Help needed on minimum AWS EC2 instance specifications for Cal.com

[tuladhar]

I'm attempting to deploy Cal.com (v5.6.0) using Docker on an AWS EC2 instance, but it fails to start on a t4g.micro (1 vCPU, 1GB RAM) instance with the following error during the yarn install step:

#18 623.8 ➤ YN0007: │ calcom-monorepo@workspace:. must be built because it never has been before or the last one failed
#18 623.8 ➤ YN0007: │ prisma@npm:5.11.0 must be built because it never has been before or the last one failed
#18 623.8 ➤ YN0007: │ prisma@npm:5.4.2 must be built because it never has been before or the last one failed
#18 ERROR: process "/bin/sh -c yarn install" did not complete successfully: exit code: 137
failed to execute bake: read |0: file already closed

I could not find any information about the minimum server requirements in the official self-hosting guide. Could someone please advise on what the minimum AWS EC2 instance specifications are for running Cal.com?

Currently, I’m trying on a t4g.medium instance (2 vCPU, 4GB RAM) to see if that resolves the issue. It would be very helpful if the recommended minimum specs could be documented in the official guide for reference.

Thanks!

[dosubot[bot]]

Hi @tuladhar! I'm Dosu and I’m helping the cal.com team.

The error you’re seeing on t4g.micro (1 vCPU, 1GB RAM) is due to the build process running out of memory—exit code 137 means the OS killed the process for exceeding available RAM. This is a common issue with Cal.com’s build, especially during steps like yarn install and Prisma compilation, which require significantly more memory than 1GB. Users have reported that even 2GB RAM is not enough, and upgrading to 4GB or higher resolves the build failures and out-of-memory errors [source].

There’s no official minimum spec documented in the codebase or guides, but community experience and the resource-intensive build process suggest that an instance with at least 2 vCPUs and 4GB RAM (like t4g.medium) is a practical minimum for reliable Docker-based deployment [source]. The Dockerfiles and documentation do not specify any minimum hardware requirements or make distinctions between ARM (t4g) and x86 instances, but the memory requirement applies to both architectures.

It would be helpful for the official self-hosting guide to document these minimum specs and note that builds on low-memory instances are likely to fail. If you proceed with t4g.medium, you should be able to build and run Cal.com successfully.

To reply, just mention @dosu.

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