How to use multiple bitbucket/github accounts from one machine in git?

Question

git

There are 2 bitbucket/github accounts - user1 and user2
Accordingly, there are 2 different access keys.
I made a config file, but after a reboot there are access errors

Host bitbucket.org
  User user1
  Hostname bitbucket.org
  IdentityFile ~/.ssh/user1

Host bitbucket.org
  User user2
  Hostname bitbucket.org
  IdentityFile ~/.ssh/user2

How to do it correctly so that the machine / git knows which key to use when (depending on which rep push)

Answer 1

https://stackoverflow.com/a/7927828/7436149