Docker Daemon not starting in Chroot

[amanharitsh123]

Cant start docker daemon in chroot error while running docerkd Error starting daemon: Devices cgroup isn't mounted PS : Error occured while building on optimization branch.

[quozl]

• possibly you need a kernel filesystem mounted; you can see in 10-bootstrap.sh how the minimum filesystems are mounted;

mount -t proc none "${R}/proc"
mount -t sysfs none "${R}/sys"

• also see functions.sh, in fact please read all the source code and understand it, :grin:

• for diagnosing this problem, use an interactive bash shell within the script;

chroot_exec bash </dev/tty >/dev/tty 2>/dev/tty

which will pause at that point giving you a bash prompt, and then use the shell to figure out what is needed by docker. This saves you time because you don't have to wait for a build to get to that stage.

• use a properly booted Raspberry Pi to check how the /sys/fs/cgroup is mounted; on mine it is a tmpfs of about 464 Mb,
• then work out how to umount and mount it, perhaps finding where in system startup it is mounted,
• add the appropriate mount command to the bash shell and test docker within the chroot,
• once that works, add the mount and umount command to 10-bootstrap.sh and functions.sh, so that further runs will do so with the cgroup fs available.

[amanharitsh123]

I have mounted cgroupfs , using sudo service docker start but now we are having this issue

Error starting daemon: Error initializing network controller: error obtaining controller instance: failed to create NAT chain: iptables failed: iptables -t nat -N DOCKER: iptables v1.6.0: can't initialize iptables tablenat': iptables who? (do you need to insmod?) Perhaps iptables or your kernel needs to be upgraded. (exit status 3)``