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--- exercises:2016_uzh_cmest:login [2016/09/22 09:06] – [Make module loading persistent] tmueller
+++ exercises:2016_uzh_cmest:login [2020/08/21 10:15] (current) – external edit 127.0.0.1
@@ Line 153: / Line 153: @@
 ==== 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 through the the ''module'' command, simply execute the following **once**:
+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>
@@ Line 159: / Line 159: @@
 </code>
-after that you can add and remove modules to be loaded at startup using ''module initadd'' or ''module initrm''. For example:
+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>
@@ Line 166: / Line 168: @@
 </code>
-to remove ''vmd'' from the list of modules to load at login:
+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>