I follow https://github.com/sakaki-/raspbian-nspawn-64/wiki/Using-Docker-Inside-the-Container
But after install docker failed to start
.....
Jun 16 19:37:14 debian-buster-64 dockerd[3290]: failed to start daemon: Error initializing network controller: Error creating default "bridge" network: libnetwork: Unable to disable IPv6 router advertisement: open /proc/sys/net/ipv6/conf/docker0/accept_ra: read-only file system
Jun 16 19:37:14 debian-buster-64 systemd[1]: docker.service: Main process exited, code=exited, status=1/FAILURE
Jun 16 19:37:14 debian-buster-64 systemd[1]: docker.service: Failed with result 'exit-code'.
Jun 16 19:37:14 debian-buster-64 systemd[1]: Failed to start Docker Application Container Engine.