tarranjones/multiple_ssh_setting.md

## multiple_ssh_setting.md

      
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              multiple_ssh_setting.md
            
          
    Multiple SSH Keys settings for different git account

Create different public keys

Create different ssh keys for each git account
$ ssh-keygen -t rsa -b 4096 -N "" -C "$USER@$HOSTNAME to tarranjones@github.com" -f ~/.ssh/tarranjones@github.com_id_rsa
$ ssh-keygen -t rsa -b 4096 -N "" -C "$USER@$HOSTNAME to otherusername@github.com" -f ~/.ssh/otherusername@github.com_id_rsa
$ ssh-keygen -t rsa -b 4096 -N "" -C "$USER@$HOSTNAME to tarranjones@bitbucket.org" -f ~/.ssh/tarranjones@bitbucket.org_id_rsa
$ ssh-keygen -t rsa -b 4096 -N "" -C "$USER@$HOSTNAME to otherusername@bitbucket.org" -f ~/.ssh/otherusername@bitbucket.org_id_rsa

If you would like to use a passphrase then remove -N "" from the command, you will then be prompted for you pass-phrase.
This will create the following files
~/.ssh/tarranjones@github.com_id_rsa
~/.ssh/otherusername@github.com_id_rsa
~/.ssh/tarranjones@bitbucket.org_id_rsa
~/.ssh/otherusername@bitbucket.org_id_rsa

Please refer to github ssh issues for common problems.
You can add your keys to memory (give to ssh-agent) using the ssh-add command,
# run agent if it is'nt already 
$ eval `ssh-agent -s`

$ ssh-add ~/.ssh/tarranjones@github.com_id_rsa
$ ssh-add ~/.ssh/tarranjones@bitbucket.org_id_rsa
$ ssh-add ~/.ssh/otherusername@github.com_id_rsa
$ ssh-add ~/.ssh/otherusername@bitbucket.org_id_rsa

or modify ~/.ssh/config to specify that keys should be automatically added to a running ssh-agent
To list your added keys
$ ssh-add -l

to delete all cached keys with
$ ssh-add -D

Modify the ssh config

Make sure ~/.ssh exists and is writable
$ mkdir -p $HOME/.ssh
$ chmod 0700 $HOME/.ssh

Make sure ~/.ssh/config exists and open in your text editor (subl)
$ cd ~/.ssh/
$ touch config
$ subl -a config

Then add the following
#Set Git User Domains
Host *-github.com *-bitbucket.org *-bitbucket.com
  User git

#IdentityFile
Host tarranjones-*
  IdentityFile ~/.ssh/tarranjones@%h_id_rsa

Host otherusername-*
  IdentityFile ~/.ssh/otherusername@%h_id_rsa

#Hostnames
Host *-github.com
  Hostname github.com

Host *-bitbucket.com *-bitbucket.org
  Hostname bitbucket.org

Host *
  Protocol 2
  UseKeychain yes
  AddKeysToAgent yes
  IdentitiesOnly yes

Modify your Git config

I recommend setting your global config to match your most frequently used account details
$ git config --global user.name "tarranjones"
$ git config --global user.email "tarranjones@gmail.com"

Having the same username and email address for all your primary accounts across different git hosting providers is something worth thinking about.
Your user config would have to be changed a lot less.
Clone you repo and modify your Git config

clone your repo
git clone tarranjones-github.com:username/repo.git

...or for an existing working directory
git remote set-url origin tarranjones-github.com:username/repo.git

you should set your user config for repositories where details differ from your global config details.
cd repo and modify git config
$ git config user.name "otherusername"
$ git config user.email "otheremail@gmail.com"

then use normal flow to push your code
$ git add .
$ git commit -m "your comments"
$ git push

Heres a little helper function
usage: ssh [user@]host]
function ssh_keygen(){
    ssh-keygen -t rsa -b 4096 -N "" -C "$USER@$HOSTNAME to $1" -f ~/.ssh/"$1_id_rsa"
}

$ ssh_keygen tarranjones@github.com


further reading
alias to switch user.email http://stackoverflow.com/a/33079036/2273611

Another related article in Chinese

http://4simple.github.com/docs/multipleSSHkeys/