My Flutter Web service has been stuck on "scheduling build on Metal builder (builder-cbuxkt)" for over 10 minutes without executing a single line of the Dockerfile. The build never starts and eventually fails with "Failed to build an image." **What I've tried:** \- Multiple redeployments \- Switched builder back and forth between Nixpacks and Dockerfile \- Updated the Dockerfile to use a lighter base image (debian:bookworm-slim instead of [ghcr.io/cirruslabs/flutter:stable](http://ghcr.io/cirruslabs/flutter:stable)) \- Verified Root Directory and Dockerfile path (/Dockerfile) are correct **Build logs only show:** \`\`\` scheduling build on Metal builder "builder-cbuxkt" scheduling build on Metal builder "builder-cbuxkt" ``` ``` **Setup:** \- Branch: main \- Builder: Dockerfile at /Dockerfile \- No Root Directory set (Dockerfile is at repo root) \- Plan: Hobby (paid) This seems to be an infrastructure issue on Railway's side as the configuration is correct and was working before. Please advise.

Builder stuck on "scheduling build on Metal builder" — never starts

maelstroml7

PROOP

8 months ago

My Flutter Web service has been stuck on "scheduling build on Metal builder (builder-cbuxkt)" for over 10 minutes without executing a single line of the Dockerfile. The build never starts and eventually fails with "Failed to build an image."

What I've tried:

- Multiple redeployments

- Switched builder back and forth between Nixpacks and Dockerfile

- Updated the Dockerfile to use a lighter base image (debian:bookworm-slim instead of ghcr.io/cirruslabs/flutter:stable)

- Verified Root Directory and Dockerfile path (/Dockerfile) are correct

Build logs only show:

```

scheduling build on Metal builder "builder-cbuxkt"

Setup:

- Branch: main

- Builder: Dockerfile at /Dockerfile

- No Root Directory set (Dockerfile is at repo root)

- Plan: Hobby (paid)

This seems to be an infrastructure issue on Railway's side as the configuration is correct and was working before. Please advise.

11 Replies

brody

EMPLOYEE

8 months ago

Hello,

We have escalated this so the platform team can take a look at it.

Status changed to Awaiting User Response Railway • 8 months ago

mikailatasevermk-debug

HOBBY

8 months ago

same problem here.

Status changed to Awaiting Railway Response Railway • 8 months ago

dirtydegree

HOBBY

8 months ago

Same here too

brody

Hello, We have escalated this so the platform team can take a look at it.

dirtydegree

HOBBY

8 months ago

Same for me too

alesanderlg

PRO

8 months ago

Same problem for me.

ohcedar

HOBBY

8 months ago

Same problem. I have a fastapi service, and it usually builds and deploys in under a minute. Going on 8 minutes when I canceled, and the only thing in the log is:

scheduling build on Metal builder "builder-xayinw"

EDIT: I got it to build and deploy by turning off "Use Metal Build Environment" in settings.

ohcedar

Same problem. I have a fastapi service, and it usually builds and deploys in under a minute. Going on 8 minutes when I canceled, and the only thing in the log is: scheduling build on Metal builder "builder-xayinw" EDIT: I got it to build and deploy by turning off "Use Metal Build Environment" in settings.

Anonymous

HOBBY

7 months ago

that saved me. thanks.

uxmohamed

HOBBY

7 months ago

SAME HERE FOR ME

uxmohamed

SAME HERE FOR ME

ohcedar

HOBBY

7 months ago

See my post above. I found a workaround.

sdullaghan

PRO

a month ago

Can anyone guide me to where this Turn off Use Metal Build feature is, as cant find it and have 2 projects that are constantly failing to deploy.

sdullaghan

Can anyone guide me to where this Turn off Use Metal Build feature is, as cant find it and have 2 projects that are constantly failing to deploy.

dareto-dream

PRO

15 days ago

removed as of recently

Welcome!