716c55abdd
Adds a practical set of kernel config used by docker-in-docker and kind for network bridging and filtering. It also includes the matching IPv6 support to allow tools like kind that require IPv6 network policies to work out of the box. This support includes: - nftables reject and filtering support for inet/ipv4/ipv6 - Bridge filtering for container-to-container traffic - IPv6 NAT, filtering, and packet matching rules for network policies - VXLAN and IPsec crypto support for network tunneling - TMPFS POSIX ACL support for filesystem permissions The configs are organized across fragment files: - common/fs.conf: TMPFS ACL support - common/crypto.conf: IPsec/VXLAN crypto algorithms - common/network.conf: VXLAN, IPsec ESP, nftables bridge/ARP/netdev - common/netfilter.conf: IPv6 netfilter stack and nftables advanced features Fixes: #11886 Signed-off-by: Simon Kaegi <simon.kaegi@gmail.com>
Kata Containers kernel config files
This directory contains Linux Kernel config files used to configure Kata Containers VM kernels.
Types of config files
This directory holds config files for the Kata Linux Kernel in two forms:
- A tree of config file
fragmentsin thefragmentssub-folder, that are constructed into a complete config file using the kernelscripts/kconfig/merge_config.shscript. - As complete config files that can be used as-is.
Kernel config fragments are the preferred method of constructing .config files
to build Kata Containers kernels, due to their improved clarity and ease of maintenance
over single file monolithic .configs.
How to use config files
The recommended way to set up a kernel tree, populate it with a relevant .config file,
and build a kernel, is to use the build_kernel.sh script. For
example:
$ ./build-kernel.sh setup
The build-kernel.sh script understands both full and fragment based config files.
Run ./build-kernel.sh help for more information.
How to modify config files
Complete config files can be modified either with an editor, or preferably
using the kernel Kconfig configuration tools, for example:
$ cp x86_kata_kvm_4.14.x linux-4.14.22/.config
$ pushd linux-4.14.22
$ make menuconfig
$ popd
$ cp linux-4.14.22/.config x86_kata_kvm_4.14.x
Kernel fragments are best constructed using an editor. Tools such as grep and
diff can help find the differences between two config files to be placed
into a fragment.
If adding config entries for a new subsystem or feature, consider making a new fragment with an appropriately descriptive name.
If you want to disable an entire fragment for a specific configuration, you can add the tag # !${arch} or # !confidential in the first line of the fragment. You can also exclude multiple tags on the same line. Note the # at the beginning of the line, this is required to avoid that the tag is interpreted as a configuration.
Example of valid exclusion:
# !s390x !ppc64le
The fragment gathering tool performs some basic sanity checks, and the build-kernel.sh will
fail and report the error in the cases of:
- A duplicate
CONFIGsymbol appearing. - A
CONFIGsymbol being in a fragment, but not appearing in the final .config- which indicates that
CONFIGvariable is not a part of the kernelKconfigsetup, which can indicate a typing mistake in the name of the symbol.
- which indicates that
- A
CONFIGsymbol appearing in the fragments with multiple different values.