> ## Documentation Index > Fetch the complete documentation index at: https://docs.ankra.ai/llms.txt > Use this file to discover all available pages before exploring further. # Update Upcloud Zone Pool > Extend an UpCloud cluster's zone pool. Zones can only be added; the cluster must run network_mode 'wireguard_mesh' and the grown pool must keep at least 3 zones with at least 3 control planes. Every new zone gets its own router, private network and NAT gateway; day-2 growth then spreads across the pool. Answers 404 while the organisation's network_overlay feature flag is off. ## OpenAPI ````yaml https://platform.ankra.app/openapi.json put /api/v1/clusters/upcloud/{cluster_id}/zones openapi: 3.1.0 info: title: FastAPI version: 0.1.0 servers: - url: https://platform.ankra.app security: [] tags: - name: Clusters description: Create, inspect and manage clusters, and the stacks deployed on them. - name: Managed Clusters description: Provider-managed control planes, driven through one common surface. - name: Imported Clusters description: Clusters that already existed and were connected to Ankra. - name: Cluster Access description: Kubeconfigs, service-account tokens and per-cluster access grants. - name: Kubernetes description: Read and act on the Kubernetes objects inside a cluster. - name: DigitalOcean Clusters description: Provision and manage DigitalOcean Kubernetes clusters. - name: Hetzner Clusters description: Provision and manage Hetzner Kubernetes clusters. - name: OVH Clusters description: Provision and manage OVH Kubernetes clusters. - name: Scaleway Clusters description: Provision and manage Scaleway Kapsule clusters. - name: UpCloud Clusters description: Provision and manage UpCloud Kubernetes clusters. - name: Applications description: Deploy, configure and observe applications across the fleet. - name: Stack Profiles description: Reusable stack definitions, their versions and sharing. - name: Charts description: Browse the chart catalogue behind stacks and addons. - name: Helm description: Helm registries, credentials and the charts they expose. - name: Executions description: Long-running platform executions and their jobs. - name: Operations description: Cancel in-flight cluster operations and their jobs. - name: Chat description: Conversational sessions, plans and confirmable actions. - name: AI Agent Runs description: Autonomous agent runs and their outcomes. - name: AI Tickets description: The AI ticket board, its sync connections and settings. - name: AI Playbooks description: Reusable playbooks the AI lanes execute. - name: AI Conditions description: Conditions that gate AI autonomy. - name: AI Engineering Handoffs description: Work the AI lanes escalate to a human engineer. - name: AI Environment description: The environment and base stacks AI demos deploy into. - name: Security description: Findings, advisories, SBOMs, compliance and posture. - name: Cost description: Cluster and fleet cost, rate cards and cost settings. - name: Billing description: Subscription and spend caps. - name: Organisation description: Members, invitations, audit logs and organisation settings. - name: Account Tokens description: Personal access tokens for the API and CLI. - name: Credentials description: The shared credential store. - name: Azure Credentials description: Azure credentials and SSH keys. - name: DigitalOcean Credentials description: DigitalOcean credentials and SSH keys. - name: Hetzner Credentials description: Hetzner credentials and SSH keys. - name: OVH Credentials description: OVH credentials and SSH keys. - name: Scaleway Credentials description: Scaleway credentials. - name: UpCloud Credentials description: UpCloud credentials and SSH keys. - name: Data Source Credentials description: Credentials for metrics and log sources. - name: DNS Credentials description: Credentials for DNS providers. - name: DNS description: DNS zones and records, including custom organisation zones. - name: Cloudflare description: Cloudflare domains and the credentials behind them. - name: Variables description: Organisation- and cluster-scoped variables. - name: SOPS description: Encrypt and decrypt values with the organisation SOPS config. - name: Alerts description: Alert integrations and ingest credentials. - name: Notifications description: Notification routes and their delivery targets. - name: Support description: Support tickets. paths: /api/v1/clusters/upcloud/{cluster_id}/zones: put: tags: - UpCloud Clusters summary: Update Upcloud Zone Pool description: >- Extend an UpCloud cluster's zone pool. Zones can only be added; the cluster must run network_mode 'wireguard_mesh' and the grown pool must keep at least 3 zones with at least 3 control planes. Every new zone gets its own router, private network and NAT gateway; day-2 growth then spreads across the pool. Answers 404 while the organisation's network_overlay feature flag is off. operationId: update_upcloud_zone_pool_api_v1_clusters_upcloud__cluster_id__zones_put parameters: - in: path name: cluster_id required: true schema: format: uuid title: Cluster Id type: string - in: query name: wait required: false schema: default: false title: Wait type: boolean - in: header name: authorization required: false schema: anyOf: - type: string - type: 'null' title: Authorization - in: header name: x-ankra-organisation-id required: false schema: anyOf: - type: string - type: 'null' title: X-Ankra-Organisation-Id requestBody: content: application/json: schema: $ref: '#/components/schemas/UpdateUpcloudZonePoolRequest' required: true responses: '200': content: application/json: schema: $ref: '#/components/schemas/UpdateUpcloudZonePoolResult' description: Successful Response '401': description: Unauthorized '404': description: Not found '409': content: application/json: schema: $ref: '#/components/schemas/ContractDetailError' description: Conflicting or unsafe lifecycle state '422': content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' description: Validation Error components: schemas: UpdateUpcloudZonePoolRequest: properties: zones: description: >- The desired zone pool, primary zone first. Every current zone must still be listed; new zones are appended in the given order. items: type: string title: Zones type: array required: - zones title: UpdateUpcloudZonePoolRequest type: object UpdateUpcloudZonePoolResult: properties: added_zones: items: type: string title: Added Zones type: array zones: items: type: string title: Zones type: array required: - zones - added_zones title: UpdateUpcloudZonePoolResult type: object ContractDetailError: example: detail: Cluster not found properties: detail: oneOf: - type: string - additionalProperties: true properties: {} type: object required: - detail type: object HTTPValidationError: properties: detail: items: $ref: '#/components/schemas/ValidationError' title: Detail type: array title: HTTPValidationError type: object ValidationError: properties: loc: items: anyOf: - type: string - type: integer title: Location type: array msg: title: Message type: string type: title: Error Type type: string required: - loc - msg - type title: ValidationError type: object ````