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30.11.2025

Home » Archive » 2011 » Issue 3: Are yo... »

node fails. In cluster versions 1.0 and 2.0, rgmanager was the only master of the Red Hat Cluster, but as of cluster version 3.0, the pacemaker tool is now included with RHEL 6 and Fedora 12 or newer

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Build a honeypot with real-world alerts

01.08.2019

Home » Archive » 2019 » Issue 52: Stop... »

NEW -m tcp --dport 22 -j ACCEPT 10 -A INPUT -p udp --dport 5353 -j DROP 11 -A INPUT -s -p tcp -m state --state NEW -m tcp --dport 443 -j ACCEPT 12 -A INPUT -m limit --limit 30/min -j

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Netcat – The Admin’s Best Friend

20.08.2012

Home » Articles »

since its inception. These days, it handles IPv6 as well as IPv4 beautifully. Its astounding versatility means that integrating it with scripts is a veritable piece of cake. I have heard it said in fact

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A Hands-on Look at Kubernetes with OpenAI

09.10.2017

Home » Archive » 2017 » Issue 41: Kuber... »

.9 Ready 3h v1.6.2 Listing 2 Kubernetes Node Data Structure in YAML $ kubectl get node 10.126.22.9 -o yaml apiVersion: v1 kind: Node metadata: creation

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Roll out hybrid clouds with Ansible automation

14.03.2018

Home » Archive » 2018 » Issue 44: Cloud... »

port 22/TCP). The same applies to the external gateway computer. Here, the VPN input can then be limited to the local VPN gateways' static IPs – if available. This does not offer very strong protection

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Microsoft Exchange replacement

20.06.2022

Home » Archive » 2022 » Issue 69: Terra... »

is available on GitHub [6] or as a packaged distribution from grommunio's customer repository service [7] or a community repository service [8]. Internally, grommunio uses the Open Build Service [9]. Initially

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Tuning I/O Patterns in Fortran 90

04.12.2013

Home » HPC » Articles »

3 type rec 4 integer :: x, y, z 5 real :: value 6 end type rec 7 8 integer :: counter 9 integer :: counter_limit 10 integer :: ierr 11 12 type (rec) :: my

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Moving your data – It's not always pretty

18.07.2013

Home » Archive » 2013 » Issue 15: What’... »

of many cores and many nodes, so why not use these cores to copy data? There is a project to do just this: DCP [5] is a simple code that uses MPI [6] and a library called libcircle [7] to copy a file

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Setting up MariaDB replication with the help of XtraBackup

05.12.2016

Home » Archive » 2016 » Issue 36: Autom... »

, but Debian and Ubuntu installations define max_binlog_size as 100MB. XtraBackup also wants to create a separate file for every InnoDB table, which is enabled by the innodb_file_per_table variable (Listing 3

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Sort out your SSH configs

07.10.2014

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

and the other on all IPv6 IP addresses. Listing 1 Checking Open Ports chris@DebianBox:~# lsof -i :22 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sshd 3328 root 3r IPv4 33323 0t0 TCP *:ssh

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