How to use chsh with ldap authentication

How to use zsh as default when starting an ssh session to a remote chef server using LDAP for authentication? tom@chef:~$ chsh -s /usr/bin/zsh Password: chsh: user 'tom' does not exist in /etc/passwd Zsh is installed on the system. cat /etc/shells # /etc/shells: valid login shells /bin/sh /bin/bash /bin/rbash /bin/dash /usr/bin/tmux /usr/bin/screen /bin/zsh /usr/bin/zsh