Install Red Hat OpenShift on RHEL 9

This guide provides a step-by-step installation of Red Hat OpenShift Container Platform (OCP) on RHEL 9 using User Provisioned Infrastructure (UPI).

1. Prerequisites

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- Minimum 3 RHEL 9 servers
- 16 GB RAM minimum per node
- 4 vCPU minimum per node
- Static IP addresses
- Fully Qualified Domain Names (FQDN)
- DNS configured properly
- Load Balancer configured
- Valid Red Hat subscription
- Internet access

2. Configure Hostname

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sudo hostnamectl set-hostname master1.ocp.example.com

3. Configure /etc/hosts

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sudo vi /etc/hosts

# Add:
192.168.1.10  api.ocp.example.com
192.168.1.11  master1.ocp.example.com
192.168.1.12  master2.ocp.example.com
192.168.1.13  master3.ocp.example.com

4. Register RHEL System

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sudo subscription-manager register
sudo subscription-manager attach --auto

5. Enable Required Repositories

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sudo subscription-manager repos \
--enable=rhel-9-for-x86_64-baseos-rpms \
--enable=rhel-9-for-x86_64-appstream-rpms

6. Update the System

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sudo dnf update -y
sudo reboot

7. Install Required Packages

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sudo dnf install -y wget git vim podman jq

8. Download OpenShift Installer

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wget https://mirror.openshift.com/pub/openshift-v4/clients/ocp/latest/openshift-install-linux.tar.gz

tar -xvf openshift-install-linux.tar.gz

sudo mv openshift-install /usr/local/bin/

9. Download OC Client

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wget https://mirror.openshift.com/pub/openshift-v4/clients/ocp/latest/openshift-client-linux.tar.gz

tar -xvf openshift-client-linux.tar.gz

sudo mv oc kubectl /usr/local/bin/

10. Verify Installation Tools

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openshift-install version
oc version
kubectl version --client

11. Create OpenShift Installation Directory

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mkdir ~/openshift-install
cd ~/openshift-install

12. Generate Install Configuration

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openshift-install create install-config

13. Create Cluster

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openshift-install create cluster --dir=~/openshift-install --log-level=info

14. Access OpenShift Web Console

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https://console-openshift-console.apps.ocp.example.com

15. Login Using OC CLI

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oc login -u kubeadmin -p  \
https://api.ocp.example.com:6443

16. Verify Cluster Nodes

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oc get nodes
oc get pods -A

17. Configure Firewall (Optional)

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sudo firewall-cmd --permanent --add-port=6443/tcp
sudo firewall-cmd --permanent --add-port=22623/tcp
sudo firewall-cmd --reload

18. Optional Post Installation Tasks

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- Configure storage classes
- Configure ingress
- Install Operators
- Configure monitoring
- Configure authentication
- Create projects and users