# Fedora calls for testing of Rust-rewritten conmon v3 container monitor

> **Key takeaway:** Fedora and Podman teams are organizing a test week from October 12-18, 2026 to validate conmon v3, a Rust-based rewrite of the container monitor that replaces the C implementation.

**Published:** 2026-10-07T16:25:50+00:00 
**Source:** Fedora Magazine 
**Category:** distro-news 
**Canonical URL:** https://fosswire.org/news/fedora-calls-for-testing-of-rust-rewritten-conmon-v3-contain.html 

## Summary
The Podman and Fedora Quality teams are asking users to test conmon v3 during a dedicated test week. The new version rewrites the container monitor in Rust to reduce memory safety errors and improve the logging backend interface. Testers can install conmon-v3 via dnf and select it system-wide through a containers.conf drop-in file. The teams want feedback on interactive sessions, Quadlet services, logging behavior, and runtime compatibility across different setups.

## What to test and how to switch
- Install with `sudo dnf install conmon-v3`, then activate via `/etc/containers/containers.conf.d/99-conmon-v3.conf` with `conmon_path = ["/usr/bin/conmon-v3"]`
- Verify with `podman info` that conmon path is `/usr/bin/conmon-v3` and version starts with 3
- Running containers keep their existing monitor; only new containers use v3
- Key test areas: interactive shell resize/attach/detach, `podman exec` output and exit status, file and journald logs with large output and unterminated lines, Quadlet/systemd service lifecycle, rootless vs rootful, crun vs runc
- Watch for hangs, missing output, incorrect exit codes, unexpected CPU usage, or any divergence from conmon v2 behavior

## Why it matters
A successful Rust rewrite of conmon could improve memory safety for a core component used by millions of Podman containers, while the shared logging interface may make it easier to add new log backends in the future.