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A Linux container can use an authorized_keys file outside my home directory, but ephemeral containers based on it can't. Why?

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http://askubuntu.com – In Ubuntu 12.10, I've created an LXC of type 'ubuntu' using the lxc-create utility. I then create ephemeral containers based on this container using the lxc-start-ephemeral utility, and I need to connect to those using password-less ssh. However, I need to keep their /home/ubuntu folders pristine, so I can't put the usual .ssh/authorized_keys file in there. The 'encrypted home directory' section here tells me how to move authorized_keys out of the home directory. After I follow those instructions from inside the base container, I can ssh into the base container without giving a password. How (HowTos)