> ## Documentation Index > Fetch the complete documentation index at: https://docs.domino.ai/llms.txt > Use this file to discover all available pages before exploring further. # Create App Version and Start (v1) > Compound endpoint that creates a new version and initiates a run of it in a single request. The version is always persisted; if the start initiation fails the response still returns the persisted version with a `warnings` array describing the failure and the caller can retry via the regular start endpoint. Stop-previous: if a different version of the same App is already running, it is stopped before the new version starts (uniform one-running-instance-per-App invariant; not draft-specific). Draft-specific defaulting: when the parent App is a draft AND a previous running version exists on it, omitted content reference fields (`dfsCommitId`, `gitRef`, `entryScript`, `environmentId`, `environmentRevisionId`, `hardwareTierId`, `externalVolumeMountIds`, `netAppVolumeIds`) default to the previous running version's values. On the very first call (no previous running version) all required content fields must be supplied. Governance only starts when a draft is published. ## OpenAPI ````yaml /api-specs/cloud/public-api.yaml post /api/apps/v1/apps/{appId}/versions/createAndStart openapi: 3.0.3 info: title: Domino Public API description: Domino Public API Endpoints version: cloud servers: [] security: - DominoApiKey: [] - BearerAuthentication: [] tags: - name: AIGateway - name: AppInstances - name: AppVersions - name: Apps - name: AsyncPredictions - name: AuditTrail - name: BillingTag - name: BillingTagSettings - name: Cost - name: CustomMetrics - name: DataSource - name: DatasetRw - name: DeploymentTargets - name: Environments - name: Extensions - name: GenAI - name: HardwareTier - name: Jobs - name: ModelAPI - name: ModelAPIVersion - name: ModelDeployment - name: Organizations - name: PPM - name: PersonalAccessToken - name: ProjectSharedDatasets - name: ProjectTemplates - name: Projects - name: ProjectsCommits - name: ProjectsFiles - name: RegisteredModels - name: ServiceAccounts - name: Users - name: Workspaces paths: /api/apps/v1/apps/{appId}/versions/createAndStart: post: tags: - AppVersions summary: Create App Version and Start (v1) description: > Compound endpoint that creates a new version and initiates a run of it in a single request. The version is always persisted; if the start initiation fails the response still returns the persisted version with a `warnings` array describing the failure and the caller can retry via the regular start endpoint. Stop-previous: if a different version of the same App is already running, it is stopped before the new version starts (uniform one-running-instance-per-App invariant; not draft-specific). Draft-specific defaulting: when the parent App is a draft AND a previous running version exists on it, omitted content reference fields (`dfsCommitId`, `gitRef`, `entryScript`, `environmentId`, `environmentRevisionId`, `hardwareTierId`, `externalVolumeMountIds`, `netAppVolumeIds`) default to the previous running version's values. On the very first call (no previous running version) all required content fields must be supplied. Governance only starts when a draft is published. operationId: createAndStartAppVersionV1 parameters: - in: path name: appId required: true schema: type: string requestBody: content: application/json: schema: $ref: '#/components/schemas/CreateAndStartAppVersionRequestV1' required: true responses: '201': content: application/json: schema: $ref: '#/components/schemas/AppVersionCreateAndStartResponseV1' description: >- Version persisted and start initiated. If start initiation failed, the response carries the durable version plus a `warnings` array. '400': $ref: '#/components/responses/400' '401': $ref: '#/components/responses/401' '403': $ref: '#/components/responses/403' '404': $ref: '#/components/responses/404' '422': $ref: '#/components/responses/422' '500': $ref: '#/components/responses/500' components: schemas: CreateAndStartAppVersionRequestV1: description: > Request body for POST /apps/{appId}/versions/createAndStart and the optional initialVersion sub-flow on POST /apps/drafts. Content (reproducibility) fields (commits, refs, environment, mounts) and deployment (execution) fields (hardwareTier, autoscaling) are accepted on the new version. Run-time overrides for the initiated instance (vanityUrl, autoscalingSpecification, etc.) are carried separately under `startOverrides`. Draft-specific defaulting: when the parent App is a draft AND a previous running version exists, omitted content reference fields default to the previous running version's values (commitId, mainRepoGitRef, entryScript, environmentId, environmentRevisionId, hardwareTierId, externalVolumeMountIds, netAppVolumeIds). Governance only starts when a draft is published. properties: autoscalingSpecification: $ref: '#/components/schemas/AppAutoscalingSpecification' bundleId: description: Guardrails bundle ID. Not applicable on drafts. type: string dataPlaneId: type: string description: type: string dfsCommitId: type: string entryScript: description: Effective entry point for the App version. type: string environmentId: type: string environmentRevisionId: type: string extendedIdentityPropagationToAppsEnabled: default: false type: boolean externalVolumeMountIds: items: type: string type: array gitRef: $ref: '#/components/schemas/GitRef' hardwareTierId: type: string mountDatasets: description: > Optional. If supplied, overrides the App's default for this version. If omitted, inherits from the parent App. type: boolean netAppVolumeIds: items: type: string type: array resolvedDfsCommitId: type: string resolvedGitCommitId: type: string resolvedImportedGitRepos: items: $ref: '#/components/schemas/ImportedGitRepoSnapshot' type: array resolvedImportedProjects: items: $ref: '#/components/schemas/ImportedProjectSnapshot' type: array startOverrides: $ref: '#/components/schemas/StartAppVersionRequestV1' description: > Optional deployment-only run-time overrides for the initiated instance (`deployment.hardwareTierId`, `deployment.autoscalingSpecification`, `deployment.vanityUrl`, `deployment.renderIFrame`). Content fields are supplied at the top level of the request body for the version snapshot. tags: items: $ref: '#/components/schemas/AppVersionTag' type: array type: object AppVersionCreateAndStartResponseV1: description: > Response body for POST /apps/{appId}/versions/createAndStart. `version` is always present (the version is durably persisted before start initiation). `instance` is populated when start initiation succeeds; if it fails the response carries the version with a `warnings` array describing the failure and the caller can retry via the regular start endpoint. properties: instance: $ref: '#/components/schemas/AppInstanceSummaryResponseV1' description: Present only when start initiation succeeded. version: $ref: '#/components/schemas/AppVersionResponseV1' warnings: description: Non-fatal warnings (e.g., start initiation failure). items: type: string type: array required: - version type: object AppAutoscalingSpecification: properties: enabled: type: boolean maxReplicas: maximum: 30 minimum: 1 type: integer minReplicas: maximum: 30 minimum: 1 type: integer scaleDownStabilizationWindowSeconds: maximum: 3600 minimum: 0 type: integer scaleUpStabilizationWindowSeconds: maximum: 3600 minimum: 0 type: integer targetCpuAvgUtilizationPct: maximum: 100 minimum: 1 type: integer targetMemoryAvgUtilizationPct: maximum: 100 minimum: 1 type: integer useSessionAffinity: type: boolean required: - enabled type: object GitRef: properties: type: enum: - head - commitId - branches - tags - custom type: string value: type: string required: - type type: object ImportedGitRepoSnapshot: properties: ref: type: string repoId: type: string repoName: type: string required: - repoId - repoName - ref type: object ImportedProjectSnapshot: properties: commitId: type: string directoryName: type: string ownerId: type: string projectId: type: string projectName: type: string release: type: string required: - projectId - projectName - ownerId - directoryName - commitId type: object StartAppVersionRequestV1: description: > Deployment overrides applied at launch. `deployment.hardwareTierId` and `deployment.autoscalingSpecification` are mirrored back to the version so it always reflects the last launch. `deployment.vanityUrl` and `deployment.renderIFrame` write back to the App on published starts and are rejected with 422 on draft starts. properties: deployment: $ref: '#/components/schemas/AppVersionDeploymentUpdate' description: | Deployment overrides for this launch. type: object AppVersionTag: properties: key: type: string value: type: string required: - key - value type: object AppInstanceSummaryResponseV1: properties: createdAt: format: epoch type: number describeUrl: type: string dfsCommitId: description: The DFS commit ID that was used for this instance's execution. type: string gitCommitId: description: The git commit SHA that was used for this instance's execution. type: string id: type: string publisher: allOf: - $ref: '#/components/schemas/AppUserResponse' description: User who started this run. nullable: true status: type: string required: - id - createdAt - status type: object AppVersionResponseV1: properties: bundle: $ref: '#/components/schemas/AppVersionBundle' content: $ref: '#/components/schemas/AppVersionContent' createdAt: format: epoch type: number currentInstance: $ref: '#/components/schemas/AppInstanceSummaryResponseV1' deployment: $ref: '#/components/schemas/AppVersionDeployment' description: type: string id: type: string tags: items: $ref: '#/components/schemas/AppVersionTag' type: array updatedAt: format: epoch type: number versionNumber: description: Monotonically increasing version number derived from creationOrder. format: int64 type: integer required: - id - createdAt - updatedAt - tags type: object FailureEnvelopeV1: properties: errors: description: Errors that caused a request to fail items: type: string type: array requestId: description: Id used to correlate a request with server actions. example: bbd78579-93c4-45ee-a983-0d5c8da6d5b1 type: string required: - requestId - errors type: object AppVersionDeploymentUpdate: description: > Execution settings for the version. All fields are optional; omitted fields fall back to App-level defaults or the previous version's values depending on context. Mirrors the response-side AppVersionDeployment shape. properties: autoscalingSpecification: $ref: '#/components/schemas/AppAutoscalingSpecification' hardwareTierId: type: string renderIFrame: description: > Deployment-field override for App-level renderIFrame. Only valid when starting a published App version: the override is written back to the App alongside launch (mirrors the vanityUrl writeback) so the value reflects the running version. Returns 422 when supplied on a draft start, since drafts rebaseline renderIFrame from the draft App on publish and any override would be silently lost. type: boolean vanityUrl: type: string type: object AppUserResponse: properties: id: type: string name: type: string required: - id - name type: object AppVersionBundle: properties: id: description: Guardrails bundle ID. Immutable after creation. type: string name: type: string type: object AppVersionContent: description: Reproducibility fields that define the version's content. properties: dataPlaneId: nullable: true type: string dfsCommitId: type: string entryScript: description: Effective entry point for the App version. type: string environmentId: type: string environmentRevisionId: type: string extendedIdentityPropagationToAppsEnabled: type: boolean externalVolumeMountIds: items: type: string type: array gitRef: $ref: '#/components/schemas/GitRef' mountDatasets: description: >- Whether to mount Domino Datasets into the App's runtime for this version. type: boolean netAppVolumeIds: items: type: string type: array resolvedCommits: $ref: '#/components/schemas/ResolvedCommits' required: - mountDatasets type: object AppVersionDeployment: description: Execution settings for the version. properties: autoscalingSpecification: $ref: '#/components/schemas/AppAutoscalingSpecification' hardwareTierId: type: string vanityUrl: type: string type: object ResolvedCommits: description: >- Resolved commit and import snapshot information captured at version creation time. properties: dfsCommitId: description: The DFS commit ID resolved at version creation time. type: string gitCommitId: description: The git commit SHA resolved at version creation time. type: string importedGitRepos: description: Imported git repo snapshots resolved at version creation time. items: $ref: '#/components/schemas/ImportedGitRepoSnapshot' type: array importedProjects: description: Imported project snapshots resolved at version creation time. items: $ref: '#/components/schemas/ImportedProjectSnapshot' type: array type: object responses: '400': content: application/json: schema: properties: error: type: string type: object description: Bad Request '401': content: application/json: schema: $ref: '#/components/schemas/FailureEnvelopeV1' description: >- The current user cannot perform this operation because they are not logged in '403': content: application/json: schema: $ref: '#/components/schemas/FailureEnvelopeV1' description: The current user is not authorized to perform this operation '404': content: application/json: schema: properties: error: type: string type: object description: Not Found '422': content: application/json: schema: $ref: '#/components/schemas/FailureEnvelopeV1' description: >- The server understands the content type of the request entity, and the syntax of the request entity is correct, but it was unable to process the contained instructions. '500': content: application/json: schema: properties: error: type: string type: object description: Internal Server Error securitySchemes: DominoApiKey: in: header name: X-Domino-Api-Key type: apiKey BearerAuthentication: in: header name: Authorization type: apiKey ````