Running Untrusted Code Securely

Allowing users to execute code on your servers is one of the most dangerous features you can build. Without proper isolation, a malicious user could read environment variables, execute shell commands, or consume all CPU resources.

Docker as a Sandbox

While Docker is not a true hypervisor, it can be heavily restricted to provide a solid layer of defense:

Memory Limits: --memory=128m
CPU Limits: --cpus=0.1
Network Isolation: --network=none
Read-only Root Filesystem: --read-only
No Privileges: Drop all capabilities.

For true multi-tenant untrusted execution, you should look beyond standard Docker and consider microVMs like Firecracker or kernel-level sandboxing like gVisor.

Loading Interactive Content...