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30.11.2025

Home » Archive » 2011 » Issue 6: Perfor... »

total = summary.values.inject(0) { |sum, i| sum += i } 12 puts "Found #{total} instances in the following states:" 13 summary.keys.sort.each do |s| 14 printf "%20s %d\n", s, summary[s] 15 end 16 puts

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Moving HPC to the cloud

31.10.2025

Home » Archive » 2012 » Issue 11: Cloud... »

of options, including dual four-core Xeon, dual six-core Xeon, or quad 12-core AMD processors ranging in speed from 2.2 to 2.9GHz with 24 to 128GB of RAM per server and up to 1TB of scratch local storage per

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pdsh Parallel Shell

08.07.2018

Home » HPC » Articles »

The pdsh parallel shell tool lets you run a command across multiple nodes in a cluster. ... seconds set connect timeout (default is 10 sec) -u seconds set command timeout (no default) -f n use fanout of n nodes -w host,host,... set target node list on command line -x ... The pdsh parallel shell tool lets you run a command across multiple nodes in a cluster.

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Protecting your web application infrastructure with the Nginx Naxsi firewall

18.07.2013

Home » Archive » 2013 » Issue 15: What’... »

backend3.example.com server; 05 backend4.example.com server down; 06 backend5.example.com backup server; 07 } 08 09 upstream fallback { 10 fallback1.example.com server: 8081; 11 } 12 13 14 server { 15 % 16

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Moving your data – It's not always pretty

18.07.2013

Home » Archive » 2013 » Issue 15: What’... »

to NFS-export the storage to the data mover. Then, just copy the data between mountpoints. For example: $ cp -a --preserve=all -r /old_storage/data /new_storage/data Be warned that if you use NFS, you

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I/O benchmarks with Fio

30.11.2025

Home » Archive » 2011 » Issue 5: Pen Te... »

workload is pretty time-consuming. The current version of Fio is 1.57. I have created a package for Debian that the Ubuntu developers integrated into Ubuntu. If you have SUSE versions since SLES 9 and open

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Let the Editor Wars Begin!

25.08.2016

Home » HPC » Articles »

and the other active members of the nano project decided to leave the GNU project, leaving GNU nano intact but taking active development outside of GNU (a fork). This move was taken because of their objections

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Comparing Ceph and GlusterFS

21.04.2015

Home » Archive » 2014 » Issue 23: 10 Ti... »

-r--r-- 2 root root 6 3. Feb 18:36 .glusterfs/0d/19/0d19fa3e-5413-4f6e-abfa-1f344b687ba7 # # ls -alid dir1 .glusterfs/fe/9d/fe9d750b-c0e3-42ba-b2cb-22ff8de3edf0 .glusterfs /00

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Automate CentOS and RHEL installation with PXE

02.02.2021

Home » Archive » 2021 » Issue 61: Secur... »

timezone 19 timezone Europe/Vienna --isUtc --ntpservers 172.23.48.8,172.23.48.9 20 # user setup 21 user --name=example-user --password= --iscrypted --gecos="example-user" 22 # Disk partitioning

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Keeping Docker containers safe

13.02.2017

Home » Archive » 2017 » Issue 37: Distr... »

sitting attentively waiting for an attack; instead, a user with much less system access listens. You can find out more about privilege separation online if you're interested [9]. In Figure 2, you can see

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