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Talos Linux has a set of system volumes that are used for various purposes, such as storing the system state, ephemeral data, and more. This guide provides an overview of the system volumes and how to configure them.

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EPHEMERAL volume

The EPHEMERAL volume is a system volume that is used for storing ephemeral data, such as container data, downloaded images, logs, and etcd data (for controlplane nodes).
Note: The volume configuration in the machine configuration is only applied when the volume has not been provisioned yet. So applying changes after the initial provisioning will not have any effect.
To configure the EPHEMERAL (/var) volume, append the following document to the machine configuration:
Every field in the VolumeConfig resource is optional, and if a field is not specified, the default value is used. The default built-in values are:
By default, the EPHEMERAL volume is provisioned on the system disk, which is the disk where Talos Linux is installed. It has a minimum size of 2 GiB and automatically grows to utilize the maximum available space on the disk. If you would like to keep the EPHEMERAL volume on the system disk but limit its size to 40 GiB, you can set the maxSize field to 40GiB:
If you want to create a separate partition for EPHEMERAL on a different disk, you can set the diskSelector field to select the desired disk:

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IMAGECACHE volume

This system volume is not provisioned by default, and it only gets created if the Image Cache feature is enabled. See Image Cache configuration for more details.