What the purpose of this line?

[piyueh]

This line does nothing:

petibm-recipes/docker/Dockerfile-0.5.1-GPU-OpenMPI-xenial

Line 23 in 3987d84

sed -i 's/PermitRootLogin without-password/PermitRootLogin yes/' /etc/ssh/sshd_config && \

The only place matching the pattern PermitRootLogin without-password in /etc/ssh/sshd_config is in a comment section, which does not affect the SSH daemon.

I guess the original intention is to modify the setting of PermitRootLogin to yes? In that case, the pattern to be searched should be PermitRootLogin[[:blank:]]+prohibit-password. At least this is the default setting in /etc/ssh/sshd_config in the xenial image.

Nevertheless, changing from prohibit-password to yes for root doesn't seem to make sense to me. root does not have a password so it can not log in with a password even if PasswordAuthentication is yes. In other words, no matter whether PermitRootLogin is prohibit-password or yes, root always has to log in with a key. I think.