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100%
Monitoring network computers with the Icinga Nagios fork
30.11.2025
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© Alterfalter, 123RF.com
active_checks_enabled 1 22 passive_checks_enabled 0 23 check_command check_ssh 24 max_check_attempts 3 25
94%
A simple approach to the OCFS2 cluster filesystem
30.11.2025
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© Kheng Ho Toh, 123RF.com
_dlm] root 3467 7 0 20:07 ? 00:00:00 [o2net] root 3965 7 0 20:24 ? 00:00:00 [ocfs2_wq] root 7921 7 0 22:40 ? 00:00:00 [o2hb-BD5A574EC8] root 7935 7
94%
Using Expect scripts to automate tasks
31.10.2025
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© Kheng Ho Toh, 123RF.com
conservatively originally 21 if {$force_conservative} { 22 set send_slow {1 .1} 23 proc send {ignore arg} { 24 sleep .1 25 exp_send -s -- $arg 26 } 27 } 28
94%
ARP cache poisoning and packet sniffing
30.11.2025
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© elisanth, 123RF.com
Destination MAC address Listing 1 Nemesis arp Packets 01 $ while true 02 > do 03 > sudo nemesis arp -v -r -d eth0 -S 192.168.1.2 -D 192.168.1.133 -h 00:22:6E:71:04:BB -m 00:0C:29:B2
89%
Checking password complexity with John the Ripper
30.11.2025
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, 378501 c/s virtual 18 Long: 1063K c/s real, 1063K c/s virtual 19 20 Benchmarking: LM DES [64/64 BS]... DONE 21 Raw: 8214K c/s real, 8214K c/s virtual 22 23 Benchmarking: NT MD4 [Generic 1x]... DONE 24
89%
Monitor your nodes with collectl
30.11.2025
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© nobeastsofierce, 123RF.com
YZCD 03 # DaemonOpts: -f /var/log/collectl -r00:00,7 -m -F60 -s+YZCD --iosize 04 ################################################################################ 05 # Collectl: V3.6.1-4 HiRes: 1 Options
87%
Reading and understanding database execution plans
31.10.2025
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© Gunnar Pippel, 123RF.com
"."EUR_VALUE">=10) 26 3 - access<+>6<+>( "S"."SALE_DATE">TRUNC(SYSDATE@!) 27 -INTERVAL'+00-06' YEAR(2) TO MONTH) 1  The explain plan for command only stores the execution plan in the PLAN_TABLE. 2  The DBMS
87%
Storage system with OpenSolaris and Comstar
30.11.2025
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Aleksandr Fomenkov, 123RF.com
stmf 23 # stmfadm add-view -t myfcserver -h myfcclient -n 1 600144f021ef4c0000004bcb3fb70001 This process provides a logical unit with a LUN of 1 for the client with a WWPN of 50:06:0b:00:00:c2
86%
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
86%
An IT nomad's daily diary
30.11.2025
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© Kateryna Pruchkovska, 123RF.com
magazine [3]. In other words, the many Cobbler system records are really the biggest problem. Just to jog your memory: Using system records, Cobbler can create an individual PXE configuration file for each

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