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Give your servers the once over with Nmap
31.10.2025
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© ragsac, 123RF.com
.nmap.org (64.13.134.52): Not shown: 994 filtered ports PORT STATE SERVICE VERSION 22/tcp open ssh OpenSSH 4.3 (protocol 2.0) 25/tcp closed smtp
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Creating KVM machines with BoxGrinder and VMBuilder
31.10.2025
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© yewkeo, 123RF.com
of Ubuntu on the virtual machine. The virtual machine uses one CPU (core) and 128MB of RAM. The filesystem is created as a QCOW2 image file of 4GB. Of these, 3GB are reserved for the system partition
98%
Comparing 5 to 50TB NAS storage boxes
31.10.2025
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© Franck Boston, fotolia.com
, 16MB cache, SATA interface. The Buffalo and Netgear models were delivered with pre-installed disks and did not give us the option of using 2.5-inch disks. For our benchmarks, we configured all
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Security without firewalls
31.10.2025
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© rukanoga, 123RF.com
software, Postfix [2]. The story goes that the talented Venema needed to keep track of attacks on workstations at a university and wrote a piece of software capable of limiting port access by rules
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Creating and evaluating kernel crash dumps
31.10.2025
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© Giuseppe Ramos, 123RF.com
kernel sles:~ # grep crash /proc/cmdline root=/dev/disk/by-uuid/10a83ffe-5a9f-48a2-b8cb-551c2cc6b42d resume=/dev/sda3 splash=silent text showopts crashkernel=128 sles:~ # /etc/init.d/boot.kdump status
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openlava – Hot resource manager
31.10.2025
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© Konrad Bak, 123RF.com
node, n0001, is my first compute node. Note that I used the defaults after the node name. Listing 2 Main Cluster Config File [root@test1 etc]# more lsf
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Netcat – The admin's best friend
31.10.2025
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© Dmitry Rukhlenko, 123RF.com
'll take a quick look at a TCP port range. For example, you might want to use netcat (nc) to check FTP ports – or at least ports in that region: # nc -v -z examplehost.tld 21-25 If you want to change
92%
Dynamic routing in Linux with Quagga
31.10.2025
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© petrol, 123RF.com
with the Zebra Routing Daemon by Japanese developer Kunihiro Ishiguro [2]. The software is included in all popular Linux distributions and also runs on Unix derivatives like Solaris and Free/Net/OpenBSD. Quagga