I dropped all dbs (nodebb, local, config) and the ran mongorestore dump/ and it restored without warning or errors, but I still have issue.
Also when I restart mongod, it fails now and it cannot connect to database. I think I should re-install it because I did not find a solution to fix it (database not running now).
My question: would it work if beside restoring by mongorestore, I copy all files of /var/lib/mongod/ from old server to new one?
Yes that's correct, this is on Mongo.
Right now for our hosted clients that are big (10m page views per month) we have a setup with a singular load balancer, several small app servers and a db server.
We're (or well, Julian is) experimenting with a setup with a floating IP pointing to multiple load balancers... looking forward to his blog post
EDIT: and like Julian said, this community is basically hosted on one single potato server ... doing okay with about half million pageviews per month.