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20cfa2af2c
This was missed when things were renamed. The intention with this code was (apparently) to provide a (pseudo)unique hostname in the case where something more specific was not provided (e.g. by DHCP). Make this a little clearer by using '(none)' rather than 'linuxkit' as the default, in the normal case this will be overwritten by something more specific and if it isn't we will change it to something somewhat unique derived from the MAC address (as before). nb: '(none)' is already used by Debian so I think it is a safe choice as the sentinel value. The use of both CONFIG_DEFAULT_HOSTNAME and the explicit /etc/hostname from mkimage.sh is likely to be redundant in some cases, but neither seems to completely cover all cases so keep both. Signed-off-by: Ian Campbell <ian.campbell@docker.com>
Linux kernel builds, based on mostly-vanilla upstream Linux kernels.
See ../docs/kernel-patches.md for how the local patches in patches-*
are maintained.
The build is mostly silent. A local build can be run via make. To view
the output use docker log -f <containerid>. The build creates multiple
containers, so multiple invocations may be necessary. To view the full build
output one may also invoke docker build . and then copy the build artefacts
from the image afterwards.
To build with various debug options enabled, build the kernel with
make DEBUG=1. The options enabled are listed in kernel_config.debug.
This allocates a significant amount of memory on boot and you may need to
adjust the kernel config on some systems. Specifically:
--- a/alpine/kernel/kernel_config
+++ b/alpine/kernel/kernel_config
@@ -415,8 +415,8 @@ CONFIG_DMI=y
# CONFIG_CALGARY_IOMMU is not set
CONFIG_SWIOTLB=y
CONFIG_IOMMU_HELPER=y
-CONFIG_MAXSMP=y
-CONFIG_NR_CPUS=8192
+CONFIG_MAXSMP=n
+CONFIG_NR_CPUS=8
# CONFIG_SCHED_SMT is not set
CONFIG_SCHED_MC=y
# CONFIG_PREEMPT_NONE is not set