Fix persistent container endpoint allocation by danegsta · Pull Request #17960 · microsoft/aspire

danegsta · 2026-06-05T17:43:22Z

Description

Persistent container endpoints should behave like normal container endpoints unless the app explicitly opts out of proxy support. This keeps persistent containers compatible with integrations that depend on endpoint allocation happening before resource startup.

This change updates DCP endpoint allocation so persistent containers default to proxied endpoints unless isProxied: false or WithEndpointProxySupport(false) is applied. It also removes the delayed proxyless container allocation path and restores the previous target-port fallback: proxyless container endpoints with a targetPort and no public port immediately use the target port as the allocated host/public port.

For HTTP health checks, this restores the 13.3 timing split: endpoint existence is still validated during ResourceEndpointsAllocatedEvent, while the health-check URI is bound during BeforeResourceStartedEvent. That matters for supported surrogate-resource integrations such as the KeyVault emulator, where the surrogate forwards BeforeResourceStartedEvent but not ResourceEndpointsAllocatedEvent.

The endpoint allocation event is intentionally kept on the 13.4 BlockingSequential dispatch behavior, rather than matching 13.3's NonBlockingConcurrent dispatch. That preserves 13.4 exception propagation and ensures allocation subscribers complete before startup continues.

User-facing behavior

Proxyless container endpoints now resolve immediately when only a target port is specified:

builder.AddContainer("cache", "redis")
       .WithEndpoint(targetPort: 6379, isProxied: false);

That endpoint allocates public/host port 6379 instead of waiting for a delayed allocation update. Persistent executables keep their existing default proxyless behavior.

Breaking changes

This changes endpoint allocation timing and default endpoint behavior for container scenarios. Users who depended on delayed runtime allocation for proxyless container endpoints without an explicit public port should specify the desired public port explicitly or rely on the restored target-port default.

Validation included the DCP executor test suite and a real KeyVault emulator smoke test for both session and persistent container lifetimes.

Checklist

Is this feature complete?
- Yes. Ready to ship.
- No. Follow-up changes expected.
Are you including unit tests for the changes and scenario tests if relevant?
- Yes
- No
Did you add public API?
- Yes
  - If yes, did you have an API Review for it?
    - Yes
    - No
  - Did you add <remarks /> and <code /> elements on your triple slash comments?
    - Yes
    - No
- No
Does the change make any security assumptions or guarantees?
- Yes
  - If yes, have you done a threat model and had a security review?
    - Yes
    - No
- No

Default persistent container endpoints to proxied unless proxy support is disabled, and remove delayed proxyless container endpoint allocation in favor of target-port public port defaults. Preserve endpoint and connection string event timing from release/13.3 and add coverage for the KeyVault emulator-style health check path.\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

github-actions · 2026-06-05T17:44:46Z

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 17960

Or

Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 17960"

Set HTTP health check URIs during BeforeResourceStartedEvent again so surrogate resource builders that forward startup events continue to initialize their health checks. Add DCP coverage for the KeyVault-emulator-style surrogate pattern.\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Adjusts DCP endpoint allocation to make persistent container endpoints behave like normal container endpoints (proxied by default), removes the delayed proxyless allocation mechanism, and restores the proxyless targetPort-as-hostPort default. Also re-splits HTTP health check work so endpoint existence is validated on ResourceEndpointsAllocatedEvent, while the health check URI is bound on BeforeResourceStartedEvent for surrogate-forwarding scenarios.

Changes:

Default persistent container endpoints to proxied unless explicitly proxyless / proxy support disabled; restore proxyless targetPort host-port defaulting.
Remove delayed/on-demand proxyless container port allocation plumbing and related test fake behavior.
Move HTTP health check URI binding to BeforeResourceStartedEvent, keeping endpoint existence validation during ResourceEndpointsAllocatedEvent.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/Aspire.Hosting.Tests/DistributedApplicationTests.cs	Updates expectations for proxyless container port behavior (targetPort defaults host/public port).
tests/Aspire.Hosting.Tests/Dcp/TestKubernetesService.cs	Removes fake “late allocation” path; service port allocation now aligns with targetPort defaulting.
tests/Aspire.Hosting.Tests/Dcp/DcpExecutorTests.cs	Adds coverage for persistent container proxy defaults, targetPort defaulting behavior, and health check URI binding timing.
src/Aspire.Hosting/ResourceBuilderExtensions.cs	Moves HTTP health check URI binding to `OnBeforeResourceStarted`; keeps endpoint existence check during endpoint allocation.
src/Aspire.Hosting/Dcp/DcpResourceWatcher.cs	Stops publishing endpoints-allocated events on service updates; applies observed service address directly to endpoints.
src/Aspire.Hosting/Dcp/DcpModelUtilities.cs	Removes dynamic proxyless allocation helpers and simplifies service->endpoint application APIs.
src/Aspire.Hosting/Dcp/DcpExecutor.cs	Reorders/changes endpoint allocation publishing and defaults persistent container endpoints to proxied.
src/Aspire.Hosting/Dcp/ContainerCreator.cs	Builds proxyless container port mappings using resolved `EndpointAnnotation.Port` (targetPort defaulted).
src/Aspire.Hosting/ApplicationModel/OnDemandEndpointAllocationAnnotation.cs	Removes the on-demand endpoint allocation annotation type.
src/Aspire.Hosting/ApplicationModel/EndpointReference.cs	Removes endpoint allocation “on-demand” fallback; relies on allocated endpoint snapshots directly.
src/Aspire.Hosting/ApplicationModel/EndpointAnnotation.cs	Removes `SpecifiedPort` and relies on `Port` semantics (including proxyless targetPort default).

Keep ResourceEndpointsAllocatedEvent dispatch aligned with release/13.4 so subscriber exceptions propagate and endpoint allocation callbacks complete before startup proceeds.\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

danegsta · 2026-06-05T19:28:09Z

PR Testing Report

PR Information

PR Number: Fix persistent container endpoint allocation #17960
Title: Fix persistent container endpoint allocation
Head Commit: 4e3be3c
Tested At: 2026-06-05 (local, macOS arm64, Docker Desktop)

CLI Version Verification

Expected (PR head short SHA): 4e3be3c
Installed CLI version: 13.4.3-pr.17960.g4e3be3c5
Status: ✅ Verified — version suffix matches PR head commit

Changes Analyzed

Hosting-only change to DCP endpoint allocation:

src/Aspire.Hosting/Dcp/{DcpExecutor,DcpModelUtilities,ContainerCreator,DcpResourceWatcher}.cs
src/Aspire.Hosting/ApplicationModel/{EndpointAnnotation,EndpointReference}.cs (removed OnDemandEndpointAllocationAnnotation)
src/Aspire.Hosting/ResourceBuilderExtensions.cs (health-check URI binding moved to BeforeResourceStartedEvent)
eng/Versions.props, plus DCP/distributed-app tests

Change Categories

Test Setup

A single file-based AppHost (apphost.cs) was created from the PR hive (aspire new aspire-empty) with four traefik/whoami containers, run locally with aspire start against real Docker + DCP, then inspected with aspire describe, curl, and docker inspect.

Test Scenarios Executed

Scenario 1: Proxyless container endpoint with only a target port (happy path)

Config: AddContainer("proxyless","traefik/whoami").WithArgs("--port","8088").WithEndpoint(targetPort: 8088, scheme:"http", isProxied:false)
Expected: Allocated host/public port == target port (8088), reachable directly.
Result: ✅ Passed — aspire describe URL http://localhost:8088; Docker mapping 127.0.0.1:8088->8088/tcp; curl localhost:8088 returned a whoami response. State Running / Health Healthy.

Scenario 2: Persistent container defaults to proxied (happy path)

Config: AddContainer("persistentproxied","traefik/whoami").WithHttpEndpoint(targetPort: 80).WithLifetime(ContainerLifetime.Persistent)
Expected: Endpoint is proxied (random host port, not the target port); container starts cleanly; persistent label true.
Result: ✅ Passed — proxied URL http://localhost:64828 (random), Docker mapping ...:64864->80/tcp, label com.microsoft.developer.usvc-dev.persistent=true. State Running / Health Healthy.

Scenario 3: HTTP health check on a container endpoint — KeyVault-emulator-style timing (happy path)

Config: AddContainer("healthcheck","traefik/whoami").WithHttpEndpoint(targetPort: 80).WithHttpHealthCheck("/")
Expected: Resource reaches Healthy (health-check URI bound at BeforeResourceStartedEvent).
Result: ✅ Passed — aspire describe reported Health = Healthy; proxied endpoint reachable via curl.

Scenario 4: Persistent container with explicit proxyless opt-out (boundary)

Coverage Type: Boundary
Config: AddContainer("persistentproxyless","traefik/whoami").WithArgs("--port","8090").WithEndpoint(targetPort: 8090, scheme:"http", isProxied:false).WithLifetime(ContainerLifetime.Persistent)
Expected: Explicit isProxied:false is honored despite the new persistent→proxied default; host port == target port (8090).
Expected Boundary Outcome: Endpoint stays proxyless and uses the target port rather than being silently upgraded to a proxied endpoint.
Result: ✅ Passed — proxyless URL http://localhost:8090, Docker mapping 127.0.0.1:8090->8090/tcp, reachable via curl. persistent=true label present.

Persistence lifecycle verification (cross-cutting)

After aspire stop, the two session containers (proxyless, healthcheck) were removed, while the two persistent containers (persistentproxied, persistentproxyless) kept running — confirming the persistent lifetime is applied correctly end-to-end. The persistent containers were then cleaned up manually.

`aspire describe` snapshot (while running)

Name                  Type       State    Health   URLs
healthcheck           Container  Running  Healthy  http://localhost:64827
persistentproxied     Container  Running  Healthy  http://localhost:64828
persistentproxyless   Container  Running  Healthy  http://localhost:8090
proxyless             Container  Running  Healthy  http://localhost:8088

Summary

Scenario	Status	Notes
1. Proxyless target-port default	✅ Passed	host port == 8088, reachable
2. Persistent defaults to proxied	✅ Passed	random proxied port, persistent=true
3. HTTP health check timing	✅ Passed	Healthy
4. Persistent + explicit proxyless	✅ Passed	stays proxyless on 8090
Persistence lifecycle (stop)	✅ Passed	session removed, persistent survive

Overall Result

✅ PR VERIFIED — All four scenarios plus the persistence lifecycle check behaved exactly as described in the PR. Proxyless container endpoints resolve to their target port immediately, persistent containers default to proxied while honoring an explicit proxyless opt-out, and container HTTP health checks bind and report Healthy.

Notes

Tested on macOS arm64 with Docker Desktop using a file-based C# AppHost and the traefik/whoami image.
This is an orchestration/timing change; behavior was validated against a real container runtime rather than only generated artifacts.

Use a fixed public Kafka port for the persistent reuse test and let the shared persistent-container helper disable DCP test port randomization when a test needs explicit ports to remain stable.\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

danegsta · 2026-06-05T19:49:45Z

            "resource",
-            useTestContainerRegistry: true);
+            useTestContainerRegistry: true,
+            randomizePorts: false);


Kafka specifically requires the public port to be set in an environment variable, so forcing randomized ports changes the lifecycle key between runs.

github-actions · 2026-06-05T20:33:29Z

❓ CLI E2E Tests unknown — 111 passed, 0 failed, 2 unknown (commit 1273da4)

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Persistent containers use proxied endpoints by default (same as session containers), while persistent executables and projects default to proxyless endpoints. Also document that proxyless container endpoints with only a targetPort immediately allocate the targetPort as the host port. Corrects docs that previously stated all persistent resources default to proxyless endpoints. Documents changes from microsoft/aspire#17960. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

aspire-repo-bot · 2026-06-05T22:12:51Z

Pull request created: #1219

Generated by PR Documentation Check

aspire-repo-bot · 2026-06-05T22:13:51Z

📝 Documentation has been drafted in microsoft/aspire.dev#1219 targeting release/13.4.

Three documentation files updated to correct the persistent container endpoint proxy default, which was changed by this PR:

app-host/resource-lifetimes.mdx: Clarified that persistent containers use proxied endpoints by default (same as session containers), while persistent executables and projects default to proxyless. Added note about proxyless containers with only targetPort immediately allocating that port as the host port.
fundamentals/networking-overview.mdx: Corrected three locations (concepts list, Proxyless endpoints section, EndpointAnnotation reference) that previously stated all persistent resources default to proxyless.
whats-new/aspire-13-4.mdx: Corrected two locations (feature spotlight Aside and breaking-changes entry) to scope the proxyless-by-default statement to executables and projects only.

Note

This draft PR needs human review before merging.

* Fix persistent container endpoint proxy default docs Persistent containers use proxied endpoints by default (same as session containers), while persistent executables and projects default to proxyless endpoints. Also document that proxyless container endpoints with only a targetPort immediately allocate the targetPort as the host port. Corrects docs that previously stated all persistent resources default to proxyless endpoints. Documents changes from microsoft/aspire#17960. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Potential fix for pull request finding Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> --------- Co-authored-by: aspire-repo-bot[bot] <268009190+aspire-repo-bot[bot]@users.noreply.github.com> Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Co-authored-by: David Negstad <50252651+danegsta@users.noreply.github.com> Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

danegsta marked this pull request as ready for review June 5, 2026 18:42

danegsta requested review from JamesNK and mitchdenny as code owners June 5, 2026 18:42

Copilot AI review requested due to automatic review settings June 5, 2026 18:42

danegsta requested review from davidfowl and karolz-ms as code owners June 5, 2026 18:42

Copilot started reviewing on behalf of danegsta June 5, 2026 18:42 View session

Bump Aspire patch version to 13.4.3

3621509

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot AI reviewed Jun 5, 2026

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Comment thread src/Aspire.Hosting/Dcp/DcpExecutor.cs

Comment thread tests/Aspire.Hosting.Tests/Dcp/DcpExecutorTests.cs

danegsta mentioned this pull request Jun 5, 2026

Azure Storage Emulator doesn't start in Aspire 13.4 with persistent container lifetime #17831

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danegsta commented Jun 5, 2026

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joperezr merged commit 4f21893 into release/13.4 Jun 5, 2026
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joperezr deleted the danegsta/persistent-container-endpoints branch June 5, 2026 21:56

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aspire-repo-bot Bot mentioned this pull request Jun 5, 2026

[docs] Fix persistent container endpoint proxy default docs microsoft/aspire.dev#1219

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[repo-pulse] 📊 Repo Pulse — Daily Activity Dashboard #16404

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IEvangelist mentioned this pull request Jun 8, 2026

[docs] Fix persistent container endpoint proxy default docs microsoft/aspire.dev#1227

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Refactor health check to resolve URI directly from an endpoint rather… #18011

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13.4.3 isproxy = false broken #18039

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13.4.3 WithExternalHttpEndpoints doesnt work #18043

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13.4.3 WithHttpHealthCheck not working #18045

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Fix persistent container endpoint allocation#17960

Fix persistent container endpoint allocation#17960
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User-facing behavior

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danegsta commented Jun 5, 2026

PR Testing Report

PR Information

CLI Version Verification

Changes Analyzed

Change Categories

Test Setup

Test Scenarios Executed

Scenario 1: Proxyless container endpoint with only a target port (happy path)

Scenario 2: Persistent container defaults to proxied (happy path)

Scenario 3: HTTP health check on a container endpoint — KeyVault-emulator-style timing (happy path)

Scenario 4: Persistent container with explicit proxyless opt-out (boundary)

Persistence lifecycle verification (cross-cutting)

aspire describe snapshot (while running)

Summary

Overall Result

Notes

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aspire-repo-bot Bot commented Jun 5, 2026

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danegsta commented Jun 5, 2026 •

edited

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github-actions Bot commented Jun 5, 2026 •

edited

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