LXCFS

https://linuxcontainers.org/lxcfs/
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LXCFS is a userspace filesystem that provides cgroup-aware proc files and container-aware cgroup...
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### Build and run LXCFS from source

Source: https://linuxcontainers.org/lxcfs/getting-started

Commands to clone the repository, compile the source, and mount the filesystem at /var/lib/lxcfs.

```bash
git clone git://github.com/lxc/lxcfs
cd lxcfs
./bootstrap.sh
./configure
make
sudo mkdir -p /var/lib/lxcfs
sudo ./lxcfs -s -f -o allow_other /var/lib/lxcfs/
```

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### View LXCFS command line usage

Source: https://linuxcontainers.org/lxcfs/news/2020_03_06_23_03.html

Displays the available command-line options and usage syntax for the lxcfs binary.

```text
Usage: lxcfs <directory>

lxcfs set up fuse- and cgroup-based virtualizing filesystem

Options :
  -d, --debug          Run lxcfs with debugging enabled
  --enable-cfs        Enable cpu virtualization via cpu shares
  -f, --foreground     Run lxcfs in the foreground
  -n, --help           Print help
  -l, --enable-loadavg Enable loadavg virtualization
  -o                   Options to pass directly through fuse
  -p, --pidfile=FILE   Path to use for storing lxcfs pid
                       Default pidfile is /run/lxcfs.pid
  -u, --disable-swap   Disable swap virtualization
  -v, --version        Print lxcfs version
  --enable-pidfd       Use pidfd for process tracking
```

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### Configure LXCFS Build with PAM disabled

Source: https://linuxcontainers.org/lxcfs/news/2016_06_28_00_00.html

Use the --with-pamdir=none option to prevent the pam/ directory from being built during LXCFS compilation when PAM support is not desired.

```bash
configure --with-pamdir=none
```

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### Libpam_cgfs: Avoid creating new paths under /user.slice

Source: https://linuxcontainers.org/lxcfs/news/2016_06_28_00_00.html

This fix in libpam_cgfs prevents the creation of new paths when operating under /user.slice/user-$uid.slice, ensuring correct behavior for user sessions.

```c
libpam_cgfs: Don't create new path if we are under /user.slice/user-$uid.slice
```

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### Clone LXCFS repository

Source: https://linuxcontainers.org/lxcfs/contribute

Use this command to retrieve the current development version of LXCFS from GitHub.

```bash
git clone git://github.com/lxc/lxcfs
```
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