Warm Pools

Warm pools keep a configured number of pre-created, running sandboxes built from a snapshot in a specific region. When you create a sandbox that matches a pool, Daytona hands over a warm sandbox instead of provisioning a new one, so the sandbox is available instantly.

A sandbox create request claims a warm sandbox when all of the following match the pool:

• The same snapshot
• The same target region
• The snapshot's default resources (CPU, memory, and disk)
• The default OS user (daytona)
• No custom environment variables, volumes, or secrets

When a request claims a warm sandbox, Daytona applies the name, labels, auto-stop, auto-pause, auto-archive, and auto-delete intervals, and network settings from the create request, and creates a new warm sandbox in the background to keep the pool at its configured size.

An organization can have one warm pool per snapshot per region. Warm sandboxes count against your organization quota, so the pool size multiplied by the snapshot's resources must fit within your region quota.

Create a warm pool

Create a warm pool for a snapshot.

The snapshot must be active and available in the target region. Creating a second pool for the same snapshot and region returns a 409 error.

1. Go to Daytona Snapshots ↗
2. Click the snapshot you want to create a warm pool for
3. In the Warm Pool section, select a region and enter the Pool size
4. Click Add warm pool

from daytona import Daytona

daytona = Daytona()
pool = daytona.warm_pool.create("my-snapshot", pool=3, target="us")

List warm pools

List the warm pools in your organization. Each pool reports the desired size (pool) and the number of warm sandboxes currently ready (currentSize). If Daytona cannot fill the pool, for example because the snapshot is no longer active, the errorReason field explains why.

1. Go to Daytona Snapshots ↗
2. Click a snapshot to see its warm pools per region in the Warm Pool section

for pool in daytona.warm_pool.list():
    print(f"{pool.snapshot}: {pool.current_size}/{pool.pool} ready")

Resize a warm pool

Resize a warm pool to change the desired number of warm sandboxes. Daytona converges the pool to the new size in the background: it creates warm sandboxes when the pool is below the target and destroys the newest unclaimed ones when it is above. Setting pool to 0 drains the pool without deleting its configuration.

1. Go to Daytona Snapshots ↗
2. Click the snapshot to resize the warm pool for
3. In the Warm Pool section, click Edit
4. Enter the new Pool size and click Save

daytona.warm_pool.update(pool.id, pool=5)

Delete a warm pool

Delete a warm pool and destroy all of its unclaimed warm sandboxes. Sandboxes already claimed from the pool are not affected. Deleting a snapshot also deletes its warm pools.

1. Go to Daytona Snapshots ↗
2. Click the snapshot to delete the warm pool for
3. In the Warm Pool section, click the trash icon
4. Click Delete to confirm

daytona.warm_pool.delete(pool.id)

List warm sandboxes

Unclaimed warm sandboxes are excluded from sandbox listings by default. Set the includeWarm query parameter to include them. While a sandbox waits in a pool, its warmPoolId field holds the id of the pool; the field is cleared when the sandbox is claimed.

1. Go to Daytona Sandboxes ↗
2. Enable the Warm pool filter; warm sandboxes show a Warm badge next to their name

curl 'https://app.daytona.io/api/sandbox?includeWarm=true' \
  --header 'Authorization: Bearer YOUR_API_KEY'