The kernel command-line is a string of text that the kernel parses as it is starting up. It is passed by the boot loader to the kernel and specifies parameters that the kernel uses to configure the system. The command-line is a list of command-line options separated by spaces. The options are parsed by the kernel and can be used to enable or disable certain features.
LinuxKit passes all command-line options to the kernel, which uses them in the usual way.
There are several options that can be used to control the behaviour of linuxkit itself, or specifically packages
within linuxkit. Unless standard Linux options exist, these all are prefaced with linuxkit..
| Option | Description |
|---|---|
linuxkit.unified_cgroup_hierarchy=0 |
Start up cgroups v1. If not present or set to 1, default to cgroups v1. |
linuxkit.runc_debug=1 |
Start runc for onboot and onshutdown containers to run with --debug, and add extra logging messages for each stage of starting those containers. If not present or set to 0, default to usual mode. |
linuxkit.runc_console=1 |
Send logs for runc for onboot and onshutdown containers, as well as the output of the containers themselves, to the console, instead of the normal output to logfiles. If not present or set to 0, default to usual mode. |
It often is useful to combine both of the linuxkit.runc_debug and linuxkit.runc_console options to get the most
information about what is happening with onboot containers.