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6.13. Consoles
Containers have a configurable number of consoles. One always exists on the container's /dev/console. This is shown on the terminal from which you ran lxc-start, unless the -d option is specified. The output on /dev/
console can be redirected to a file using the -c console-file option to lxc-start. The number of extra consoles is specified by the lxc.tty variable, and is usually set to 4. Those consoles are shown on /dev/ttyN (for 1 <= N <= 4). To log into console 3 from the host, use:
sudo lxc-console -n container -t 3
or if the -t N option is not specified, an unused console will be automatically chosen. To exit the console, use the escape sequence Ctrl-a q. Note that the escape sequence does not work in the console resulting from lxc- start without the -d option.
Each container console is actually a Unix98 pty in the host's (not the guest's) pty mount, bind-mounted over the guest's /dev/ttyN and /dev/console. Therefore, if the guest unmounts those or otherwise tries to access the actual character device 4:N, it will not be serving getty to the LXC consoles. (With the default settings, the container will not be able to access that character device and getty will therefore fail.) This can easily happen when a boot script blindly mounts a new /dev.