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48%
Debugging the Linux kernel with the Qemu emulator
30.11.2025
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© Daniela Mangiuca, 123RF.com
:add-symbol-file module.ko text_address -s .data data_address -s .bss bss_address 9. Debug: Set breakpoints and so on. In Toolchain , enable the Build gdb for the Host option; in Kernel | Kernel version , type 3.2
48%
Monitoring your cluster with a home-grown OCF agent
30.11.2025
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© Aleksey Mnogosmyslov, 123RF.com
_RESKEY_user doesn't exist" 20 return $OCF_ERR_INSTALLED 21 fi 22 23 getent group $OCF_RESKEY_group >/dev/null 2>&1 24 rc=$? 25 if [ $rc -ne 0 ]; then 26 ocf_log err "Group $OCF
48%
Netcat – The admin's best friend
31.10.2025
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© Dmitry Rukhlenko, 123RF.com
'll take a quick look at a TCP port range. For example, you might want to use netcat (nc) to check FTP ports – or at least ports in that region: # nc -v -z examplehost.tld 21-25 If you want to change
48%
Using the Expect scripting environment
30.11.2025
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© Ivan Mikhaylov, 123RF.com
} 19 20 -re "($|%|>) " { interact } 21 22 timeout { 23 send_tty "No response from $host\n" 24 exit 25 } 26 } The script begins as usual by saving its arguments into variables
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A standard cloud computing API
30.11.2025
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few years, including Amazon Elastic Compute Cloud (EC2), Amazon Simple Storage Service (S3), and JiffyBox. In the US, these vendors are joined by providers such as GoGrid, Rackspace, and Terremark
47%
High availability clustering on a budget with KVM
30.11.2025
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Yulia Saponova, 123RF.com
for the configuration step: # pvcreate /dev/sdb1 # vgcreate vg_cluster /dev/sdb1 # lvcreate -n lv_vm1 -L 50G vg_cluster # lvcreate -n lv_vm2 -L 50G vg_cluster The first command deposits the required LVM signature
47%
Getting started with I/O profiling
30.11.2025
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© Photosani, Fotolia.com
2: Per-file writes (MB) for all input files. The solid blue line is the average amount written in megabytes across all files. The two dashed blue lines show +/-1 SD. (Figure 8 from the MPI strace
47%
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
47%
Warding off the rise of VoIP spam
30.11.2025
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Izaokas Sapiro, 123RF.com
. Listing 1 A SIP Request 01 INVITE sip:bob@tuwien.ac.at SIP/2.0 02 Via: SIP/2.0/UDP myhost.myprovider.de;branch=z9hG4bK776asdhds 03 ... 04 To: Bob 05 ... 06 From: Alice
47%
Checking password complexity with John the Ripper
30.11.2025
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-incremental:lanman passfile.txt 02 Loaded 2 passwords with 2 different salts (FreeBSD MD5 [32/64]) 03 guesses: 0 time: 1:04:04:08 (3) c/s: 10927 trying: gmugoky - gmugok2 04 guesses: 0 time: 1:09:25:10 (3

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