1️⃣3️⃣ Here's the 13th post highlighting key new features of the recently released v259 release of systemd. #systemd259 #systemd
In episode 7 and 11 of this series we already talked about systemd-repart a bit. Here's another pair of features we added in 259: there are new switches --defer-partitions-empty= and --defer-partitions-factory-reset=. These take a boolean argument, and are closely related to the pre-existing --defer-partitions= switch.
To understand what the new switches do, let's…
1️⃣5️⃣ Here's the 15th post highlighting key new features of the recently released v259 release of systemd. #systemd259 #systemd
Here's a quick one: you might have noticed that whenever a systemd service deactivates we'll log a brief journal message saying the amount of CPU time consumed, and the peak memory used by this unit cycle. With v259 that message is slightly extended: it will now also indicate the wall clock time passed since activation of the unit. This is particularly nice when…
1️⃣6️⃣ Here's the 16th post highlighting key new features of the recently released v259 release of systemd. #systemd259 #systemd
systemd-firstboot is a small terminal tool that – if enabled – can run on first boot of a freshly installed system and interactively ask a number of very basic but essential configuration questions that are important to operate the system. It can be used in place of a fancier graphical tool, and maybe even act as blueprint for such a tool.
1️⃣9️⃣ Here's the 19th post highlighting key new features of the recently released v259 release of systemd. #systemd259 #systemd
Each systemd service has various ExecXYZ= stanzas that control what command to execute on which operation. Most importantly, there's of course ExecStart= which configures the command to run for actually starting the service. Then there's ExecStartPre=, ExecStartPost=, ExecReload=, ExecStop=, ExecStopPost=.
And with systemd v259 there's one more knob like this:
2️⃣1️⃣ Here's the 21st post highlighting key new features of the recently released v259 release of systemd. #systemd259 #systemd
In episode 16 we already talked about systemd-firstboot, systemd's little configuration console tool that can run on first boot and ask the user for a few simple basic questions regarding keymap or locale or such.
With v259 it received a small facelift of a kind. First of all, we'll now turn off concurrent log output from the kernel and from PID 1…
2️⃣0️⃣ Here's the 20th post highlighting key new features of the recently released v259 release of systemd. #systemd259 #systemd
systemd's unit ordering dependencies implement a directed graph, which is supposed to be acyclic, i.e. contain no cycles, so that it's always clear which units to activate before which other units.
But given that units are typically written by humans, the graph quite often actually does have cycles, and if that happens systemd has to break them somehow, …
2️⃣2️⃣ Here's the 22nd post highlighting key new features of the recently released v259 release of systemd. #systemd259 #systemd
In v258 systemd-nspawn gained support for running unpriviled containers from directories owned by the "foreign" UID range. To get container images owned by that you had to manually chown() the images (recursively), for example via systemd-dissect --shift. And while the systemd-nspawn invocation is not privileged, that re-chown()-ing definitely has requires privileges.
2️⃣3️⃣ Here's the 23rd post highlighting key new features of the recently released v259 release of systemd. #systemd259 #systemd
As you probably know sysemd-udevd processes notification events received from the kernel ("uevents") with a set of rules that match properties, set properties and execute code. Debugging these can be a bit annoying, since – of course – these notifications are typically result of hardware events, and hence attempts to correctly reproduce any issues in a controlled…
2️⃣ Here's the 2nd post highlighting key new features of the upcoming v260 release of systemd. #systemd260 #systemd
systemd is adopting the IPC system in more and more places. One nice thing about Varlink is that it is conceptually close to HTTP, in its request/response semantics. This is on purpose to make bridging the web world and the low-level system world easy.
@michaelvogt has beeing working on a Varlink/HTTP bridge in Rust, with various bells and whistles, including…
3️⃣ Here's the 3rd post highlighting key new features of the upcoming v260 release of systemd. #systemd260 #systemd
In the previous episode we talked about the Varlink/HTTP bridge and the protocol plugins for sd-varlink/varlinkctl. Closely related to this is another new addition in v260: the special /run/varlink/registry/ directory, where any "well-known" varlink services can symlink their sockets into.
Right now, systemd's various Varlink sockets are bound in a variety of service-specific…
5️⃣ Here's the 5th post highlighting key new features of the upcoming v260 release of systemd. #systemd260 #systemd
One of the fundamental operations one can execute on a systemd service is "reload", i.e. asking the service to reload its configuration, for example via "systemctl reload foobar.service". What precisely this triggers in the service code, is up to the developers to decide, but the assumption is that it rescans and parses its configuration files, without any interruptions…
4️⃣ Here's the 4th post highlighting key new features of the upcoming v260 release of systemd. #systemd260 #systemd
When running code from OS trees, for example in containers, or when booting a full OS in a VM or on bare-metal it's often very useful to put together the basic OS from multiple overlayfs-style layers (directory-backed or backed by DDIs), plus some additional bind mounts, and possibly a tmpfs or two mounted to the right places to get ephemeral or partially ephemeral behaviour.
RE: https://mastodon.social/@amutable/115967747219090945
Today, we announce Amutable, our ✨ new ✨ company. We – @blixtra, @brauner, @davidstrauss, @rodrigo_rata, @michaelvogt, @pothos, @zbyszek, @daandemeyer, @cyphar, @jrocha and yours truly – are building the 🚀 next generation of Linux systems, with integrity, determinism, and verification – every step of the way.
→ https://amutable.com/blog/introducing-amutable ←
#amutable #linux #systemd #⊼mutable #integrity
3️⃣ Here's the 3rd post highlighting key new features of the upcoming v261 release of systemd. #systemd261 #systemd
One very annoying error situation when developing operating systems is a boot loop: something fails while the system is still booting, and the thing immediately reboots, and you don't even get a chance to look at the screen to figure out what is going on. And then the system starts up again, and fails again, and so on and so on…
It's that time again! The systemd v261 release is coming closer. Let's restart the "what's new" series of posts for this iteration! Hence:
1️⃣ Here's the 1st post highlighting key new features of the upcoming v261 release of systemd. #systemd261 #systemd
systemd-repart is systemd's dynamic disk partitioner and image generation tool. It only deals with GPT disk labels – or more precisely, it only dealt with GPT disk labels *so* *far*. With v261 there's…
2️⃣ Here's the 2nd post highlighting key new features of the upcoming v261 release of systemd. #systemd261 #systemd
When you care for a more than a single system, it is often advisable to roll out new stuff in a staged fashion: first 1% of your fleet should get it, and only after the results are in and all is good, you up it to 10%, and then to 25% and finally to 100% (or in other steps like this).
With v261, systemd is going to help you with this to some degree:
4️⃣ Here's the 4th post highlighting key new features of the upcoming v261 release of systemd. #systemd261 #systemd
On many servers and embedded devices serial console console access on boot is absolutely essential. For that reason, firmwares (UEFI), boot loaders, and the kernel itself all support sending their boot time output to a serial port, and receiving input from it.
Configuring serial consoles in the boot loader and Linux is kinda painful though: you need to know some…
5️⃣ Here's the 5th post highlighting key new features of the upcoming v261 release of systemd. #systemd261 #systemd
When we first put together systemd-boot, it supported only UAPI.1 Type #1 entries: small text files with separate lines for kernel, initrd, and a few other fields. Soon later we added Type #2 entries, i.e. UKIs that are self-descriptive and which you just drop in the right dir. They have nice security and robustness properties, but they also had drawbacks, because they were very…
7️⃣ Here's the 7th post highlighting key new features of the upcoming v261 release of systemd. #systemd261 #systemd
Installing image-based OSes is comparatively simple: instead of acquiring a large number of packages, unpacking them all and running scriptlets for them, you basically just have to stream in a /usr/ partition and you are done.
Well, basically. In reality it's a tiny bit more complex: you also need to install a boot loader and a kernel to the ESP, and maybe set up an XBOOTLDR…
6️⃣ Here's the 6th post highlighting key new features of the upcoming v261 release of systemd. #systemd261 #systemd
Two of the first questions you are typically asked by OS installation wizards when setting up a new Linux system are "Which language do you prefer?" and "Which keyboard mapping would you like?".
In particular the latter question I found irritating, and that for the last 20 years or so: if I have a physical German keyboard in my laptop, why can't the system make the…
#FOSS is all about options:
- I chose not to use #RedHat systems 28 years ago.
- I chose not te use #GNOME 15 years ago
- I chose not to use #SystemD 6 years ago.
- I choose to accelerate the migration of all the #Linux based systems I can to #BSD systems because:
- I choose to keep up with the #UNIX way
- I choose to use stable systems which don't change for the sake of change
- I choose to be part of healthier communities, that don't promote monoculture or fall so easily into arrogance
[$] A truce in the Manjaro governance struggle
Members of the Manjaro Linux distribution's community have published a "Manjaro 2.0 Manifesto" that contains a list of complaints and a demand to restructure the project to provide [...]
https://lwn.net/Articles/1063717/ #LWN #Linux #ArchLinux #Git #Firefox #systemd
