Platform

Instance Types

The memory, vCPU, and disk space for Containers are set through predefined instance types. Three instance types are currently available:

Instance Type	Memory	vCPU	Disk
dev	256 MiB	1/16	2 GB
basic	1 GiB	1/4	4 GB
standard	4 GiB	1/2	4 GB

These are specified using the instance_type property in your Worker's Wrangler configuration file. Looking for larger instances? Give us feedback here and tell us what size instances you need, and what you want to use them for.

Limits

While in open beta, the following limits are currently in effect:

Feature	Workers Paid
GB Memory for all concurrent live Container instances	40GB 1
vCPU for all concurrent live Container instances	20 1
GB Disk for all concurrent live Container instances	100GB 1
Image size	2 GB
Total image storage per account	50 GB 2

Environment variables

The container runtime automatically sets the following variables:

• CLOUDFLARE_COUNTRY_A2 - a two-letter code of a country the container is placed in
• CLOUDFLARE_DEPLOYMENT_ID - the ID of the container instance
• CLOUDFLARE_LOCATION - a name of a location the container is placed in
• CLOUDFLARE_NODE_ID - an ID of a machine the container runs on
• CLOUDFLARE_PLACEMENT_ID - a placement ID
• CLOUDFLARE_REGION - a region name

Note

If you supply environment variables with the same names, supplied values will override predefined values.

Custom environment variables can be set when defining a Container in your Worker:

class MyContainer extends Container {
  defaultPort = 4000;
  envVars = {
    MY_CUSTOM_VAR: "value",
    ANOTHER_VAR: "another_value",
  };
}

Footnotes

1. This limit will be raised as we continue the beta. ↩ ↩² ↩³

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