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1 介绍

Unattended-Upgrades 是一个用于自动更新 Debian 及其衍生系统（如 Ubuntu）的工具。它的主要功能是自动检查、下载并安装系统更新，特别是安全更新，从而确保系统的安全性和稳定性。该工具通过后台运行，无需用户干预，大大简化了系统维护工作。

2 发展历程

Unattended-Upgrades 最初是为了简化 Debian 系统的安全更新流程而开发的。随着 Ubuntu 的发展，它逐渐成为 Ubuntu 系统中默认安装的组件之一。从 Ubuntu 16.04 开始，Unattended-Upgrades 的更新触发机制从传统的 cron 定时任务转变为通过 systemd 的 timer unit 来实现。这种改进使得更新任务的调度更加灵活和高效。

3 配置与使用

安装：可以通过命令 sudo apt-get install unattended-upgrades 安装该工具。
配置：主要配置文件位于 /etc/apt/apt.conf.d/50unattended-upgrades，用户可以在此文件中指定自动更新的规则，例如允许更新的软件源、是否自动移除未使用的依赖包等。
自定义更新频率：通过编辑 /etc/apt/apt.conf.d/20auto-upgrades 文件，可以设置更新检查和安装的频率。

bot@u22:/etc/apt/apt.conf.d$ ls
00aptitude        15update-stamp       20packagekit           60icons
00trustcdrom      20apt-esm-hook.conf  20snapd.conf           60icons-hidpi
01autoremove      20archive            50appstream            70debconf
01-vendor-ubuntu  20auto-upgrades      50command-not-found    99update-notifier
10periodic        20dbus               50unattended-upgrades
bot@u22:/etc/apt/apt.conf.d$ cat 20auto-upgrades 
APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Unattended-Upgrade "1";

4 disable Auto update

Ubuntu uses the unattended-upgrades package to handle automatic updates. You can disable this service to prevent automatic updates.

# 显示状态
bot@u22:~/sen$ systemctl status unattended-upgrades
● unattended-upgrades.service - Unattended Upgrades ShutdownLoaded: loaded (/lib/systemd/system/unattended-upgrades.service; enabled; >Active: active (running) since Wed 2025-04-06 06:25:39 CST; 12min agoDocs: man:unattended-upgrade(8)Main PID: 1003 (unattended-upgr)Tasks: 2 (limit: 4551)Memory: 11.7MCPU: 264msCGroup: /system.slice/unattended-upgrades.service└─1003 /usr/bin/python3 /usr/share/unattended-upgrades/unattended->4月 06 06:25:39 u22 systemd[1]: Started Unattended Upgrades Shutdown.
# 停止服务
bot@u22:~/sen$ sudo systemctl stop unattended-upgrades
[sudo] password for bot: 
# 取消服务的开机启动
bot@u22:~/sen$ sudo systemctl disable unattended-upgrades
Synchronizing state of unattended-upgrades.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install disable unattended-upgrades
Removed /etc/systemd/system/multi-user.target.wants/unattended-upgrades.service.
bot@u22:~/sen$ systemctl status unattended-upgrades
○ unattended-upgrades.service - Unattended Upgrades ShutdownLoaded: loaded (/lib/systemd/system/unattended-upgrades.service; disabled;>Active: inactive (dead)Docs: man:unattended-upgrade(8)4月 06 06:25:39 u22 systemd[1]: Started Unattended Upgrades Shutdown.
4月 06 06:52:48 u22 systemd[1]: Stopping Unattended Upgrades Shutdown...
4月 06 06:52:48 u22 systemd[1]: unattended-upgrades.service: Deactivated succes>
4月 06 06:52:48 u22 systemd[1]: Stopped Unattended Upgrades Shutdown.
bot@u22:~/sen$

服务命令

systemctl enable：除了激活服务以外，也可以置服务为开机启动
systemctl disable：取消服务的开机启动systemctl start：依次启动定义在 Unit 文件中的 ExecStartPre、ExecStart 和 ExecStartPost 命令
systemctl stop：依次停止定义在 Unit 文件中的 ExecStopPre、ExecStop 和 ExecStopPost 命令
systemctl restart：重启服务
systemctl kill：立即杀死服务service service_name status：查看服务状态

参考

1、How to disable Auto update for my instance
2、Linux 服务管理 service systemd systemctl