Has anyone figured out how to pass build args to the container image during the build? I need to acc

Has anyone figured out how to pass build args to the container image during the build? I need to access an environment variable at build time, but I haven’t found a way to pass

--build-arg

--build-arg

s or something similar when building a Dockerfile

Hhenri Has anyone figured out how to pass build args to the container image during the ...

kian•7/31/25, 12:32 AM

It sounds like you want

image_vars

image_vars

in the Wrangler config under

containers

containers

kian•7/31/25, 12:32 AM

{
  "containers": [
    {
      "class_name": "MyContainer",
      "image": "./Dockerfile",
      "max_instances": 10,
      "instance_type": "basic",
      "image_vars": {
        "FOO": "BAR"
      }
    }
  ]
}

{
  "containers": [
    {
      "class_name": "MyContainer",
      "image": "./Dockerfile",
      "max_instances": 10,
      "instance_type": "basic",
      "image_vars": {
        "FOO": "BAR"
      }
    }
  ]
}

kian•7/31/25, 12:32 AM

I don't think there's anything for reading it from an environment variable though.

Kkian I don't *think* there's anything for reading it from an environment variable tho...

henriOP•7/31/25, 5:28 AM

I see... I was hoping I would be able to read it using

ARG

ARG

or something like that

Codename_404•7/31/25, 8:39 AM

You are billed for your usage of both Workers and Durable Objects.

Does this mean, i will be charged for the entire execution time for all 3? DO, container and worker?

Kkian ```json { "containers": [ { "class_name": "MyContainer", "imag...

Yash•7/31/25, 9:01 AM

Does it support a minimum instance setting, so that at least one instance stays active to avoid delays caused by container cold starts?

Hhenri I see... I was hoping I would be able to read it using `ARG` or something like t...

kian•7/31/25, 12:25 PM

Can’t you use ENV?

Julian•8/1/25, 12:38 PM

After reducing the number of max_instances i get the Error "The maximum amount of containers allowed to run in the Durable Object namespace is the same to the amount of running Durable Object Containers, we won't be able to assign an instance to this Durable Object Container" when trying to start a container. how can i fix that

CCodename_404 You are billed for your usage of both Workers and Durable Objects. Does this me...

John Spurlock•8/1/25, 2:01 PM

Yes, the DO and container based on actual time, and the entry worker based on cpu time only (which will be much less if it is just calling a DO and waiting for IO)

HHello, I’m Allie!Sorry about that, I completely missed which channel we are in. R2 does not bill ...

gruntlord6•8/1/25, 2:52 PM

what if it was proxied through the durable object? It's very odd that egress is charged when its not leaving cloudflare, especially since thats not how any other cloudflare compute works

JJohn Spurlock Yes, the DO and container based on actual time, and the entry worker based on cp...

Codename_404•8/1/25, 3:45 PM

So it will also charge for DO IO, as well as CPU time?
of so it should be very expensive for large project, right?

dustiiin•8/1/25, 5:26 PM

Hello, where do i see billable usage for containers?

Ddustiiin Hello, where do i see billable usage for containers?

John Spurlock•8/1/25, 5:33 PM

hmm, good question - it's not currently on the account-level billable usage page

https://dash.cloudflare.com/<account-id>/billing/billable-usage

https://dash.cloudflare.com/<account-id>/billing/billable-usage

so the best thing it seems would be to use the GraphQL analytics api

https://developers.cloudflare.com/analytics/graphql-api/

captainclaw•8/1/25, 5:40 PM

The 0.5 vcpu is killing me. The highest tier should not have cpu contention issues.

I have workloads that I cannot reason about, in terms of when or if they’ll complete.

I’m trying to run an agent and it basically just stalls a long time. Anyways, I put them in fly.io for now, but I’d really love to stay within the Cloudflare ecosystem

AAaronO I think I have an idea on how to implement "durable containers", without any fur...

1984 Ford Laser•8/2/25, 10:20 AM

What does this mean exactly?

KTrain•8/2/25, 11:04 AM

same question

KTrain•8/2/25, 11:05 AM

it sounds like something of a combination of durable objects and containers, which I'm a bit confused on

KKTrain it sounds like something of a combination of durable objects and containers, whi...

1984 Ford Laser•8/2/25, 11:06 AM

Which is literally what Containers already is

11984 Ford Laser Which is literally what Containers already is

KTrain•8/2/25, 11:06 AM

basically what I was thinking

dustiiin•8/2/25, 8:37 PM

Hello i configured a sleepAfter of 2 minutes, but there is a container running for over 20 hours now and the last interaction is 50 minutes old but it keeps staying up
is this normal or a bug and how do i stop it?

userzach•8/3/25, 2:59 AM

Hi! I participated in Private Beta. I might be affected by https://github.com/cloudflare/workers-sdk/issues/9898.

My specific error is:

"The image registry does not exist"

"The image registry does not exist"

I'm requesting manual Container registry provisioning, please.

Uuserzach Hi! I participated in Private Beta. I might be affected by https://github.com/cl...

kian•8/3/25, 12:47 PM

What is your account ID?

Kkian What is your account ID?

userzach•8/3/25, 5:27 PM

c1d1f202453d0fe81fa2838acc91e60a

Thank you! Have a good day!

Ddustiiin Hello i configured a sleepAfter of 2 minutes, but there is a container running f...

dustiiin•8/3/25, 6:09 PM

Hey looking for help... the instance is running now for over 40 hours without any interactions in it. It seems that the sleepAfter is not triggering
In the meanwhile there is a second instance that is not stopping

Uuserzach c1d1f202453d0fe81fa2838acc91e60a Thank you! Have a good day!

kian•8/3/25, 6:43 PM

I’ve passed it onto the team

Ddustiiin Hey looking for help... the instance is running now for over 40 hours without an...

dustiiin•8/4/25, 9:06 AM

deleted everything and rebuild the project. But it is happening again?

peterp•8/4/25, 9:34 AM

Is there a way to get a list of container instances running against the durable object?

Ppeterp Is there a way to get a list of container instances running against the durable ...

1984 Ford Laser•8/4/25, 9:45 AM

The Containers UI in the dashboard?

peterp•8/4/25, 9:48 AM

Oh, I mean programatically

11984 Ford Laser The Containers UI in the dashboard?

peterp•8/4/25, 9:49 AM

And if you are not from South Africa, I would be deeply surprised. My uncle had a Ford Laser!

1984 Ford Laser•8/4/25, 9:49 AM

Australia actually!

peterp•8/4/25, 9:49 AM

Ah, okay, maybe it's an Antipodean thing!

peterp•8/4/25, 9:50 AM

Pleasure to meet another person on the south side!

Ppeterp Oh, I mean programatically

1984 Ford Laser•8/4/25, 9:50 AM

You can pull a list of objects per DO namespace using the REST api

1984 Ford Laser•8/4/25, 9:50 AM

Lemme find the doc one sec

11984 Ford Laser You can pull a list of objects per DO namespace using the REST api

peterp•8/4/25, 9:51 AM

I was hoping that I could emulate this in development, but would be happy to look at that API. Thank you!

1984 Ford Laser•8/4/25, 9:51 AM

https://developers.cloudflare.com/api/resources/durable_objects/subresources/namespaces/subresources/objects/methods/list/

Uuserzach c1d1f202453d0fe81fa2838acc91e60a Thank you! Have a good day!

kian•8/4/25, 10:15 AM

It should be fixed now

Rapid•8/4/25, 9:16 PM

Is it possible to run whisper-large on a container? Is there some kind of GPU support?

kian•8/4/25, 9:18 PM

Not currently although we do have Whisper on Workers AI (https://developers.cloudflare.com/workers-ai/models/whisper-large-v3-turbo)

Rapid•8/4/25, 9:49 PM

Yeah I'm gonna use it for now, just looking on how to reduce latency on that.

Rapid•8/4/25, 9:49 PM

Even though it's probably minor if it sits in the same datacenter

Rapid•8/4/25, 9:49 PM

But still want to minimize latency to 0

adhami•8/5/25, 1:57 AM

is there a template for building (and deploying) the docker machine in github CI?

jmickelly•8/5/25, 8:13 AM

Hey, I just have a question around Cloudflare containers, does it support nested virtualization, such that it can run microVMs in the container using KVM?

McKamyk•8/6/25, 3:51 AM

Will containers sleep if there's an active websocket to them?

Has anyone figured out how to pass build args to the container image during the build? I need to acc

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