Google iconGoogleAug 25, 2026 ~1 min source read

Bringing gVisor sandboxes to distributed Ray clusters

The reinforcement learning (RL) ecosystem is rapidly adopting Ray as the unified compute runtime for complex post-training workflows. As agentic and reasoning models evolve, a critical bottleneck has emerged: orchestrating secure, isolated sandboxes at scale to safely execute dynamic rollouts, code generation, and multi-turn tool interactions.

Bringing gVisor sandboxes to distributed Ray clusters

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Useful takeaways from this story.

The reinforcement learning (RL) ecosystem is rapidly adopting Ray as the unified compute runtime for complex post-training workflows.

As agentic and reasoning models evolve, a critical bottleneck has emerged: orchestrating secure, isolated sandboxes at scale to safely execute dynamic rollouts, code generation, and multi-turn tool...

Sandboxes as Ray Primitives Ray has become a common runtime for orchestrating post-training workloads.

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The useful part

The reinforcement learning (RL) ecosystem is rapidly adopting Ray as the unified compute runtime for complex post-training workflows. As agentic and reasoning models evolve, a critical bottleneck has emerged: orchestrating secure, isolated sandboxes at scale to safely execute dynamic rollouts, code generation, and multi-turn tool interactions. Sandboxes as Ray Primitives Ray has become a common runtime for orchestrating post-training workloads.

How it works

  • Frameworks including veRL, NeMo-RL, SLIME, MILES, and SkyRL already use Ray to coordinate distributed trainers, inference engines, rollout workers, and other components.
  • When we designed Ray Sandboxing, an important goal was to make it fit naturally into the existing Ray programming model rather than introduce a separate abstraction for isolated execution.

What to take from it

Today, in partnership with Anyscale, we are excited to introduce an experimental library for Ray that leverages agentic AI technologies being developed at Google to bring native, high-performance sandboxing directly into distributed Ray clusters.

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