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Git via SSH - multiple keys management

mikolajbuchwald

Mikołaj Buchwald

Posted on June 23, 2022

Git via SSH - multiple keys management

In order to use git over ssh, you need ssh keys. When you want to use multiple keys for different domains, you have to know where and how to configure it. I always forget where this configuration file is stored, so here I make a short note about it. Just edit ~/.ssh/config, e.g.:

vim ~/.ssh/config
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Then put there something like:

Host github.com
 HostName github.com
 IdentityFile ~/.ssh/id_rsa_github
Host gitlab.com
 HostName gitlab.com
 IdentityFile ~/.ssh/id_rsa_gitlab
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Et violà!

Source: https://superuser.com/a/232406/950943

Edit: Troubleshooting: On AWS' EC2 machines you may get an Bad owner or permissions on /home/ec2-user/.ssh/config error when trying to clone a repository, e.g.:

[ec2-user@ip-my-ip ~]$ git clone git@gitlab.com:mikbuch/my-repo-name.git
Cloning into 'my-repo-name'...
Bad owner or permissions on /home/ec2-user/.ssh/config
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
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You have to make sure that you have 400 permission on your ~/.ssh/config file, i.e.:

[ec2-user@ip-my-ip ~]$ ls -la ~/.ssh/
total 12
drwx------ 2 ec2-user ec2-user   73 Dec 29 19:51 .
drwx------ 7 ec2-user ec2-user  175 Dec 29 19:52 ..
-r-------- 1 ec2-user ec2-user 1831 Dec 29 19:50 my-deployment-key.pem
-rw------- 1 ec2-user ec2-user  957 Dec 20 20:25 authorized_keys
-rw-rw-r-- 1 ec2-user ec2-user   81 Dec 29 19:51 config
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Use the following command to change the permissions:

[ec2-user@ip-my-ip ~]$ chmod 400 ~/.ssh/config
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See the result:

[ec2-user@ip-my-ip ~]$ ls -la ~/.ssh/
total 16
drwx------ 2 ec2-user ec2-user   92 Dec 29 19:53 .
drwx------ 8 ec2-user ec2-user  196 Dec 29 19:53 ..
-r-------- 1 ec2-user ec2-user 1831 Dec 29 19:50 my-deployment-key.pem
-rw------- 1 ec2-user ec2-user  957 Dec 20 20:25 authorized_keys
-r-------- 1 ec2-user ec2-user   81 Dec 29 19:51 config
-rw-r--r-- 1 ec2-user ec2-user  207 Dec 29 19:53 known_hosts
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Now the clonning should work:

[ec2-user@ip-my-ip ~]$ git clone git@gitlab.com:mikbuch/my-repo-name.git
Cloning into 'my-repo-name'...
The authenticity of host 'gitlab.com (2606:4700:90:0:f22e:fbec:5bed:a9b9)' can't be established.
ECDSA key fingerprint is SHA256:HbW3g8zUjNSksFbqTiUWPWg2Bq1x8xdGUrliXFzSnUw.
ECDSA key fingerprint is MD5:f1:d0:fb:46:73:7a:70:92:5a:ab:5d:ef:43:e2:1c:35.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'gitlab.com,2606:4700:90:0:f22e:fbec:5bed:a9b9' (ECDSA) to the list of known hosts.
remote: Enumerating objects: 287, done.
remote: Counting objects: 100% (206/206), done.
remote: Compressing objects: 100% (169/169), done.
remote: Total 287 (delta 37), reused 200 (delta 36), pack-reused 81
Receiving objects: 100% (287/287), 1.25 MiB | 3.19 MiB/s, done.
Resolving deltas: 100% (64/64), done.
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💖 💪 🙅 🚩
mikolajbuchwald
Mikołaj Buchwald

Posted on June 23, 2022

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