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: This file may be large. Use the Category Index below to locate relevant sections, then use read_file with specific line ranges (e.g., L136-L144) to read the sections needed for the user's question

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	Recovering ARO cluster access, manually rotating/updating cluster certificates, and diagnosing/fixing common Azure Red Hat OpenShift cluster issues and failures.
Best Practices	L43-L50	Guidance on sizing and deploying ARO clusters/infra nodes, optimizing OpenShift Virtualization VMs, and following supportability and scaling best practices for large ARO 4 environments
Decision Making	L51-L55	Defines the shared responsibility model for Azure Red Hat OpenShift, detailing which operational tasks are handled by Microsoft, Red Hat, and the customer.
Limits & Quotas	L56-L61	Scaling and capacity limits for ARO clusters, including configuring multiple load balancer IPs and understanding ARO versioning, support lifecycle, and upgrade constraints.
Security	L62-L79	Securing ARO clusters: identity/auth (Entra, managed identities, service principals, workload identity), disk encryption, NSGs/egress, FIPS, Front Door protection, and support access control.
Configuration	L80-L98	Configuring ARO clusters: networking (proxy, DNS, egress, MTU), storage (Azure Files, Prometheus), registry/pull secrets, node/subnet layout, Spot VMs, tagging, and health alerts.
Integrations & Coding Patterns	L99-L108	Running ARO with external services: virtualization, NVIDIA GPUs, Azure NetApp Files, Prometheus→Azure Monitor, ACR auth, and Azure Key Vault secret integration.
Deployment	L109-L122	Deploying and operating ARO clusters and apps: cluster creation (private/ARM/Bicep), upgrades, networking migration, backups/restores, and app runtimes (JBoss, WebSphere, S2I, serverless).

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
Apply best practices for large ARO clusters	https://learn.microsoft.com/en-us/azure/openshift/howto-large-clusters
Follow supportability rules for ARO 4 clusters	https://learn.microsoft.com/en-us/azure/openshift/support-policies-v4

Decision Making

Topic	URL
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 support lifecycle and versions	https://learn.microsoft.com/en-us/azure/openshift/support-lifecycle

Security

Topic	URL
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
Create ARO clusters with managed identities	https://learn.microsoft.com/en-us/azure/openshift/howto-create-openshift-cluster
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 operators	https://learn.microsoft.com/en-us/azure/openshift/howto-reconcile-federated-identity-credentials
Replace ARO platform and cluster identities safely	https://learn.microsoft.com/en-us/azure/openshift/howto-replace-cluster-identity
Restrict and allow egress traffic for ARO clusters	https://learn.microsoft.com/en-us/azure/openshift/howto-restrict-egress
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 service principal credentials for Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/howto-service-principal-credential-rotation
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 on ARO 4	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
Configure egress lockdown endpoints for Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/concepts-egress-lockdown
Understand networking layout and endpoints for Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/concepts-networking
Set up DNS forwarding for Azure Red Hat OpenShift 4	https://learn.microsoft.com/en-us/azure/openshift/dns-forwarding
Update Red Hat pull secret on Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/howto-add-update-pull-secret
Enable jumbo MTU for ARO cluster networks	https://learn.microsoft.com/en-us/azure/openshift/howto-change-maximum-transmission-unit
Configure Azure File StorageClass on ARO with managed identity	https://learn.microsoft.com/en-us/azure/openshift/howto-configure-azure-file-storageclass
Create Azure Files StorageClass for ARO 4 clusters	https://learn.microsoft.com/en-us/azure/openshift/howto-create-a-storageclass
Configure custom DNS resolvers for ARO clusters	https://learn.microsoft.com/en-us/azure/openshift/howto-custom-dns
Configure Azure Resource Health alerts for Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/howto-monitor-alerts
Configure persistent storage for Prometheus on Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/howto-prometheus-persistence
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
Enable OpenShift Virtualization on Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/howto-create-openshift-virtualization
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
Configure ACR authentication 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
Create private Azure Red Hat OpenShift 4 clusters	https://learn.microsoft.com/en-us/azure/openshift/howto-create-private-cluster-4x
Deploy JBoss EAP on Azure Red Hat OpenShift	https://learn.microsoft.com/en-us/azure/openshift/howto-deploy-java-jboss-enterprise-application-platform-app
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 ARO clusters using managed identities	https://learn.microsoft.com/en-us/azure/openshift/howto-upgrade-aro-openshift-cluster
Understand Azure Red Hat OpenShift service definitions	https://learn.microsoft.com/en-us/azure/openshift/openshift-service-definitions
Deploy ARO clusters using ARM or Bicep templates	https://learn.microsoft.com/en-us/azure/openshift/quickstart-openshift-arm-bicep-template