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77%
Monitoring virtualization environments with Nagios and Icinga
30.11.2025
Home »  Archive  »  2010  »  Issue 2: Backup...  » 
Sergej Khackimullin, 123RF
will typically need to monitor the system load and I/O performance on Windows systems, too. The typical approach here is to use NSClient++ agents [3] and the matching server plugins: check_nt [4] or check
77%
ARP cache poisoning and packet sniffing
30.11.2025
Home »  Archive  »  2011  »  Issue 6: Perfor...  » 
© elisanth, 123RF.com
traffic normally unavailable because of layer 2 switching. Arpspoof [3] is much simpler than ettercap for redirecting packets: # arpspoof -i eth0 -t host Specifying the interface is optional
76%
I/O benchmarks with Fio
30.11.2025
Home »  Archive  »  2011  »  Issue 5: Pen Te...  » 
© Kheng Ho Toh, 123RF.com
.intel.com/content/www/us/en/solid-state-drives/ssd-320-specification.html XFS FAQ tuning question: http://xfs.org/index.php/XFS_FAQ#Q:_I_want_to_tune_my_XFS_filesystems_for_.3Csomething.3E "SSD ... Fio can help you measure performance by simulating different loads and measuring bandwidth, I/O operations per second, latency, and CPU load. ... I/O benchmarks with Fio
76%
Introduction to behavior-driven monitoring
30.11.2025
Home »  Archive  »  2011  »  Issue 3: Are yo...  » 
Mariya Herasymenko, 123RF
a login to http://www.xing.com/. Listing 3 Login Check 01 ./features/www.xing.com/login.feature 02 Feature: www.xing.com 03 I should be able to login on http://www.xing.com/ 04 05 Scenario ... 3
76%
Galera Cluster for MySQL
30.11.2025
Home »  Archive  »  2012  »  Issue 10: Traff...  » 
© Noel Powell, fotolia.com
temporarily with Listing 5 Error Messages sh: /sbin/ifconfig: Permission denied 120405 8:29:02 [ERROR] WSREP: Failed to read output of: '/sbin/ifconfig | \ grep -m1 -1 -E '^[a-z]?eth[0
75%
Strategies for routing voice calls around a firewall
30.11.2025
Home »  Archive  »  2010  »  Issue 0: Active...  » 
gnohz, 123RF.com
. It supports several media codecs (you can tell this by the SDP header m=audio 3456 RTP/AVP 0 1 3 99 ) and has an open socket for media, pc33.atlanta.com:3456 . Because Alice does not know on which host Bob has
75%
High availability clustering on a budget with KVM
30.11.2025
Home »  Archive  »  2010  »  Issue 0: Active...  » 
Yulia Saponova, 123RF.com
_type /etc/lvm/lvm.conf 03 locking_type = 3 Configuration Before configuring the virtual systems, you'll need to set up the iSCSI system. iSCSI is a method defined in RFC 3720 that transfers legacy
74%
An IT nomad's daily diary
30.11.2025
Home »  Archive  »  2011  »  Issue 6: Perfor...  » 
© Kateryna Pruchkovska, 123RF.com
I've just completed my first meeting with customers, and they look happy enough but not totally convinced. Maybe they're wondering whether I have bitten off more than I can chew. After all, I'm
73%
Penetration testing and shell tossing with Metasploit
30.11.2025
Home »  Archive  »  2012  »  Issue 09: Windo...  » 
© Jean-Marie Guyon, 123RF.com
environment, the tools that professional attackers use [3], and how intruders hide malicious files from virus scanners [4]. In this article, I will walk you through using the latest version of the Nessus pre
73%
Monitor your nodes with collectl
30.11.2025
Home »  Archive  »  2012  »  Issue 09: Windo...  » 
© nobeastsofierce, 123RF.com
Commands = -f /var/log/collectl -r00:00,7 -m -F60 -s+YZCD --iosize These options allow me to monitor CPU, disk, and network in brief mode and slab, processes, and disk in detailed mode. I also added the ability

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