Limits and Instance Types

Last updated Oct 21, 2026 Note

All instance size maximums and account limits on this page are defaults and can be increased. To request higher limits, contact your account team or Cloudflare Support.

Instance Types

The memory, vCPU, and disk space for Containers are set through instance types. You can use one of six predefined instance types or configure a custom instance type.

For an application that uses the default scheduling policy, specify the size with the instance_type property in your Worker's Wrangler configuration file. For the durable_object policy, pass the named size to ctx.container.start() with the runtime instance property.

Note

The dev and standard instance types are preserved for backward compatibility and are aliases for lite and standard-1, respectively.

Custom Instance Types

In addition to the predefined instance types, you can configure custom instance types. Field names depend on where you configure the size. Wrangler configuration for the default policy uses vcpu, memory_mib, and disk_mb. A ctx.container.start() call for the durable_object policy uses vcpu, memoryMib, and diskMb.

Refer to the Wrangler configuration documentation or scheduling policy documentation for examples.

Custom instance types have the following constraints:

For workloads requiring less than 1 vCPU, use the predefined instance types such as lite or basic.

Account limits

The following limits apply per account:

Snapshot limits

The following limits apply to Container snapshots:

Restoring a snapshot refreshes its 30-day time-to-live.

Footnotes

1. Delete container images with wrangler containers delete to free up space. If you delete a container image and then roll back your Worker to a previous version, this version may no longer work. ↩

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