Centos8发布也有一段时间了，本文主要介绍Centos8如何实现自动更新，由于Centos8系统的变动比较大，所以与Centos7配置系统自动更新有所不同。
1、Centos8由yum全面转变为dnf，实现自动更新主要依靠dnf-automatic软件实现。
[root@uscdn2 ~]# yum search dnf-automatic
Last metadata expiration check: 0:21:44 ago on Wed 04 Dec 2019 09:48:48 PM CST.
================================================ Name Exactly Matched: dnf-automatic =================================================
dnf-automatic.noarch : Package manager - automated upgrades
[root@uscdn2 ~]# dnf install dnf-automatic
Last metadata expiration check: 0:27:24 ago on Wed 04 Dec 2019 09:48:48 PM CST.
Dependencies resolved.
======================================================================================================================================
Package Arch Version Repository Size
======================================================================================================================================
Installing:
dnf-automatic noarch 4.0.9.2-5.el8 BaseOS 133 k
Transaction Summary
======================================================================================================================================
Install 1 Package
Total download size: 133 k
Installed size: 46 k
Is this ok [y/N]: y
Downloading Packages:
dnf-automatic-4.0.9.2-5.el8.noarch.rpm 112 kB/s | 133 kB 00:01
--------------------------------------------------------------------------------------------------------------------------------------
Total 56 kB/s | 133 kB 00:02
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : dnf-automatic-4.0.9.2-5.el8.noarch 1/1
Running scriptlet: dnf-automatic-4.0.9.2-5.el8.noarch 1/1
Verifying : dnf-automatic-4.0.9.2-5.el8.noarch 1/1
Installed:
dnf-automatic-4.0.9.2-5.el8.noarch
Complete!
2、配置 /etc/dnf/automatic.conf 文件开启自动更新。
[root@uscdn2 ~]# vi /etc/dnf/automatic.conf
[commands]
# What kind of upgrade to perform:
# default = all avAIlable upgrades
# security = only the security upgrades
upgrade_type = default
random_sleep = 0
download_updates = yes
apply_updates = yes
3、启动自动更新并查看自动更新任务列表
[root@uscdn2 ~]# systemctl enable --now dnf-automatic.timer
Created symlink /etc/systemd/system/multi-user.target.wants/dnf-automatic.timer → /usr/lib/systemd/system/dnf-automatic.timer.
[root@uscdn2 ~]# systemctl list-timers *dnf-* --all
NEXT LEFT LAST PASSED UNIT ACTIVATES
Wed 2019-12-04 23:05:01 CST 44min left n/a n/a dnf-automatic.timer dnf-automatic.service
Wed 2019-12-04 23:11:10 CST 50min left Wed 2019-12-04 22:11:09 CST 9min ago dnf-makecache.timer dnf-makecache.service
2 timers listed.
