Virtualizing the Filesystem
Lxcfs (LXC filesystem) is a FUSE-based filesystem utilized primarily by Linux Containers (LXC and LXD). Its main job is to provide containers with a virtualized view of certain system files, such as /proc/cpuinfo, /proc/meminfo, and /sys. This ensures that a container running inside a host machine sees only its allocated resources (e.g., 2 CPU cores and 1GB of RAM) rather than the total resources of the massive host server.
If you are running a standard Ubuntu server that does not host LXC or LXD containers (for instance, a server strictly used as a database, a standard web host, or even a Docker host, since Docker handles resource isolation differently), the lxcfs daemon is unnecessary overhead. Disabling it reduces complexity, saves a tiny bit of RAM, and eliminates a background process mounting FUSE filesystems you aren’t using.
How to Disable the LXCFS Service
You can stop and disable the daemon using standard systemd commands.
- Open your Ubuntu Terminal or connect to the server via SSH.
- Stop the running service immediately:
sudo systemctl stop lxcfs.service- Disable the service to prevent it from launching automatically at the next boot:
sudo systemctl disable lxcfs.service- (Optional) If you are absolutely certain you will never use LXC on this server, you can uninstall the package entirely to free up disk space:
sudo apt-get remove --purge lxcfsThe daemon is now disabled. Your host system will continue to operate normally, as lxcfs only affects the virtualized filesystems provided to guest containers.