configured.
if gcloud compute forwarding-rules describe ${MASTER_NAME} \
--project "${PROJECT}" --region ${REGION} > /dev/null 2>&1; then
echo "Load balancer already exists"
return
fi
local EXISTING_MASTER_ZONE=$(gcloud compute instances list "${MASTER_NAME}" \
--project "${PROJECT}" --format="value(zone)")
echo "Creating load balancer in front of an already existing master in ${EXISTING_MASTER_ZONE}"
# Step 1: Detach master IP address and attach ephemeral address to the existing master
attach-external-ip ${MASTER_NAME} ${EXISTING_MASTER_ZONE}
# Step 2: Create target pool.
gcloud compute target-pools create "${MASTER_NAME}" --region "${REGION}"
# TODO: We should also add master instances with suffixes
gcloud compute target-pools add-instances ${MASTER_NAME} --instances ${MASTER_NAME} --zone ${EXISTING_MASTER_ZONE}
# Step 3: Create forwarding rule.
# TODO: This step can take up to 20 min. We need to speed this up...
gcloud compute forwarding-rules create ${MASTER_NAME} \
--project "${PROJECT}" --region ${REGION} \
--target-pool ${MASTER_NAME} --address=${KUBE_MASTER_IP} --ports=443
echo -n "Waiting for the load balancer configuration to propagate..."
local counter=0
until $(curl -k -m1 https://${KUBE_MASTER_IP} &> /dev/null); do
counter=$((counter+1))
echo -n .
if [[ ${counter} -ge 1800 ]]; then
echo -e "${color_red}TIMEOUT${color_norm}" >&2
echo -e "${color_red}Load balancer failed to initialize within ${counter} seconds.${color_norm}" >&2
exit 2
fi
done
echo "DONE"
}
function create-nodes-firewall() {
# Create a single firewall rule for all minions.
create-firewall-rule "${NODE_TAG}-all" "${CLUSTER_IP_RANGE}" "${NODE_TAG}" &
# Report logging choice (if any).
if [[ "${ENABLE_NODE_LOGGING-}" == "true" ]]; then
echo "+++ Logging using Fluentd to ${LOGGING_DESTINATION:-unknown}"
fi
# Wait for last batch of jobs
kube::util::wait-for-jobs || {
echo -e "${color_red}Some commands failed.${color_norm}" >&2
}
}
function create-nodes-template() {
echo "Creating minions."
# TODO(zmerlynn): Refactor setting scope flags.
local scope_flags=
if [ -n "${NODE_SCOPES}" ]; then
scope_flags="--scopes ${NODE_SCOPES}"
else
scope_flags="--no-scopes"
fi
write-node-env
local template_name="${NODE_INSTANCE_PREFIX}-template"
create-node-instance-template $template_name
}
# Assumes:
# - MAX_INSTANCES_PER_MIG
# - NUM_NODES
# exports:
# - NUM_MIGS
function set_num_migs() {
local defaulted_max_instances_per_mig=${MAX_INSTANCES_PER_MIG:-1000}
if [[ ${defaulted_max_instances_per_mig} -le "0" ]]; then
echo "MAX_INSTANCES_PER_MIG cannot be negative. Assuming default 1000"
defaulted_max_instances_per_mig=1000
fi
export NUM_MIGS=$(((${NUM_NODES} + ${defaulted_max_instances_per_mig} - 1) / ${defaulted_max_instances_per_mig}))
}
# Assumes:
# - NUM_MIGS
# - NODE_INSTANCE_PREFIX
# - NUM_NODES
# - PROJECT
# - ZONE
function create-nodes() {
local template_name="${NODE_INSTANCE_PREFIX}-template"
local instances_left=${NUM_NODES}
#TODO: parallelize this loop to speed up the process
for ((i=1; i<=${NUM_MIGS}; i++)); do
local group_name="${NODE_INSTANCE_PREFIX}-group-$i"
if [[ $i == ${NUM_MIGS} ]]; then
# TODO: We don't add a suffix for the last group to keep backward compatibility when there's only one MIG.
# We should change it at some point, but note #18545 when changing this.
group_name="${NODE_INSTANCE_PREFIX}-group"
fi
# Spread the remaining number of nodes evenly
this_mig_size=$((${instances_left} / (${NUM_MIGS}-${i}+1)))
instances_left=$((instances_left-${this_mig_size}))
gcloud compute instance-groups managed \
create "${group_name}" \
--project "${PROJECT}" \
--zone "${ZONE}" \
--base-instance-name "${group_name}" \
--size "${this_mig_size}" \
--template "$template_name" || true;
gcloud compute instance-groups managed wait-until-stable \
"${group_name}" \
--zone "${ZONE}" \
--project "${PROJECT}" || true;
done
}
# Assumes:
# - NUM_MIGS
# - NODE_INSTANCE_PREFIX
# - PROJECT
# - ZONE
# - AUTOSCALER_MAX_NODES
# - AUTOSCALER_MIN_NODES
# Exports
# - AUTOSCALER_MIG_CONFIG
function create-cluster-autoscaler-mig-config() {
# Each MIG must have at least one node, so the min number of nodes
# must be greater or equal to the number of migs.
if [[ ${AUTOSCALER_MIN_NODES} < ${NUM_MIGS} ]]; then
echo "AUTOSCALER_MIN_NODES must be greater or equal ${NUM_MIGS}"
exit 2
fi
# Each MIG must have at least one node, so the min number of nodes
# must be greater or equal to the number of migs.
if [[ ${AUTOSCALER_MAX_NODES} < ${NUM_MIGS} ]]; then
echo "AUTOSCALER_MAX_NODES must be greater or equal ${NUM_MIGS}"
exit 2
fi
# The code assumes that the migs were created with create-nodes
# function which tries to evenly spread nodes across the migs.
AUTOSCALER_MIG_CONFIG=""
local left_min=${AUTOSCALER_MIN_NODES}
local left_max=${AUTOSCALER_MAX_NODES}