OracleLinux
Oracle Linux provides a 100% application binary compatible alternative to Red Hat Enterprise Linux and CentOS Linux for both hybrid and multi-cloud environments.
Since 2006, Oracle Linux has been completely free to download and use. Source code, binaries and updates are provided free of charge. It is freely redistributable. Free for use in production environments.
We will proceed with the latest Oracle Linux 10.2 (released July, 2026).
１．Oracle Linux10.2 Download,Install
Download the Oracle Linux 10.2 installation image (OracleLinux-R10-U2-x86_64-dvd.iso ) from the following site
https://yum.oracle.com/oracle-linux-isos.html?source=:ow:o:p:nav:121620LinuxHero#content-1
Install USB media, change BIOS settings to boot from USB media, and install.
The installation procedure is the same as for Oracle Linux 10.0, so it will be omitted here. Please refer to the page below.
Initial setup after installation
1.Install bash completion extension package
# dnf -y install bash-completion
# reboot
2.Disabling SELinux
First, disable selinux. selinux is a feature that improves auditing and security in Linux, but when enabled, it places considerable restrictions on the behavior of services and on what can be configured. Therefore, it is basically disabled in many cases.
SELinux operating modes
Enforcing : SELinux functionality is enabled and access control is enabled
Permissive :SElinux will warn, but no access restrictions will be placed
disabled : Both SElinux function and access control are disabled
①Current SELinux status
# getenforce
Enforcing
②Switching to [permissive] mode
# setenforce 0
# getenforce
Permissive
③Switch to [enforcing] mode
# setenforce 1
# getenforce
Enforcing
④To completely disable SELinux, add selinux=0 to the kernel command line as shown below and then reboot.To completely disable SELinux, add `selinux=0` to the kernel command line as shown below and then reboot.
# grubby --update-kernel ALL --args selinux=0
# reboot
※ To return SELinux to active, do the following (reboot after changes)
# grubby --update-kernel ALL --remove-args selinux
# reboot
3.System Modernization
Stop the following services that you deem unnecessary.
# dnf -y update
4.Services to be stopped due to security measures
Stop the following services that you deem unnecessary.
# systemctl stop atd.service
# systemctl disable atd.service
# systemctl stop kdump.service
# systemctl disable kdump.service
# systemctl stop lvm2-monitor.service
# systemctl disable lvm2-monitor.service
# systemctl stop mdmonitor.service
# systemctl disable mdmonitor.service
# systemctl stop smartd.service
# systemctl disable smartd.service
# systemctl stop tuned.service
# systemctl disable tuned.service
# systemctl stop dm-event.socket
# systemctl disable dm-event.socket
5.Adding Repositories
5.1 Install EPEL repository for Oracle Linux
# dnf install https://dl.fedoraproject.org/pub/epel/10/Everything/x86_64/Packages/e/epel-release-10-8.el10_3.noarch.rpm
priority=10 ← Specify priority in the range of 1~99
# vi /etc/yum.repos.d/epel.repo
[epel]
name=Extra Packages for Enterprise Linux $releasever - $basearch
# It is much more secure to use the metalink, but if you wish to use a local mirror
# place its address here.
#baseurl=https://download.example/pub/epel/$releasever${releasever_minor:+z}/Everything/$basearch/
metalink=https://mirrors.fedoraproject.org/metalink?repo=epel${releasever_minor:+-z}-$releasever&arch=$basearch
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-$releasever_major
gpgcheck=1
repo_gpgcheck=0
metadata_expire=24h
countme=1
enabled=1
priority=10
[epel-debuginfo]
name=Extra Packages for Enterprise Linux $releasever - $basearch - Debug
# It is much more secure to use the metalink, but if you wish to use a local mirror
# place its address here.
5.2 Add Remi's RPM repository
# dnf -y install https://rpms.remirepo.net/enterprise/remi-release-10.rpm
priority=10 ← Specify priority in the range of 1~99
# vi /etc/yum.repos.d/remi-safe.repo
# This repository is safe to use with RHEL/CentOS base repository
# it only provides additional packages for the PHP stack
# all dependencies are in base repository or in EPEL
[remi-safe]
name=Safe Remi's RPM repository for Enterprise Linux $releasever_major - $basearch
#baseurl=http://rpms.remirepo.net/enterprise/$releasever_major/safe/$basearch/
#mirrorlist=https://rpms.remirepo.net/enterprise/$releasever_major/safe/$basearch/httpsmirror
mirrorlist=http://cdn.remirepo.net/enterprise/$releasever_major/safe/$basearch/mirror
enabled=1
priority=10
gpgcheck=1
# can be enabled if not behind a proxy because of possible cache issue
repo_gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi.el$releasever_major
[remi-safe-debuginfo]
name=Remi's RPM repository for Enterprise Linux $releasever_major - $basearch - debuginfo
6.Network configuration (command line configuration method)
6.1 Host Name Change
Change the host name to Lepard to try it out
# hostnamectl set-hostname Lepard
# cat /etc/hostname
Lepard
6.2 Static IP address setting
If the default setting is to obtain an IP address via DHCP during OS installation, change the network settings to a fixed IP address if necessary.
First, find out the name of your network interface with the following command
In this case, it is “ens160”.
# nmcli dev s
DEVICE TYPE STATE CONNECTION
ens160 ethernet connected ens160
lo loopback connected (externally) lo
Change it using the nmcli command.
Change the static IPv4 address to 192.168.11.83.
Fixed IPv4 address setting
# nmcli connection modify ens160 ipv4.addresses 192.168.11.83/24
Gateway Configuration
# nmcli connection modify ens160 ipv4.gateway 192.168.11.1
Referenced DNS settings
# nmcli connection modify ens160 ipv4.dns 192.168.11.1
DNS search base settings (own domain name)
# nmcli connection modify ens160 ipv4.dns-search [domain]
Set to fixed IP address assignment
# nmcli connection modify ens160 ipv4.method manual
Reboot interface to reflect settings
# nmcli connection down ens160; nmcli connection up ens160
Connection 'ens160' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/1)
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/2)
7.Network configuration (how to configure via GUI)
# nmtui
7.1 Static IP address setting
If the default setting for obtaining an IP address via DHCP is enabled during OS installation, change the network settings as needed to use a static IP address. In this case, the network interface name is "ens160".
Change the address of the IPv4 configuration
click OK.
7.2 Host Name Change
Change the host name to Lepard to try it out
8.Vim Settings
①Installing Vim Extensions
# dnf -y install vim-enhanced
②Apply and reflect Vim
# vi ~/.bashrc
Add alias to the last line
alias vi='vim'
# source ~/.bashrc
③Configure Vim as a user-specific environment
# vi ~/.vimrc
" Use vim's own extensions (not compatible with vi)
set nocompatible
" Specify character code
set encoding=utf-8
" Specify file encoding (read from the beginning until success)
set fileencodings=utf-8,iso-2022-jp,sjis,euc-jp
" Specify the line feed code to be recognized automatically
set fileformats=unix,dos
" Get Backup
set backup
" Specify the directory from which to obtain backups
set backupdir=~/backup
" Number of generations to keep search history
set history=50
" Do not distinguish between upper and lower case letters when searching
set ignorecase
" Mixing capital letters in search terms makes the search case sensitive
set smartcase
" Highlight words matching your search term
set hlsearch
" Use incremental search
set incsearch
" Display line numbers
set number
" Visualize line breaks ( $ ) and tabs ( ^I )
set list
" Highlight corresponding parentheses when entering parentheses
set showmatch
" No newlines at the end of files
set binary noeol
" Enable automatic indentation
set autoindent
" Color-coded display by syntax
syntax on
" Change color of comment text in case of syntax on
highlight Comment ctermfg=LightCyan
" Wrap lines by window width
set wrap
Please comment out any unnecessary items.