> ## Documentation Index > Fetch the complete documentation index at: https://www.ravion.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # List sandbox pool hosts > Lists every EC2 instance provisioned for this environment's sandbox pool, with what each is doing right now. GET /execution-environments/{id}/sandbox-hosts… ## OpenAPI ````yaml https://api.ravion.com/openapi.yaml get /execution-environments/{id}/sandbox-hosts openapi: 3.0.0 info: title: Ravion version: 0.0.0 servers: - url: https://api.ravion.com security: - BearerAuth: [] tags: - name: Projects - name: Environments - name: FeatureFlags - name: Pipelines - name: PipelineRuns - name: TerraformResources - name: TerraformExecutionSummaries - name: PipelineStepExecutions - name: AwsCloudWatch - name: PipelineVersions - name: Organizations - name: Stacks - name: StackWorkspaces - name: Auth - name: OAuth - name: User - name: Health - name: Memberships - name: ServiceAccounts - name: AwsDefaultNetworks - name: AwsAccounts - name: ApiKeys - name: AwsAmp - name: EksPrometheus - name: EksLoki - name: ExecutionEnvironments - name: ModuleDefinitions - name: ModuleCategories - name: ModuleVersions - name: ModuleInstances - name: DefaultValueDefinitions - name: DefaultValues - name: CodeSources - name: Github - name: Gitlab - name: Git - name: Values - name: Deployments - name: DeploymentResources - name: InfrastructureEvents - name: WebSocket - name: Domains - name: AcmCertificates - name: Describe - name: Reports - name: BillingPlans - name: BillingAccounts - name: BillingCycles - name: BillingUsageSummaries - name: BillingAddOns - name: BillingInvoices paths: /execution-environments/{id}/sandbox-hosts: get: tags: - ExecutionEnvironments summary: List sandbox pool hosts description: >- Lists every EC2 instance provisioned for this environment's sandbox pool, with what each is doing right now. operationId: ListExecutionEnvironmentSandboxHosts parameters: - in: path name: id required: true schema: type: string responses: '200': content: application/json: schema: additionalProperties: false properties: data: items: $ref: '#/components/schemas/ExecutionEnvironmentSandboxHost' type: array required: - data type: object description: The request has succeeded. '400': content: application/json: schema: $ref: '#/components/schemas/Errors.UserFacingErrorData' description: The request is invalid or malformed. '401': content: application/json: schema: $ref: '#/components/schemas/Errors.UserFacingErrorData' description: You are not authenticated '403': content: application/json: schema: $ref: '#/components/schemas/Errors.UserFacingErrorData' description: You do not have permission to access this resource. '404': content: application/json: schema: $ref: '#/components/schemas/Errors.UserFacingErrorData' description: The server cannot find the requested resource. '500': content: application/json: schema: $ref: '#/components/schemas/Errors.UserFacingErrorData' description: Server error components: schemas: ExecutionEnvironmentSandboxHost: additionalProperties: false description: One EC2 instance provisioned for this environment's sandbox pool. properties: availabilityZone: description: Availability zone the host runs in. type: string id: description: >- The EC2 instance id, which is also the host's id in every log line about it. type: string instanceType: description: EC2 instance type the host runs on. type: string lastUsedAt: description: >- When the host last finished a sandbox. Absent on a host that has not run one yet. format: date-time type: string launchedAt: description: When the instance was launched. format: date-time type: string live: $ref: '#/components/schemas/ExecutionEnvironmentSandboxHostLiveState' parkedAt: description: When the host was parked. Absent while it is running. format: date-time type: string state: description: >- `RUNNING` is a host that is up and takes work. `PARKED` is a host that was stopped after its idle timer: it keeps its volume and its next step wakes it in seconds. enum: - RUNNING - PARKED type: string required: - id - instanceType - availabilityZone - state - launchedAt - live type: object Errors.UserFacingErrorData: additionalProperties: false description: |- User-facing error presentation data. This is what the API returns to the frontend after formatting ErrorData using CEL templates from the error registry. Used for both: - Error fields on domain models (e.g., PipelineRun.error) - API error response bodies (HTTP 4xx/5xx responses) properties: action: allOf: - $ref: '#/components/schemas/Errors.Action' description: Optional action to help resolve the error code: description: Full error code, e.g., "Ravion:Pipeline:NOT_FOUND" type: string description: description: Additional description with more details type: string details: description: Structured details rendered as user-facing sections. items: $ref: '#/components/schemas/Errors.UserFacingErrorDetailSection' type: array isInternal: description: >- Indicates whether this error is internal (only set when ShowInternal=true). This allows SUPERADMINs to identify internal errors while viewing full details. type: boolean message: description: Main error message (required) type: string metadata: additionalProperties: {} description: >- Error params/metadata. Stripped for internal errors unless superadmin. type: object requestId: description: Request ID for correlating errors with server logs. type: string required: - code - message type: object ExecutionEnvironmentSandboxHostLiveState: additionalProperties: false description: >- What one host of the pool is doing right now, as the host's own agent last reported it. A host the control plane holds no connection to reports `connected: false` and zeroes: it may be parked, rebooting, or gone. properties: connected: description: Whether a Ravion API replica currently holds this host's connection. type: boolean cpuCapacity: description: vCPUs the host has in total. format: int32 type: integer cpuUsed: description: vCPUs the running sandboxes hold. format: int32 type: integer freeDiskMiB: description: >- Free space left on the host's root volume, in MiB. Sandboxes write their overlays there, so a host low on it takes no more work. format: int64 type: integer memoryCapacityMiB: description: Memory the host can give its sandboxes in total, in MiB. format: int64 type: integer memoryUsedMiB: description: Memory the running sandboxes hold, in MiB. format: int64 type: integer sandboxCount: description: How many sandboxes are running on the host. format: int32 type: integer required: - connected - sandboxCount - cpuUsed - cpuCapacity - memoryUsedMiB - memoryCapacityMiB - freeDiskMiB type: object Errors.Action: additionalProperties: false description: Action to help user resolve the error properties: label: description: Button/link label text type: string url: description: URL to navigate to for resolution type: string required: - label - url type: object Errors.UserFacingErrorDetailSection: additionalProperties: false description: Structured user-facing error detail section. properties: items: description: List of detail values for this section. items: type: string type: array object: additionalProperties: {} description: Structured detail payload for object rendering. type: object render: description: Rendering hint for clients. Valid values are list or object. type: string title: description: Detail section title shown in the UI. type: string required: - title - render type: object securitySchemes: BearerAuth: scheme: Bearer type: http ````