Describe Azure Arc enabled Kubernetes
Contoso hosts Kubernetes clusters in multiple datacenters throughout the world. IT staff at Contoso want to manage these disparate clusters using consistent tools and processes. Azure Arc gives the IT staff a single pane of glass and single toolset for managing the clusters.
What is Azure Arc enabled Kubernetes?
Using Azure Arc, you can connect Kubernetes clusters located anywhere to Azure and then manage the clusters in a consistent way. Azure Arc enabled Kubernetes lets you control the cluster configuration and workloads at scale using your git repositories as the source of truth for the clusters. It also lets you use with your clusters the extensive management capabilities in Azure for common management needs such as inventory, monitoring, policy compliance, security, user access, and more.
This is true for Kubernetes clusters located anywhere: on-premises or in any cloud provider.
When you implement Azure Arc you can then start to use many Azure services to manage your clusters; these include (among others):
- Azure portal
- Azure Resource Graph
- Azure Policy
- Azure Monitor
Each Kubernetes cluster you enable with Azure Arc:
- Is assigned an Azure Resource Manager ID.
- Has a managed identity.
- Is located in an Azure resource group and subscription.
- Appears in the Azure portal.
- Can be treated like other Azure resources; for example it can be tagged for inventory management.
At minimum, you can implement Azure Arc in your Kubernetes clusters to view the inventory of your complete Kubernetes estate, and then group and tag the clusters for finer-grained inventory management. In addition, you can use:
- GitOps-based configuration management to deploy applications and configure the clusters.
- Azure Policy for Kubernetes to enforce run-time policies in your Kubernetes clusters.
- Azure Monitor for containers to consistently monitor all of your clusters.
What can you do with Azure Arc enabled Kubernetes?
You can use Azure Arc enabled Kubernetes to address many requirements in your organization. These include:
- Provide unified management and administration tools.
- Perform configuration with integrated management.
- Collect inventory data.
Provide unified management and administration tools
With Azure Arc enabled Kubernetes, you can create a shared application and infrastructure environment. This approach enables you to implement:
- Consistent management of your resources using the Azure portal and APIs across:
- Your datacenters
- Edge locations
- Multiple hosting providers
- A shared management and administration view, enabling you to manage Kubernetes clusters as well as Windows Server and Linux VMs, physical servers, and Azure data services.
- Clear roles and responsibilities for your IT and engineering staff, providing role separation while still maintaining visibility and access to resources, wherever their location.
Perform configuration with integrated management
Use Azure Arc enabled Kubernetes integrated management to more efficiently create, apply, and enforce policies to Kubernetes apps, data, and infrastructure, wherever those resources are located. Specifically, you can:
- Use Azure Policy to:
- Assure consistent configurations across all your Kubernetes clusters.
- Enforce run-time conformance and audit resources.
- Implement role-based access control (RBAC) across systems and different types of resources to help to standardize security.
- Automate and delegate remediation of incidents and problems to service teams.
- Implement additional Azure services and leverage your choice of Azure tools to:
- Integrate with Azure Monitor, Security Center, GitHub, and others.
- Automate configuration and infrastructure as code to provide repeatable deployments using templates.
- Provide end-to-end identity for your users and your resources with Azure Resource Manager and Azure Active Directory (Azure AD).
Collect inventory data
By implementing Azure Arc enabled Kubernetes, you can more efficiently collect inventory data by:
- Unifying your resources so you can organize and inventory by using Azure scopes, such as:
- Management groups
- Resource Groups
- Tracking resources by creating and applying standardized and custom tags.
- Searching your global resources with Azure Resource Graph.
Azure Arc enabled Kubernetes agents
Similar to the way that you onboard servers to Azure Arc, you must also deploy agents to your Kubernetes clusters. The Kubernetes agents are responsible for:
- Connecting to Azure.
- Collecting Azure Arc logs and metrics.
- Managing configuration requests.
Azure Arc enabled Kubernetes deploys several agents.
These agents run in the
azure-arc namespace in your Kubernetes clusters.
The following table describes these agents.
||Monitors the connected cluster for updates, compliance state, and source control configuration resources applied on the cluster.|
||Orchestrates interactions between Azure Arc components.|
||Collects metrics from other Azure Arc agents to optimize the performance of these other agents.|
||Gathers cluster metadata, including cluster version, node count, and Azure Arc agent version.|
||Syncs cluster metadata to Azure.|
||Maintains the certificate for the managed identities for Azure resources that other agents use for communication with Azure.|
||Collects logs from the flux operators that deploy as a part of source control configuration.|