1---2name: azure-redhat-openshift3description: Expert knowledge for Azure Red Hat OpenShift development including troubleshooting, best practices, decision making, limits & quotas, security, configuration, integrations & coding patterns, and deployment. Use when creating ARO clusters, configuring networking/storage, securing Entra auth & CMK, or integrating GPUs/NetApp Files, and other Azure Red Hat OpenShift related development tasks. Not for Azure Kubernetes Service (AKS) (use azure-kubernetes-service), Azure Container Apps (use azure-container-apps), Azure Container Instances (use azure-container-instances).4---5# Azure Red Hat OpenShift Skill
6
7This 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.
8
9## How to Use This Skill
10
11> **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
12
13> **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](https://github.com/MicrosoftDocs/mcp/blob/main/README.md)
14
15This skill requires **network access** to fetch documentation content:
16- **Preferred**: Use `mcp_microsoftdocs:microsoft_docs_fetch` with query string `from=learn-agent-skill`. Returns Markdown.
17- **Fallback**: Use `fetch_webpage` with query string `from=learn-agent-skill&accept=text/markdown`. Returns Markdown.
18
19## Category Index
20
21| Category | Lines | Description |
22|----------|-------|-------------|
23| Troubleshooting | L36-L42 | Fixing common ARO cluster issues, restoring cluster access, and manually updating or troubleshooting cluster certificates and connectivity via CLI |
24| Best Practices | L43-L50 | Guidance on sizing and deploying ARO infrastructure and large clusters, optimizing OpenShift Virtualization VMs, and understanding ARO 4 support policies and limits |
25| Decision Making | L51-L55 | Roles and responsibilities for managing ARO clusters and guidance on ARO version lifecycle, support timelines, and upgrade planning. |
26| 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. |
27| Security | L62-L78 | Identity, encryption, and network security for ARO: Entra auth, service/managed identities, disk CMK, FIPS, egress control, Front Door, Lockbox, and support/credential rotation policies. |
28| Configuration | L79-L98 | Configuring ARO clusters: networking (DNS, proxy, MTU, subnets, Spot VMs), identities and pull secrets, storage (Azure Files, Prometheus), registry, alerts, and resource tagging. |
29| 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. |
30| 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). |
31
32### Troubleshooting
33| Topic | URL |
34|-------|-----|
35| Regain ARO cluster access using Admin Kubeconfig | https://learn.microsoft.com/en-us/azure/openshift/howto-kubeconfig |
36| Manually update ARO cluster certificates via CLI | https://learn.microsoft.com/en-us/azure/openshift/howto-update-certificates |
37| Troubleshoot common Azure Red Hat OpenShift cluster issues | https://learn.microsoft.com/en-us/azure/openshift/troubleshoot |
38
39### Best Practices
40| Topic | URL |
41|-------|-----|
42| Optimize VM deployments on OpenShift Virtualization in ARO | https://learn.microsoft.com/en-us/azure/openshift/best-practices-openshift-virtualization |
43| Deploy and size infrastructure nodes in ARO | https://learn.microsoft.com/en-us/azure/openshift/howto-infrastructure-nodes |
44| Apply best practices for large ARO clusters | https://learn.microsoft.com/en-us/azure/openshift/howto-large-clusters |
45| Follow Azure Red Hat OpenShift 4 support policies | https://learn.microsoft.com/en-us/azure/openshift/support-policies-v4 |
46
47### Decision Making
48| Topic | URL |
49|-------|-----|
50| Understand responsibility matrix for ARO operations | https://learn.microsoft.com/en-us/azure/openshift/responsibility-matrix |
51
52### Limits & Quotas
53| Topic | URL |
54|-------|-----|
55| Configure multiple load balancer IPs to scale ARO clusters | https://learn.microsoft.com/en-us/azure/openshift/howto-multiple-ips |
56| Review Azure Red Hat OpenShift service limits and terms | https://learn.microsoft.com/en-us/azure/openshift/openshift-service-definitions |
57
58### Security
59| Topic | URL |
60|-------|-----|
61| Configure Microsoft Entra auth for ARO via CLI | https://learn.microsoft.com/en-us/azure/openshift/configure-azure-ad-cli |
62| Configure Microsoft Entra auth for ARO via portal | https://learn.microsoft.com/en-us/azure/openshift/configure-azure-ad-ui |
63| Use custom Network Security Groups with Azure Red Hat OpenShift | https://learn.microsoft.com/en-us/azure/openshift/howto-bring-nsg |
64| Encrypt ARO OS disks with customer-managed keys | https://learn.microsoft.com/en-us/azure/openshift/howto-byok |
65| Create service principal for Azure Red Hat OpenShift deployment | https://learn.microsoft.com/en-us/azure/openshift/howto-create-service-principal |
66| Configure applications with ARO workload identity | https://learn.microsoft.com/en-us/azure/openshift/howto-deploy-configure-application |
67| Enable FIPS-compliant cryptography on Azure Red Hat OpenShift | https://learn.microsoft.com/en-us/azure/openshift/howto-enable-fips-openshift |
68| Reconcile federated identity credentials for ARO clusters | https://learn.microsoft.com/en-us/azure/openshift/howto-reconcile-federated-identity-credentials |
69| Restrict and allow egress traffic for ARO clusters | https://learn.microsoft.com/en-us/azure/openshift/howto-restrict-egress |
70| Secure Azure Red Hat OpenShift apps with Azure Front Door | https://learn.microsoft.com/en-us/azure/openshift/howto-secure-openshift-with-front-door |
71| Rotate Microsoft Entra service principal credentials for ARO | https://learn.microsoft.com/en-us/azure/openshift/howto-service-principal-credential-rotation |
72| Configure and use managed identities in Azure Red Hat OpenShift | https://learn.microsoft.com/en-us/azure/openshift/howto-understand-managed-identities |
73| Control Microsoft support access to ARO with Azure Lockbox | https://learn.microsoft.com/en-us/azure/openshift/howto-use-lockbox |
74
75### Configuration
76| Topic | URL |
77|-------|-----|
78| Configure built-in container registry for Azure Red Hat OpenShift | https://learn.microsoft.com/en-us/azure/openshift/built-in-container-registry |
79| Configure cluster-wide HTTP/HTTPS proxy in ARO | https://learn.microsoft.com/en-us/azure/openshift/cluster-wide-proxy-configure |
80| Set up DNS forwarding for Azure Red Hat OpenShift 4 | https://learn.microsoft.com/en-us/azure/openshift/dns-forwarding |
81| Update Red Hat pull secret on Azure Red Hat OpenShift | https://learn.microsoft.com/en-us/azure/openshift/howto-add-update-pull-secret |
82| Configure capacity reservations with ARO machine sets | https://learn.microsoft.com/en-us/azure/openshift/howto-capacity-reservations |
83| Enable jumbo MTU for ARO cluster networks | https://learn.microsoft.com/en-us/azure/openshift/howto-change-maximum-transmission-unit |
84| Configure Azure File StorageClass on ARO with managed identity | https://learn.microsoft.com/en-us/azure/openshift/howto-configure-azure-file-storageclass |
85| Create Azure Files storage class on ARO 4 | https://learn.microsoft.com/en-us/azure/openshift/howto-create-a-storageclass |
86| Configure Azure Red Hat OpenShift clusters with managed identities | https://learn.microsoft.com/en-us/azure/openshift/howto-create-openshift-cluster |
87| Configure custom DNS resolvers for ARO clusters | https://learn.microsoft.com/en-us/azure/openshift/howto-custom-dns |
88| Configure Azure Resource Health alerts for Azure Red Hat OpenShift | https://learn.microsoft.com/en-us/azure/openshift/howto-monitor-alerts |
89| Configure Prometheus persistent storage on ARO clusters | https://learn.microsoft.com/en-us/azure/openshift/howto-prometheus-persistence |
90| Update workload and cluster identities in Azure Red Hat OpenShift | https://learn.microsoft.com/en-us/azure/openshift/howto-replace-cluster-identity |
91| Segregate ARO worker nodes into subnet groups | https://learn.microsoft.com/en-us/azure/openshift/howto-segregate-machinesets |
92| Configure Azure Spot VMs in ARO clusters | https://learn.microsoft.com/en-us/azure/openshift/howto-spot-nodes |
93| Tag ARO managed resources using Azure Policy | https://learn.microsoft.com/en-us/azure/openshift/howto-tag-resources |
94
95### Integrations & Coding Patterns
96| Topic | URL |
97|-------|-----|
98| Run NVIDIA GPU workloads on Azure Red Hat OpenShift | https://learn.microsoft.com/en-us/azure/openshift/howto-gpu-workloads |
99| Configure Azure NetApp Files storage for ARO | https://learn.microsoft.com/en-us/azure/openshift/howto-netapp-files |
100| Send ARO Prometheus metrics to Azure Monitor via remote write | https://learn.microsoft.com/en-us/azure/openshift/howto-remotewrite-prometheus |
101| Integrate Azure Container Registry with Azure Red Hat OpenShift | https://learn.microsoft.com/en-us/azure/openshift/howto-use-acr-with-aro |
102| Integrate Azure Key Vault secrets with Azure Red Hat OpenShift | https://learn.microsoft.com/en-us/azure/openshift/howto-use-key-vault-secrets |
103
104### Deployment
105| Topic | URL |
106|-------|-----|
107| Back up Azure Red Hat OpenShift apps with Velero | https://learn.microsoft.com/en-us/azure/openshift/howto-create-a-backup |
108| Restore Azure Red Hat OpenShift apps with Velero | https://learn.microsoft.com/en-us/azure/openshift/howto-create-a-restore |
109| Create private Azure Red Hat OpenShift 4 clusters | https://learn.microsoft.com/en-us/azure/openshift/howto-create-private-cluster-4x |
110| Deploy WebSphere Liberty on Azure Red Hat OpenShift | https://learn.microsoft.com/en-us/azure/openshift/howto-deploy-java-liberty-app |
111| Deploy applications from source to ARO using S2I | https://learn.microsoft.com/en-us/azure/openshift/howto-deploy-with-s2i |
112| Deploy serverless applications on Azure Red Hat OpenShift | https://learn.microsoft.com/en-us/azure/openshift/howto-deploy-with-serverless |
113| Migrate ARO networking from OpenShift SDN to OVN-Kubernetes | https://learn.microsoft.com/en-us/azure/openshift/howto-sdn-to-ovn |
114| Deploy ARO clusters using ARM or Bicep templates | https://learn.microsoft.com/en-us/azure/openshift/quickstart-openshift-arm-bicep-template |
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