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Give your servers the once over with Nmap
31.10.2025
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© ragsac, 123RF.com
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
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Security without firewalls
31.10.2025
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© rukanoga, 123RF.com
some IP addresses to connect /etc/hosts.allow, the file would simply look like this: sshd: 10.10.10.10, 1.2.3.4, 21.21.21.21 TCP Wrappers works nicely, even if you change the standard SSH port (it
92%
openlava – Hot resource manager
31.10.2025
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© Konrad Bak, 123RF.com
_NAME type model cpuf ncpus maxmem maxswp server RESOURCES test1 DEFAULT DEFAULT 1.0 4 7363M 13999M Yes () n0001 UNKNOWN UNKNOWN_ 1.0 3 2887M - Yes () The bhosts
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Building a custom Cyberdeck
07.10.2025
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Lead Image © Lucy Baldwin, 123RF.com
and controls [9] [10]. I selected a Pimoroni HyperPixel 4-inch TFT display (Figure 5), on account of its higher resolution (800x480, 18-bit color, 60 frames per second), as the best option for a compact, high
91%
Netcat – The admin's best friend
31.10.2025
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© Dmitry Rukhlenko, 123RF.com
seconds, for example: # nc -p 16000 -w 30 examplehost.tld 22 If firewalling is in place and you need to originate your connection from a specific IP address to open a port, then you can enter: # nc -s 1.2.3
91%
Dynamic routing in Linux with Quagga
31.10.2025
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© petrol, 123RF.com
password 8 ZDF339a.20a3E 05 log file /var/log/quagga/zebra.log 06 service password-encryption 07 ! 08 interface eth0 09 multicast 10 ipv6 nd suppress-ra 11 ! 12 interface eth1 13 ip address 10
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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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Moving HPC to the cloud
31.10.2025
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© Zarko Cvijovic, 123RF.com
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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Compressed Archives for User Projects
11.08.2025
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.gz.orig     4 drwxrwxr-x  2 laytonjb laytonjb     4096 Aug  2 09:55 DATA1     4 drwxr-x--- 18 laytonjb laytonjb     4096 Aug  2 10:06 ..     4 drwxrwxr-x  3 laytonjb laytonjb     4096 Aug  2 10:06 . 31152 -rw