provision Kubelet config file for GCE
This PR extends the client-side startup scripts to provision a Kubelet config file instead of legacy flags. This PR also extends the master/node init scripts to install this config file from the GCE metadata server, and provide the --config argument to the Kubelet.
This commit is contained in:
Michael Taufen
parent
cb5f1ad9f7
commit
420edc7b50
@ -1113,7 +1113,8 @@ function start-kubelet {
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echo "Using kubelet binary at ${kubelet_bin}"
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local -r kubelet_env_file="/etc/default/kubelet"
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echo "KUBELET_OPTS=\"${KUBELET_ARGS}\"" > "${kubelet_env_file}"
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local kubelet_opts="${KUBELET_ARGS} ${KUBELET_CONFIG_FILE_ARG:-}"
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echo "KUBELET_OPTS=\"${kubelet_opts}\"" > "${kubelet_env_file}"
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# Write the systemd service file for kubelet.
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cat <<EOF >/etc/systemd/system/kubelet.service
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@ -2483,6 +2484,12 @@ fi
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source "${KUBE_HOME}/kube-env"
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if [[ -f "${KUBE_HOME}/kubelet-config.yaml" ]]; then
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echo "Found Kubelet config file at ${KUBE_HOME}/kubelet-config.yaml"
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KUBELET_CONFIG_FILE_ARG="--config ${KUBE_HOME}/kubelet-config.yaml"
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fi
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if [[ -e "${KUBE_HOME}/kube-master-certs" ]]; then
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source "${KUBE_HOME}/kube-master-certs"
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fi
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@ -54,7 +54,8 @@ EOF
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function download-kube-env {
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# Fetch kube-env from GCE metadata server.
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(umask 077;
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(
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umask 077
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local -r tmp_kube_env="/tmp/kube-env.yaml"
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curl --fail --retry 5 --retry-delay 3 ${CURL_RETRY_CONNREFUSED} --silent --show-error \
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-H "X-Google-Metadata-Request: True" \
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@ -70,9 +71,30 @@ for k,v in yaml.load(sys.stdin).iteritems():
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)
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}
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function download-kubelet-config {
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local -r dest="$1"
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echo "Downloading Kubelet config file, if it exists"
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# Fetch kubelet config file from GCE metadata server.
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(
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umask 077
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local -r tmp_kubelet_config="/tmp/kubelet-config.yaml"
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if curl --fail --retry 5 --retry-delay 3 ${CURL_RETRY_CONNREFUSED} --silent --show-error \
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-H "X-Google-Metadata-Request: True" \
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-o "${tmp_kubelet_config}" \
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http://metadata.google.internal/computeMetadata/v1/instance/attributes/kubelet-config; then
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# only write to the final location if curl succeeds
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mv "${tmp_kubelet_config}" "${dest}"
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elif [[ "${REQUIRE_METADATA_KUBELET_CONFIG_FILE:-false}" == "true" ]]; then
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echo "== Failed to download required Kubelet config file from metadata server =="
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exit 1
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fi
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)
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}
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function download-kube-master-certs {
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# Fetch kube-env from GCE metadata server.
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(umask 077;
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(
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umask 077
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local -r tmp_kube_master_certs="/tmp/kube-master-certs.yaml"
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curl --fail --retry 5 --retry-delay 3 ${CURL_RETRY_CONNREFUSED} --silent --show-error \
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-H "X-Google-Metadata-Request: True" \
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@ -356,13 +378,24 @@ function install-kube-binary-config {
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######### Main Function ##########
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echo "Start to install kubernetes files"
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# if install fails, message-of-the-day (motd) will warn at login shell
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set-broken-motd
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KUBE_HOME="/home/kubernetes"
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KUBE_BIN="${KUBE_HOME}/bin"
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# download and source kube-env
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download-kube-env
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source "${KUBE_HOME}/kube-env"
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download-kubelet-config "${KUBE_HOME}/kubelet-config.yaml"
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# master certs
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if [[ "${KUBERNETES_MASTER:-}" == "true" ]]; then
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download-kube-master-certs
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fi
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# binaries and kube-system manifests
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install-kube-binary-config
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echo "Done for installing kubernetes files"
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@ -107,6 +107,7 @@ function create-master-instance-internal() {
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"${address:-}" "${enable_ip_aliases:-}" "${IP_ALIAS_SIZE:-}")
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local metadata="kube-env=${KUBE_TEMP}/master-kube-env.yaml"
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metadata="${metadata},kubelet-config=${KUBE_TEMP}/master-kubelet-config.yaml"
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metadata="${metadata},user-data=${KUBE_ROOT}/cluster/gce/gci/master.yaml"
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metadata="${metadata},configure-sh=${KUBE_ROOT}/cluster/gce/gci/configure.sh"
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metadata="${metadata},cluster-location=${KUBE_TEMP}/cluster-location.txt"
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@ -20,6 +20,7 @@ source "${KUBE_ROOT}/cluster/gce/gci/helper.sh"
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function get-node-instance-metadata {
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local metadata=""
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metadata+="kube-env=${KUBE_TEMP}/node-kube-env.yaml,"
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metadata+="kubelet-config=${KUBE_TEMP}/node-kubelet-config.yaml,"
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metadata+="user-data=${KUBE_ROOT}/cluster/gce/gci/node.yaml,"
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metadata+="configure-sh=${KUBE_ROOT}/cluster/gce/gci/configure.sh,"
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metadata+="cluster-location=${KUBE_TEMP}/cluster-location.txt,"
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@ -502,6 +502,7 @@ function write-master-env {
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construct-kubelet-flags true
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build-kube-env true "${KUBE_TEMP}/master-kube-env.yaml"
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build-kubelet-config true "${KUBE_TEMP}/master-kubelet-config.yaml"
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build-kube-master-certs "${KUBE_TEMP}/kube-master-certs.yaml"
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}
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@ -512,6 +513,7 @@ function write-node-env {
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construct-kubelet-flags false
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build-kube-env false "${KUBE_TEMP}/node-kube-env.yaml"
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build-kubelet-config false "${KUBE_TEMP}/node-kubelet-config.yaml"
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}
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function build-node-labels {
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@ -531,16 +533,89 @@ function build-node-labels {
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echo $node_labels
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}
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# yaml-map-string-stringarray converts the encoded structure to yaml format, and echoes the result
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# under the provided name. If the encoded structure is empty, echoes nothing.
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# 1: name to be output in yaml
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# 2: encoded map-string-string (which may contain duplicate keys - resulting in map-string-stringarray)
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# 3: key-value separator (defaults to ':')
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# 4: item separator (defaults to ',')
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function yaml-map-string-stringarray {
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declare -r name="${1}"
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declare -r encoded="${2}"
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declare -r kv_sep="${3:-:}"
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declare -r item_sep="${4:-,}"
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declare -a pairs # indexed array
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declare -A map # associative array
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IFS="${item_sep}" read -ra pairs <<<"${encoded}" # split on item_sep
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for pair in "${pairs[@]}"; do
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declare key
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declare value
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IFS="${kv_sep}" read -r key value <<<"${pair}" # split on kv_sep
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map[$key]="${map[$key]+${map[$key]}${item_sep}}${value}" # append values from duplicate keys
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done
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# only output if there is a non-empty map
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if [[ ${#map[@]} -gt 0 ]]; then
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echo "${name}:"
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for k in "${!map[@]}"; do
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echo " ${k}:"
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declare -a values
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IFS="${item_sep}" read -ra values <<<"${map[$k]}"
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for val in "${values[@]}"; do
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# declare across two lines so errexit can catch failures
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declare v
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v=$(yaml-quote "${val}")
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echo " - ${v}"
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done
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done
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fi
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}
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# yaml-map-string-string converts the encoded structure to yaml format, and echoes the result
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# under the provided name. If the encoded structure is empty, echoes nothing.
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# 1: name to be output in yaml
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# 2: encoded map-string-string (no duplicate keys)
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# 3: bool, whether to yaml-quote the value string in the output (defaults to true)
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# 4: key-value separator (defaults to ':')
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# 5: item separator (defaults to ',')
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function yaml-map-string-string {
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declare -r name="${1}"
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declare -r encoded="${2}"
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declare -r quote_val_string="${3:-true}"
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declare -r kv_sep="${4:-:}"
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declare -r item_sep="${5:-,}"
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declare -a pairs # indexed array
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declare -A map # associative array
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IFS="${item_sep}" read -ra pairs <<<"${encoded}" # split on item_sep # TODO(mtaufen): try quoting this too
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for pair in "${pairs[@]}"; do
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declare key
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declare value
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IFS="${kv_sep}" read -r key value <<<"${pair}" # split on kv_sep
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map[$key]="${value}" # add to associative array
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done
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# only output if there is a non-empty map
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if [[ ${#map[@]} -gt 0 ]]; then
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echo "${name}:"
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for k in "${!map[@]}"; do
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if [[ "${quote_val_string}" == "true" ]]; then
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# declare across two lines so errexit can catch failures
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declare v
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v=$(yaml-quote "${map[$k]}")
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echo " ${k}: ${v}"
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else
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echo " ${k}: ${map[$k]}"
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fi
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done
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fi
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}
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# $1: if 'true', we're rendering flags for a master, else a node
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function construct-kubelet-flags {
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local master=$1
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local flags="${KUBELET_TEST_LOG_LEVEL:-"--v=2"} ${KUBELET_TEST_ARGS:-}"
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flags+=" --allow-privileged=true"
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flags+=" --cgroup-root=/"
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flags+=" --cloud-provider=gce"
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flags+=" --cluster-dns=${DNS_SERVER_IP}"
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flags+=" --cluster-domain=${DNS_DOMAIN}"
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flags+=" --pod-manifest-path=/etc/kubernetes/manifests"
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# Keep in sync with CONTAINERIZED_MOUNTER_HOME in configure-helper.sh
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flags+=" --experimental-mounter-path=/home/kubernetes/containerized_mounter/mounter"
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flags+=" --experimental-check-node-capabilities-before-mount=true"
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@ -549,33 +624,17 @@ function construct-kubelet-flags {
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if [[ "${master}" == "true" ]]; then
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flags+=" ${MASTER_KUBELET_TEST_ARGS:-}"
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flags+=" --enable-debugging-handlers=false"
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flags+=" --hairpin-mode=none"
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if [[ "${REGISTER_MASTER_KUBELET:-false}" == "true" ]]; then
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#TODO(mikedanese): allow static pods to start before creating a client
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#flags+=" --bootstrap-kubeconfig=/var/lib/kubelet/bootstrap-kubeconfig"
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#flags+=" --kubeconfig=/var/lib/kubelet/kubeconfig"
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flags+=" --kubeconfig=/var/lib/kubelet/bootstrap-kubeconfig"
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flags+=" --register-schedulable=false"
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else
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# Note: Standalone mode is used by GKE
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flags+=" --pod-cidr=${MASTER_IP_RANGE}"
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fi
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else # For nodes
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flags+=" ${NODE_KUBELET_TEST_ARGS:-}"
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flags+=" --enable-debugging-handlers=true"
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flags+=" --bootstrap-kubeconfig=/var/lib/kubelet/bootstrap-kubeconfig"
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flags+=" --kubeconfig=/var/lib/kubelet/kubeconfig"
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if [[ "${HAIRPIN_MODE:-}" == "promiscuous-bridge" ]] || \
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[[ "${HAIRPIN_MODE:-}" == "hairpin-veth" ]] || \
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[[ "${HAIRPIN_MODE:-}" == "none" ]]; then
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flags+=" --hairpin-mode=${HAIRPIN_MODE}"
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fi
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flags+=" --anonymous-auth=false"
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flags+=" --authentication-token-webhook"
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flags+=" --authorization-mode=Webhook"
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# Keep client-ca-file in sync with CA_CERT_BUNDLE_PATH in configure-helper.sh
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flags+=" --client-ca-file=/etc/srv/kubernetes/pki/ca-certificates.crt"
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fi
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# Network plugin
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if [[ -n "${NETWORK_PROVIDER:-}" || -n "${NETWORK_POLICY_PROVIDER:-}" ]]; then
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@ -597,11 +656,6 @@ function construct-kubelet-flags {
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flags+=" --non-masquerade-cidr=${NON_MASQUERADE_CIDR}"
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fi
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flags+=" --volume-plugin-dir=${VOLUME_PLUGIN_DIR}"
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# Note: ENABLE_MANIFEST_URL is used by GKE
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if [[ "${ENABLE_MANIFEST_URL:-}" == "true" ]]; then
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flags+=" --manifest-url=${MANIFEST_URL}"
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flags+=" --manifest-url-header=${MANIFEST_URL_HEADER}"
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fi
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if [[ -n "${ENABLE_CUSTOM_METRICS:-}" ]]; then
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flags+=" --enable-custom-metrics=${ENABLE_CUSTOM_METRICS}"
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fi
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@ -612,12 +666,6 @@ function construct-kubelet-flags {
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if [[ -n "${NODE_TAINTS:-}" ]]; then
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flags+=" --register-with-taints=${NODE_TAINTS}"
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fi
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if [[ -n "${EVICTION_HARD:-}" ]]; then
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flags+=" --eviction-hard=${EVICTION_HARD}"
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fi
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if [[ -n "${FEATURE_GATES:-}" ]]; then
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flags+=" --feature-gates=${FEATURE_GATES}"
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fi
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# TODO(mtaufen): ROTATE_CERTIFICATES seems unused; delete it?
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if [[ -n "${ROTATE_CERTIFICATES:-}" ]]; then
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flags+=" --rotate-certificates=true"
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@ -633,6 +681,91 @@ function construct-kubelet-flags {
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KUBELET_ARGS="${flags}"
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}
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# $1: if 'true', we're rendering config for a master, else a node
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function build-kubelet-config {
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local master=$1
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local file=$2
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rm -f "${file}"
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{
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declare quoted_dns_server_ip
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declare quoted_dns_domain
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quoted_dns_server_ip=$(yaml-quote "${DNS_SERVER_IP}")
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quoted_dns_domain=$(yaml-quote "${DNS_DOMAIN}")
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cat <<EOF
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kind: KubeletConfiguration
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apiVersion: kubelet.config.k8s.io/v1beta1
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cgroupRoot: /
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clusterDNS:
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- ${quoted_dns_server_ip}
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clusterDomain: ${quoted_dns_domain}
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staticPodPath: /etc/kubernetes/manifests
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readOnlyPort: 10255
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EOF
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# --- begin master-specific config ---
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if [[ "${master}" == "true" ]]; then
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cat <<EOF
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enableDebuggingHandlers: false
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hairpinMode: none
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authentication:
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webhook:
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enabled: false
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anonymous:
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enabled: true
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authorization:
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mode: AlwaysAllow
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EOF
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if [[ "${REGISTER_MASTER_KUBELET:-false}" == "false" ]]; then
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# Note: Standalone mode is used by GKE
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declare quoted_master_ip_range
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quoted_master_ip_range=$(yaml-quote "${MASTER_IP_RANGE}")
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cat <<EOF
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podCidr: ${quoted_master_ip_range}
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EOF
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fi
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# --- end master-specific config ---
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else
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# --- begin node-specific config ---
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# Keep authentication.x509.clientCAFile in sync with CA_CERT_BUNDLE_PATH in configure-helper.sh
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cat <<EOF
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enableDebuggingHandlers: true
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authentication:
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x509:
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clientCAFile: /etc/srv/kubernetes/pki/ca-certificates.crt
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EOF
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if [[ "${HAIRPIN_MODE:-}" == "promiscuous-bridge" ]] || \
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[[ "${HAIRPIN_MODE:-}" == "hairpin-veth" ]] || \
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[[ "${HAIRPIN_MODE:-}" == "none" ]]; then
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declare quoted_hairpin_mode
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quoted_hairpin_mode=$(yaml-quote "${HAIRPIN_MODE}")
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cat <<EOF
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hairpinMode: ${quoted_hairpin_mode}
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EOF
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fi
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# --- end node-specific config ---
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fi
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# Note: ENABLE_MANIFEST_URL is used by GKE
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if [[ "${ENABLE_MANIFEST_URL:-}" == "true" ]]; then
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declare quoted_manifest_url
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quoted_manifest_url=$(yaml-quote "${MANIFEST_URL}")
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cat <<EOF
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staticPodURL: ${quoted_manifest_url}
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EOF
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yaml-map-string-stringarray 'staticPodURLHeader' "${MANIFEST_URL_HEADER}"
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fi
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if [[ -n "${EVICTION_HARD:-}" ]]; then
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yaml-map-string-string 'evictionHard' "${EVICTION_HARD}" true '<'
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fi
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if [[ -n "${FEATURE_GATES:-}" ]]; then
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yaml-map-string-string 'featureGates' "${FEATURE_GATES}" false '='
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fi
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} > "${file}"
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}
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function build-kube-master-certs {
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local file=$1
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rm -f ${file}
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@ -758,6 +891,7 @@ LOAD_IMAGE_COMMAND: $(yaml-quote ${LOAD_IMAGE_COMMAND:-})
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ZONE: $(yaml-quote ${ZONE})
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VOLUME_PLUGIN_DIR: $(yaml-quote ${VOLUME_PLUGIN_DIR})
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KUBELET_ARGS: $(yaml-quote ${KUBELET_ARGS})
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REQUIRE_METADATA_KUBELET_CONFIG_FILE: $(yaml-quote true)
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EOF
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if [[ "${master}" == "true" && "${MASTER_OS_DISTRIBUTION}" == "gci" ]] || \
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[[ "${master}" == "false" && "${NODE_OS_DISTRIBUTION}" == "gci" ]] || \
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@ -229,6 +229,7 @@ HTTP server: The kubelet can also listen for HTTP and respond to a simple API
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}
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// run the kubelet
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glog.V(5).Infof("KubeletConfiguration: %#v", kubeletServer.KubeletConfiguration)
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if err := Run(kubeletServer, kubeletDeps); err != nil {
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glog.Fatal(err)
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}
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