> ## Documentation Index > Fetch the complete documentation index at: https://gcore.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Attach interface > Attach interface to instance ## OpenAPI ````yaml /api-reference/services_documented/cloud_api.yaml post /cloud/v1/instances/{project_id}/{region_id}/{instance_id}/attach_interface openapi: 3.1.0 info: title: Gcore OpenAPI – Cloud API description: >- This OpenAPI is an aggregated OpenAPI specification that unifies all Gcore products into a single file. It covers Cloud, CDN, DNS, WAAP, DDoS Protection, Object Storage, Streaming, and FastEdge services. version: '2026-05-14T07:00:22.640261+00:00' servers: - url: https://api.gcore.com security: - APIKey: [] tags: - name: Bare Metal x-displayName: Bare Metal - name: Container as a Service x-displayName: Container as a Service - name: Cost Reports x-displayName: Cost Reports - name: DDoS Protection x-displayName: DDoS Protection - name: Everywhere Inference x-displayName: Everywhere Inference - name: Everywhere Inference Apps x-displayName: Everywhere Inference Apps - name: File Shares x-displayName: File Shares - name: Floating IPs x-displayName: Floating IPs - name: Function as a Service x-displayName: Function as a Service - name: GPU Bare Metal x-displayName: GPU Bare Metal - name: GPU Virtual x-displayName: GPU Virtual - name: IP Ranges x-displayName: IP Ranges - name: Images x-displayName: Images - name: Instances x-displayName: Instances - name: Load Balancers x-displayName: Load Balancers - name: Logging x-displayName: Logging - name: Managed Kubernetes x-displayName: Managed Kubernetes - name: Managed PostgreSQL x-displayName: Managed PostgreSQL - name: Networks x-displayName: Networks - name: Placement Groups x-displayName: Placement Groups - name: Projects x-displayName: Projects - name: Quotas x-displayName: Quotas - name: Regions x-displayName: Regions - name: Registry x-displayName: Registry - name: Reservations x-displayName: Reservations - name: Reserved IPs x-displayName: Reserved IPs - name: Routers x-displayName: Routers - name: SSH Keys x-displayName: SSH Keys - name: Secrets x-displayName: Secrets - name: Security Groups x-displayName: Security Groups - name: Snapshot Schedules x-displayName: Snapshot Schedules - name: Snapshots x-displayName: Snapshots - name: Tasks x-displayName: Tasks - name: User Actions x-displayName: User Actions - name: User Role Assignments x-displayName: User Role Assignments - name: Volumes x-displayName: Volumes paths: /cloud/v1/instances/{project_id}/{region_id}/{instance_id}/attach_interface: post: tags: - Instances summary: Attach interface description: Attach interface to instance operationId: AttachInterfaceHandler.post parameters: - in: path name: project_id required: true description: Project ID schema: type: integer - in: path name: region_id required: true description: Region ID schema: type: integer - in: path name: instance_id required: true description: Instance ID schema: type: string requestBody: content: application/json: schema: oneOf: - $ref: >- #/components/schemas/NewInterfaceExternalExtendSchemaWithDdos - $ref: '#/components/schemas/NewInterfaceSpecificSubnetSchema' - $ref: '#/components/schemas/NewInterfaceAnySubnetSchema' - $ref: '#/components/schemas/NewInterfaceReservedFixedIpSchema' discriminator: propertyName: type mapping: external: $ref: >- #/components/schemas/NewInterfaceExternalExtendSchemaWithDdos subnet: $ref: '#/components/schemas/NewInterfaceSpecificSubnetSchema' any_subnet: $ref: '#/components/schemas/NewInterfaceAnySubnetSchema' reserved_fixed_ip: $ref: '#/components/schemas/NewInterfaceReservedFixedIpSchema' responses: '200': description: Created task content: application/json: schema: $ref: '#/components/schemas/TaskIDsSerializer' x-codeSamples: - lang: Python source: |- import os from gcore import Gcore client = Gcore( api_key=os.environ.get("GCORE_API_KEY"), # This is the default and can be omitted ) task_id_list = client.cloud.instances.interfaces.attach( instance_id="instance_id", project_id=0, region_id=0, ) print(task_id_list.tasks) - lang: Go source: "package main\n\nimport (\n\t\"context\"\n\t\"fmt\"\n\n\t\"github.com/G-Core/gcore-go\"\n\t\"github.com/G-Core/gcore-go/cloud\"\n\t\"github.com/G-Core/gcore-go/option\"\n)\n\nfunc main() {\n\tclient := gcore.NewClient(\n\t\toption.WithAPIKey(\"My API Key\"),\n\t)\n\ttaskIDList, err := client.Cloud.Instances.Interfaces.Attach(\n\t\tcontext.TODO(),\n\t\t\"instance_id\",\n\t\tcloud.InstanceInterfaceAttachParams{\n\t\t\tProjectID: gcore.Int(0),\n\t\t\tRegionID: gcore.Int(0),\n\t\t\tOfNewInterfaceExternalExtendSchemaWithDDOS: &cloud.InstanceInterfaceAttachParamsBodyNewInterfaceExternalExtendSchemaWithDDOS{\n\t\t\t\tType: gcore.String(\"external\"),\n\t\t\t},\n\t\t},\n\t)\n\tif err != nil {\n\t\tpanic(err.Error())\n\t}\n\tfmt.Printf(\"%+v\\n\", taskIDList.Tasks)\n}\n" components: schemas: NewInterfaceExternalExtendSchemaWithDdos: type: object properties: ddos_profile: type: - 'null' - object description: Advanced DDoS protection. allOf: - $ref: '#/components/schemas/DeprecatedCreateDdosProfileSchema' interface_name: type: string maxLength: 37 description: Interface name ip_family: type: string enum: - dual - ipv4 - ipv6 description: 'Which subnets should be selected: IPv4, IPv6 or use dual stack.' port_group: type: integer minimum: 0 maximum: 3 description: Each group will be added to the separate trunk. security_groups: type: array description: List of security group IDs items: $ref: '#/components/schemas/MandatoryIdSchema' type: type: string default: external description: Must be 'external'. Union tag description: Instance will be attached to default external network example: type: external ip_family: dual security_groups: - id: 4536dba1-93b1-492e-b3df-270b6b9f3650 - id: cee2ca1f-507a-4a31-b714-f6c1ffb4bdfa ddos_profile: profile_template: 29 fields: [] NewInterfaceSpecificSubnetSchema: type: object properties: ddos_profile: type: - 'null' - object description: Advanced DDoS protection. allOf: - $ref: '#/components/schemas/DeprecatedCreateDdosProfileSchema' interface_name: type: string maxLength: 37 description: Interface name port_group: type: integer minimum: 0 maximum: 3 description: Each group will be added to the separate trunk. security_groups: type: array description: List of security group IDs items: $ref: '#/components/schemas/MandatoryIdSchema' subnet_id: type: string description: Port will get an IP address from this subnet type: type: string default: subnet description: Must be 'subnet' required: - subnet_id description: Instance will be attached to specified subnet example: subnet_id: e3c6ee77-48cb-416b-b204-11b492cc776e3 type: subnet security_groups: - id: 4536dba1-93b1-492e-b3df-270b6b9f3650 - id: cee2ca1f-507a-4a31-b714-f6c1ffb4bdfa ddos_profile: profile_template: 29 fields: [] interface_name: my-subnet-interface NewInterfaceAnySubnetSchema: type: object properties: ddos_profile: type: - 'null' - object description: Advanced DDoS protection. allOf: - $ref: '#/components/schemas/DeprecatedCreateDdosProfileSchema' interface_name: type: string maxLength: 37 description: Interface name ip_family: type: string enum: - dual - ipv4 - ipv6 description: 'Which subnets should be selected: IPv4, IPv6 or use dual stack.' network_id: type: string description: Port will get an IP address in this network subnet port_group: type: integer minimum: 0 maximum: 3 description: Each group will be added to the separate trunk. security_groups: type: array description: List of security group IDs items: $ref: '#/components/schemas/MandatoryIdSchema' type: type: string default: any_subnet description: Must be 'any_subnet' required: - network_id description: >- Instance will be attached to the network subnet with the largest count of available ips example: network_id: e3c6ee77-48cb-416b-b204-11b492cc776e3 type: any_subnet security_groups: - id: 4536dba1-93b1-492e-b3df-270b6b9f3650 - id: cee2ca1f-507a-4a31-b714-f6c1ffb4bdfa profile_template: 29 fields: [] interface_name: my-any-subnet-interface NewInterfaceReservedFixedIpSchema: type: object properties: ddos_profile: type: - 'null' - object description: Advanced DDoS protection. allOf: - $ref: '#/components/schemas/DeprecatedCreateDdosProfileSchema' interface_name: type: string maxLength: 37 description: Interface name port_group: type: integer minimum: 0 maximum: 3 description: Each group will be added to the separate trunk. port_id: type: string description: Port ID security_groups: type: array description: List of security group IDs items: $ref: '#/components/schemas/MandatoryIdSchema' type: type: string default: reserved_fixed_ip description: Must be 'reserved_fixed_ip'. Union tag required: - port_id description: |- Instance will be attached to the given port. Floating IP will be created and attached to that IP example: port_id: 59905c8e-2619-420a-b046-536096473370 type: reserved_fixed_ip security_groups: - id: 4536dba1-93b1-492e-b3df-270b6b9f3650 - id: cee2ca1f-507a-4a31-b714-f6c1ffb4bdfa ddos_profile: profile_template: 29 fields: [] interface_name: my-rfip-interface TaskIDsSerializer: properties: tasks: description: >- List of task IDs representing asynchronous operations. Use these IDs to monitor operation progress: - `GET /v1/tasks/{task_id}` - Check individual task status and details Poll task status until completion (`FINISHED`/`ERROR`) before proceeding with dependent operations. example: - d478ae29-dedc-4869-82f0-96104425f565 examples: - - d478ae29-dedc-4869-82f0-96104425f565 items: type: string title: Tasks type: array required: - tasks title: TaskIDsSerializer type: object DeprecatedCreateDdosProfileSchema: type: object properties: fields: type: array default: [] writeOnly: true description: Protection parameters. items: $ref: '#/components/schemas/DeprecatedCreateClientProfileFieldSchema' profile_template: type: integer writeOnly: true description: DDoS profile template ID. profile_template_name: type: string writeOnly: true description: DDoS profile template name. required: - profile_template example: profile_template: 29 fields: [] MandatoryIdSchema: type: object properties: id: type: string format: uuid description: Resource ID required: - id description: MandatoryIdSchema schema example: id: ae74714c-c380-48b4-87f8-758d656cdad6 DeprecatedCreateClientProfileFieldSchema: type: object properties: base_field: type: integer writeOnly: true description: ID of DDoS profile field field_value: writeOnly: true description: Complex value for the DDoS profile field value: type: - string - 'null' writeOnly: true maxLength: 500 description: >- Basic type value. Only one of 'value' or 'field_value' must be specified. required: - base_field example: field_value: - 45046 - 45047 base_field: 10 securitySchemes: APIKey: description: >- API key for authentication. Make sure to include the word `apikey`, followed by a single space and then your token. Example: `apikey 1234$abcdef` type: apiKey in: header name: Authorization ````