Git config error on setup multiple ssh on github

Question

I am trying to setup my git config to choose the ssh that corresponds to each case

Host github.com_enterprise
    Hostname github.com
    User user_enterprise@enterprise.com
    IdentityFile ~/.ssh/id_enterprise_ssh

Host github.com_personal
    Hostname github.com
    User user_personal@personal.com
    IdentityFile ~/.ssh/id_personal_ssh

or

Host github.com:enterprise
    Hostname github.com
    User user_enterprise@enterprise.com
    IdentityFile ~/.ssh/id_enterprise_ssh

Host github.com:personal
    Hostname github.com
    User user_personal@personal.com
    IdentityFile ~/.ssh/id_personal_ssh

I have found that the host was supposed to be the alias but it doesn't work. For example, if want to make git clone works with id_enterprise_ssh what I have to do is

Host github.com
    Hostname github.com
    User user_enterprise@enterprise.com
    IdentityFile ~/.ssh/id_enterprise_ssh

I have to edit the host by deleting the _enterprise and deleting the other github.com_personal information. So, I wonder what I am missing in my config setup

Answer 1

When you use ssh via something like git clone git@github.com:your-username/your-repo.git , SSH is looking for github.com to match the Host <X> alias, not the Hostname value. So, if you use the first option for ssh_config, your SSH-related commands should look like:

git clone git@github.com_personal:<org>/<repo>.git

Note that once you start doing this, you may have to make sure your remote-urls are configured correctly (that is, that they say github.com_personal and github.com_enterprise ). You can check with git remote -v . You also have to make sure all of the relevant SSH keys are added to your SSH-agent.

Answer 2

Considering an SSH URL for github.com will always use git@ as a remote user, do replace in each of your Host entry a line:

User git

That way, you can test each of your Host entry wtih

ssh -Tv github.com_personal
ssh -Tv github.com_enterprise

In both instances, you should see a welcome message with the right perosnal or enterprise username in it.