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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
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Bare metal deployment with OpenStack
02.08.2021
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Photo by Anatolii Nesterov on Unsplash
: "16" name: "node1" # ipmitool -H -U -P raw 0x30 0x21 | tail -c 18 | sed 's/ /:/g' To avoid the password specified here appearing in the process list and history
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Monitoring daemons with shell tools
30.11.2025
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© Shariff Che'Lah, 123RF.com
is not accessible! ****************" >> dba.log 15 /usr/local/etc/rc.d/002pgsql.sh start 16 sleep 15 17 psql -U monitor -d monitor -c "select * from watch;" 18 19 if [ $? -eq 0 ]; 20 21 then 22
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Kernel and driver development for the Linux kernel
07.10.2014
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Lead Image © psdesign1, Fotolia.com
_string; 08 09 static int prochello_show( struct seq_file *m, void *v ) 10 { 11 int error = 0; 12 13 error = seq_printf( m, "%s\n", output_string); 14 return error; 15 } 16 17 static int prochello
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Automated OpenStack instance configuration with cloud-init and metadata service
05.02.2019
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Lead Image © jeka81, 123RF.com
', 'makecache'] with allowed return codes [0] (shell=False, capture=False) ... 2018-10-17 22:00:06,125 - util.py[DEBUG]: Running command ['yum', '-t', '-y', 'upgrade'] with allowed return codes [0] (shell
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Single sign-on like the big guys
20.06.2022
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Lead Image © Sergey Nivens, 123RF.com
Once your set of internal applications grows greater than an order of 10s, you can end up in a scenario where credentials storage for each service gets out of control. Users might start complaining
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Mocking and emulating AWS and GCP services
05.08.2024
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Lead Image © Juri Samsonov, Fotolia.com
:4566" - "14510-14559:4510-4559" environment: - DEBUG=${DEBUG:-0} healthcheck: test: ["CMD", "curl", "-I", "localhost:4566/_localstack/health"] interval: 5s timeout: 3s retries
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Nine home clouds compared
05.12.2014
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Lead Image © inertia@intuitivmedia.net
.21 –   EUR5.95 EUR1.00 (with French VAT) EUR2.78 (half price as of year two) – $2.92 License(s) AGPL, commercial GPL, LGPL, AGPL Commercial GPLv3
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High-performance Python – compiled code and C interface
01.08.2019
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Lead Image © Konrad Bak, 123RF.com
total x = numpy.arange(10_000_000); %time sum(x) CPU times: user 1.63 s, sys: 0 ns, total: 1.63 s Wall time: 1.63 s Next, add Numba into the code (Listing 2) so the @jit decorator can be used. (Don
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ESXi ransomware attacks
05.02.2023
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Photo by Afif Ramdhasuma on Unsplash
://www.trendmicro.com/en_us/research/22/e/new-linux-based-ransomware-cheerscrypt-targets-exsi-devices.html Antivirus protection on hypervisors: https://kb.vmware.com/s/article/80768 Ransom letter: https

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