Comment 4 for bug 1810932

Reviewed: https://review.openstack.org/629370
Committed: https://git.openstack.org/cgit/openstack/tripleo-common/commit/?id=0077402bbbb79ca97af19452f8b60a57d2219fc6
Submitter: Zuul
Branch: stable/rocky

commit 0077402bbbb79ca97af19452f8b60a57d2219fc6
Author: Oliver Walsh <email address hidden>
Date: Tue Jan 8 00:53:01 2019 +0000

    Workaround ssh_known_hosts changes not being propagated to containers

    We need an in-place update of /etc/ssh/ssh_known_hosts for the changes to be
    visible to running containers. This works around the issue until we have a
    better long-term solution - make a copy, update using lineinfile, then
    clobber the original file.

    Closes-bug: #1810932
    Change-Id: Ie6af5908d4b79bad094bce31e8e853678c0e843c
    (cherry picked from commit ca60b82be840a91e76a965438f0cdd35c9a2baca)