I haven't. I have an image processing container so that I can use sharp to batch convert images and

I haven't. I have an image processing container so that I can use sharp to batch convert images and store them in R2. I start it up frequently, upload more images, start it up again to do those etc.

what is you use case where this occurs?

gruntlord6OP•8/15/25, 11:52 PM

is there a way to see billable container usage?

Ggruntlord6 I haven't. I have an image processing container so that I can use sharp to batch...

CD_CNTNew•8/16/25, 3:15 AM

Just normal http backend in the containers, stateless even. Thought it's a simple usecase for testing the containers on cloudflare, but never thought what happened like this. I guess containers never got requests from workers or durable objects bound with them, sort of bugs?

gruntlord6OP•8/16/25, 3:16 AM

sorry I'm not really following, you have a web service running from the container directly and it never responds?

CD_CNTNew•8/16/25, 3:17 AM

actually never start up I think. Once start up successfully, they can respond quite well

gruntlord6OP•8/16/25, 3:18 AM

it should start as soon as you run the attached durable object

CD_CNTNew•8/16/25, 3:19 AM

yes, at the begining just deployed, they worked well but after several times start and stop, they appeared harder to wake again

gruntlord6OP•8/16/25, 3:20 AM

no idea, I've even had 10 instances running for the same job without any issues starting them and stopping them

CD_CNTNew•8/16/25, 3:21 AM

how about the sleepafter of your containers?

gruntlord6OP•8/16/25, 3:21 AM

although I always communicate with the durable objects associated with the container

gruntlord6OP•8/16/25, 3:21 AM

its set to 30s so I can keep them warm, I was worried the image conversion might take longer then 10s and I don't want it shutting down mid conversion

gruntlord6OP•8/16/25, 3:22 AM

but I also don't want them running longer then i need them

CD_CNTNew•8/16/25, 3:22 AM

I set it to 3m

CCD_CNTNew I set it to 3m

gruntlord6OP•8/16/25, 3:22 AM

that would mean that unless you end the task properly it says alive for 3m doing nothing

gruntlord6OP•8/16/25, 3:23 AM

well assuming it finishes the task in that frame, for example when I was using one instance it would keep running as long as I kept it queued with tasks

CD_CNTNew•8/16/25, 3:23 AM

just want them to run as long as I need, coz after they turned inactive, hard to wake them up

gruntlord6OP•8/16/25, 3:24 AM

theres a 3 second cold start, is that accounted for when you are waking them up?

gruntlord6OP•8/16/25, 3:24 AM

or do they just fail to start at all

CD_CNTNew•8/16/25, 3:25 AM

fail to start

gruntlord6OP•8/16/25, 3:25 AM

is it something in your code then?

CD_CNTNew•8/16/25, 3:28 AM

I tested the image locally, worked well, and on cloudflare they could work after just deployed, so I think the codes are ok

CD_CNTNew•8/16/25, 3:32 AM

on the worker side, I've got the messages like no container instance or no tcp port listening, on the container side, no requests arrived so that I think no chance for my codes to run

Alexander•8/17/25, 4:43 PM

Hey all! I tried to find sandbox instance limits but there is no clear answer in the docs anywhere - am I missing anything? the reference to container limits is a bit confusing. Does it mean that max sanbox instance == max container instance for the user account? (or project)?

Appreciate the reply

AAlexander Hey all! I tried to find sandbox instance limits but there is no clear answer in...

gruntlord6OP•8/17/25, 6:00 PM

sanbox?

gruntlord6OP•8/17/25, 6:00 PM

do you mean the max instances you define?

Alexander•8/17/25, 8:36 PM

yep referring to @Cloudflare/sandboxes

aren't max instances referring to max container instances? or 1 sanbox == 1 container instance used?

Khagan•8/17/25, 9:35 PM

Hello, I'm using Next.js + Django. Is it possible to deploy this on cloudflare containers?

AAlexander yep referring to @Cloudflare/sandboxes aren't max instances referring to max c...

1984 Ford Laser•8/17/25, 10:14 PM

Yeah a sandbox is a container instance

1984 Ford Laser•8/18/25, 7:49 AM

Any news on containers allowing arbitrary TCP/UDP traffic? RTMP in/out is a major use case for me

TobiLG•8/18/25, 12:55 PM

I currently see very slow container deployments, around 10min from what I can see in th Containers Dashboard... And then it takes a few minutes afterwards until I no longer see

A call to blockConcurrencyWhile() in a Durable Object waited for too long. The call was canceled and the Durable Object was reset

A call to blockConcurrencyWhile() in a Durable Object waited for too long. The call was canceled and the Durable Object was reset

errors. Is this to be expected currently? Edit: It took nearly 15min after the intial deployment until requests were served

Marco Aleixo•8/18/25, 2:22 PM

hey team - is there a limit of subrequests in containers as well?

darkpool•8/18/25, 7:18 PM

do containers support grpc? Couldnt find any mention of it in docs. If not, is support on roadmap?

MrBithles•8/18/25, 7:30 PM

Is the concept containers only for local/isolated tasks that can be executed by a worker.
As I've been struggling to get a simple container to run which can handle requests to call external sites with fetch requests or Playwright.
Issues like:

Singletons objects in worker are not scoped to code that runs in container, its obv to say but not obv in code what is scoped.

Contains can't do network requests? (

✘ [ERROR] Error: [unenv] https.request is not implemented yet!

✘ [ERROR] Error: [unenv] https.request is not implemented yet!

)

Not sure why examples/templates as for hono app vs the worker request class, I was initially treating index.ts as the entry to Docker

The way of getting a container seems odd, following the example of using getRandom always throws an error first:

✘ [ERROR] Error checking if container is ready: connect(): Connection refused: container port not found. Make sure you exposed the port in your container definition.
✘ [ERROR] Error checking if container is ready: The operation was aborted
Container exited with unexpected exit code: 1 {"exitCode":1,"name":"Error","stack":"Error: Container exited with unexpected exit code: 1"}
[wrangler:info] POST / 500 Internal Server Error (2153ms)
✘ [ERROR] Error: [unenv] https.request is not implemented yet!

✘ [ERROR] Error checking if container is ready: connect(): Connection refused: container port not found. Make sure you exposed the port in your container definition.
✘ [ERROR] Error checking if container is ready: The operation was aborted
Container exited with unexpected exit code: 1 {"exitCode":1,"name":"Error","stack":"Error: Container exited with unexpected exit code: 1"}
[wrangler:info] POST / 500 Internal Server Error (2153ms)
✘ [ERROR] Error: [unenv] https.request is not implemented yet!

TobiLG•8/18/25, 10:12 PM

Deployments really seem to be oscilliating today.... Earlier the containers were available within a minute again, but now >10min and nothing... How can this be debugged? Is this expected?

MMrBithles Is the concept containers only for local/isolated tasks that can be executed by ...

kian•8/19/25, 12:06 AM

That unenv error sounds more related to your Worker than the Container itself

TTobiLG Deployments really seem to be oscilliating today.... Earlier the containers were...

kian•8/19/25, 12:21 AM

What exactly are you measuring, the time when making a request to an inactive instance?

Kkian What exactly are you measuring, the time when making a request to an inactive in...

TobiLG•8/19/25, 5:22 AM

Recurrent curl requests to the endpoints, until the service gets available. Had everything between 1-20mins yesterday. And that is after the Dashboard says the deployments are done… Honestly, this is not really tolerable for a Container Service when people want to iterate quickly during development. Also, sometimes it seems that I receive cached responses, even though all the old instances are shown to be shut down, which is strange. I‘m aware that this is in beta, but multi-minute downtimes upon redeployments might be a showstopper.

TobiLG•8/19/25, 5:26 AM

I‘ve been part of the private beta, and I didn’t see this behavior before. Unsure if there‘s something I can do to improve this on my end, or how to debug this. The Worker logs show the timeouts to DOs, but no error messages

Nick•8/19/25, 9:50 AM

Does anyone know what happens if I redeploy the DO while a container is running? Will the container be killed?

Meathill•8/19/25, 3:37 PM

Hello, everyone. I tried to setup a Strapi Docker on worker, but now I am stuck at

Failed to start container: The container is not listening in the TCP address 10.0.0.1:1337

Failed to start container: The container is not listening in the TCP address 10.0.0.1:1337

Anyone can help me? Thank you all

Jjschlesser make sure you have a line like this in your Dockerfile `EXPOSE 1337` and dont fo...

Meathill•8/19/25, 4:22 PM

Yes, I think so, I have test this Image locally and it works well

Jjschlesser locally use localhost instead of 10.0.0.1 , you will have to do some environment...

Meathill•8/19/25, 4:24 PM

I tried 0.0.0.0 before, and it didn't work. So

localhost

localhost

should be better?

Jjschlesser what is the code you are using to connect?

Meathill•8/19/25, 4:25 PM

Sorry, I don't understand. What code do you mean? I hope to setup a Strapi docker as my backend, currently I cannot visit from browser.

Meathill•8/19/25, 4:32 PM

OK, I have used docker builddocker build locally and docker rundocker run locally to make sure my

Dockerfile

Dockerfile

works.
Then I followed the tutorial from Cloudfalre to create this worker.
The entry is quite simple, like a few lines of code:

✘ [ERROR] Error checking if container is ready: connect(): Connection refused: container port not found. Make sure you exposed the port in your container definition. ✘ [ERROR] Error checking if container is ready: The operation was aborted Container exited with unexpected exit code: 1 {"exitCode":1,"name":"Error","stack":"Error: Container exited with unexpected exit code: 1"} [wrangler:info] POST / 500 Internal Server Error (2153ms) ✘ [ERROR] Error: [unenv] https.request is not implemented yet!

I haven't. I have an image processing container so that I can use sharp to batch convert images and

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