CentOS 8 – Initial Server Setup

Use this tutorial to configure your CentOS 8 Linux machine for the first time. For example, you have launched a new VPS or dedicated host with CentOS 8, Follow the below steps to complete the initial server setup with CentOS 8.

Step 1 – Login to CentOS 8

Login to your CentOS 8 Linux machine. The desktop users can use the GUI interface to log in. Remote users connect to there server using SSH access.

ssh root@remote_server_ip

Step 2 – Update Current Pacakges

After login, first, update all the current packages on your system.

dnf clean all
dnf update

Step 3 – Install Required Packages

dnf install vim wget

Step 4 – Create User Account

Some of the cloud hosting providers like DigitalOcean provider root access only. This is the best practice to create a separate account for the system administrator works.

Use the following command to create user:

adduser rahul

Then set a strong password to the newly created account.

passwd rahul

You will need Sudo privileges to work with system admin tasks. The CentOS Linux systems have a default group named “wheel” with Sudo privileges. Add your newly created user to the wheel group.

usermod -aG wheel rahul

Step 5 – Setup Basic Firewall

If your CentOS 8 default installation does not have a firewall installed, follow the below steps to setup a firewall on your CentOS 8.

dnf install firewalld

After installation, start firewall service and enable it to auto-start on system boot.

systemctl start firewalld
systemctl enable firewalld

By default firewall allowed SSH access to remote users. You may also need to allow other services through the firewall to remote users.

You can directly provide a service name like “http” or “https” to allow. The firewalld uses /etc/services file to determine the corresponding port of the service.

firewall-cmd --permanent --add-service=http
firewall-cmd --permanent --add-service=https

If the service name is not defined in /etc/services, add allow access by port number directly. For example to allow TCP port 8080 or 10000 (default Webmin) to your firewall.

firewall-cmd --permanent --add-port=8080/tcp
firewall-cmd --permanent --add-port=10000/tcp

After making any changes to your firewall, make sure to reload changes using the following command.

firewall-cmd --reload

To view, all the allowed port and services use the following command.

firewall-cmd --permanent --list-all

Output:

public
  target: default
  icmp-block-inversion: no
  interfaces:
  sources:
  services: cockpit dhcpv6-client http https ssh
  ports: 8080/tcp 10000/tcp
  protocols:
  masquerade: no
  forward-ports:
  source-ports:
  icmp-blocks:
  rich rules:

Conclusion

Your CentOS 8 system is ready for use. Thank You.