PBS pre-requisites

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Following pre-requisites are required for PBS to work:

1. Nodes should resolve each other using short-names and FQDN such rocks2, rocks2.local to their private IP. This is taken care of by rocks cluster

   Might require fixing /etc/hosts on compute nodes to point to master FQDN via private IP instead of master public IP

2. There should be password-less SSH between nodes

   Might require using below fix:

   chmod u+s /usr/libexec/openssh/ssh-keysign

3. Install following packages in master and execution nodes:

   yum install -y gcc make rpm-build libtool hwloc-devel libX11-devel libXt-devel libedit-devel libical-devel  ncurses-devel perl postgresql-devel postgresql-contrib python3-devel tcl-devel tk-devel swig expat-devel openssl-devel libXext libXft autoconf automake
   yum install -y expat libedit postgresql-server postgresql-contrib python3 sendmail sudo tcl tk libical

   In case of rocks this requires enabling repositories base, updates, extras and epel on master and also on all compute (execution) nodes.

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