microsoftdocs/azure-redhat-openshift

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 | Guidance on sizing and configuring ARO clusters: infra nodes, large-cluster design, supported configs, and optimizing OpenShift Virtualization VM deployments. | | 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 ARO clusters with multiple load balancer IPs, plus hard/soft service limits, quotas, and key terms that constrain cluster size and usage. | | Security | L62-L79 | Identity, access, disk encryption, network egress, workload/managed identities, FIPS, Lockbox, and securing ARO apps with Azure Front Door and Microsoft Entra. | | Configuration | L80-L98 | Cluster-level setup for ARO: registry, networking (proxy, DNS, MTU, endpoints), storage (Azure Files, Prometheus), node/subnet layout, Spot VMs, capacity reservations, tags, and pull secrets. | | Integrations & Coding Patterns | L99-L107 | Guides for integrating ARO with GPUs, Azure NetApp Files, Azure Monitor (Prometheus), Container Registry, and Key Vault secrets, including setup and configuration patterns. | | Deployment | L108-L118 | 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 supported configuration policies 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 | | Review Azure Red Hat OpenShift service limits and terms | https://learn.microsoft.com/en-us/azure/openshift/openshift-service-definitions |

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 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 | | Replace Azure Red Hat OpenShift cluster identities | 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 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 | | 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 | | 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 Azure File StorageClass on ARO with managed identity | https://learn.microsoft.com/en-us/azure/openshift/howto-configure-azure-file-storageclass | | Create Azure Files storage class on ARO 4 | 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 Prometheus persistent storage on ARO clusters | 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 | |-------|-----| | 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 | | Create private Azure Red Hat OpenShift 4 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 | | Deploy ARO clusters using ARM or Bicep templates | https://learn.microsoft.com/en-us/azure/openshift/quickstart-openshift-arm-bicep-template |