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# About
VyOS runs on a custom Linux Kernel (which is 4.19) at the time of this writing.
This repository holds a Jenkins Pipeline which is used to build the Custom
Kernel (x86_64/amd64 at the moment) and all required out-of tree modules.
VyOS does not utilize the build in Intel Kernel drivers for its NICs as those
Kernels sometimes lack features e.g. configurable receive-side-scaling queues.
On the other hand we ship additional not mainlined features as WireGuard VPN.
## Kernel
The Kernel is build from the vanilla repositories hosted at https://git.kernel.org.
VyOS requires two additional patches to work which are stored in the patches/kernel
folder.
### Config
The Kernel configuration used is [x86_64_vyos_defconfig](x86_64_vyos_defconfig)
which will be copied on demand during the Pipeline run into the `arch/x86/configs`i
direcotry of the Kernel source tree.
Other configurations can be added in the future easily.
### Modules
VyOS utilizes several Out-of-Tree modules (e.g. WireGuard, Accel-PPP and Intel
network interface card drivers). Module source code is retrieved from the
upstream repository and - when needed - patched so it can be build using this
pipeline.
In the past VyOS maintainers had a fork of the Linux Kernel, WireGuard and
Accel-PPP. This is fine but increases maintenance effort. By utilizing vanilla
repositories upgrading to new versions is very easy - only the branch/commit/tag
used when cloning the repository via [Jenkinsfile](Jenkinsfile) needs to be
adjusted.
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