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14.08.2017

Home » Archive » 2017 » Issue 40: Lean... »

-A INPUT -p tcp -s [IP address of allowed server] --dport 22 -j ACCEPT on the server to which you want to SSH. Trick 2: Copying Files Securely The SSH protocol also includes Secure Copy (SCP

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Chronicles

30.05.2021

Home » Archive » 2021 » Issue 63: Autom... »

can't be bothered to do what's right, although it's your responsibility to be sure they do. That sounds a lot like a classic catch-22 situation. Although, I never read the book or saw the movie, I

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Modularize websites with Web Components

09.04.2019

Home » Archive » 2019 » Issue 50: Bpfilter »

Lead Image © Andrey Prokhorov, fotolia.com

. The AnotTitle class resolves the user-defined element in line 11 of Listing 4. The design pattern for is used again when creating the Web Components. In line 9, the template uses 3

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Gatling load-testing tool

03.02.2022

Home » Archive » 2022 » Issue 67: syst... »

to a singleton than a normal Java or C++ class. You don't have to be a Scala programmer to enjoy the freedom that Gatling provides. Most developers, despite having a favorite language or toolset, can easily learn

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Backup and replicate VMs on VMware ESXi

13.06.2016

Home » Archive » 2016 » Issue 33: IPv6... »

the option --backup-vms=VM1,VM2,VM3, which defines which VMs you want XSIBackup to replicate. Additionally, you can define whether the backup solution should overwrite existing files or only add changed data

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A web application with MongoDB and Bottle

14.03.2013

Home » Archive » 2013 » Issue 13: IPv6... »

wrote this article I have started running test applications as Platform-as-a-Service apps in OpenShift [3]. OpenShift now also has a cartridge that lets you install MongoDB as an add-on. If you

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Port Knocking

07.10.2014

Home » Archive » 2014 » Issue 23: 10 Ti... »

seq_timeout = 10 08 tcpflags = syn 09 command = /usr/sbin/iptables -A INPUT -s \ %IP% -p tcp --dport 22 -j ACCEPT 10 11 [closeSSH] 12 sequence = 9000

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The practical benefits of network namespaces

15.08.2016

Home » Archive » 2016 » Issue 34: Softw... »

via 192.168.1.1 dev eth1 13 $ ip netns exec ns1 ping -c2 8.8.8.8 14 PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data. 15 64 bytes from 8.8.8.8: icmp_seq=1 ttl=51 time=22.1 ms 16 64 bytes from 8.8.8.8: icmp

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Asynchronous PostgreSQL

12.09.2013

Home » Archive » 2013 » Issue 16: Docker »

:00:03.000207 In my httpd.conf file, I set a timeout of five seconds. If the SQL query runs for 4.9 seconds, the server should still provide a reasonable answer, but not after 5.1 seconds (Listing 3). Listing 3

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Gathering Data on Environment Modules

10.09.2012

Home » HPC » Articles »

tell logger which log to use: [laytonjb@test1 ~]$ logger -p cron.notice "This is a cron test" ... [root@test1 ~]# tail -n 2 /var/log/cron Aug 22 17:10:01 test1 CROND[7438]: (root) CMD (LANG=C LC_ALL=C

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