News¶

LXCFS 7.0 LTS has been released ¶

29 avr. 2026

Introduction¶

The LXCFS team is pleased to announce the release of LXCFS 7.0 LTS!

This is the result of two years of work since the LXCFS 6.0 release and is the seventh LTS release for the LXCFS project. This release will be supported until June 2031.

Highlights¶

Support for PSI (Pressure Stall Information)¶

LXCFS now virtualizes the /proc/pressure files:

/proc/pressure/cpu
/proc/pressure/io
/proc/pressure/memory

zswap support¶

LXCFS now exposes zswap metrics in the virtualized /proc/meminfo.

Deprecated features¶

This release removes support for:
- FUSE2 (only FUSE3 from this point)
- CGroup V1 (CGroup V2 unified hierarchy only)
- Virtual cgroup tree (cgroup namespace is widely available)

This shouldn't cause any real issue as most Linux distributions have been running on CGroup V2 for a while now and they have also been typically defaulting to FUSE3.

PIDFD by default¶

We're now assuming kernel support for PIDFD with this now being used by default by LXCFS (was previously under --enable-pidfd).

Full changelog¶

Changelog

proc: checks system security policy before trying to get personalities
lxcfs/bindings: Refactor RUNTIME_PATH so that it can be overridden on startup
lxcfs/bindings: add a flag for overriding the runtime dir
github: add lxcfs live upgrade compatibility test
github: update coverity test to use Ubuntu 22.04
README.md: add info about how to collect a core dump
github: add ISSUE_TEMPLATE.md
github: add live upgrade test between stable-{5,6} branches
Add missing linux/limits.h include
lxcfs_read: Added LXCFS_TYPE macro to all FUSE filesystem calls
lxcfs: fix readdir for procfs subtree
tests: add proc readdir test
cgroups/cgfsng: improve swap accounting support detection
github: Bump Ubuntu version
github: Simplify tests workflow
github: Add arm64 tests
tests: Make sure to enable cpuset controller
github: Use shared logic
github: Update coverity workflow
github: Simplify build action
github: Update checkout to v4
github: Cleanup testsuite action
github: Improve progress reporting
proc_fuse: add psi(pressure stall information) procfs
meminfo: Add slab_reclaimable to MemAvailable
tests/test-read: call close(2) only if there is an fd
utils: fix wait_for_sock to use time_t instead of int
cpuset_parse: make a check for an empty string in cpu_in_cpuset()
utils: move strlcpy/strlcat helpers from cgroup_utils to utils
lxcfs: use strlcpy when handle runtime-dir parameter
proc_loadavg: Prevent integer overflow calculating the sleep interval
github: Bump actions/checkout to v5
github: Use Github Arm runners
proc_fuse: fix proc_stat_read reporting host cpu count under cgroup v2
cgroups: extract cgfsng_can_use_memory_feature() util function
cgroups: add zswap feature detection
lxcfs: add disable-zswap opt
bindings: add zswap feature detection
proc_fuse: add zswap information to /proc/meminfo
cgroups: replace dup() call with openat_safe()
lxcfs: use macro to generate liblxcfs call helpers
src/utils: fix in_same_namespace helper
proc_fuse: deduplicate read() handlers code for /proc/pressure files
bindings: add private_data field to struct file_info
lxcfs: wire up ->write callback for /proc
lxcfs: wire up ->poll callback for /proc
proc_fuse: move release/releasedir at the end
lxcfs: install noop signal handler for SIGRTMIN + 0
proc_fuse: add /proc/pressure/{cpu, io, memory} virtualization
meson: add "mocks" option for CI/testing purposes
github: enable mocks for CI builds
tests: add /proc/pressure/* virtualization tests
lxcfs: add enable-psi-poll cmdline option
cgroups/cgfsng: fix whitespace errors in __cg_mount_direct
cgroups/cgfsng: do not change host-wide cgroup2 superblock options
github: pass LIBFUSE env variable to upgrade tests
github: enable mocks for CI upgrade tests
meson: don't forget to set PSI trigger mocks for liblxcfstest
cgroups/cgfsng: check memory allocation in add_hierarchy
Fix issue where the pidfd_ functions are not detected during meson setup.
lxcfs: fix "Write to cache was truncated" on long-running / high-core-count systems
sysfs: fix duplicated /sys/devices/system/cpu/online
lxcfs: add .clang-format
CONTRIBUTING: add a note on AI generated code
github: switch to libfuse3 and drop libfuse2
lxcfs: drop libfuse2 support
lxcfs: remove libfuse2-specific code
tests: remove cgroupfs-related tests
lxcfs: remove cgroupfs support from hook
lxcfs: remove --enable-cgroup option support
lxcfs: nuke the cgroupfs code
lxcfs: make --enable-pidfd a default
Fix compiler warning.
lxcfs: remove test_cgroup
tests: remove test_readdir test
cgroups: remove pure cgroup1 and hybrid support
tests: remove cgroup1 support
tests: extend meminfo hierarchy test
tests: cleanup using shellcheck
tests/meminfo_hierarchy: ensure that swap total size is correct
tests: refactor meminfo_hierarchy test
tests: add cpuset hierarchy test
tests: add cpu cfs hierarchy test
tests: use SIGTERM instead of SIGKILL
github: add Codecov
github: drop cgroup1 related stuff
lxcfs: fix gettid on glibc < 2.30
tests: cover /proc/swaps in meminfo hierarchy test
cpuset_parse: constify return value of cpuset_nexttok
lxcfs: fix wrong cpu count when setting cfs in hierarchy
chore: Remove manual cpu.max and TODO in test script
Release LXCFS 7.0.0

Support and upgrade¶

LXCFS 7.0 will be supported until June 2031 and our current LTS release, LXCFS 6.0 will now switch to a slower maintenance pace, only getting critical bugfixes and security updates.

We strongly recommend all LXCFS users to plan an upgrade to the 7.0 branch.

Downloads¶

Main release tarball: lxcfs-7.0.0.tar.gz
GPG signature: lxcfs-7.0.0.tar.gz.asc

Contributors¶

The LXCFS 7.0 release was brought to you by a total of 16 contributors.

LXCFS 6.0.6 LTS has been released ¶

23 févr. 2026

Introduction¶

The LXCFS team is pleased to announce the release of LXCFS 6.0.6!

This is the sixth bugfix release for LXCFS 6.0 which is supported until June 2029.

Changes¶

The highlights for this release are:

Fix issue with CPU count in /proc/stat
Fix issue causing the cgroup2 mount flags to be changed on startup

The full list of commits is available below:

Detailed changelog

proc_fuse: fix proc_stat_read reporting host cpu count under cgroup v2
cgroups: extract cgfsng_can_use_memory_feature() util function
cgroups: replace dup() call with openat_safe()
src/utils: fix in_same_namespace helper
bindings: add private_data field to struct file_info
meson: add "mocks" option for CI/testing purposes
github: enable mocks for CI builds
lxcfs: use macro to generate liblxcfs call helpers
lxcfs: wire up ->write callback for /proc
lxcfs: wire up ->poll callback for /proc
proc_fuse: move release/releasedir at the end
cgroups/cgfsng: fix whitespace errors in __cg_mount_direct
cgroups/cgfsng: do not change host-wide cgroup2 superblock options
github: pass LIBFUSE env variable to upgrade tests
github: enable mocks for CI upgrade tests
meson: don't forget to set PSI trigger mocks for liblxcfstest
cgroups/cgfsng: check memory allocation in add_hierarchy

Support and upgrade¶

The LXCFS 6.0 branch is supported until June 2029.
Only bugfixes and security issues get included into the stable bugfix releases, so it's always safe and recommended to keep up and run the latest bugfix release.

Downloads¶

Main release tarball: lxcfs-6.0.6.tar.gz
GPG signature: lxcfs-6.0.6.tar.gz.asc

LXCFS 6.0.5 LTS has been released ¶

15 août 2025

Introduction¶

The LXCFS team is pleased to announce the release of LXCFS 6.0.5!

This is the fifth bugfix release for LXCFS 6.0 which is supported until June 2029.

Changes¶

There are no significant changes in this release, only a couple of minor changes to our CI scripts. We are still pushing a LXCFS update out to keep versions in sync between LXC, LXCFS and Incus, but this release is effectively identical to 6.0.4.

The full list of commits is available below:

Detailed changelog

github: Bump actions/checkout to v5
github: Use Github Arm runners

Support and upgrade¶

Downloads¶

Main release tarball: lxcfs-6.0.5.tar.gz
GPG signature: lxcfs-6.0.5.tar.gz.asc

Thanks¶

This LTS release update was made possible thanks to funding provided by the Sovereign Tech Fund (now part of the Sovereign Tech Agency).

[quote]
The Sovereign Tech Fund supports the development, improvement, and maintenance of open digital infrastructure. Its goal is to sustainably strengthen the open source ecosystem, focusing on security, resilience, technological diversity, and the people behind the code.
[/quote]

Find out more at: https://www.sovereign.tech

LXCFS 6.0.4 LTS has been released ¶

4 avr. 2025

Introduction¶

The LXCFS team is pleased to announce the release of LXCFS 6.0.4!

This is the fourth bugfix release for LXCFS 6.0 which is supported until June 2029.

Changes¶

Some of the highlights for this release are:

Properly handle SLAB reclaimable memory in meminfo
Handle empty cpuset strings
Fix potential sleep interval overflows

The full list of commits is available below:

Detailed changelog

meminfo: Add slab_reclaimable to MemAvailable
tests/test-read: call close(2) only if there is an fd
utils: fix wait_for_sock to use time_t instead of int
cpuset_parse: make a check for an empty string in cpu_in_cpuset()
utils: move strlcpy/strlcat helpers from cgroup_utils to utils
lxcfs: use strlcpy when handle runtime-dir parameter
proc_loadavg: Prevent integer overflow calculating the sleep interval

Support and upgrade¶

Downloads¶

Main release tarball: lxcfs-6.0.4.tar.gz
GPG signature: lxcfs-6.0.4.tar.gz.asc

Thanks¶

This LTS release update was made possible thanks to funding provided by the Sovereign Tech Fund (now part of the Sovereign Tech Agency).

Find out more at: https://www.sovereign.tech

LXCFS 6.0.3 LTS has been released ¶

19 déc. 2024

Introduction¶

The LXCFS team is pleased to announce the release of LXCFS 6.0.3!

This is the third bugfix release for LXCFS 6.0 which is supported until June 2029.

Changes¶

Some of the highlights for this release are:

Better detection of swap accounting support
Reworked testsuite including support for 64-bit Arm

The full list of commits is available below:

Detailed changelog

lxcfs_read: Added LXCFS_TYPE macro to all FUSE filesystem calls
lxcfs: fix readdir for procfs subtree
tests: add proc readdir test
cgroups/cgfsng: improve swap accounting support detection
github: Bump Ubuntu version
github: Simplify tests workflow
github: Add arm64 tests
tests: Make sure to enable cpuset controller
github: Use shared logic
github: Update coverity workflow
github: Simplify build action
github: Update checkout to v4
github: Cleanup testsuite action
github: Improve progress reporting

Support and upgrade¶

The LXCFS 6.0 branch is supported until June 2029.
Only bugfixes and securitiy issues get included into the stable bugfix releases, so it's always safe and recommended to keep up and run the latest bugfix release.

Downloads¶

Main release tarball: lxcfs-6.0.3.tar.gz
GPG signature: lxcfs-6.0.3.tar.gz.asc

Thanks¶

This LTS release update was made possible thanks to funding provided by the Sovereign Tech Fund (now part of the Sovereign Tech Agency).

Find out more at: https://www.sovereign.tech

News¶

LXCFS 7.0 LTS has been released¶

Introduction¶

Highlights¶

Support for PSI (Pressure Stall Information)¶

zswap support¶

Deprecated features¶

PIDFD by default¶

Full changelog¶

Support and upgrade¶

Downloads¶

Contributors¶

LXCFS 6.0.6 LTS has been released¶

Introduction¶

Changes¶

Support and upgrade¶

Downloads¶

LXCFS 6.0.5 LTS has been released¶

Introduction¶

Changes¶

Support and upgrade¶

Downloads¶

Thanks¶

LXCFS 6.0.4 LTS has been released¶

Introduction¶

Changes¶

Support and upgrade¶

Downloads¶

Thanks¶

LXCFS 6.0.3 LTS has been released¶

Introduction¶

Changes¶

Support and upgrade¶

Downloads¶

Thanks¶

Older news¶

LXCFS 7.0 LTS has been released ¶

LXCFS 6.0.6 LTS has been released ¶

LXCFS 6.0.5 LTS has been released ¶

LXCFS 6.0.4 LTS has been released ¶

LXCFS 6.0.3 LTS has been released ¶