Re: NeuroFedora review swaps
by Ankur Sinha
On Mon, Jan 28, 2019 15:47:00 +0100, J. Scheurich wrote:
>
> > I'd like to get this package reviewed please:
> >
> > - python-pyscaffold: https://bugzilla.redhat.com/show_bug.cgi?id=1669913#
> >
> > Would anyone like to swap reviews?
>
> I would review it for wdune sponsoring.
Sorry---I'm not current with the wdune scenario. I assumed you meant
that you'd review it unofficially as part of the work to get sponsored
to the packagers group:
https://fedoraproject.org/wiki/How_to_get_sponsored_into_the_packager_gro...
I'm not a sponsor yet so I cannot sponsor you to the group myself, but
once you've done a few reviews, a sponsor will be happy to take a look
at them and guide you through the sponsorship process.
If you've submitted a review ticket for wdune already, I will be happy
to review it and provide comments.
--
Thanks,
Regards,
Ankur Sinha
https://ankursinha.in
Time zone: Europe/London
1 week
The future of legacy BIOS support in Fedora.
by Jóhann B. Guðmundsson
Given Hans proposal [1] introduced systemd/grub2/Gnome upstream changes
it beg the question if now would not be the time to stop supporting
booting in legacy bios mode and move to uefi only supported boot which
has been available on any common intel based x86 platform since atleast
2005.
Now in 2017 Intel's technical marketing engineer Brian Richardson
revealed in a presentation that the company will require UEFI Class 3
and above as in it would remove legacy BIOS support from its client and
datacenter platforms by 2020 and one might expect AMD to follow Intel in
this regard.
So Intel platforms produced this year presumably will be unable to run
32-bit operating systems, unable to use related software (at least
natively), and unable to use older hardware, such as RAID HBAs (and
therefore older hard drives that are connected to those HBAs), network
cards, and even graphics cards that lack UEFI-compatible vBIOS (launched
before 2012 – 2013) etc.
This post is just to gather feed back why Fedora should still continue
to support legacy BIOS boot as opposed to stop supporting it and
potentially drop grub2 and use sd-boot instead.
Share your thoughts and comments on how such move might affect you so
feedback can be collected for the future on why such a change might be
bad, how it might affect the distribution and scope of such change can
be determined for potential system wide proposal.
Regards
Jóhann B.
1.
https://fedoraproject.org/wiki/Changes/CleanupGnomeHiddenBootMenuIntegration
3 months
Reproducible builds/bootstrap
by Pablo Greco
I'm starting to work on a project to make Fedora fully reproducible and bootstrappable from scratch.
I know it is a long term plan and still working on the steps, but it would be good to know the current status, if there is an internal interest in this, if someone is already working (or planning to).
Thanks for the info.
Pablo
3 months, 1 week
Fedora 33 System-Wide Change proposal: systemd-resolved
by Ben Cotton
https://fedoraproject.org/wiki/Changes/systemd-resolved
== Summary ==
Enable systemd-resolved by default. glibc will perform name resolution
using nss-resolve rather than nss-dns.
== Owner ==
* Name: [[User:catanzaro| Michael Catanzaro]]
* Email: <mcatanzaro(a)redhat.com>
== Detailed Description ==
We will enable systemd-resolved by default.
# We will change the
[https://src.fedoraproject.org/rpms/fedora-release/blob/f4cc5b6ce095bb4233...
fedora-release presets] to enable systemd-resolved instead of disable
it.
# systemd-libs currently has
[https://src.fedoraproject.org/rpms/systemd/blob/bb79fb73875f8e71841a1ee8e...
a %post scriplet] to enable nss-myhostname and nss-systemd by either
(a) modifying authselect's user-nsswitch.conf template, if authselect
is in use, or (b) directly modifying /etc/nsswitch.conf otherwise. We
will work with the systemd maintainers to enable nss-resolve here as
well.
# We will work with the authselect maintainers to update authselect's
minimal and nis profiles to enforce nss-resolve. These profiles modify
the hosts line of /etc/resolv.conf. (By default, Fedora uses
authselect's sssd profile, which does not modify the hosts line and
therefore does not have this problem.)
# We will remove our downstream patch to systemd that prevents systemd
from symlinking /etc/resolv.conf to
/run/systemd/resolve/stub-resolv.conf on new installs. For system
upgrades, a systemd-libs %post scriptlet will be used to reassign the
symlink during upgrade. Upon detecting this symlink, NetworkManager
will automatically enable its systemd-resolved support and configure
split DNS as appropriate.
systemd-resolved has been enabled by default in Ubuntu since Ubuntu
16.10, but please note we are doing this differently than Ubuntu has.
Ubuntu does not use nss-resolve. Instead, Ubuntu uses the traditional
nss-dns provided by glibc upstream, so glibc on Ubuntu continues to
read /etc/resolv.conf, as is traditional. This extra step is not
useful and not recommended by upstream. We want to follow upstream
recommendations in using nss-resolve instead.
If you do not wish to use systemd-resolved, then manual intervention
will be required to disable it:
* Modify /etc/authselect/user-nsswitch.conf and remove `resolve
[!UNAVAIL=return]` from the hosts line. Run `authselect
apply-changes`. (If you have disabled authselect, then edit
/etc/nsswitch.conf directly.)
* Disable and stop systemd-resolved.service.
* Restart the NetworkManager service. NetworkManager will then create
a traditional /etc/resolv.conf. (If you are not using NetworkManager,
you may create your own /etc/resolv.conf.)
== Benefit to Fedora ==
=== Standardization ===
Fedora will continue its history of enabling new systemd-provided
services whenever it makes sense to do so. Standardizing on upstream
systemd services is beneficial to the broader Linux ecosystem in
addition to Fedora, since standardizing reduces behavior differences
between different Linux distributions. Sadly, Fedora is no longer
leading in this area. Ubuntu has enabled systemd-resolved by default
since Ubuntu 16.10, so by the time Fedora 33 is released, we will be
three years behind Ubuntu here.
=== resolvectl ===
`resolvectl` has several useful functions (e.g. `resolvectl status` or
`resolvectl query`) that will be enabled out-of-the-box.
=== Caching ===
systemd-resolved caches DNS queries for a short while. This can
[https://gitlab.gnome.org/GNOME/glib/-/merge_requests/682#note_441846
dramatically] improve performance for applications that do not already
manually cache their own DNS results. (Generally, only web browsers
bother with manually caching DNS results.)
=== Split DNS ===
When systemd-resolved is enabled, users who use multiple VPNs at the
same time will notice that DNS requests are now sent to the correct
DNS server by default. Previously, this scenario would result in
embarrassing "DNS leaks" and, depending on the order that the VPN
connections were established, possible failure to resolve private
resources. These scenarios will now work properly. For example,
consider the scenario of Distrustful Denise, who (quite reasonably)
does not trust her ISP. Denise uses a public VPN service,
public-vpn.example.com, to hide her internet activity from her ISP,
but she also needs to use her employer's corporate VPN,
corporation.example.com, in order to access internal company resources
while working from home. Using the Network panel in System Settings,
Denise has configured her employer's VPN to "use this connection only
for resources on its network." Distrustful Denise expects that her
employer's VPN will receive all traffic for corporation.example.com,
and no other traffic. And while this mostly works in Fedora 32, she
discovers that it does not work properly for DNS:
* If Denise connects to public-vpn.example.com first and
corporation.example.com second, she is unable to access internal
company resources. All DNS requests are sent to
public-vpn.example.com's DNS server, so she is unable to resolve names
for internal company websites.
* If Denise connects to corporation.example.com first and
public-vpn.example.com second, then she is able to access internal
company resources. However, it only works because ''all'' her DNS
requests are sent to corporation.example.com's DNS server. Sadly for
Distrustful Denise, her employer discovers that she has been making
some embarrassing DNS requests that she had expected to go through
public-vpn.example.com instead.
Whichever VPN Denise connects to first receives all DNS requests
because glibc's nss-dns module is not smart enough to split the
requests. /etc/resolv.conf is just a list of DNS servers to try in
order, and NetworkManager has no plausible way to decide which to list
first, because both ways are broken, so it just prefers whichever was
connected first. And if one server fails to respond, then the next
server in the list will be tried, likely resulting in a DNS leak. In
contrast, when systemd-resolved is enabled, it will send each DNS
request only to the correct DNS server. The DNS server that will be
used for each tun interface can be inspected using the resolvectl
tool.
Migrating away from /etc/resolv.conf will also avoid an annoying
footgun with this legacy file: only the first three listed nameservers
are respected. All further nameservers are silently ignored.
NetworkManager adds a warning comment when writing more than three
nameservers to this file, but it cannot do any better than that.
=== DNS over TLS ===
systemd-resolved supports DNS over TLS (different from DNS over
HTTPS). Although this feature will not initially be enabled by
default, using systemd-resolved will enable us to turn on DNS over TLS
in a future Fedora release, providing improved security if the user's
DNS server supports DNS over TLS.
== Scope ==
* Proposal owners: We will update Fedora presets to enable
systemd-resolved by default.
* Other developers: This change requires coordination with the systemd
and authselect maintainers.
* Release engineering: [https://pagure.io/releng/issue/9367 #9367]
* Policies and guidelines: none required
* Trademark approval: N/A (not needed for this Change)
== Upgrade/compatibility impact ==
systemd-resolved will be enabled automatically when upgrading to
Fedora 33. After upgrade, /etc/resolv.conf will be managed by systemd
and symlinked to /run/systemd/resolve/stub-resolv.conf. '''glibc will
no longer look at /etc/resolv.conf when performing name resolution.'''
Instead, glibc will communicate directly with systemd-resolved via
nss-resolve. systemd adds a large warning comment to the top of
/etc/resolv.conf to warn system administrators that changes to this
file will be ignored; however, scripts that edit this file manually
will break. Because this file is usually managed by NetworkManager,
impact to Fedora users will be limited to users who have manually
disabled NetworkManager; such users are expected to be experienced
system administrators who should be comfortable adapting to the change
(or disabling systemd-resolved).
Any applications that bypass glibc and read /etc/resolv.conf directly
will still work because /etc/resolv.conf will point to
systemd-resolved's stub resolver running on 127.0.0.53. Nevertheless,
/etc/resolv.conf is provided only for compatibility purposes, and
applications should prefer to use either glibc or the systemd-resolved
D-Bus API instead; see systemd-resolved(8) for details.
In short, '''applications that read /etc/resolv.conf will continue to
work as before.''' Applications that write to it will no longer work
as expected, but this only previously worked if NetworkManager is
disabled, a non-default configuration. It remains possible to disable
systemd-resolved if desired. Otherwise, any custom system
administration scripts that manage /etc/resolv.conf will need to be
updated.
=== DNSSEC ===
systemd-resolved's DNSSEC support is known to cause compatibility
problems with certain network access points. Per recommendation from
the systemd developers, we will change the default value of this
setting in Fedora from the upstream default `DNSSEC=allow-downgrade`
to `DNSSEC=no` by building systemd with the build option
`-Ddefault-dnssec=no`. The upstream default attempts to use DNSSEC if
it is working, but automatically disable it otherwise, allowing
man-in-the-middle attackers to disable DNSSEC. Sadly, even the
allow-downgrade setting suffers known compatibility problems. Because
Fedora is not prepared to handle an influx of DNSSEC-related bug
reports, we will disable this feature altogether. We anticipate that
enabling DNSSEC by default will not be possible in the foreseeable
future, or perhaps ever. Instead, enabling DNS over TLS (when
supported by the DNS server) seems likely in the near future.
=== Multicast DNS ===
systemd-resolved's multicast DNS support conflicts with Avahi. Per
recommendation from the systemd developers, we will change the default
value of this setting in Fedora from the upstream default
`MulticastDNS=yes` to `MulticastDNS=resolve`. Multicast DNS resolving
will be enabled, but responding will be disabled. This will require
adding a new systemd build option to control the default value of the
MulticastDNS setting, similar to the existing `default-dnssec` and
`default-dns-over-tls` build options.
== How To Test ==
Load any website in a web browser. If you succeed, then name
resolution probably works.
Try using `resolvectl status` and, for example, `resolvectl query
fedoraproject.org`, to see how they work and sanity-check their
output.
Users who use multiple VPNs at the same time are encouraged to test
DNS in a multiple VPN scenario, to ensure that DNS requests are sent
to the expected DNS server.
== User Experience ==
See the Benefit to Fedora section, above, for direct benefits to users
who use multiple VPNs at the same time.
Users will be able to use the resolvectl tool and the functionality it provides.
/etc/resolv.conf will now be managed by systemd rather than by
NetworkManager. As before, this file must not be modified directly
when it is managed.
== Dependencies ==
In Fedora, /etc/nsswitch.conf is managed by authselect. By default,
authselect uses the sssd profile to generate configuration compatible
with sssd. In this mode of operation, it does not modify the hosts
line in /etc/nsswitch.conf. This is also true if using the winbind
profile instead of the sssd profile. However, authselect's minimal and
nis profiles do modify the hosts line. These authselect profiles must
be updated to enable nss-resolved. If you are using authselect in one
of these modes, it will not be possible to cleanly disable
systemd-resolved because the hosts line in /etc/nsswitch.conf will be
clobbered whenever 'authselect apply-changes' is run. If you wish to
disable systemd-resolved and you are using authselect in one of these
modes, then you should stop using authselect. This is not expected to
cause many problems because virtually all Fedora users will be using
the default sssd profile.
We do not need to directly make any changes to the /etc/nsswitch.conf
shipped by glibc. Changes will be applied in the systemd-libs %post
scriptlet.
== Contingency Plan ==
The contingency plan, in the unlikely event of unexpected problems, is
simply to revert any changes and not enable systemd-resolved.
* Contingency deadline: beta freeze
* Blocks release? No
* Blocks product? No
== Documentation ==
* systemd-resolved is documented in several manpages: resolvectl(1),
resolved.conf(5), nss-resolve(8), systemd-resolved(8).
* [https://wiki.archlinux.org/index.php/Systemd-resolved Arch Wiki
documentation]
* [https://wiki.gnome.org/Projects/NetworkManager/DNS NetworkManager
DNS documentation]
== Release Notes ==
systemd-resolved is now enabled by default. systemd-resolved provides
a system-level DNS cache that can substantially improve performance
for applications that do not cache their own DNS results, allows
correct handling of split DNS scenarios such as when multiple VPNs are
in use, and will allow Fedora to enable DNS over TLS in the future.
/etc/resolv.conf will now be managed by systemd-resolved rather than
by NetworkManager. /etc/resolv.conf will no longer be read when
performing name resolution using glibc; however, it is still provided
for compatibility with applications that manually read this file to
perform name resolution. Writing to /etc/resolv.conf will no longer
work as expected.
--
Ben Cotton
He / Him / His
Senior Program Manager, Fedora & CentOS Stream
Red Hat
TZ=America/Indiana/Indianapolis
3 months, 1 week
Fedora 33 System-Wide Change proposal: Make nano the default editor
by Ben Cotton
https://fedoraproject.org/wiki/Changes/UseNanoByDefault
== Summary ==
Let's make Fedora more approachable, by having a default editor that
doesn't require specialist knowledge to use.
== Owner ==
* Name: [[User:chrismurphy| Chris Murphy]]
* Email: chrismurphy(a)fedoraproject.org
== Detailed Description ==
Users are exposed to the default editor when they use commands that
call it. The main example here is something like <code>git
commit</code>.
Fedora does not currently have a default terminal text editor, because
the $EDITOR environment variable is unset by default. But a common
scenario where users wind up in a terminal text editor is when using
'git commit'. By default, git picks vi. You need to spend time
learning how to use it, for even basic editing tasks. This increases
the barrier to entry for those who are switching to Fedora and don't
know how to use vi. It also makes things hard for those who don't
particularly want to learn how to use vi. (These arguments would apply
just as well if git picked Vim. vi is like hard mode for Vim, with
fewer features, missing syntax highlighting, and no indication of what
mode you are in. Even Vim users may feel lost and bewildered when
using vi.)
In contrast, Nano offers the kind of graphical text editing experience
that people are used to, and therefore doesn't require specialist
knowledge to use. It is already installed across most Fedora Editions
and Spins. This proposal will make Nano the default editor, while
continuing to install <code>vim-minimal</code> (which provides vi, but
not Vim). People will still be able to call <code>vi</code> if they
want to edit a file. It will also obviously be possible to change the
default editor to vi or Vim, for those who want it.
Why make Nano default and vi optional, rather than the other way
round? Because Nano is the option that everyone can use.
== Feedback ==
Pending ...
== Benefit to Fedora ==
* Makes the default editor across all of Fedora more approachable.
* Nano is also mostly self-documenting, by displaying common keyboard
shortcuts on-screen.
* More in line with the default editor of other distributions.
== Scope ==
* Proposal owners:
** Modify comps to include nano Fedora wide.
** Create a new subpackage of <code>nano</code>, called
<code>nano-editor</code>.
** <code>nano-editor</code> to include
<code>/usr/lib/environment.d/10-nano.conf</code>, which sets
<code>$EDITOR</code> to <code>nano</code>.
With this approach, if <code>nano</code> is uninstalled, the
configuration will be removed with it. At the same time, installing
nano on its own won't install the conf.
* Other developers: N/A
* Release engineering: [https://pagure.io/releng/issue/9522 #9522]
* Policies and guidelines: N/A
* Trademark approval: N/A
== Upgrade/compatibility impact ==
Will not apply to upgrades.
== How To Test ==
Run <code>export EDITOR="/usr/bin/nano"</code>.
== User Experience ==
Users running <code>git commit</code> will be able to just type their
commit message, rather than having to learn about insert mode, and
they'll be able to cut and paste without having to learn special
shortcuts.
== Dependencies ==
No additional dependencies are required.
== Contingency Plan ==
The contingency plan is to revert the change by removing the
<code>nano-editor</code> package.
* Contingency deadline: probably the beta? It's an easy change to revert.
* Blocks release? If the change breaks the redirection to an editor,
it should block the release. However, this is unlikely.
* Blocks product? Potentially all.
== Documentation ==
As part of this change, it would be good to add instructions for
changing the default editor to the
[https://docs.fedoraproject.org/en-US/quick-docs/ quick docs].
--
Ben Cotton
He / Him / His
Senior Program Manager, Fedora & CentOS Stream
Red Hat
TZ=America/Indiana/Indianapolis
3 months, 3 weeks
Enable EarlyOOM on Fedora KDE - Fedora 33 Self-Contained Change proposal
by Ben Cotton
https://fedoraproject.org/wiki/Changes/KDEEarlyOOM
== Summary ==
As [[Changes/EnableEarlyoom|Fedora Workstation did in F32]], install
earlyoom package, and enable it by default. If both RAM and swap go below
10% free, earlyoom issues SIGTERM to the process with the largest
oom_score. If both RAM and swap go below 5% free, earlyoom issues SIGKILL
to the process with the largest oom_score. The idea is to recover from out
of memory situations sooner, rather than the typical complete system hang
in which the user has no other choice but to force power off.
== Owner ==
* Name: [[User:bcotton|Ben Cotton]]
* Email: bcotton(a)redhat.com
== Detailed Description ==
Shamelessly copied from Workstation, which did it in the last release:
Certain workloads have heavy memory demands, quickly consume all of RAM,
and start to heavily page out to swap. (Heavy paging, is often called "swap
thrashing" for added descriptive effect, probably because it's noticeable
and annoying). Incidental swap usage is a good thing, it frees up memory
for active pages used by a process. Heavy swap usage quickly leads to a
very negative UX, because it's slow, even on modern SSDs. Due to installer
defaults, the swap partition is made the same size as available memory (at
install time), which can be huge. This just extends swap thrashing time.
On the one hand, we want this resource hungry job to complete. On the other
hand, we want our system to be responsive while that other work is going
on. But once the GUI stutters or even comes to an apparent stand still
(hang), we're really wishing the kernel oom-killer would kick in and free
up memory, so we can start over (maybe using memory or thread limiting
options - which arguably should be more intelligently figured out, and that
too is a work in progress but beyond the scope of this feature).
However, once in a heavy swap scenario, it's relatively common the system
gets stuck in it, where GUI interactivity is terrible to non-existent, and
also the kernel oom-killer doesn't trigger. From a certain point of view,
this is working as intended. The kernel oom-killer is concerned about
keeping the kernel running. It's not at all concerned about user space
responsiveness.
Instead of the system becoming completely unresponsive for tens of minutes,
hours or days, this feature expects that an offending process (determined
by oom_score, same as the kernel oom-killer) will be killed off within
seconds or a few minutes.
== Benefit to Fedora ==
KDE users will be able to take advantage of the benefits Workstation users
got from enabling earlyOOM in Fedora 32:
* improved user experience by more quickly regaining control over one's
system, rather than having to force power off in low-memory situations
where there's aggressive swapping. Once a system becomes unresponsive, it's
completely reasonable for the user to assume the system is lost, but that
includes high potential for data loss.
* reducing forced poweroff as the main work around will increase data
collection, improving understanding of low memory situations and how to
handle them better
* earlyoom first sends SIGTERM to the chosen process, so it has a chance of
a proper shutdown, unlike the kernel's oom-killer
== Scope ==
* Proposal owners:
** Modify {{code|
https://pagure.io/fedora-comps/blob/master/f/comps-f33.xml.in}} to include
earlyoom package for in {{code|kde-desktop}} section.
** Add {{code|
https://src.fedoraproject.org/rpms/fedora-release/blob/master/f/80-kde.pr...
to include:
<pre>
# enable earlyoom by default on KDE
enable earlyoom.service
</pre>
* Other developers: None, unless KDE-based Spins/Labs want to opt out
* Release engineering: N/A
* Policies and guidelines: N/A
* Trademark approval: N/A
== Upgrade/compatibility impact ==
earlyoom.service will be enabled on upgrade. An upgraded system should
exhibit the same behaviors as a newly-installed system.
== How To Test ==
* Fedora 31/32 KDE users can test today:
** {{code|sudo dnf install earlyoom}}
** {{code|sudo systemctl enable --now earlyoom}}
And then attempt to cause an out of memory situation. Examples:
** {{code|tail /dev/zero}}
** https://lkml.org/lkml/2019/8/4/15
== User Experience ==
earlyoom sends SIGTERM to processes based on oom_score when both memory and
swap have less than 10% free and SIGKILL when below 5%.
== Dependencies ==
None
== Contingency Plan ==
* Contingency mechanism: (What to do? Who will do it?) Owner reverts
changes
* Contingency deadline: Final freeze
* Blocks release? No
== Documentation ==
* {{code|man earlyoom}}
* https://github.com/rfjakob/earlyoom
* https://www.kernel.org/doc/gorman/html/understand/understand016.html
== Release Notes ==
The earlyoom service is now enabled by default in Fedora KDE.
The earlyoom service monitors system memory usage. If free memory falls
below a set limit, earlyoom terminates an appropriate process to free up
memory. As a result, the system does not become unresponsive for long
periods of time in low-memory situations.
The following is the default earlyoom configuration:
* If both RAM and swap go below 10% free, earlyoom sends the SIGTERM signal
to the process with the largest oom_score.
* If both RAM and swap go below 5% free, earlyoom sends the SIGKILL signal
to the process with the largest oom_score.
For more information, see the earlyoom man page.
--
Ben Cotton
He / Him / His
Senior Program Manager, Fedora & CentOS Stream
Red Hat
TZ=America/Indiana/Indianapolis
4 months
Searching a new home for my packages
by Thomas Spura
Hi all,
unfortunately, I don't find much time anymore to look for my packages ..
Due to that, I would like to step down as the primary maintainer and
am searching for a new home for my packages!
On most of them, I am co-maintainer and the following are the ones, where I
am maintainer (and hope I didn't forget one, if so, please let me know):
- python-jupyter-client
- python-jupyter-core
- python-matplotlib
- python-tornado
- ipython
- mpi4py
- php-zmq
- pynac
Feel free to let me know, if you are interested in taking any of those
packages.
Best,
Thomas
--
Fedora: https://fedoraproject.org/wiki/User:Tomspur
4 months, 2 weeks
NetworkManager keyfile instead of ifcfg-rh - Fedora 33 System-Wide
Change proposal
by Ben Cotton
https://fedoraproject.org/wiki/Changes/NetworkManager_keyfile_instead_of_...
== Summary ==
Change the default settings plugin of NetworkManager so that new
profiles will be created in keyfile format instead of ifcfg-rh format.
== Owner ==
* Name: [[User:Thaller| Thomas Haller]]
* Email: <thaller(a)redhat.com>
== Detailed Description ==
NetworkManager supports settings plugins to persist connection
profiles to disk. There is the native ''keyfile'' format and the
Fedora/RHEL specific ''ifcfg-rh'' format originally from initscripts.
The keyfile plugin is always enabled in NetworkManager and can handle
any supported type of profile. It stores profiles under
`/{etc,usr/lib,run}/NetworkManager/system-connections` and is
documented in [https://developer.gnome.org/NetworkManager/stable/nm-settings-keyfile.html
nm-settings-keyfile manual]. The ifcfg-rh format is in part compatible
with the network-scripts package from initscripts, however both
network-scripts and NetworkManager define their own extensions
([https://developer.gnome.org/NetworkManager/stable/nm-settings-ifcfg-rh.html
[1]]). Since network-scripts and NetworkManager are fundamentally
different, the same ifcfg file is not treated exactly the same by both
systems. In the past, having the ifcfg-rh format made it easier for
users familiar with initscripts to migrate to/from NetworkManager.
The settings plugins are configurable in
[https://developer.gnome.org/NetworkManager/stable/NetworkManager.conf.html
NetworkManager.conf] via the `"main.plugins"` option. Multiple plugins
can be configured and on Fedora 32 and older, the compile time default
for the option is `"ifcfg-rh,keyfile"`. This means, that when
NetworkManager stores a new profile to disk, it will first try to
persist it in ifcfg-rh format before falling back to keyfile format,
if the ifcfg-rh plugin doesn't support the profile type. When reading
profiles from disk, NetworkManager will read and expose profiles from
both settings plugins and when modifying an existing profile, it will
update the existing file and preserve the settings plugin.
This Change is about to change the default for `"main.plugins"` from
`"ifcfg-rh,keyfile"` to `"keyfile,ifcfg-rh"`.
== Feedback ==
This was brought up on the NetworkManager mailing list
([https://mail.gnome.org/archives/networkmanager-list/2020-May/msg00002.html
[1]]]).
Fedora CoreOS doesn't use ifcfg-rh files at all, only keyfile. Also,
RHEL CoreOS uses the `"main.plugins=ifcfg-rh,keyfile"` configuration
too. For CoreOS this of course is simpler, because they don't deal
with existing user configurations and tools that would break during
upgrade.
== Benefit to Fedora ==
The long term goal of NetworkManager is to move away from ifcfg-rh
files. That will be difficult as it affects existing installations and
will require migration of existing configurations. This change is only
a first step and affects how NetworkManager by default persists new
profiles to disk.
The ifcfg-rh format arguably has an uglier syntax and, contrary to
keyfile, does not support all profile types. Also, keyfile plugin is
available on every NetworkManager installation because that is the
only plugin that supports all profiles. Having multiple plugins and
file formats is confusing. By now, initscripts' `network-script`
package is deprecated in Fedora and upstream wants to move away from
that format in the long term. Also maintaining multiple settings
plugins is a maintainance burden, and in the past there were subtle
bugs where ifcfg-rh did not implement all settings (e.g.
[https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10754
CVE-2020-10754]). On other Linux distributions NetworkManager uses the
keyfile format by default. It is a general goal that NetworkManager
works similar on all distributions.
== Scope ==
* Proposal owners: The default settings for `"main.plugins"` can
already be selected at compile time. This only requires building the
package with a different default
([https://src.fedoraproject.org/rpms/NetworkManager/blob/a06b38bcbe8f9a38ba...
[3]]).
* Other developers: N/A (not needed for this Change)
* Policies and guidelines: N/A (not needed for this Change)
* Trademark approval: N/A (not needed for this Change)
== Upgrade/compatibility impact ==
This affects most users, unless they explicitly set the option in
NetworkManager.conf configuration. The biggest effect of this change
is that new profiles will now preferably be persisted in keyfile
format. This changes behavior for users who expect NetworkManager to
write ifcfg-rh files, or who have scripts or tools that expect that.
What will still work is that existing ifcfg files are loaded after
upgrade. Users who only use the D-Bus API (via one of the client
applications like nmcli or the GUI), shouldn't notice the difference.
As before, users still can explicitly configure the settings plugins
in NetworkManager.conf. This only affects the default, but it affects
existing installations if the user didn't explicitly configure
NetworkManager's `"main.plugins"` option.
The Change will be implemented by changing the compile time default,
instead of dropping a configuration snippet. The reason is that it is
preferably that the installation of NetworkManager avoids extra
configuration. The default behavior should be achived without any
configuration. During package update there would be the possibility to
drop a file `/etc/NetworkManager/02-update-plugins-ifcfg-rh.conf` that
preserves the previous behavior. However, I don't think that is
necessary. After upgrading NetworkManager, it will still read ifcfg-rh
file so for the user it is less necessary to preserve the previous
behavior. Also, dropping configuration snippets during package upgrade
has its own downsides because new installations behave different than
upgraded systems.
== How To Test ==
You can already test the effect by explicitly configuring the setting
which will become the default. For example, add a file
`/etc/NetworkManager/conf.d/99-main-plugins.conf` with content
[main]
plugins=keyfile,ifcfg-rh
== User Experience ==
NetworkManager now preferably uses the keyfile format (INI files).
This format is probably easier to understand to users and also has a
closer resemblance to how the profile is presented in nmcli.
If the user is using NetworkManager tools that use the D-Bus API (like
nmcli or the GUI), then the used storage plugin and format is usually
of no concern for the user.
== Dependencies ==
None
== Contingency Plan ==
The `"main.plugins"` option exists for a long time in NetworkManager.
All that changes here is the default of this option.
* Contingency mechanism: revert the change
* Contingency deadline: beta freeze
* Blocks release? No
== Documentation ==
I am not aware of documentation that gets affected by this.
== Release Notes ==
NetworkManager now prefers the keyfile settings plugin over ifcfg-rh
plugin when writing new connection profiles to disk. Existing ifcfg-rh
files are still handled as before.
--
Ben Cotton
He / Him / His
Senior Program Manager, Fedora & CentOS Stream
Red Hat
TZ=America/Indiana/Indianapolis
4 months, 2 weeks
Fedora Packager Dashboard available for testing
by Josef Skladanka
Hi,
We'd like to announce public testing of the Packager Dashboard - a new
service for Fedora package maintainers aiming to provide all relevant
data: FTBFS/FTI status (from both Bugzilla, Koschei and health check),
orphan warnings, bugzillas, pull requests, active overrides and
updates - at a single place in an easy to read and filter way.
The Dashboard is now available: https://packager.fedorainfracloud.org/
Packager Dashboard leverages caching in the Oraculum backend to
significantly speed-up loading times with comparison to querying all
the relevant resources separately. We, of course, can't cache the
entire Bugzilla, Pagure, Bodhi... so we only cache data for users who
visit Packager Dashboard at least once per 14 days. Please keep in
mind that the first load for a “new” user might take a while. Most of
the data sources are refreshed every hour.
You can use the Dashboard for individual accounts as well as for FAS groups.
We'd love to hear your feedback. Please keep in mind that this is
testing deployment - it's currently running on a server with very
limited resources and we're aiming for production deployment on
CommuniShift during this summer.
Feel free to provide ideas or bug reports at
https://pagure.io/fedora-qa/packager_dashboard or simply send an email
reply to this thread with all kinds of feedback.
I'd like to mention the other people who made this possible:
- Miro Hrončok (churchyard) - Original idea
<https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.o...>
and ideas for data to display
- František Zatloukal - Backend <https://pagure.io/fedora-qa/oraculum>
- Lukáš Brabec - Frontend <https://pagure.io/fedora-qa/packager_dashboard>
Josef
5 months
Fedora 32 system-wide change proposal: reduce installation media size
by improving the compression ratio of SquashFS filesystem
by Bohdan Khomutskyi
Summary
Improve compression ratio of SquashFS filesystem on the installation media.
Owner
Name: Bohdan Khomutskyi
Email: bkhomuts(a)redhat.com
Current status
Targeted release: I propose this change for Fedora 32
Last updated: Jan 5 2020
Pagure.io issue: https://pagure.io/releng/issue/9127
I was unable to create an article in Fedora wiki system.
Detailed Description
As of Fedora 31, the LiveOS/squashfs.img file on the installation image, is
compressed with default settings of mksquashfs. The standard configuration
is set to XZ algorithm with block size of 128k and BCJ filter enabled.
Those parameters can be adjusted which will lead to a better compression
ratio and/or reduction of the CPU usage at build time.
This is simple to achieve. Recently, Lorax has gotten support[1] for
adjusting the compression options for mksquashfs via the configuration
file. The file should be altered as following:
[compression]
bcj = yes
args = -b 1M -Xdict-size 1M -no-recovery
Where -b 1M and -Xdict-size 1M are block and dictionary sizes respectively.
Could be adjusted.
Benefit to Fedora
-
Reduction of the installation media size and the cost of storing and
distributing Fedora.
-
Reduction of the CPU usage at build time. Depending on which compression
parameters chosen.
-
See a graphical detail at https://pagure.io/releng/issue/9127.
Scope
-
Proposal owners:
The build environment should have support for adjusting the Lorax
configuration file.. Lorax is a program that produces the
LiveOS/squashfs.img file on the installation media.
One of the way to allow for such customization, is to add a feature in
Pungi, to allow for passing -c option to Lorax.
-
Release engineering: #9127 <https://pagure.io/releng/issue/9127>
-
Policies and guidelines: N/A
-
Trademark approval: N/A
Upgrade/compatibility impact
-
This change comes at a cost of higher memory usage during the
installation. Based on my personal estimations, this should not be the
issue. Since the decompression should require up to 1MiB per thread.
User Experience
-
Increasing the block size on the current configuration with EXT4 file
system, should increase latency while accessing the EXT4 filesystem. The
exact impact is to be evaluated.
-
The impact of latency will be reduced, if the plain SquashFS option is
be choosen.
Dependencies
-
N/A
Contingency Plan
-
N/A
Documentation
https://pagure.io/releng/issue/9127.
mksquashfs(1)
Release notes See also
https://pagure.io/releng/issue/8646
--
Bohdan Khomutskyi
Release Configuration Management engineer
Red Hat
5 months, 1 week
