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5.2.1.2.6. Kubelet

Этапы установки компонента

  • Создание рабочих директорий.
  • Переменные окружения.
  • Инструкция загрузки.
  • Настройка прав.
  • Сервис загрузки.
  • Запуск сервиса загрузки.

Создание рабочих директорий

mkdir -p /etc/default/kubelet

Переменные окружения

cat <<EOF > /etc/default/kubelet/download.env
COMPONENT_VERSION="v1.30.4"
REPOSITORY="https://dl.k8s.io"
EOF

Инструкция загрузки

cat <<"EOF" > /etc/default/kubelet/download-script.sh
#!/bin/bash
set -Eeuo pipefail


COMPONENT_VERSION="${COMPONENT_VERSION:-v1.30.4}"
REPOSITORY="${REPOSITORY:-https://dl.k8s.io}"
PATH_BIN="${REPOSITORY}/${COMPONENT_VERSION}/bin/linux/amd64/kubelet"
PATH_SHA256="${REPOSITORY}/${COMPONENT_VERSION}/bin/linux/amd64/kubelet.sha256"
INSTALL_PATH="/usr/local/bin/kubelet"


LOG_TAG="kubelet-installer"
TMP_DIR="$(mktemp -d)"

logger -t "$LOG_TAG" "[INFO] Checking current kubelet version..."

CURRENT_VERSION=$($INSTALL_PATH --version 2>/dev/null | awk '{print $2}' | sed 's/v//') || CURRENT_VERSION="none"
COMPONENT_VERSION_CLEAN=$(echo "$COMPONENT_VERSION" | sed 's/^v//')

logger -t "$LOG_TAG" "[INFO] Current: $CURRENT_VERSION, Target: $COMPONENT_VERSION_CLEAN"

if [[ "$CURRENT_VERSION" != "$COMPONENT_VERSION_CLEAN" ]]; then
  logger -t "$LOG_TAG" "[INFO] Download URL: $PATH_BIN"
  logger -t "$LOG_TAG" "[INFO] Updating kubelet to version $COMPONENT_VERSION_CLEAN..."

  cd "$TMP_DIR"
  logger -t "$LOG_TAG" "[INFO] Working directory: $PWD"

  logger -t "$LOG_TAG" "[INFO] Downloading kubelet..."
  curl -fsSL -o kubelet "$PATH_BIN" || { logger -t "$LOG_TAG" "[ERROR] Failed to download kubelet"; exit 1; }

  logger -t "$LOG_TAG" "[INFO] Downloading checksum file..."
  curl -fsSL -o kubelet.sha256sum "$PATH_SHA256" || { logger -t "$LOG_TAG" "[ERROR] Failed to download checksum file"; exit 1; }

  logger -t "$LOG_TAG" "[INFO] Verifying checksum..."
  awk '{print $1"  kubelet"}' kubelet.sha256sum | sha256sum -c - || { logger -t "$LOG_TAG" "[ERROR] Checksum verification failed!"; exit 1; }

  logger -t "$LOG_TAG" "[INFO] Installing kubelet..."
  install -m 755 kubelet "$INSTALL_PATH"

  logger -t "$LOG_TAG" "[INFO] kubelet successfully updated to $COMPONENT_VERSION_CLEAN."
  rm -rf "$TMP_DIR"

else
  logger -t "$LOG_TAG" "[INFO] kubelet is already up to date. Skipping installation."
fi
EOF

Настройка прав

chmod +x /etc/default/kubelet/download-script.sh

Сервис загрузки

cat <<EOF > /usr/lib/systemd/system/kubelet-install.service
[Unit]
Description=Install and update kubelet
After=network.target
Wants=network-online.target

[Service]
Type=oneshot
EnvironmentFile=-/etc/default/kubelet/download.env
ExecStart=/bin/bash -c "/etc/default/kubelet/download-script.sh"
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target
EOF

Загрузка

systemctl enable kubelet-install.service
systemctl start kubelet-install.service