SSH with version control system

Run SSH in your machine.

sudo systemctl start sshd

Run SSH in machine startup, so that you do not have to do the above command again in future.

sudo systemctl enable sshd

» Created symlink '/etc/systemd/system/multi-user.target.wants/sshd.service' → '/usr/lib/systemd/system/sshd.service'.

Create a unique key to connect with github/bitbucket, so that anytime you pull or push code from it won’t as you for password. Bitbucket will identify and authorize based on the key.

ssh-keygen -t ed25519 -C "your_email@example.com" -f ~/.ssh/id_ed25519_bitbucket

» Will prompt you to enter a passphrase twice. [You can use your pc login password ;-) ]

Re-check to be extra sure that SSH is running.

eval "$(ssh-agent -s)"

» Agent pid 7660 give you something like this. This output means the SSH service is running in your machine.

Now add the newly create key into SSH database.

ssh-add ~/.ssh/id_ed25519_bitbucket

» It will again ask for passphrase you entered earlier.

Let check all the key have

ls -al ~/.ssh

Now we have to give the (.pub) public copy of the key to github/bitbucket.

To avoid running ssh-add for every new session, we can run the following command once and the keychain will store the passphrase and reload that in every session automatically.

# install keychain if it does not exist in you machine
eval $(keychain --quiet --eval ~/.ssh/id_ed25519_bitbucket)

For bitbucket:

Click the setting (cog icon) on the top right next to profile icon > Personal bitbucket settings > SSH keys

Now click add key, on the form give a name and

cat ~/.ssh/id_ed25519_bitbucket.pub

copy the output and paste SSH public key field, and click Save.

That’s it. You can now pull and push new code anytime without typing bitbucket password.

For github:

Visit https://github.com/settings/profile > SSH and GPG keys > New SSH keys >

Now click add key, on the form give a name and

cat ~/.ssh/id_ed25519_bitbucket.pub

copy the output and paste SSH public key field, and click Save.

That’s it. You can now pull and push new code anytime without typing github password.

Now to read the correct public SSH key

Add the following configuration in .ssh/config file

Host bitbucket.org
  HostName bitbucket.org
  User git
  IdentityFile ~/.ssh/id_ed25519_bitbucket
  IdentitiesOnly yes


Host github.com
  HostName github.com
  User git
  IdentityFile ~/.ssh/id_ed25519_github
  IdentitiesOnly yes
  IdentityAgent $SSH_AUTH_SOCK


Host github-personal
  HostName github.com
  User git
  IdentityFile ~/.ssh/id_ed25519_personal_github
  IdentitiesOnly yes
  IdentityAgent $SSH_AUTH_SOCK

To load the correct configuration at run time, we have to change the URL while we do cloning.

Example:

For office account: git clone git@github.com:username/repo.git

For personal account: git clone git@github-personal:username/repo.git