ubuntu自动更新--unattended-upgrades
- [1 介绍](#1 介绍)
- [2 发展历程](#2 发展历程)
- [3 配置与使用](#3 配置与使用)
- [4 disable Auto update](#4 disable Auto update)
- 参考
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。
shell
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 Shutdown
Loaded: loaded (/lib/systemd/system/unattended-upgrades.service; enabled; >
Active: active (running) since Wed 2025-04-06 06:25:39 CST; 12min ago
Docs: man:unattended-upgrade(8)
Main PID: 1003 (unattended-upgr)
Tasks: 2 (limit: 4551)
Memory: 11.7M
CPU: 264ms
CGroup: /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 Shutdown
Loaded: 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
shell
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