Docker exits in host network mode

Hello!

I want to use OpenWRT on an embedded device running docker. I have observed the following behaviour both on my development laptop and on the target device:

$ time docker run --network host openwrtorg/rootfs:x86-64-19.07.2
/etc/preinit: line 6: can't create /sys/devices/system/cpu/microcode/reload: Read-only file system
Press the [f] key and hit [enter] to enter failsafe mode
Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level

real	0m3,011s
user	0m0,045s
sys	0m0,028s

I am using time to give additional data, the same thing happens if I run without it. Also, I believe I need to use the --cap-add NET_ADMIN parameter to allow OpenWRT to make changes, but it does not seem to make a difference for now.

If I start the container using docker run --network host -it openwrtorg/rootfs:x86-64-19.07.2 ash I get a shell and I'm able to do some things, but important services like ubus are not running.

Is this a problem with init? /etc/init.d/rcS doesn't exist even though it's referenced by /etc/inittab. Any help locating the source of the problem would be appreciated!

Reproduce the host-network run command and inspect the startup paths named in the report: /etc/preinit, /etc/inittab, and /etc/init.d/rcS. Compare that startup behavior with an interactive ash session and determine why services such as ubus do not start; done means explaining the failure and identifying a verified fix or limitation.