Description of problem: The satellite-installer --upgrade does not cut off client requests, which can result in actions being taken while the upgrade is occurring. Ideally, users would be able to run a command or rake task to quiesce the satellite server. This would include: * no longer responding to client checkins under /rhsm * finishing all pending tasks and not accepting new tasks * clearing all work queued for "listen on candlepin events" and "monitor event queue" tasks Once the server is quiesced, the upgrade can proceed. By default, the server will become active once the upgrade is complete. This feature would mostly be useful for upgrades, but users may want to use it when shutting the satellite down for other maintenance.
I'm planning to add this into the upgrade enhancements, even if it meant just temporarily sutrning on iptables on 443 port, which is one of the ways to achieve this.
For the record, foreman-maintain script will allow "poor's man" solution to proper shutdown, until this RFE is resolved.
Foreman maintain now proivdes this feature. To use it, run the following before the upgrade: foreman-maintain advanced procedure run maintenance-mode-{dis,en}able