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197 lines
8.0 KiB
Bash
197 lines
8.0 KiB
Bash
#!/bin/bash
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# Copyright 2015 The Kubernetes Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This script contains functions for configuring instances to run kubernetes
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# master and nodes. It is uploaded as GCE instance metadata. The upstart jobs
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# in cluster/gce/trusty/<node.yaml, master.yaml> download it and make use
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# of needed functions. The script itself is not supposed to be executed in
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# other manners.
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set_broken_motd() {
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cat > /etc/motd <<EOF
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Broken (or in progress) Kubernetes node setup! If you are using Ubuntu Trusty,
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check log file /var/log/syslog. If you are using GCI image, use
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"journalctl | grep kube" to find more information.
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EOF
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}
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download_kube_env() {
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# Fetch kube-env from GCE metadata server.
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readonly tmp_kube_env="/tmp/kube-env.yaml"
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curl --fail --retry 5 --retry-delay 3 --silent --show-error \
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-H "X-Google-Metadata-Request: True" \
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-o "${tmp_kube_env}" \
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http://metadata.google.internal/computeMetadata/v1/instance/attributes/kube-env
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# Convert the yaml format file into a shell-style file.
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eval $(python -c '''
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import pipes,sys,yaml
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for k,v in yaml.load(sys.stdin).iteritems():
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print("readonly {var}={value}".format(var = k, value = pipes.quote(str(v))))
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''' < "${tmp_kube_env}" > /etc/kube-env)
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rm -f "${tmp_kube_env}"
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}
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validate_hash() {
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file="$1"
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expected="$2"
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actual=$(sha1sum ${file} | awk '{ print $1 }') || true
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if [ "${actual}" != "${expected}" ]; then
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echo "== ${file} corrupted, sha1 ${actual} doesn't match expected ${expected} =="
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return 1
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fi
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}
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# Retry a download until we get it. Takes a hash and a set of URLs.
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#
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# $1: The sha1 of the URL. Can be "" if the sha1 is unknown, which means
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# we are downloading a hash file.
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# $2: The temp file containing a list of urls to download.
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download_or_bust() {
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file_hash="$1"
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tmpfile_urls="$2"
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while true; do
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# Read urls from the file one-by-one.
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while read -r url; do
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if [ ! -n "${file_hash}" ]; then
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url="${url/.tar.gz/.tar.gz.sha1}"
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fi
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file="${url##*/}"
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rm -f "${file}"
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if ! curl -f --ipv4 -Lo "${file}" --connect-timeout 20 --retry 6 --retry-delay 10 "${url}"; then
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echo "== Failed to download ${url}. Retrying. =="
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elif [ -n "${file_hash}" ] && ! validate_hash "${file}" "${file_hash}"; then
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echo "== Hash validation of ${url} failed. Retrying. =="
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else
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if [ -n "${file_hash}" ]; then
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echo "== Downloaded ${url} (SHA1 = ${file_hash}) =="
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else
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echo "== Downloaded ${url} =="
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fi
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return
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fi
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done < "${tmpfile_urls}"
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done
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}
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# Downloads kubernetes binaries and kube-system manifest tarball, unpacks them,
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# and places them into suitable directories. Files are placed in /home/kubernetes.
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install_kube_binary_config() {
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# Upstart does not support shell array well. Put urls in a temp file with one
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# url at a line, and we will use 'read' command to get them one-by-one.
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tmp_binary_urls=$(mktemp /tmp/kube-temp.XXXXXX)
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echo "${SERVER_BINARY_TAR_URL}" | tr "," "\n" > "${tmp_binary_urls}"
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tmp_manifests_urls=$(mktemp /tmp/kube-temp.XXXXXX)
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echo "${KUBE_MANIFESTS_TAR_URL}" | tr "," "\n" > "${tmp_manifests_urls}"
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kube_home="/home/kubernetes"
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mkdir -p "${kube_home}"
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cd "${kube_home}"
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read -r server_binary_tar_url < "${tmp_binary_urls}"
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readonly server_binary_tar="${server_binary_tar_url##*/}"
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if [ -n "${SERVER_BINARY_TAR_HASH:-}" ]; then
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readonly server_binary_tar_hash="${SERVER_BINARY_TAR_HASH}"
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else
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echo "Downloading binary release sha1 (not found in env)"
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download_or_bust "" "${tmp_binary_urls}"
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readonly server_binary_tar_hash=$(cat "${server_binary_tar}.sha1")
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fi
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echo "Downloading binary release tar"
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download_or_bust "${server_binary_tar_hash}" "${tmp_binary_urls}"
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tar xzf "${kube_home}/${server_binary_tar}" -C "${kube_home}" --overwrite
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# Copy docker_tag and image files to /home/kubernetes/kube-docker-files.
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src_dir="${kube_home}/kubernetes/server/bin"
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dst_dir="${kube_home}/kube-docker-files"
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mkdir -p "${dst_dir}"
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cp "${src_dir}/"*.docker_tag "${dst_dir}"
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if [ "${KUBERNETES_MASTER:-}" = "false" ]; then
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cp "${src_dir}/kube-proxy.tar" "${dst_dir}"
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else
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cp "${src_dir}/kube-apiserver.tar" "${dst_dir}"
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cp "${src_dir}/kube-controller-manager.tar" "${dst_dir}"
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cp "${src_dir}/kube-scheduler.tar" "${dst_dir}"
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cp -r "${kube_home}/kubernetes/addons" "${dst_dir}"
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fi
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# Use the binary from the release tarball if they are not preinstalled, or if this is
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# a test cluster.
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readonly BIN_PATH="/usr/bin"
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if ! which kubelet > /dev/null || ! which kubectl > /dev/null; then
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# This should be the case of trusty.
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cp "${src_dir}/kubelet" "${BIN_PATH}"
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cp "${src_dir}/kubectl" "${BIN_PATH}"
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else
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# This should be the case of GCI.
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readonly kube_bin="${kube_home}/bin"
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mkdir -p "${kube_bin}"
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mount --bind "${kube_bin}" "${kube_bin}"
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mount -o remount,rw,exec "${kube_bin}"
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cp "${src_dir}/kubelet" "${kube_bin}"
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cp "${src_dir}/kubectl" "${kube_bin}"
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chmod 544 "${kube_bin}/kubelet"
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chmod 544 "${kube_bin}/kubectl"
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# If the built-in binary version is different from the expected version, we use
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# the downloaded binary. The simplest implementation is to always use the downloaded
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# binary without checking the version. But we have another version guardian in GKE.
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# So, we compare the versions to ensure this run-time binary replacement is only
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# applied for OSS kubernetes.
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readonly builtin_version="$(/usr/bin/kubelet --version=true | cut -f2 -d " ")"
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readonly required_version="$(/home/kubernetes/bin/kubelet --version=true | cut -f2 -d " ")"
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if [ "${TEST_CLUSTER:-}" = "true" ] || [ "${builtin_version}" != "${required_version}" ]; then
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mount --bind "${kube_bin}/kubelet" "${BIN_PATH}/kubelet"
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mount --bind "${kube_bin}/kubectl" "${BIN_PATH}/kubectl"
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else
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# Remove downloaded binary just to prevent misuse.
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rm -f "${kube_bin}/kubelet"
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rm -f "${kube_bin}/kubectl"
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fi
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fi
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cp "${kube_home}/kubernetes/LICENSES" "${kube_home}"
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# Put kube-system pods manifests in /home/kubernetes/kube-manifests/.
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dst_dir="${kube_home}/kube-manifests"
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mkdir -p "${dst_dir}"
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read -r manifests_tar_url < "${tmp_manifests_urls}"
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readonly manifests_tar="${manifests_tar_url##*/}"
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if [ -n "${KUBE_MANIFESTS_TAR_HASH:-}" ]; then
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readonly manifests_tar_hash="${KUBE_MANIFESTS_TAR_HASH}"
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else
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echo "Downloading k8s manifests sha1 (not found in env)"
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download_or_bust "" "${tmp_manifests_urls}"
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readonly manifests_tar_hash=$(cat "${manifests_tar}.sha1")
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fi
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echo "Downloading k8s manifests tar"
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download_or_bust "${manifests_tar_hash}" "${tmp_manifests_urls}"
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tar xzf "${kube_home}/${manifests_tar}" -C "${dst_dir}" --overwrite
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readonly kube_addon_registry="${KUBE_ADDON_REGISTRY:-gcr.io/google_containers}"
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if [ "${kube_addon_registry}" != "gcr.io/google_containers" ]; then
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find "${dst_dir}" -name \*.yaml -or -name \*.yaml.in | \
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xargs sed -ri "s@(image:\s.*)gcr.io/google_containers@\1${kube_addon_registry}@"
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find "${dst_dir}" -name \*.manifest -or -name \*.json | \
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xargs sed -ri "s@(image\":\s+\")gcr.io/google_containers@\1${kube_addon_registry}@"
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fi
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cp "${dst_dir}/kubernetes/gci-trusty/trusty-configure-helper.sh" /etc/kube-configure-helper.sh
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# Clean up.
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rm -rf "${kube_home}/kubernetes"
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rm -f "${kube_home}/${server_binary_tar}"
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rm -f "${kube_home}/${server_binary_tar}.sha1"
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rm -f "${kube_home}/${manifests_tar}"
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rm -f "${kube_home}/${manifests_tar}.sha1"
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rm -f "${tmp_binary_urls}"
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rm -f "${tmp_manifests_urls}"
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}
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