Envoy Listeners API

openapi: 3.2.0
info:
  title: Envoy Admin Listeners API
  description: The Envoy Admin API provides local administrative access to a running Envoy proxy instance. It exposes endpoints for inspecting configuration, checking health, viewing statistics, managing log levels, and controlling the runtime state of the proxy. The Admin API is typically bound to a local interface (default port 9901) and is not intended for external exposure in production environments.
  version: 1.31.0
  contact:
    name: Envoy Proxy Community
    url: https://www.envoyproxy.io/community
  termsOfService: https://www.envoyproxy.io/
servers:
- url: http://localhost:9901
  description: Default Envoy Admin Interface
tags:
- name: Listeners
  description: Listener inspection and drain endpoints
paths:
  /listeners:
    get:
      operationId: getListeners
      summary: Envoy Get listener information
      description: Returns information about all configured listeners including their names, bound addresses and ports, and associated statistics. Supports JSON or text output format.
      tags:
      - Listeners
      parameters:
      - $ref: '#/components/parameters/FormatParam'
      responses:
        '200':
          description: Listener information retrieved successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ListenersResponse'
            text/plain:
              schema:
                type: string
  /drain_listeners:
    post:
      operationId: drainListeners
      summary: Envoy Drain listeners
      description: Initiates graceful draining of all listeners, stopping new connections from being accepted while allowing existing connections to complete. Useful before shutting down an Envoy instance or removing it from a load balancer.
      tags:
      - Listeners
      parameters:
      - name: inboundonly
        in: query
        description: When true, only drain inbound listeners.
        required: false
        schema:
          type: boolean
          default: false
      - name: graceful
        in: query
        description: When true, perform a graceful drain that allows time for connections to complete.
        required: false
        schema:
          type: boolean
          default: false
      responses:
        '200':
          description: Listener drain initiated
          content:
            text/plain:
              schema:
                type: string
components:
  schemas:
    ListenersResponse:
      type: object
      description: Information about all configured listeners
      properties:
        listener_statuses:
          type: array
          description: List of listener status objects
          items:
            type: object
            properties:
              name:
                type: string
                description: Listener name
              local_address:
                type: object
                description: Address this listener is bound to
                properties:
                  socket_address:
                    type: object
                    properties:
                      address:
                        type: string
                        description: IP address or hostname
                      port_value:
                        type: integer
                        description: Port number
              additional_local_addresses:
                type: array
                description: Additional addresses this listener is bound to
                items:
                  type: object
  parameters:
    FormatParam:
      name: format
      in: query
      description: Output format for the response data.
      required: false
      schema:
        type: string
        enum:
        - json
        - text
        default: text
externalDocs:
  description: Envoy Admin Interface Documentation
  url: https://www.envoyproxy.io/docs/envoy/latest/operations/admin