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Linux

Miscellaneous tips and articles for mortal Linux users and system administrators.

Thoughts 

Limiting your childrens’ internet access effectively using OpenDNS

There comes a time in a nerdy parent’s life when you happen to have kids that are old enough to

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Linux tips 

Updating the BIOS on Lenovo laptops from Linux using a USB flash stick

Aren’t hardware manufacturers funny? They either require an old-fashioned operating system (Windows) or museum hardware (floppy drives) to update a

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ISPmail Wheezy tutorial 

Tracking last logins with Dovecot

There is a newer issue of thie ISPmail guide available if you are using Debian Jessie! Per request I have

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Linux tips 

Docking and undocking Linux laptops with nVidia GPUs using disper

Do you have trouble switching the display when docking and undocking your Linux laptop? In this article I will show

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Linux tips 

Backups with rsnaphot to external USB drives

How long has it been since you last backed up your Linux system? Let me guess – you tried various

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Zabbix 

Zabbix: How escalations work

Zabbix is a very complex software that takes weeks to fully understand. One of the most interesting, most complex and

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Zabbix 

Tired of Nagios and Cacti? Try Zabbix.

One of my professional duties in my past ten years was monitoring systems. Even my diploma thesis was dedicated to

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Linux tips 

Renaming multiple files

If you need to rename a larger number of files following a certain pattern then you will long for an

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Linux tips 

Pipes and redirection

Many system administrators seem to have problems with the concepts of pipes and redirection in a shell. A coworker recently

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Programming 

Why you should not use Python’s easy_install carelessly on Debian

(Hint: This article talks about the Pylons web framework which is essentially dead. But the warning about easy_install and pip is

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Readers’ comments

  • fred 2021-02-25 at 17:51 on Creating a TLS encryption key and certificateHi I am discovering this site for security https://securityheaders.com. I have added things to the .conf file for better results
  • John 2021-02-23 at 13:43 on ISPmail tutorialsA couple of typos on the page: Your mail users can either install a comfortable IMAP client like Thunderbird or
  • Tim Small 2021-02-19 at 15:11 on Monitoring and backuprestic does not (yet) feature compression (restic bug #21 tracks progress on this feature). Yet another backup software package which
  • André 2021-02-18 at 14:35 on Webmail using RoundcubeHallo, ich hab nach der Anleitung alles perfekt hinbekommen aber hätte gerne roundcube in der Version 1.4.11. wie führe ich
  • Bryce J 2021-02-18 at 01:25 on Success storiesHi Christoph I just wanted to say that I have never before come across such a comprehensive and thorough tutorial.
  • yoann 2021-02-16 at 18:44 on Setting up DovecotHello, i have an error when im trying to send an email : Feb 16 19:41:27 mail postfix/smtps/smtpd[10263]: warning: SASL
  • Tim Small 2021-02-15 at 17:13 on Creating a TLS encryption key and certificateMight be worth signposting the "Mozilla SSL Configuration Generator" as a good source for SSL configuration snippets? It supports all
  • Max 2021-02-14 at 20:25 on Filtering out spam with rspamdWenn E-Mails im Junk-Ordner liegen und diese gelöscht werden (direkt im Junk-Ordner) dann wird das Ham Script ausgeführt. Gibt es
  • Hector 2021-02-14 at 14:41 on Firewalling and brute force mitigationFor that last post this is what I meant to add. [DEFAULT] banaction = nftables-multiport chain = input [apache-auth] enabled
  • Hector 2021-02-14 at 14:40 on Firewalling and brute force mitigationShould be in "/etc/fail2ban/jail.d/jail.local" instead of "/etc/fail2ban/jail.local"? Reason I ask is because on top of that "/etc/fail2ban/jail.local" file there is
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