Home Assistant Supervisor Issues — Complete Guide

In this tutorial, you'll learn about Home Assistant Supervisor Issues. We cover key concepts, practical examples, and best practices.

Hook

You open the Home Assistant Supervisor panel and see "Supervisor is not running" or "Failed to load Supervisor." The Home Assistant web UI works, but you cannot install add-ons, manage backups, or update the system.

The Wrong Way

Restarting the entire host machine or reinstalling Home Assistant OS because the Supervisor shows "unhealthy" wastes time — a simple container restart often fixes it.

# BAD: Full system reboot when only Supervisor needs restarting
sudo reboot

System rebooted — Home Assistant started
Supervisor: still "not running"

A reboot did not fix Supervisor because the underlying issue (Docker socket permissions or network) persisted.

The Right Way

Check the Supervisor logs and restart the Supervisor container.

# 1. Check Supervisor logs
docker logs hassio_supervisor --tail 50

[ERROR] Supervisor: API not responding
[ERROR] Docker: Failed to connect to Docker daemon

The Supervisor cannot connect to the Docker socket. Fix permissions:

# 2. Check Docker socket permissions
ls -la /var/run/docker.sock

srw-rw---- 1 root docker 0 Jun 24 10:00 /var/run/docker.sock

# 3. Ensure the Supervisor container has access
# If running in Docker, the container needs /var/run/docker.sock mounted
docker inspect hassio_supervisor | grep -A 5 '"Binds"'

# 4. Restart the Supervisor
docker restart hassio_supervisor

Supervisor restarting...
Supervisor started — status: healthy

If Supervisor still fails, check for disk space:

df -h
# Supervisor needs at least 1 GB free on the root partition

Prevention

• Keep at least 10% disk space free on the root partition.
• Ensure the Docker socket is properly mounted for the Supervisor container.
• Do not manually modify Supervisor's Docker container or its volumes.
• Use Home Assistant OS or a supported installation method for automatic Supervisor management.
• Monitor Supervisor health via the web UI or API.

Advanced Troubleshooting

Check the Logs

Most TOOL errors are logged to stdout or a dedicated log file. Check your logs first:

# Check system logs
journalctl -u tool --since "1 hour ago"

# Or check the application log
tail -50 ~/.tool/logs/error.log

Test with a Minimal Example

Create the simplest possible tool configuration to verify the base setup works:

tool --version
tool --help

If the minimal test passes, add configuration options one at a time until you find the breaking change.

Common Configuration Mistakes

• Using the wrong file path or URL in configuration
• Forgetting to restart TOOL after changing config files
• Mixing tabs and spaces in YAML configuration files
• Setting incorrect permissions on configuration directories

When to Reinstall

If none of the above resolves the issue, consider a clean reinstall:

# Backup your configuration
cp -r ~/.tool ~/.tool.bak

# Remove and reinstall
# Follow the official TOOL installation guide

This ensures you start from a known good state and can isolate the issue.

Common Mistakes with assistant supervisor

1. Overlapping type class instances that cause GHC to reject the program with ambiguous dispatch errors
2. Non-exhaustive pattern matches that compile with warnings then crash at runtime
3. Misunderstanding that String is [Char] with poor performance for large text operations

These mistakes appear frequently in real-world HOME code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ

DodaTech — Supervisor supervised, always healthy.