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exercises:2016_uzh_cmest:login [2016/09/22 08:54]
tmueller
exercises:2016_uzh_cmest:login [2016/09/22 09:48] (current)
tmueller
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 +===== Part III: Advanced account configuration =====
 +
 +==== Make module loading persistent ====
 +
 +Upon login, the shell (''​bash''​ in our case) executes a number of files if they exist. One of them is the ''​.bashrc''​. To prepare it for management using the the ''​module''​ command, simply execute the following **once**:
 +
 +<​code>​
 +$ echo '​module load ' >> ~/.bashrc
 +</​code>​
 +
 +after that you can add and remove modules to be loaded at startup using ''​module initadd''​ or ''​module initrm''​.
 +
 +To add ''​vmd''​ and ''​cp2k'',​ run for example:
 +
 +<​code>​
 +$ module initadd vmd
 +$ module initadd cp2k/​r17408_2016_09_19
 +</​code>​
 +
 +to remove ''​vmd''​ again from the list of modules to load:
 +
 +<​code>​
 +$ module initrm vmd
 +</​code>​
 +
 +Alternatively you can of course simply edit ''​.bashrc''​ using your favorite editor and add a line like ''​module load vmd cp2k/​r17408_2016_09_19''​ by yourself.
 +
 +==== Setup key-based authentication ====
 +
 +To avoid having to type the password every time you log in (and to increase the security), keys can be used for authentication instead. The following instructions are **for OSX and Linux**.
 +
 +First generate a key-pair **on your local machine** using
 +
 +<​code>​
 +$ ssh-keygen
 +</​code>​
 +
 +and accept the defaults proposed and do not set a password.
 +
 +Upload the public key **from your local machine** to tcopt3:
 +
 +<​code>​
 +$ scp ~/​.ssh/​id_rsa.pub studentXX@tcopt3.chem.uzh.ch:​~/​
 +</​code>​
 +
 +Now login to ''​tcopt3.chem.uzh.ch''​ and move the uploaded public key to the right place:
 +
 +<​code>​
 +$ mkdir -p .ssh
 +$ chmod 0700 .ssh
 +$ mv id_rsa.pub .ssh/​authorized_keys
 +</​code>​
 +
 +When connecting to the server **from your local machine** now, use:
 +
 +<​code>​
 +$ ssh -i ~/​.ssh/​id_rsa studentXX@tcopt3.chem.uzh.ch
 +</​code>​
 +
 +==== Simplify the login ====
 +
 +The following instructions apply **apply to OSX and Linux**.
 +
 +**On your local machine** add the following part to the file ''​.ssh/​config''​ in your home directory:
 +
 +<​code>​
 +Host tcopt3
 +  HostName tcopt3.chem.uzh.ch
 +  User studentXX
 +</​code>​
 +
 +after which you will be able to connect to ''​tcopt3''​ simply by using
 +
 +<​code>​
 +$ ssh tcopt3
 +</​code>​
 +
 +If you have setup key-based authentication as shown above, augment the entry to the following instead, to always use key-based authentication without having to specify ''​-i ~/​.ssh/​id_rsa''​ manually:
 +
 +<​code>​
 +Host tcopt3
 +  HostName tcopt3.chem.uzh.ch
 +  User studentXX
 +  IdentityFile ~/​.ssh/​id_rsa
 +  IdentitiesOnly yes
 +  PreferredAuthentications publickey
 +</​code>​
exercises/2016_uzh_cmest/login.1474534457.txt.gz ยท Last modified: 2016/09/22 08:54 by tmueller