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17%
Obtain certificates with acme.sh
27.09.2021
Home »  Archive  »  2021  »  Issue 65: 7 Em...  » 
Lead Image © Stuart Miles, 123RF.com
/.acme.sh/www.example.com/www.example.com.cer -noout -issuer -subject -dates -serial issuer= /C=US/O=Let's Encrypt/CN=R3 subject= /CN=www.example.com notBefore=Feb 21 13:00:28 2021 GMT notAfter=May 22 13:00:28 2021 GMT serial=03B46ADF0F26B94C19443669
17%
Secure and seamless server access
25.09.2023
Home »  Archive  »  2023  »  Issue 77: Secur...  » 
Photo by Michael D on Unsplash
– assuming you have a Cloudflare account and zone: 1. Create a tunnel and collect its secret token. 2. Add a tunnel configuration specifying the tunnel behavior. 3. Add a DNS entry for Tunnel – it has
17%
Building a port scanner in Python
28.07.2025
Home »  Archive  »  2025  »  Issue 88: 5 Net...  » 
Lead Image © Leo Blanchette, 123RF.com
installed on your system. If Python is not installed, you can install it with: sudo apt install python3 With VS Code and the necessary extensions set up, you are now ready to start developing your port
17%
How Upstart boots Ubuntu-based systems
30.11.2025
Home »  Archive  »  2012  »  Issue 07: Xen v...  » 
debuted in Ubuntu 11.10. The initctl show-config command that gives an overview of the jobs has been around since Upstart 0.6.4 (Figure 3): initctl show-config -e > output
17%
ISC 2024 from a Distance
10.06.2024
Home »  HPC  »  Articles  » 
in gigaflops per watt over time. The first Green500 list was in June 2013. The number 1 system used GPUs even then (NVIDIA K20 with QDR InfiniBand). The energy efficiency was 3,208.8Mflops/W (0.32Gflops
17%
Kea, the ISC's successor to the DHCP daemon
03.08.2023
Home »  Archive  »  2023  »  Issue 76: Energ...  » 
Photo by Markus Winkler on Unsplash
in 2014. At the time of writing, the available Kea versions were 2.2.0 (July 2022, Current-Stable) and 2.3.6 (March 2023, Experimental-Development). Most distributions have prebuilt Kea packages
17%
Netcat – The Admin’s Best Friend
20.08.2012
Home »  Articles  » 
 
examplehost.tld 22 If firewalling is in place and you need to originate your connection from a specific IP address to open a port, entering # nc -s 1.2.3.4 examplehost.tld 8181 will connect to examplhost
17%
Netcat – The admin's best friend
31.10.2025
Home »  Archive  »  2012  »  Issue 12: NAS S...  » 
© 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
17%
Manage status messages in CouchDB with MapReduce
27.09.2024
Home »  Archive  »  2024  »  Issue 83: Storage  » 
Photo by Austin Distel on Unsplash
query large amounts of data on distributed systems. CouchDB has been an Apache project since 2008. Version 1.0 in 2010 has evolved into version 3.3 today. "Couch" was originally an acronym for "cluster
17%
Cloud security with AWS GuardDuty
04.08.2020
Home »  Archive  »  2020  »  Issue 58: Graph...  » 
Lead Image © Amy Walters, 123RF.com
grants permissions to enable GuardDuty. If some instances expose ports like 22 or 3389 to the world (0.0.0.0/0), you should soon see some findings of malicious IPs trying to get into your systems

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