Azure Red Hat OpenShift Skill

This skill provides expert guidance for Azure Red Hat OpenShift. Covers troubleshooting, best practices, decision making, limits & quotas, security, configuration, integrations & coding patterns, and deployment. It combines local quick-reference content with remote documentation fetching capabilities.

How to Use This Skill

IMPORTANT for Agent: Use the Category Index below to locate relevant sections. For categories with line ranges (e.g., L35-L120), use read_file with the specified lines. For categories with file links (e.g., [security.md](security.md)), use read_file on the linked reference file

IMPORTANT for Agent: If metadata.generated_at is more than 3 months old, suggest the user pull the latest version from the repository. If mcp_microsoftdocs tools are not available, suggest the user install it: Installation Guide

This skill requires network access to fetch documentation content:

Preferred: Use mcp_microsoftdocs:microsoft_docs_fetch with query string from=learn-agent-skill. Returns Markdown.
Fallback: Use fetch_webpage with query string from=learn-agent-skill&accept=text/markdown. Returns Markdown.

Category Index

Category	Lines	Description
Troubleshooting	L36-L42	Fixing common ARO cluster issues, restoring cluster access, and manually updating or troubleshooting cluster certificates and connectivity via CLI
Best Practices	L43-L50	Best practices for sizing and deploying ARO clusters and infra nodes, optimizing OpenShift Virtualization VMs, and staying within supported configurations and policies.
Decision Making	L51-L58	Guidance on choosing ARO architectures and immutable settings, planning networking for hosted control planes, and understanding shared responsibilities between Microsoft, Red Hat, and customers.
Limits & Quotas	L59-L64	Scaling ARO clusters with multiple load balancer IPs and understanding built‑in service limits, quotas, and standard service definitions for Azure Red Hat OpenShift.
Security	L65-L84	Identity, access, and data protection for ARO: Entra auth, managed identities/SPs, workload identity, NSGs/egress control, disk/etcd encryption, FIPS, Front Door security, and support access control.
Configuration	L85-L111	Configuring ARO clusters: registries, pull secrets, DNS/proxy, storage classes, autoscaling/node pools, networking (MTU, subnets, Spot), identities, logging, alerts, and Prometheus storage.
Integrations & Coding Patterns	L112-L121	Patterns for connecting ARO apps to Azure services: workload identity, ACR, Key Vault, NetApp Files, GPU workloads, and exporting Prometheus metrics to Azure Monitor.
Deployment	L122-L133	Deploying and upgrading ARO clusters and apps: private/standard clusters, ARM/Bicep, WebSphere, S2I and serverless, Velero backup/restore, SDN-to-OVN migration, and HCP control plane/node pool upgrades.

Troubleshooting

Topic	URL
Regain ARO cluster access using Admin Kubeconfig	https://learn.microsoft.com/en-us/azure/openshift/howto-kubeconfig
Manually update ARO cluster certificates via CLI	https://learn.microsoft.com/en-us/azure/openshift/howto-update-certificates
Troubleshoot common Azure Red Hat OpenShift cluster issues	https://learn.microsoft.com/en-us/azure/openshift/troubleshoot

Best Practices

Topic	URL
Optimize VM deployments on OpenShift Virtualization in ARO	https://learn.microsoft.com/en-us/azure/openshift/best-practices-openshift-virtualization
Deploy and size infrastructure nodes in ARO	https://learn.microsoft.com/en-us/azure/openshift/howto-infrastructure-nodes
Deploy and manage large OpenShift clusters on Azure	https://learn.microsoft.com/en-us/azure/openshift/howto-large-clusters
Follow support policies for standard OpenShift clusters	https://learn.microsoft.com/en-us/azure/openshift/support-policies-v4

Decision Making

Topic	URL
Choose between standard and hosted OpenShift architectures	https://learn.microsoft.com/en-us/azure/openshift/concepts-classic-hosted-control-planes-comparison
Choose immutable settings for ARO HCP clusters	https://learn.microsoft.com/en-us/azure/openshift/howto-choose-cluster-configuration
Plan networking for ARO hosted control planes	https://learn.microsoft.com/en-us/azure/openshift/howto-plan-cluster-network
Understand responsibility matrix for ARO operations	https://learn.microsoft.com/en-us/azure/openshift/responsibility-matrix

Limits & Quotas

Topic	URL
Configure multiple load balancer IPs to scale ARO clusters	https://learn.microsoft.com/en-us/azure/openshift/howto-multiple-ips
Understand Azure Red Hat OpenShift standard service definitions	https://learn.microsoft.com/en-us/azure/openshift/openshift-service-definitions

Security

Topic	URL
Configure managed identities and roles for ARO HCP	https://learn.microsoft.com/en-us/azure/openshift/concepts-managed-identities
Configure Microsoft Entra auth for ARO via CLI	https://learn.microsoft.com/en-us/azure/openshift/configure-azure-ad-cli
Configure Microsoft Entra auth for ARO via portal	https://learn.microsoft.com/en-us/azure/openshift/configure-azure-ad-ui
Use custom Network Security Groups with Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/howto-bring-nsg
Encrypt ARO OS disks with customer-managed keys	https://learn.microsoft.com/en-us/azure/openshift/howto-byok
Configure external OIDC authentication for ARO HCP	https://learn.microsoft.com/en-us/azure/openshift/howto-configure-external-authentication
Create service principal for Azure Red Hat OpenShift deployment	https://learn.microsoft.com/en-us/azure/openshift/howto-create-service-principal
Configure applications with ARO workload identity	https://learn.microsoft.com/en-us/azure/openshift/howto-deploy-configure-application
Enable FIPS-compliant cryptography on Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/howto-enable-fips-openshift
Reconcile federated identity credentials for ARO clusters	https://learn.microsoft.com/en-us/azure/openshift/howto-reconcile-federated-identity-credentials
Restrict and allow egress traffic for ARO clusters	https://learn.microsoft.com/en-us/azure/openshift/howto-restrict-egress
Rotate customer-managed etcd KMS keys in ARO HCP	https://learn.microsoft.com/en-us/azure/openshift/howto-rotate-encryption-key
Secure Azure Red Hat OpenShift apps with Azure Front Door	https://learn.microsoft.com/en-us/azure/openshift/howto-secure-openshift-with-front-door
Rotate Microsoft Entra service principal credentials for ARO	https://learn.microsoft.com/en-us/azure/openshift/howto-service-principal-credential-rotation
Configure and use managed identities in Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/howto-understand-managed-identities
Control Microsoft support access to ARO with Azure Lockbox	https://learn.microsoft.com/en-us/azure/openshift/howto-use-lockbox

Configuration

Topic	URL
Configure built-in container registry for Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/built-in-container-registry
Configure cluster-wide HTTP/HTTPS proxy in ARO	https://learn.microsoft.com/en-us/azure/openshift/cluster-wide-proxy-configure
Set up DNS forwarding for Azure Red Hat OpenShift 4	https://learn.microsoft.com/en-us/azure/openshift/dns-forwarding
Add pull secrets for private registries on ARO HCP	https://learn.microsoft.com/en-us/azure/openshift/how-to-add-pull-secrets
Manage Red Hat pull secrets on ARO clusters	https://learn.microsoft.com/en-us/azure/openshift/howto-add-update-pull-secret
Configure capacity reservations with ARO machine sets	https://learn.microsoft.com/en-us/azure/openshift/howto-capacity-reservations
Enable jumbo MTU for ARO cluster networks	https://learn.microsoft.com/en-us/azure/openshift/howto-change-maximum-transmission-unit
Configure cluster autoscaling for ARO HCP	https://learn.microsoft.com/en-us/azure/openshift/howto-cluster-auto-scaling
Configure Azure File StorageClass on ARO with managed identity	https://learn.microsoft.com/en-us/azure/openshift/howto-configure-azure-file-storageclass
Configure Azure Files StorageClass on ARO HCP	https://learn.microsoft.com/en-us/azure/openshift/howto-configure-azure-files-hosted-cluster
Configure image digest mirrors for immutable images on ARO	https://learn.microsoft.com/en-us/azure/openshift/howto-configure-cluster-immutable-images
Create Azure Files storage class on ARO 4	https://learn.microsoft.com/en-us/azure/openshift/howto-create-a-storageclass
Create node pools for ARO hosted control planes	https://learn.microsoft.com/en-us/azure/openshift/howto-create-hosted-node-pool
Configure managed identities for standard OpenShift clusters	https://learn.microsoft.com/en-us/azure/openshift/howto-create-openshift-cluster
Configure custom DNS resolvers for ARO clusters	https://learn.microsoft.com/en-us/azure/openshift/howto-custom-dns
Enable and route ARO HCP control plane logs	https://learn.microsoft.com/en-us/azure/openshift/howto-enable-control-plane-logs
Scale and configure ARO HCP node pools	https://learn.microsoft.com/en-us/azure/openshift/howto-manage-hosted-node-pools
Configure Azure Resource Health alerts for Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/howto-monitor-alerts
Configure Prometheus persistent storage on ARO clusters	https://learn.microsoft.com/en-us/azure/openshift/howto-prometheus-persistence
Update workload and cluster identities in Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/howto-replace-cluster-identity
Segregate ARO worker nodes into subnet groups	https://learn.microsoft.com/en-us/azure/openshift/howto-segregate-machinesets
Configure Azure Spot VMs in ARO clusters	https://learn.microsoft.com/en-us/azure/openshift/howto-spot-nodes
Tag ARO managed resources using Azure Policy	https://learn.microsoft.com/en-us/azure/openshift/howto-tag-resources

Integrations & Coding Patterns

Topic	URL
Use Azure Workload Identity in ARO HCP applications	https://learn.microsoft.com/en-us/azure/openshift/howto-deploy-configure-application-with-workload-identity
Run NVIDIA GPU workloads on Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/howto-gpu-workloads
Configure Azure NetApp Files storage for ARO	https://learn.microsoft.com/en-us/azure/openshift/howto-netapp-files
Send ARO Prometheus metrics to Azure Monitor via remote write	https://learn.microsoft.com/en-us/azure/openshift/howto-remotewrite-prometheus
Integrate Azure Container Registry with Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/howto-use-acr-with-aro
Integrate Azure Key Vault secrets with Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/howto-use-key-vault-secrets

Deployment

Topic	URL
Back up Azure Red Hat OpenShift apps with Velero	https://learn.microsoft.com/en-us/azure/openshift/howto-create-a-backup
Restore Azure Red Hat OpenShift apps with Velero	https://learn.microsoft.com/en-us/azure/openshift/howto-create-a-restore
Deploy private Azure Red Hat OpenShift standard clusters	https://learn.microsoft.com/en-us/azure/openshift/howto-create-private-cluster-4x
Deploy WebSphere Liberty on Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/howto-deploy-java-liberty-app
Deploy applications from source to ARO using S2I	https://learn.microsoft.com/en-us/azure/openshift/howto-deploy-with-s2i
Deploy serverless applications on Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/howto-deploy-with-serverless
Migrate ARO networking from OpenShift SDN to OVN-Kubernetes	https://learn.microsoft.com/en-us/azure/openshift/howto-sdn-to-ovn
Upgrade control plane and node pools in ARO HCP	https://learn.microsoft.com/en-us/azure/openshift/howto-upgrade-cluster
Deploy standard OpenShift clusters with ARM or Bicep	https://learn.microsoft.com/en-us/azure/openshift/quickstart-openshift-arm-bicep-template

azure-redhat-openshift