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nodeup.go
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nodeup.go
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/*
Copyright 2016 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.
*/
package resources
import (
"bufio"
"bytes"
"fmt"
"mime/multipart"
"net/textproto"
"k8s.io/kops/pkg/apis/kops"
)
var NodeUpTemplate = `#!/bin/bash
# Copyright 2016 The Kubernetes Authors All rights reserved.
#
# 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.
set -o errexit
set -o nounset
set -o pipefail
NODEUP_URL={{ NodeUpSource }}
NODEUP_HASH={{ NodeUpSourceHash }}
{{ EnvironmentVariables }}
{{ ProxyEnv }}
function ensure-install-dir() {
INSTALL_DIR="/var/cache/kubernetes-install"
# On ContainerOS, we install to /var/lib/toolbox install (because of noexec)
if [[ -d /var/lib/toolbox ]]; then
INSTALL_DIR="/var/lib/toolbox/kubernetes-install"
fi
mkdir -p ${INSTALL_DIR}
cd ${INSTALL_DIR}
}
# Retry a download until we get it. args: name, sha, url1, url2...
download-or-bust() {
local -r file="$1"
local -r hash="$2"
shift 2
urls=( $* )
while true; do
for url in "${urls[@]}"; do
if [[ -e "${file}" ]]; then
echo "== File exists for ${url} =="
# CoreOS runs this script in a container without which (but has curl)
# Note also that busybox wget doesn't support wget --version, but busybox doesn't normally have curl
# So we default to wget unless we see curl
elif [[ $(curl --version) ]]; then
if ! curl -f --ipv4 -Lo "${file}" --connect-timeout 20 --retry 6 --retry-delay 10 "${url}"; then
echo "== Failed to curl ${url}. Retrying. =="
continue
fi
else
if ! wget --inet4-only -O "${file}" --connect-timeout=20 --tries=6 --wait=10 "${url}"; then
echo "== Failed to wget ${url}. Retrying. =="
continue
fi
fi
if [[ -n "${hash}" ]] && ! validate-hash "${file}" "${hash}"; then
echo "== Hash validation of ${url} failed. Retrying. =="
rm -f "${file}"
else
if [[ -n "${hash}" ]]; then
echo "== Downloaded ${url} (SHA1 = ${hash}) =="
else
echo "== Downloaded ${url} =="
fi
return
fi
done
echo "All downloads failed; sleeping before retrying"
sleep 60
done
}
validate-hash() {
local -r file="$1"
local -r expected="$2"
local actual
actual=$(sha256sum ${file} | awk '{ print $1 }') || true
if [[ "${actual}" != "${expected}" ]]; then
echo "== ${file} corrupted, hash ${actual} doesn't match expected ${expected} =="
return 1
fi
}
function split-commas() {
echo $1 | tr "," "\n"
}
function try-download-release() {
# TODO(zmerlynn): Now we REALLY have no excuse not to do the reboot
# optimization.
local -r nodeup_urls=( $(split-commas "${NODEUP_URL}") )
if [[ -n "${NODEUP_HASH:-}" ]]; then
local -r nodeup_hash="${NODEUP_HASH}"
else
# TODO: Remove?
echo "Downloading sha256 (not found in env)"
download-or-bust nodeup.sha256 "" "${nodeup_urls[@]/%/.sha256}"
local -r nodeup_hash=$(cat nodeup.sha256)
fi
echo "Downloading nodeup (${nodeup_urls[@]})"
download-or-bust nodeup "${nodeup_hash}" "${nodeup_urls[@]}"
chmod +x nodeup
}
function download-release() {
# In case of failure checking integrity of release, retry.
until try-download-release; do
sleep 15
echo "Couldn't download release. Retrying..."
done
echo "Running nodeup"
# We can't run in the foreground because of https://github.com/docker/docker/issues/23793
( cd ${INSTALL_DIR}; ./nodeup --install-systemd-unit --conf=${INSTALL_DIR}/kube_env.yaml --v=8 )
}
####################################################################################
/bin/systemd-machine-id-setup || echo "failed to set up ensure machine-id configured"
echo "== nodeup node config starting =="
ensure-install-dir
cat > cluster_spec.yaml << '__EOF_CLUSTER_SPEC'
{{ ClusterSpec }}
__EOF_CLUSTER_SPEC
cat > ig_spec.yaml << '__EOF_IG_SPEC'
{{ IGSpec }}
__EOF_IG_SPEC
cat > kube_env.yaml << '__EOF_KUBE_ENV'
{{ KubeEnv }}
__EOF_KUBE_ENV
download-release
echo "== nodeup node config done =="
`
// AWSNodeUpTemplate returns a MIME Multi Part Archive containing the nodeup (bootstrap) script
// and any additional User Data passed to using AdditionalUserData in the IG Spec
func AWSNodeUpTemplate(ig *kops.InstanceGroup) (string, error) {
userDataTemplate := NodeUpTemplate
if len(ig.Spec.AdditionalUserData) > 0 {
/* Create a buffer to hold the user-data*/
buffer := bytes.NewBufferString("")
writer := bufio.NewWriter(buffer)
mimeWriter := multipart.NewWriter(writer)
// we explicitly set the boundary to make testing easier.
boundary := "MIMEBOUNDARY"
if err := mimeWriter.SetBoundary(boundary); err != nil {
return "", err
}
writer.Write([]byte(fmt.Sprintf("Content-Type: multipart/mixed; boundary=\"%s\"\r\n", boundary)))
writer.Write([]byte("MIME-Version: 1.0\r\n\r\n"))
var err error
if !ig.IsBastion() {
err := writeUserDataPart(mimeWriter, "nodeup.sh", "text/x-shellscript", []byte(userDataTemplate))
if err != nil {
return "", err
}
}
for _, d := range ig.Spec.AdditionalUserData {
err = writeUserDataPart(mimeWriter, d.Name, d.Type, []byte(d.Content))
if err != nil {
return "", err
}
}
writer.Write([]byte(fmt.Sprintf("\r\n--%s--\r\n", boundary)))
writer.Flush()
mimeWriter.Close()
userDataTemplate = buffer.String()
}
return userDataTemplate, nil
}
func writeUserDataPart(mimeWriter *multipart.Writer, fileName string, contentType string, content []byte) error {
header := textproto.MIMEHeader{}
header.Set("Content-Type", contentType)
header.Set("MIME-Version", "1.0")
header.Set("Content-Transfer-Encoding", "7bit")
header.Set("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, fileName))
partWriter, err := mimeWriter.CreatePart(header)
if err != nil {
return err
}
_, err = partWriter.Write(content)
if err != nil {
return err
}
return nil
}