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+# Red Hat Enterprise Linux (RHEL)
+
+## RHEL Support Subscription Registration
+
+In order to install packages via yum or dnf, RHEL 7/8 hosts are required to be registered for a valid Red Hat support subscription.
+
+You can apply for a 1-year Development support subscription by creating a [Red Hat Developers](https://developers.redhat.com/) account. Be aware though that as the Red Hat Developers subscription is limited to only 1 year, it should not be used to register RHEL 7/8 hosts provisioned in Production environments.
+
+Once you have a Red Hat support account, simply add the credentials to the Ansible inventory parameters `rh_subscription_username` and `rh_subscription_password` prior to deploying Kubespray. If your company has a Corporate Red Hat support account, then obtain an **Organization ID** and **Activation Key**, and add these to the Ansible inventory parameters `rh_subscription_org_id` and `rh_subscription_activation_key` instead of using your Red Hat support account credentials.
+
+```ini
+rh_subscription_username: ""
+rh_subscription_password: ""
+# rh_subscription_org_id: ""
+# rh_subscription_activation_key: ""
+```
+
+Either the Red Hat support account username/password, or Organization ID/Activation Key combination must be specified in the Ansible inventory in order for the Red Hat subscription registration to complete successfully during the deployment of Kubespray.
+
+Update the Ansible inventory parameters `rh_subscription_usage`, `rh_subscription_role` and `rh_subscription_sla` if necessary to suit your specific requirements.
+
+```ini
+rh_subscription_usage: "Development"
+rh_subscription_role: "Red Hat Enterprise Server"
+rh_subscription_sla: "Self-Support"
+```
+
+If the RHEL 7/8 hosts are already registered to a valid Red Hat support subscription via an alternative configuration management approach prior to the deployment of Kubespray, the successful RHEL `subscription-manager` status check will simply result in the RHEL subscription registration tasks being skipped.
+
+## RHEL 8
+
+RHEL 8 ships only with iptables-nft (ie without iptables-legacy)
+The only tested configuration for now is using Calico CNI
+You need to use K8S 1.17+ and to add `calico_iptables_backend: "NFT"` to your configuration
+
+If you have containers that are using iptables in the host network namespace (`hostNetwork=true`),
+you need to ensure they are using iptables-nft.
+An example how k8s do the autodetection can be found [in this PR](https://github.com/kubernetes/kubernetes/pull/82966)