Building Public Key, SSH Private Key and Authorized Key

If you are rebuilding the ssh keys for a user who has accidentally destroyed their files inside .ssh directory

Step 1: Generate the Private Key

# ssh-keygen -t rsa

Step 2: Generate the Public Key from Private Key

# ssh-keygen -y -f ~/.ssh/id_rsa > ~/.ssh/

Step 3: Generate the Authorized Key

# cat >> .ssh/authorized_keys

Step 4: Generate Config File

# touch ~/.ssh/config
StrictHostKeyChecking no

HPC-Cloud versus On-Premise HPC Cost Studies

The Magellan Final Report on Cloud Computing for Science

  1. Findings:  Cost Analysis shows that DOE centers are cost competitive, typically 3–7x less expensive, when compared to commercial cloud providers.
  2. Reasons: Existing DOE centers already achieve many of the benefits of cloud computing since these centers consolidate computing across multiple program offices, deploy at large scales, and continuously refine and improve operational efficiency

Evaluating the Suitability of Commercial Clouds for NASA’s High Performance Computing Applications: A Trade Study

  1. Finding 1:
    Tightly-coupled, multi-node applications from the NASA workload take somewhat more time when run on cloud-based nodes connected with HPC-level interconnects; they take significantly more time when run on cloud-based nodes that use conventional, Ethernet-based interconnects.
  2. Finding 2:
    The per-hour full cost of HECC resources is cheaper than the (compute-only) spot price of similar resources at AWS and significantly cheaper than the (compute-only) price of similar resources at POD.
  3. Finding 3:
    Commercial clouds do not offer a viable, cost-effective approach for replacing in-house HPC resources at NASA

Alert on Linux Advanced Package Tool (APT) Remote Code Execution Vulnerability (CVE-2019-3462)

Taken from

A vulnerability (CVE-2019-3462) in the Linux Advanced Package Tool (APT) has been discovered. Successful exploitation of the vulnerability could result in arbitrary code execution with access to privileged administrator “root” on affected Linux systems. APT is a widely used utility that handles installation, update, upgrade and removal of software across many Linux operating system distributions. This vulnerability has been given a Common Vulnerability Score System version 3 severity base score of 8.1 out of 10.

Affected Software
APT versions 1.4.8 and older.

Successful exploitation of this vulnerability could lead to a full compromise of a user’s machine, allowing an attacker to perform malicious activities such as unauthorised installation of programs, creation of rogue administrator accounts and alteration of data.

Affected users and system administrators of Debian, Ubuntu, and other Linux distributions are advised to download and install the security updates immediately.

IBM Spectrum Scale v5 GUI

Management GUI enhancements in IBM Spectrum Scale release 5.0.0

Monitoring and Managing the IBM ESS Using the GUI

Configuring performance metrics and display options in the Statistics page of the GUI


Adding New Application to the Display Manager Portal for PBS-Pro

These are the steps to setup an application to be ready for PBS-Pro Display Manager COnsole

Step 1: Copy and Edit XML Files in the PBS PAS Repository

# cd /var/spool/pas/repository/applications/
# cp -Rv GlxSpheres Ansys

There are 3 important files which you must change the name to the application name

# mv app-inp-GlxSpheres.xml app-inp-Ansys.xml
# mv app-conv-GlxSpheres.xml app-conv-Ansys.xml
# mv app-actions-GlxSpheres.xml app-actions-Ansys.xml

Step 2: Change the inside content of the xml file from the original name (GlxSpheres) to (ANSYS)

# sed -i "s/GlxSpheres/Ansys/g" *.xml

Step 3: Edit site-config.xml to include the new application executable pathing

# cd /var/spool/pas/repository
# vim site-config.xml

Step 4: Updating Icons for the PBS-Pro Display Manager

See Updating Icons for the PBS-Pro Display Manager