sshLxplus.md

Guide for SSH on Lxplus

0. Access Lxplus

ssh -x [email protected]

1. Create an SSH key

Start ssh agent:

eval "$(ssh-agent -s)"
ssh-add -l

create an ssh key:

ssh-keygen -t rsa -b 4096 -C "[email protected]"

When asked for the key location enter:

/afs/cern.ch/user/<U>/<UserName>/.ssh/id_rsa

Fix permissions:

chmod 400 <key_file_location>

Choose a password and add the key:

ssh-add <key_file_location>

2. Add the key to SSH-Keys in your GitHub account

From https://github.com/ go to:

settings -> SSH and GPH keys -> new SSH keys

Paste the content of id_rsa.pub

3. Add a new host to ssh config

Following the instructions here:

https://medium.com/@czarpino/how-to-tell-git-which-ssh-key-to-use-c8574fb243fd

open ~/.ssh/config and configure a new host in the following way:

# ~/.ssh/config
Host repo_<name>
    Hostname github.com
    User git
    IdentityFile ~/.ssh/private_key_name

where private_key_name corresponds to the private key you created in step 1 (id_rsa). and is a name you can choose.

Now, when you clone a github repository use this sintax:

git clone git@repo_<name>:repository_usual_url.git

for example :

git clone git@repo_daniele:latinos/PlotsConfigurations.git

Now you can “tell” Git which SSH credentials to use through SSH config.

4. Set your git local user name

Set a local git user name:

git config  user.name "your_github_name"
git config  user.email "[email protected]"

Do this for every repository you work in.