Unprivileged LXC + Docker: The runc Sysctl Permission Trap

📰 Dev.to · Guatu

Learn to fix silent failures of sysctl settings when running Docker inside unprivileged Proxmox LXC containers

advanced Published 5 May 2026
Action Steps
  1. Run Docker inside an unprivileged Proxmox LXC container to identify the issue
  2. Check sysctl settings to see if they are being applied correctly
  3. Configure runc to allow sysctl settings to be applied
  4. Test the configuration to ensure sysctl settings are working as expected
  5. Apply the fix to all relevant containers to prevent future issues
Who Needs to Know This

DevOps teams and system administrators who use Proxmox LXC containers and Docker will benefit from this knowledge to troubleshoot and resolve issues with sysctl settings

Key Insight

💡 Unprivileged LXC containers can cause sysctl settings to fail silently when running Docker, but this can be fixed by configuring runc

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🚨 Fix silent failures of sysctl settings in Docker inside unprivileged Proxmox LXC containers 🚨

Key Takeaways

Learn to fix silent failures of sysctl settings when running Docker inside unprivileged Proxmox LXC containers

Full Article

Fixing the silent failure of sysctl settings when running Docker inside unprivileged Proxmox LXC containers.
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