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- MCP server with stdio transport for local use
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Episode: 4191
Title: HPR4191: rkvm software KVM
Source: https://hub.hackerpublicradio.org/ccdn.php?filename=/eps/hpr4191/hpr4191.mp3
Transcribed: 2025-10-25 21:03:58
---
This is Hacker Public Radio Episode 4191 from Monday the 26th of August 2024.
Today's show is entitled, Arc from Software KVM.
It is hosted by Windigo and is about 18 minutes long.
It carries a clean flag.
The summary is, a brief in reduction to the work of software KVM.
Hello Hacker Public Radio.
I couldn't help but find myself with two dilemmas, dilemma, I don't know.
The first being that my distribution of choice was upgrading and was going to be supporting
WALENT.
Which is a good thing, I've had very good experiences fooling around with WALENT.
However, the one tool that I use that isn't supported is Barrier.
The software KVM that I did an episode on a little while back.
I use that pretty regularly in my day-to-day life, I use it to share a keyboard and mouse
across from my personal computer to the work computer that is situated next to it.
So while I do want to upgrade to WALENT, not having that KVM software was going to
be a problem.
My second dilemma is that I was checking the HPR website and my last episode was uploaded
in April of 2022 and as I record this, it is August of 2024, which makes me a delinquent.
So in an effort to fix all of my problems, I decided to check out RKVM, which is a lower
level KVM software and do this episode on it.
So the first thing to know about RKVM is it works slightly different than Barrier and
some of the other applications I've used.
The other software KVM's I use apparently rely on the X Window Manager, they rely on
the X server to communicate their mouse movements to the other clients and that functionality
doesn't work in WALENT.
WALENT has security built into it that isolates different applications from one another.
So if you have your mouse moving in one application, it won't be detected by Barrier or whatever
X KVM you're used to using.
So I looked around for some alternatives and there's a couple in the works that I wasn't
able to check out, but I did find this RKVM software and it uses a pretty clever method
of getting around that.
RKVM doesn't communicate with X at all, it doesn't communicate with WALENT at all.
RKVM binds directly to your input devices and handles them at a lower level.
What this means is it's completely unaffected by display server software.
In fact, I'm fairly certain you don't even need to be running a display server.
You could use this on a headless machine, although I don't know how well that would work.
That seems like it'd be a strange choice, but in theory it's there.
So seeing as how this would fix my problem and get around the accelerations of my current
KVM software, I went ahead and tried it.
So the first thing to know about RKVM is I believe the R stands for Rust.
So it's our utility written in Rust, which I don't have a problem with.
You might have strong feelings about Rust either way, but I'm perfectly fine with that.
The second thing is that it didn't really have any Debian or Ubuntu packages, at least
not in the distributions that I was using.
I'm using ironically, I'm using a distribution from 2022.
So apparently that's when I stopped putting in efforts.
So it might have been packaged since then, but I went the manual route and compiled it
myself.
So as a requirement, I had to install lib-ev-dev.
I had to install the Clang compiler, and I also had to install cargo.
I'm not sure if I installed it for this, or I had installed other Rust utilities, but
you have to have cargo the Rust compiler as well.
Once you have those installed, the compilation went pretty smoothly.
It's just a cargo build-dash release.
Once you're in the source directory, oh, I should probably say that I cloned it straight
from the GitHub repository, and I stayed on the master branch.
That seemed like a stable option.
There's a link in the show notes to the repository for RKVM that you can clone, and if you jump
into that repository and run cargo space build-dash release, it will spin up its threads and
compile your software for you.
Now the documentation I'm reading, I'm reading right from the readme, it's very well written.
I'm under the header manual install, and they are not fooling around because the next
step is just to use copy to move the right binaries into the right folders.
So there's two roles for the computer's running RKVM.
There is the server, which is the machine that is connected to your keyboard and mouse,
and then there's the client, that's the other computers, or computer, that you want to
send your keystrokes and mouse movement to.
In the documentation, they have you copy the binaries for both client and server to the
usr-slashbin folder.
I just copied the client or the server depending on which machine I was on, but it's not going
to hurt to copy them both if you wanted to follow their directions.
There's also a certificate-gen binary that you need to run on the server, I believe, and
then you need to copy the certificates over to the client machines before you run everything.
But they get into that a little bit later in the readme.
So once it's compiled and you've copied over the binaries, the next step is confirmed
configuration.
On the server, I did it on the server, but somewhere you have to generate a certificate, which
is an encryption key that will encrypt your traffic between the client and server machines,
using this RKVM-certificate-gen utility.
It says you can provide your own from other sources, but it also does not give us a ton
of information on these keys.
It's a .pm file, which I've seen in some other like SSH utilities, but I just stuck
with their key-gen program to make sure that it was compatible.
And they have instructions for copying the certificate and private key on the server,
and then copying just the certificate to the client machines so that they don't have
to do any key exchange themselves.
It's just encrypted as soon as they connect.
Once you have the certificate and the private keys copied where they're supposed to be,
they have you copy an example configuration file, which is a Tommel file.
I'm not sure how to pronounce that exactly.
I've never really set it out loud before, but it's just a flavor of YAML, which is also
fun to say, but it's very easy to edit and insert your values into.
So they have you copy the example server config on the server, and the example client config
on the client.
I should add, I don't think it's explicitly mentioned, but I had to create the directory
that these files reside in on each machine server and client.
These configurations are very brief on the server.
It lets you configure which port the KVM software is listening on, which interface as well.
You can specify which IP address, which will let you restrict it to a certain interface
if you'd like.
You can specify the switch keys, and I'll get into those later.
It lets you specify these certificates that you've generated in the previous step and
a password so that you can also make sure you're not having other random clients connect
if somehow they got that certificate, the public certificate.
The client configuration is even briefer.
You specify the address of the server, including the port that you specified in your server config.
You can configure the path to the certificate that you've copied over, and that same password.
I'm assuming those have to match.
I haven't tried it without, but yeah, it's a pretty safe assumption.
They also include instructions on how to run a test instance of the server, which they
say is a good idea because it grabs your input, so it could steal your mouse and keyboard
and cause a problem, but they have a command line switch that shuts down the utility after
so many seconds, so that if it is stealing all your input, it will safely shut itself
down after a small period.
They also have instructions on setting up system D units for the server and client, depending
on which machine you're on, so that if you want to, you can have it start automatically.
I did enable this because I use this almost every day and have not regretted it yet.
It doesn't seem to affect anything while I'm not connected with the client machine, so
having it running in the background doesn't seem to be too much of an issue.
One of the reasons for that is the switch keys configuration.
Barrier, the software KVM I'm used to using, worked off of edge detection.
When it detected you running off the edge of your screen, as soon as you hit the edge,
it would transport your mouse cursor to another client that's configured to be on that edge.
I configured it so that my host machine, or the server, if I move my mouse all the way over
to the right-hand edge and kept going, kept pushing my mouse, it would automatically appear
on the left edge of my work machine, which is sitting to the left of it.
It was a really neat trick, and I miss it a little bit because RKVM uses a different approach.
Because they don't detect the edge of your screen, because they don't know anything about your
screen, they're grabbing the inputs directly. They have these switch keys that you can figure,
and they default to left alt and left control. So if you press left alt and left control, it triggers
the switch. So when you press those keys, your mouse and keyboard input jumps to the next machine,
the next client that's connected. That client has its own mouse location, its own
keyboard state. So wherever you're focused, you're focused. And then when you want to switch back
to the server, or at least the next client, I've never tried it with more than two machines at once,
but I assume it just does it in kind of a round robin. If you hit those switch keys again,
it will switch back, or switch to the next client in line, and eventually it will get back to the
server. So like I said, the default switch keys are left alt and left control, and I ran into a lot
of trouble with those, because that's what Nome uses to switch around workspaces and windows and
things. So I quickly had to switch those. I picked an artifact from an old hardware KVM I used to
use. I used the scroll lock key. So if I press scroll lock, it swaps over to the next device,
the next client in line, or back to the server. After using RKVM for quite a while, I think I might
add a second key in that combination, maybe F12 and scroll lock, or shift and scroll lock,
something that I don't hit regularly, because I find I accidentally hit scroll lock while I'm
hitting the print screen key or vice versa. So I feel like I need to switch that to something else,
maybe another key combination entirely, and get away from the scroll lock, but RKVM has support
for a wide variety of those kind of special function keys. If your keyboard has application keys
or special symbol keys, there's a chance that they support it as well.
There's a markdown file in the root of their folder called switch-keys.md,
and that contains all of the special supported keys that you can choose that will let you switch
back and forth, and they have a lot of them here. Let's see, if I scroll down randomly, there's an
address book, option, battery key. There's braille.keys, which I'm assuming there must be a braille
keyboard for typing in braille symbols. That's a new one to me. You can press the camera,
keys, all of the F keys are supported up to F24, possibly even further. So if you have some special
keys or have a device that can be bound to special keys, like with, I don't know what utility does
it in Whalen, but I know there's X utilities where you can rebind keyboard input to do different
keyboard symbols. You can bind your cap slot to a control or something like those. You could even
have a special RKVM symbol that you press that'll swap your configurations around. Or
if you're feeling a little mischievous, you could bind it to the Q key or something on somebody else's
computer and just have their keyboard input disappear every once in a while while they're typing words.
I do not advocate these kind of actions, but it's supported.
So I think that covers the basic functionality of RKVM that kind of uses it has.
It looks like there's a limitation section that says it's Linux only. So if you're looking for
something that's cross-platform, maybe you have to stick with barrier and other alternatives for
now because I know that they support multiple platforms for myself. Linux only is not
a limitation, that's just fine. And I have to say, I've used a lot of these kind of software
KVMs before and this has been a pretty smooth one considering I had to compile it myself.
After the minimal configuration that they cover in their documentation,
I wasn't expecting a lot because you never know what you're getting into when you have to hunt down
and compile your own software. But as soon as I copied those configuration files over
and ran their utility, it instantly worked. I had a great experience. I enabled the system
D units, everything's been working flawlessly and I have a strange setup. I use USB-C docs,
so I've got a network card that's connected via USB-C and sometimes addresses change and everything
just works. I don't know if I've just been very lucky in my use case, but if you do need this
kind of functionality and wanted to try something that's very low level that you can mix and match
display servers with, I would highly recommend RKVM. I supported the developer on coffee,
co-fi. I think it's supposed to be pronounced coffee, but they spell it with k-o-fi
because yeah, it's quickly become one of the tools I can't live without. So I hope they
enjoy developing it and are rewarded for doing so. So yeah, check it out. If that's something
interest you, I would give it a shot. You have been listening to Hacker Public Radio
at HackerPublicRadio.org. Today's show was contributed by a HPR listener like yourself.
If you ever thought of recording a podcast, then click on our contribute link to find out how
easy it really is. Hosting for HPR has been kindly provided by an onsthost.com, the internet
archive and rsync.net. On the Sadois status, today's show is released under Creative Commons
Attribution 4.0 International License.