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---
stage: Verify
group: Runner
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
---
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# VM instances and images for Build Cloud for macOS
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When you use the Build Cloud for macOS:
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- Each of your jobs runs in a newly provisioned VM, which is dedicated to the specific job.
- The VM is active only for the duration of the job and immediately deleted.
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## VM types
The virtual machine where your job runs has `sudo` access with no password.
For the Beta, there is only one available machine type, `gbc-macos-large` .
| Instance type | vCPUS | Memory (GB) |
| --------- | --- | ------- |
| `gbc-macos-large` | 4 | 10 |
## VM images
You can execute your build on one of the following images.
You specify this image in your `.gitlab-ci.yml` file.
Each image is running a specific version of macOS and Xcode.
| VM image | Included software |
|---------------------------|--------------------|
| macos-10.13-xcode-7 | < https: / / gitlab . com / gitlab-org / ci-cd / shared-runners / images / macstadium / orka / - / blob / main / toolchain / high-sierra . yml > |
| macos-10.13-xcode-8 | < https: / / gitlab . com / gitlab-org / ci-cd / shared-runners / images / macstadium / orka / - / blob / main / toolchain / high-sierra . yml > |
| macos-10.13-xcode-9 | < https: / / gitlab . com / gitlab-org / ci-cd / shared-runners / images / macstadium / orka / - / blob / main / toolchain / high-sierra . yml > |
| macos-10.14-xcode-10 | < https: / / gitlab . com / gitlab-org / ci-cd / shared-runners / images / macstadium / orka / - / blob / main / toolchain / mojave . yml > |
| macos-10.15-xcode-11 | < https: / / gitlab . com / gitlab-org / ci-cd / shared-runners / images / macstadium / orka / - / blob / main / toolchain / catalina . yml > |
| macos-11-xcode-12 | < https: / / gitlab . com / gitlab-org / ci-cd / shared-runners / images / macstadium / orka / - / blob / main / toolchain / big-sur . yml > |
### Image update policy
- Support for new macOS versions is planned.
- Additional details on the support policy and image update release process are documented
[in this project ](https://gitlab.com/gitlab-org/ci-cd/shared-runners/images/macstadium/orka/-/blob/55bf59c8fa88712960afff2bf6ecc5daa879a8f5/docs/overview.md#os-images ).
