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Document Daytona integration: sandboxing, snapshots, SSH access, network controls, and troubleshooting
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Bryan Helmkamp
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---
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title: "Daytona"
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description: "Run Arc workflows in sandboxed Daytona development environments"
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description: "Run Arc workflows in sandboxed Daytona cloud environments"
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---
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Coming soon.
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[Daytona](https://daytona.io) provides cloud-hosted sandbox VMs for Arc workflows. Each run gets an ephemeral, isolated environment with its own filesystem, network, and compute resources — keeping your host machine clean and giving agents a reproducible workspace.
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## What the Daytona integration enables
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| Feature | How it's used |
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|---|---|
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| **Sandboxed execution** | Agent tool calls (shell commands, file edits, grep, glob) run inside a cloud VM instead of on the host |
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| **Snapshots** | Pre-built environment images so each run starts with dependencies already installed |
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| **SSH access** | Connect to a running sandbox for live debugging |
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| **Network controls** | Restrict agent egress with block-all or CIDR-based allow lists |
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## Prerequisites
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- A `DAYTONA_API_KEY` environment variable (get one from [app.daytona.io](https://app.daytona.io))
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- A [GitHub App](/integrations/github) configured via the web UI (required for private repository cloning and checkpoint pushing)
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## Configuration
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Set the sandbox provider in your run config TOML or via CLI flag:
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```bash
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arc run start workflow.dot --sandbox daytona
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```
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```toml
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[sandbox]
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provider = "daytona"
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```
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A full configuration example with all Daytona-specific options:
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```toml
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[sandbox]
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provider = "daytona"
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preserve = false
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[sandbox.daytona]
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auto_stop_interval = 60
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[sandbox.daytona.labels]
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project = "arc"
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env = "staging"
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team = "platform"
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[sandbox.daytona.snapshot]
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name = "rust-dev"
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cpu = 4
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memory = 8
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disk = 20
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dockerfile = "FROM rust:1.85-slim-bookworm\nRUN apt-get update && apt-get install -y git ripgrep"
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```
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See [Server Configuration](/administration/server-configuration) for the full reference on all sandbox fields and server defaults.
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### Network access control
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Control outbound network access with the `network` field. Three modes are available:
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```toml
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# Full access (default)
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[sandbox.daytona]
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network = "allow_all"
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# Block all egress
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[sandbox.daytona]
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network = "block"
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# CIDR-based allow list
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[sandbox.daytona]
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network = { allow_list = ["208.80.154.232/32", "10.0.0.0/8"] }
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```
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Use `"block"` or a CIDR allow list when running untrusted or generated code to prevent agents from making arbitrary network requests.
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## Snapshots
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Snapshots let you pre-build an environment image so each run starts with dependencies already installed rather than installing them in setup commands every time.
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```toml
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[sandbox.daytona.snapshot]
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name = "my-snapshot"
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cpu = 4
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memory = 8
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disk = 20
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dockerfile = "FROM node:20-slim\nRUN apt-get update && apt-get install -y git"
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```
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When a run starts with a snapshot configured, Arc looks up the snapshot by name. If it doesn't exist and a `dockerfile` is provided, Arc creates it automatically and polls until it reaches `Active` state (up to 10 minutes). If the snapshot already exists, it's reused immediately.
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<Note>
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If the snapshot doesn't exist and no `dockerfile` is provided, the run fails immediately. Without a snapshot, sandboxes are created from the default `ubuntu:22.04` image.
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</Note>
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## Private repositories
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Arc automatically clones the current repository into the sandbox at `/home/daytona/workspace`. Public repositories work without extra configuration. Private repositories require a [GitHub App](/integrations/github) — Arc uses short-lived Installation Access Tokens scoped to the specific repository.
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If the clone fails without a GitHub App configured, Arc suggests running the setup flow:
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```
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Git clone failed: ... If this is a private repository,
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configure a GitHub App with `arc setup` and install it
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for your organization.
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```
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## SSH access
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Connect to a running Daytona sandbox via SSH for live debugging:
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```bash
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arc run start workflow.dot --sandbox daytona --ssh
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```
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This creates temporary SSH credentials (valid for 60 minutes) and prints the connection command:
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```
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SSH access ready: ssh daytona@arc-20260307-143022-a3f2.ssh.daytona.io
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```
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<Note>
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SSH credentials cannot be refreshed during a run. To keep the sandbox alive after the run completes, combine `--ssh` with `--preserve-sandbox`.
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</Note>
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## Sandbox lifecycle
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Each sandbox gets a unique timestamped name (e.g. `arc-20260307-143022-a3f2`) and is created as ephemeral. By default, sandboxes are destroyed when the run finishes.
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### Preservation
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To keep a sandbox alive for debugging:
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```bash
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arc run start workflow.dot --sandbox daytona --preserve-sandbox
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```
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Or in the run config:
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```toml
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[sandbox]
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provider = "daytona"
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preserve = true
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```
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When preserved, Arc prints the sandbox name so you can find it in the [Daytona dashboard](https://app.daytona.io/dashboard/sandboxes).
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### Auto-stop
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The `auto_stop_interval` setting tells Daytona to stop the sandbox after a period of inactivity, saving costs for preserved or long-running sandboxes:
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```toml
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[sandbox.daytona]
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auto_stop_interval = 30
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```
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## Server defaults
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When running via `arc serve`, the server config at `~/.arc/server.toml` can set default Daytona settings for all runs. Run config TOML values override server defaults. Labels are **merged** — run config labels win on key collisions. The `network` setting uses simple override (run config replaces the server default entirely).
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See [Server Configuration](/administration/server-configuration) for details.
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## Troubleshooting
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### "Failed to create Daytona sandbox"
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The `DAYTONA_API_KEY` environment variable is missing or invalid. Verify it's set in your `.env` file and check that it's a valid key from [app.daytona.io](https://app.daytona.io).
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### "Snapshot does not exist and no dockerfile provided"
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The run config references a snapshot name that doesn't exist on Daytona, and no `dockerfile` is provided to create it. Either create the snapshot manually in the Daytona dashboard or add a `dockerfile` field to `[sandbox.daytona.snapshot]`.
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### "Timed out waiting for snapshot to become active"
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Snapshot creation took longer than 10 minutes. This can happen with large Dockerfiles. Check the snapshot status in the Daytona dashboard — it may still be building. Subsequent runs will reuse the snapshot once it's active.
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### Git clone fails for private repositories
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See [Private repositories](#private-repositories) above. You need a GitHub App configured and installed on the repository's organization or account.
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### Stall watchdog kills the run
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Long-running commands in Daytona sandboxes may trigger the 600-second stall watchdog if they don't produce events. For workflows with long-running operations, increase the `stall_timeout` in the workflow graph:
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```dot
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digraph Example {
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graph [stall_timeout="1200"]
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}
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```
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