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What is Digital Twin?

This article is taken from What is a digital twin? A real-time, virtual representation

Digital twins are real-time, virtual representations of objects, processes, and systems. While digital twins can represent purely digital things, they most frequently serve as a bridge between the physical and digital domains. For example, a digital twin could provide a digital view of the operations of a factory, communications network, or the flow of packages through a logistics system.

“The implementation of a digital twin is an encapsulated software object or model that mirrors a unique physical object, process, organization, person, or other abstraction,” according to Gartner. “Data from multiple digital twins can be aggregated for a composite view across a number of real-world entities, such as a power plant or a city, and their related processes.”

What is a digital twin? A real-time, virtual representation
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curl: (28) Resolving timed out after 5515 milliseconds

If you encounter an error like curl: (28) Resolving timed out after 5515 milliseconds

[user1@hpc-node1 ~]# curl -fsS https://dlang.org/install.sh | bash -s dmd
curl: (28) Resolving timed out after 5515 milliseconds
curl: (28) Resolving timed out after 5512 milliseconds
curl: (28) Resolving timed out after 5514 milliseconds
curl: (28) Resolving timed out after 5513 milliseconds
curl: (28) Resolving timed out after 5514 milliseconds
curl: (28) Resolving timed out after 5514 milliseconds
curl: (28) Resolving timed out after 5515 milliseconds
curl: (28) Resolving timed out after 5514 milliseconds
curl: (28) Resolving timed out after 5515 milliseconds
curl: (28) Resolving timed out after 5515 milliseconds

It is likely a DNS Lookup Resolution Issue. You might want to take a look at /etc/resolv.conf . you may want to change the DNS to another nameserver that resolves faster like one from Google Public DNS IP Addresses

# Generated by NetworkManager
nameserver 192.168.0.1

To another nameserver, maybe like Google Public DNS IP Addresses. You can find more information at https://developers.google.com/speed/public-dns/docs/using

# Generated by NetworkManager
nameserver 8.8.8.8
nameserver 8.8.4.4
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Apache Log4j Zero-Day Vulnerability

Taken from https://www.lunasec.io/docs/blog/log4j-zero-day/

What is Apache Log4j Zero-Day Vulnerability?

Apache Log4j has a serious unauthenticated Remote Code Execution (RCE) vulnerability which was just disclosed. The exploit code for this has also been released, and the vulnerability is actively exploited in the wild. By crafting a special string that is passed to the application/service log via Log4j, attackers can execute arbitrary code loaded from remote servers. This can potentially lead to a complete compromise of the server.

What versions are vulnerable?

Any software using Apache Log4j (as a component) version between 2.0 and 2.14.1, inclusive.

What do I need to do?

A. Servers running custom Java application/services

  1. If your Log4j version is vulnerable, install the latest patched version log4j-2.15.0-rc2 available on GitHub at https://github.com/apache/logging-log4j2/releases/tag/log4j-2.15.0-rc2.

B. Servers running Commercial off-the-shelf (COTS) products

  1. Plese refer to https://gist.github.com/SwitHak/b66db3a06c2955a9cb71a8718970c592 for a list of advisories from the major vendors and follow the advisory.

How can I check if I have been hacked/compromised?

Check your applications’ log files for strings resembling “jndi:ldap”.

For more information

See https://www.lunasec.io/docs/blog/log4j-zero-day/

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Quantum Race between US, China and EU

This article is taken from Where does EU stand in the quantum computing race with China and US?

Researchers at the University of Innsbruck have built the smallest quantum computer yet, prompting questions if European outfits can take on the leading pack.

A notable feature of the compact quantum computer is its low power consumption, which stands at 1.5 kilowatts – the same amount of energy needed to power a kettle. “Indeed, such is its low power consumption, that the researchers in the University of Innsbruck are exploring how to power the device using solar panels.”

Another decisive factor for the industrial use of quantum computers is the number of available qubits. The Innsbruck physicists were able to run the quantum computer with 24 fully functional qubits – individually controlling and entangling 24 trapped ions with their device – meeting a recent target set by the German government with surprising speed.

Where does EU stand in the quantum computing race with China and US?

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Software Rendering Mode for Fluent Launcher

When running Fluent from inside ANSYS Workbench on Linux. Hardware graphics rendering can fail and the Fluent application failed to start. This error can sometimes be prevented by switching to the software rendering mode. There are 2 approaches

Before Running Workbench, you may want to put this in your BASH Shell

% export HOOPS_PICTURE=x11/lin

In C Shell

% setenv HOOPS_PICTURE x11/lin

If you are using Fluent Launcher

Steps:

Open a Fluent set of cells
Right Click the Fluent setup cell and choose, edit
In the resulting Fluent launcher, choose +, Show More Options
Select the Environment tab
Add the following entry
HOOPS_PICTURE=x11/lin

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The Future of Power-Efficient Datacenters

Submer is not only obsessed with Immersion Cooling, but also looks at the entire ecosystem surrounding datacenters for possible points of optimization. In this educational and informative webinar, we were joined by John Laban, from the Open Compute Project Foundation (OCP).

John helped us identify all points of electricity waste in the delivery of power to datacenters and HPC installations.