I am migrating my companies instance of discourse from CentOS 6 to CentOS 7 host. I can no longer update Discourse on Cent 6 because there is no new Docker versions. The first thing that I tried is what you mention above. I can import my backup, and successfully restore my data. The catch is I am no longer able to log into the site. Its in some weird state that the new instance thinks that I am logged in from the old instance, causing a log in loop on the new instance. I tried to use the api gem to force log myself out, but you need admin priv’s to do this. I cannot log in, in any form or fashion on the new instance to use the log out API call.
After that, I decided to attempt to simply stand up a new instance, and sync my standalone dir. on top of the new one, considering you offer a psql 9.3 template. Unfortunately I cannot bootstrap with the 9.3 template due to the apt-get errors mentioned above. If I bootstrap with the vanilla postgres template, I get schema errors because my old instance was running on 9.3.
I guess my next option will be to import the old Docker container via registry, and sync over the entire old “var/docker” directory to my new server, then fingers crossed when I attempt to actually update the instance.
Please let me know if there is anything else I can try here.