NVIDIA Jetson Nanoのセキュリティ対策

Ubuntuの自動アップデートを設定します。
再起動が必要な際は、指定した時間で再起動するように設定します。
自動アップデートの結果をメール送信するように設定します。

「unattended-upgrades」をインストールと有効化

「unattended-upgrades」をインストールします。

sudo apt install -y unattended-upgrades

インストールした「unattended-upgrades」を有効化します。
以下のコマンドを実行し、表示される画面で<Yes>を選択します。

sudo dpkg-reconfigure -p low unattended-upgrades

<Yes>を選択します。

「unattended-upgrades」設定

利用する設定ファイルは、以下の２つのファイルとなります。

• /etc/apt/apt.conf.d/20auto-upgrades 　： 自動アップデートとアップグレードを設定。
• /etc/apt/apt.conf.d/50unattended-upgrades　：詳細設定

「20auto-upgrades」設定

• APT::Periodic::Update-Package-Lists "1";
  アップグレードの確認間隔
  Daily=1 / Every two days = 2 / Weekly = 7 / Every two weeks = 14 / Never = 0
• APT::Periodic::Download-Upgradeable-Packages "1"
  セキュリティーアップデートがある場合の動作
  Download and install automatically = 1 / Download automatically = 1 / Display immediately = 0

APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Unattended-Upgrade "1";

「50unattended-upgrades」設定

以下の設定変更を加えました。

• Unattended-Upgrade::Mail "aaa@bbbl.com";
  メール通知先の設定
• Unattended-Upgrade::MailOnlyOnError "true";
  メール通知のタイミングをエラー発生時のみに変更
• Unattended-Upgrade::Remove-Unused-Kernel-Packages "true";
  未使用となったカーネル関連パッケージの自動削除
• Unattended-Upgrade::Remove-Unused-Dependencies "true";
  未使用となったパッケージの自動削除(apt-get autoremove)
• Unattended-Upgrade::Automatic-Reboot "true";
  自動再起動が実施されるように設定(自動再起動ON)
• Unattended-Upgrade::Automatic-Reboot-Time "02:00";
  再起動時の時間を指定

// Automatically upgrade packages from these (origin:archive) pairs
//
// Note that in Ubuntu security updates may pull in new dependencies
// from non-security sources (e.g. chromium). By allowing the release
// pocket these get automatically pulled in.
Unattended-Upgrade::Allowed-Origins {
        "${distro_id}:${distro_codename}";
        "${distro_id}:${distro_codename}-security";
        // Extended Security Maintenance; doesn't necessarily exist for
        // every release and this system may not have it installed, but if
        // available, the policy for updates is such that unattended-upgrades
        // should also install from here by default.
        "${distro_id}ESMApps:${distro_codename}-apps-security";
        "${distro_id}ESM:${distro_codename}-infra-security";
//      "${distro_id}:${distro_codename}-updates";
//      "${distro_id}:${distro_codename}-proposed";
//      "${distro_id}:${distro_codename}-backports";
};

// List of packages to not update (regexp are supported)
Unattended-Upgrade::Package-Blacklist {
//      "vim";
//      "libc6";
//      "libc6-dev";
//      "libc6-i686";
};

// This option will controls whether the development release of Ubuntu will be
// upgraded automatically.
Unattended-Upgrade::DevRelease "false";

// This option allows you to control if on a unclean dpkg exit
// unattended-upgrades will automatically run
//   dpkg --force-confold --configure -a
// The default is true, to ensure updates keep getting installed
//Unattended-Upgrade::AutoFixInterruptedDpkg "false";

// Split the upgrade into the smallest possible chunks so that
// they can be interrupted with SIGTERM. This makes the upgrade
// a bit slower but it has the benefit that shutdown while a upgrade
// is running is possible (with a small delay)
//Unattended-Upgrade::MinimalSteps "false";

// Install all unattended-upgrades when the machine is shutting down
// instead of doing it in the background while the machine is running
// This will (obviously) make shutdown slower
//Unattended-Upgrade::InstallOnShutdown "true";

// Send email to this address for problems or packages upgrades
// If empty or unset then no email is sent, make sure that you
// have a working mail setup on your system. A package that provides
// 'mailx' must be installed. E.g. "user@example.com"
//Unattended-Upgrade::Mail "root";
Unattended-Upgrade::Mail "aaa@bbb.com";

// Set this value to "true" to get emails only on errors. Default
// is to always send a mail if Unattended-Upgrade::Mail is set
//Unattended-Upgrade::MailOnlyOnError "true";
Unattended-Upgrade::MailOnlyOnError "true";

// Remove unused automatically installed kernel-related packages
// (kernel images, kernel headers and kernel version locked tools).
//Unattended-Upgrade::Remove-Unused-Kernel-Packages "false";
Unattended-Upgrade::Remove-Unused-Kernel-Packages "true";

// Do automatic removal of new unused dependencies after the upgrade
// (equivalent to apt-get autoremove)
//Unattended-Upgrade::Remove-Unused-Dependencies "false";
Unattended-Upgrade::Remove-Unused-Dependencies "true";

// Automatically reboot *WITHOUT CONFIRMATION*
//  if the file /var/run/reboot-required is found after the upgrade
//Unattended-Upgrade::Automatic-Reboot "false";
Unattended-Upgrade::Automatic-Reboot "true";

// If automatic reboot is enabled and needed, reboot at the specific
// time instead of immediately
//  Default: "now"
//Unattended-Upgrade::Automatic-Reboot-Time "02:00";
Unattended-Upgrade::Automatic-Reboot-Time "02:00";

// Use apt bandwidth limit feature, this example limits the download
// speed to 70kb/sec
//Acquire::http::Dl-Limit "70";

// Enable logging to syslog. Default is False
// Unattended-Upgrade::SyslogEnable "false";

// Specify syslog facility. Default is daemon
// Unattended-Upgrade::SyslogFacility "daemon";

// Download and install upgrades only on AC power
// (i.e. skip or gracefully stop updates on battery)
// Unattended-Upgrade::OnlyOnACPower "true";

// Download and install upgrades only on non-metered connection
// (i.e. skip or gracefully stop updates on a metered connection)
// Unattended-Upgrade::Skip-Updates-On-Metered-Connections "true";

動作確認

以下のコマンドで、動作確認を実施しておきます。

$ sudo unattended-upgrade --dry-run --debug

NVIDIA Jetson Nano 開発キット

created by Rinker

NVIDIA

¥19,000 (2021/08/19 16:46:56時点 Amazon調べ-詳細)

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