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docs: Add a section on custom kernel builds

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fixes #1835

Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
This commit is contained in:
Rolf Neugebauer 2017-05-16 10:07:21 +01:00
parent 9fd743a28f
commit 6c4722d4a9
1 changed files with 21 additions and 0 deletions
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docs/kernels.md
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@ -65,6 +65,27 @@ file. [kmod.yml](../tests/kmod/kmod.yml) contains an example for the
configuration.
## Building and using custom kernels
To build and test locally modified kernels, e.g., to try a different
kernel config or new patches, the existing kernel build system in the
[`./kernel`](./kernel) can be re-used. For example, assuming the
current 4.9 kernel is 4.9.28, you can build a local kernel with:
```
make build_4.9.28 HASH=foo
```
This will create a local kernel image called
`linuxkit/kernel:4.9.28-foo` which you can use in your YAML file as:
```
kernel:
image: "linuxkit/kernel:4.9.28-foo"
```
If you have more substantial changes, or require a different kernel
version, it's best to replicate the kernel build system and change the
Docker Hub organisation to your own.
## Working with Linux kernel patches for LinuxKit
We may apply patches to the Linux kernel used in LinuxKit, primarily to