Initial Settings : Update System
The package management tool DNF (Dandified YUM) has been set default on RHEL 8 / CentOS 8.
However, [yum] command is also located as a link to [dnf], so it's possbile to use [yum] or [dnf] with the same usage. Actually, the official documents on RedHat gives examples with [yum] command for RHEL 8.
(the documents on this site gives examples with [dnf] command)
[1]. [yum] and [dnf] are linked to [dnf-3] command.
[root@dlp ~]# which yum
/usr/bin/yum
[root@dlp ~]# ll /usr/bin/yum
lrwxrwxrwx. 1 root root 5 May 14 04:34 /usr/bin/yum -> dnf-3
[root@dlp ~]# which dnf
/usr/bin/dnf
[root@dlp ~]# ll /usr/bin/dnf
lrwxrwxrwx. 1 root root 5 May 14 04:34 /usr/bin/dnf -> dnf-3
[root@dlp ~]# ll /usr/bin/dnf-3
-rwxr-xr-x. 1 root root 1954 May 14 04:34 /usr/bin/dnf-3
# installed [yum] package
[root@dlp ~]# rpm -q yum
yum-4.0.9.2-5.el8.noarch
[root@dlp ~]# rpm -ql yum
/etc/yum.conf
/etc/yum/pluginconf.d
/etc/yum/protected.d
/etc/yum/vars
/usr/bin/yum
/usr/share/man/man1/yum-aliases.1.gz
/usr/share/man/man5/yum.conf.5.gz
/usr/share/man/man8/yum-shell.8.gz
/usr/share/man/man8/yum.8.gz
# included files are all links to [dnf]
[root@dlp ~]# ll /etc/yum.conf
lrwxrwxrwx. 1 root root 12 May 14 04:34 /etc/yum.conf -> dnf/dnf.conf
[root@dlp ~]# ll /etc/yum/vars
lrwxrwxrwx. 1 root root 11 May 14 04:34 /etc/yum/vars -> ../dnf/vars
[2]. After CentOS Server has been a production System, maybe it's difficult to update System, but at least after Installing, Update CentOS Server to the latest.
[root@dlp ~]# dnf -y upgrade
CentOS-8 - AppStream 2.5 kB/s | 4.3 kB 00:01
CentOS-8 - Base 2.4 kB/s | 3.8 kB 00:01
CentOS-8 - Extras 1.1 kB/s | 1.5 kB 00:01
Dependencies resolved.
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