---
id: "azure-arc"
type: "component"
kind: "coordination-service"
provider: "azure"
category: "ops"
docs: "https://learn.microsoft.com/en-us/azure/azure-arc/overview"
url: "https://localhost:3000/catalogue/components/azure-arc"
---

# Azure Arc

Control plane projecting non-Azure servers, clusters and databases into Azure Resource Manager.

| | |
|---|---|
| Provider | [azure](https://localhost:3000/catalogue?provider=azure) |
| Kind | [Coordination service](https://localhost:3000/catalogue/kinds/coordination-service) |
| Category | Operations |
| Official docs | [https://learn.microsoft.com/en-us/azure/azure-arc/overview](https://learn.microsoft.com/en-us/azure/azure-arc/overview) |

## Properties

| property | type | values | required | kind default | this component |
|---|---|---|---|---|---|
| `consensus` | enum | `none`, `raft`, `paxos`, `zab` | no | "none" | inherited |
| `controlPlaneFree` | boolean | — | no | true | inherited |
| `extensions` | boolean | — | no | true | inherited |
| `managed` | boolean | — | no | false | **true** |
| `nodes` | integer | — | no | — | inherited |
| `policyGovernance` | boolean | — | no | true | inherited |
| `replicated` | boolean | — | no | false | inherited |
| `resourceType` | enum | `servers`, `kubernetes`, `data-services`, `sql-server`, `vmware-vsphere`, `scvmm` | no | — | inherited |
| `role` | enum | `metadata`, `lock`, `discovery`, `placement`, `sharding`, `leader-election`, `config` | yes | — | **"metadata"** |

Bold values are the ones this component pins.

## Rules that apply · 2

### Shared dependency without redundancy `shared-dependency-without-redundancy` (error)

- Page: https://localhost:3000/catalogue/rules/shared-dependency-without-redundancy.md
- Why: The design requires redundant discovery, but this DNS or coordination service, which everything depends on, runs on a single provider or a single replica. Its failure is the whole system's failure.
- Applies to: every node of kind dns or coordination-service
- Message: Shared dependency '{{node.id}}' is not redundant, but the design requires redundant discovery.

It fires when:

- all of these hold:
  - the design requirement `availability.discoveryRedundant` is true
  - any of these hold:
    - the node's `redundantProviders` is false
    - the node's `replicated` is false

### Stateful engine pinned to a single zone `stateful-engine-pinned-to-single-zone` (error)

- Page: https://localhost:3000/catalogue/rules/stateful-engine-pinned-to-single-zone.md
- Why: A matching engine, coordination service or event store living in exactly one availability zone, with no failover and no replication, is lost with that zone. Everything that depends on it stops with it.
- Applies to: every node of kind matching-engine, coordination-service or event-store
- Message: '{{node.id}}' is pinned to a single availability zone with no failover or replication.

It fires when:

- all of these hold:
  - the node sits inside exactly 1 availability-zone group
  - any of these hold:
    - the node's `failover` is "none"
    - the node's `replicated` is false
    - the node's `replication` is "none"

## Other products of the same kind · 17

- [Microservices Engine](https://localhost:3000/catalogue/components/alibaba-mse.md) `alibaba-mse` — alibabacloud
- [AWS Cloud Map](https://localhost:3000/catalogue/components/aws-cloud-map.md) `aws-cloud-map` — aws
- [Azure Device Registry](https://localhost:3000/catalogue/components/azure-device-registry.md) `azure-device-registry` — azure
- [Durable Objects](https://localhost:3000/catalogue/components/cloudflare-durable-objects.md) `cloudflare-durable-objects` — cloudflare
- [Apache Helix](https://localhost:3000/catalogue/components/apache-helix.md) `apache-helix` — default
- [Consul](https://localhost:3000/catalogue/components/consul.md) `consul` — default
- [Generic coordination service](https://localhost:3000/catalogue/components/coordination-service.md) `coordination-service` — default
- [etcd](https://localhost:3000/catalogue/components/etcd.md) `etcd` — default
- [Eureka](https://localhost:3000/catalogue/components/eureka.md) `eureka` — default
- [Nacos](https://localhost:3000/catalogue/components/nacos.md) `nacos` — default
- [Oxia](https://localhost:3000/catalogue/components/oxia.md) `oxia` — default
- [Apache ZooKeeper](https://localhost:3000/catalogue/components/zookeeper.md) `zookeeper` — default
- [Service Directory](https://localhost:3000/catalogue/components/google-service-directory.md) `google-service-directory` — gcp
- [Endpoints](https://localhost:3000/catalogue/components/k8s-endpoints.md) `k8s-endpoints` — k8s
- [OpenStack Blazar](https://localhost:3000/catalogue/components/openstack-blazar.md) `openstack-blazar` — openstack
- [OpenStack Cyborg](https://localhost:3000/catalogue/components/openstack-cyborg.md) `openstack-cyborg` — openstack
- [OpenStack Placement](https://localhost:3000/catalogue/components/openstack-placement.md) `openstack-placement` — openstack

## Use it in a design

```yaml
nodes:
  - { id: "azure-arc", component: "azure-arc" }
```

## Source (`component` YAML, verbatim)

```yaml
# yaml-language-server: $schema=../../schema/component.schema.json
# Azure Arc: projects non-Azure servers, Kubernetes clusters, SQL Server and data services into
# Azure Resource Manager so they carry Azure RBAC, tags and Azure Policy. "Azure Arc overview": the
# control plane (management groups and tags, Resource Graph, RBAC, templates and extensions) is
# offered at no extra cost, and indirectly connected mode was retired in September 2025.
schemaVersion: "1"
type: "component"
id: "azure-arc"
kind: "coordination-service"
provider: "azure"
docs: "https://learn.microsoft.com/en-us/azure/azure-arc/overview"
defaults:
  managed: true
  role: "metadata"
properties:
  resourceType:
    type: "enum"
    values: ["servers", "kubernetes", "data-services", "sql-server", "vmware-vsphere", "scvmm"]
  controlPlaneFree:
    type: "boolean"
    default: true
  policyGovernance:
    type: "boolean"
    default: true
  extensions:
    type: "boolean"
    default: true
```

Human page: https://localhost:3000/catalogue/components/azure-arc