Well, one the purposes of containers is that they contain the minimal required to run things. You’re not supposed to get inside them unless debugging. If you care to describe what you were trying to explore and do I can think of something to write in the Dockerfiles or in the Docker environment. Our Docker infrastructure is still somewhat basic.
Not really. Tigase has clustering capabilities within the same service name (that is, the hostname after the @ sign in JIDs). What we are trying to achieve here is a system for redirecting users during the registration phase in order to balance the number of users served by any given server.
Indeed 
but the migration is intended for clients. A client could request a migration at any time, without having to contact the original server. Showing the signed key to the new server will suffice (since it’s trusted by the new server). Then activate some mechanism to clear the account from the old server if and when it comes back online.
Great! Feel free to ask anything in the meantime.