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100%

Monitoring network computers with the Icinga Nagios fork

30.11.2025

Home » Archive » 2010 » Issue 1: System... »

16 monday 07:00-17:00 17 tuesday 07:00-17:00 18 wednesday 07:00-17:00 19 thursday 07:00-17:00 20

89%

Time flies, but it can still be measured

31.10.2025

Home » Archive » 2012 » Issue 12: NAS S... »

$ /usr/bin/time stress --cpu 2 -t 1 stress: info: [10050] dispatching hogs: 2 cpu, 0 io, 0 vm, 0 hdd stress: info: [10050] successful run completed in 1s 1.00 real 1.81 user 0.00

89%

Using Expect scripts to automate tasks

31.10.2025

Home » Archive » 2012 » Issue 12: NAS S... »

23171 0 Oct07 ? 00:00:00 /usr/sbin/apache2 -k start\r 79 www-data 558 23171 0 Oct07 ? 00:00:00 /usr/sbin/apache2 -k start\r 80 www-data 559 23171 0 Oct07 ? 00:00:00 /usr

77%

I/O benchmarks with Fio

30.11.2025

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

Drive: http://kb.fusionio.com/KB/a29/verifying-linux-system-performance.aspx IOPS section in the I/O performance measurement: http://www.thomas-krenn.com/de/wiki/Messen_von_I/O_Performance#IOPS (in German

74%

Give your servers the once over with Nmap

31.10.2025

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

ADDRESS [Cut first seven hops for brevity] 8 10.59 so-4-2-0.mpr3.pao1.us.above.net (64.125.28.142) 9 11.00 metro0.sv.svcolo.com (208.185.168.173) 10 9

71%

Connecting dissimilar IPsec implementations

30.11.2025

Home » Archive » 2011 » Issue 4: Secure... »

:31:40: [6694] DEBUG: (lifebyte = 0:0) 04 2011-01-28 17:31:40: [6694] DEBUG: enctype = 7:7 05 2011-01-28 17:31:40: [6694] DEBUG: (encklen = 128:128) 06 2011-01-28 17:31:40: [6694] DEBUG: hashtype = SHA:SHA 07

70%

Moving HPC to the cloud

31.10.2025

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

[5]. I proposed two usage cases. The first was for a small case consisting of 80 cores with 4GB of RAM per core with basic storage of 500GB. POD pricing is based on cores/hour and would work out

69%

High-availability workshop: GFS with DRBD and Pacemaker

30.11.2025

Home » Archive » 2012 » Issue 07: Xen v... »

resource: sudo mkfs.gfs2 -p lock_dlm -j2 -t pcmk:pcmk resource resource is the DRBD resource device node – for example, /dev/drbd/by-res/disk0/0 . What's missing now is the filesystem resource

68%

Beyond monitoring: Mathematical load simulation in Perl

30.11.2025

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

Model"; 11 $work = "ebiz-tx"; 12 $node1 = "WebServer"; 13 $node2 = "AppServer"; 14 $node3 = "DBMServer"; 15 $think = 0.0 * 1e-3; # as per test system 16 $dtime = 2.2 * 1e-3; # dummy service time 17 18

67%

Get the best out of your bandwidth with tc

30.11.2025

Home » Archive » 2012 » Issue 10: Traff... »

can also handle this situation perfectly. Of course, this approach could be applied to port 80 (for HTTP traffic) or port 25 (for SMTP traffic) with minor changes. Another scenario for tc might be when

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