Editing HPC High Processing Cluster in IIT DELHI (section)

=='''Preparation of Master node.'''==

a.First the entries where made in /etc/hosts of each cluster as follows


10.52.3.111 master_node

10.52.3.112node1

10.52.3.113node2

10.52.3.114node3

10.52.3.115node5


b.A group was created and a user who will be responsible for operating cluster was added as follows.


groupadd beowulf

useradd -g beowulf wolf


c.Following line were added in /home/wolf/.bash_profile


umask 007


d.NFS server was created as follows in master node.


mkdir /shared

chmod 770 /shared

chown -R wolf:beowulf /shared 


Following entry is made in /etc/exports file


/wolf * (rw,no_root_squash,sync)


e.Communication among the nodes takes place through ssh, so ssh login for user “wolf” has to be without need of entering the password. This was acheived as follow.


Uncomment the following in /etc/sshd/sshd_config


<nowiki>#RSAAuthentication yes </nowiki>

<nowiki>#AuthorizedKeysFile .ssh/authorized_keys</nowiki>


f.Reboot and login as wolf because operation of cluster will always be done by user “wolf”


g.To generate your public and private SSH keys, do this:


ssh-keygen -b 1024 -f ~/.ssh/id_rsa -t rsa -N "" 


This will generate the two public/private key pain in .ssh directory. Copy the id_rsa.pub file into a file called "authorized_keys" right there in the .ssh directory.This key will be used later. Modify the security of file and directory


chmod 644 ~/.ssh/auth* 

chmod 755 ~/.ssh


h.Add these entries is /home/wolf/.bash_profile


export LAMRSH='ssh -x' 

ssh-agent sh -c 'ssh-add && bash'