GEN220_2020

2020 Edition of the Class

Project maintained by biodataprog Hosted on GitHub Pages — Theme by mattgraham

Some help on SSH keys

Read the chapter 4 from Vince Buffalo’s book.

Also see information on setting up SSH keys via github. Generating SSH keys

$ ssh-keygen -t rsa -b 4096 -C "youremail"
# you will be prompted for a password - this is not your login password but a new password
# you can use for unlocking your keypair

Generates a ssh key pair on your laptop
Need to copy ~/.ssh/id_rsa.pub to cluster.hpcc.ucr.edu

[YOURLAPTOP] $ scp  ~/.ssh/id_rsa.pub YOURNAME@cluster.hpcc.ucr.edu:.ssh/mylaptopkey.pub
[YOURLAPTOP] $ ssh YOURNAME@biocluster.ucr.edu
[hpcc] $ cd .ssh
[hpcc] $ cat mylaptopkey.pub >> authorized_keys
[hpcc] $ chmod 644 authorized_keys
[hpcc] $ logout
$ ssh YOURNAME@cluster.hpcc.ucr.edu
# should prompt you for your SSH key password

On your laptop enable local caching of the ssh key password by doing

$ ssh-add
password:
$ ssh  YOURNAME@biocluster.ucr.edu
# now no password requested!

Can edit ~/.ssh/config to setup aliases, preset the user name and simplify

$ cat ~/.ssh/config
ForwardX11 yes
ForwardX11Trusted yes
ForwardAgent yes

Host hpcc
 Hostname cluster.hpcc.ucr.edu
 User MYUSERNAME
 ServerAliveInterval 10

Can just use ssh hpcc now instead of ssh MYUSERNAME@cluster.hpcc.ucr.edu

Using Public SSH keys

The public SSH keys from your laptop and one on biocluster can be uploaded to github for easier checkin / checkout authentication via SSH instead of HTTPS

Use this public key (id_rsa.pub) to your github account https://help.github.com/en/articles/adding-a-new-ssh-key-to-your-github-account. Note that you can create multiple keys and have one pair for your laptop and another for HPCC. All of them can be added to github to enable check outs.

GEN220_2020

Setting up ssh keys for passwordless login

Using Public SSH keys