Category Archives: Technical

General Technical information

Finding linux distro release info

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Fedora Core: /etc/fedora-release

Red Hat: /etc/redhat-release, /etc/redhat_version (rare)

via release-files.

I got confused between two Centos VMs.  I had thought one Centos VM that I have running DNS was Centos 5.4 and the new one was Centos 5.6.  When I saw that they both used a 2.6.18.* kernel I got confused.  Fedora Core is using 2.6.35 and greater.  This led me to check the distro version upon which I didn’t get it out of uname -a or dmesg.  Searching the intertubes and I got the above answer.  Apparently the VM I thought was 5.4 is really 5.5.

It is interesting that Centos, which tracks RHEL, doesn’t make too many radical changes to the kernel.

Update: It should be noted that I wouldn’t have noticed the kernel versions had I not tried to compile and install my own kernel.

Internet Real Time Lab (IRT)

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The Internet Real-Time Lab (IRT) in the Computer Science Department at Columbia University conducts research in the areas of Internet and multimedia services: Internet telephony, wireless and mobile networks, streaming, quality of service, resource reservation, dynamic pricing for the Internet, network measurement and reliability, service location, network security, media on demand, content distribution networks, multicast networks and ubiquitous and context-aware computing and communication.

via Internet Real Time Lab (IRT) – Home.

Texas Advanced Computing Center

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When completed, Stampede will comprise several thousand Dell “Zeus” servers with each server having dual 8-core processors from the forthcoming Intel® Xeon® Processor E5 Family (formerly codenamed “Sandy Bridge-EP”) and each server with 32 gigabytes of memory. This production system will offer almost 2 petaflops of peak performance, which is double the current top system in XD, and the real performance of scientific applications will see an even greater performance boost due to the newer processor and interconnect technologies. The cluster will also include a new innovative capability: Intel® Many Integrated Core (MIC) co-processors codenamed “Knights Corner,” providing an additional 8 petaflops of performance. Intel MIC co-processors are designed to process highly parallel workloads and provide the benefits of using the most popular x86 instruction set. This will greatly simplify the task of porting and optimizing applications on Stampede to utilize the performance of both the Intel Xeon processors and Intel MIC co-processors.

via Texas Advanced Computing Center.

DOORS

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rcm2 limited has considerable experience and expertise in Systems Engineering/System Integration processes, Requirements Management processes and IT tools, in particular the DOORS database from Telelogic. We have a number of DOORS licenses that are shared among our DOORS User Group for various client projects and internal consultancy as well as bespoke solutions.

via DOORS (Dynamic Object-Oriented Requirements System).

Welcome to MariaDB! – MariaDB

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MariaDB is a database server that offers drop-in replacement functionality for MySQL. MariaDB is built by some of the original authors of MySQL, with assistance from the broader community of Free and open source software developers. In addition to the core functionality of MySQL, MariaDB offers a rich set of feature enhancements including alternate storage engines, server optimizations, and patches.

via Welcome to MariaDB! – MariaDB.

ERROR 1130 (HY000): Host ‘hostname’ is not allowed to connect to this MySQL server

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After a bit of research, the fix in my case was to “GRANT” user root to connect to MySQL on any hosts. By default, user “root” was only allowed to connect to localhost and 127.0.0.1 hosts of MySQL.

#GRANT ALL PRIVILEGES ON *.* TO ‘root’@’%’ IDENTIFIED BY ‘<roots-password>’ WITH GRANT OPTION;

via ERROR 1130 (HY000): Host ‘hostname’ is not allowed to connect to this MySQL server – kuber’s posterous.