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Linux tips

In my day job I am managing Debian and Ubuntu systems. However dealing with the operating system is just one part. Even more important is knowing your tools. And there is a hell of a lot of open source software packages available that attempt to make your life easier. But each of them works differently and even if you mastered one tool it will often not help you work with another. Whenever I find something interesting I am trying to write an article about it. May they help broaden your mind, too.

Linux tips Programming 

Co-maintaining a Debian package with Git and git-buildpackage

Although I’m still not entirely comfortable with Git for revision control I partly use it to maintain my Debian packages.

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Linux tips 

How do I create my own Certificate Authority (CA)

CA is short for Certificate Authority. A CA issues certificates for i.e. email accounts, web sites or Java applets. Actually

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Linux tips 

Christoph’s OpenVPN Mini-FAQ

OpenVPN is an open-source SSL VPN software. It allows you to connect different (private) networks securely over the internet. It’s

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Readers’ comments

  • Tim Makarios 2019-11-26 at 01:08 on ISPmail tutorialsA "knee incident" doesn't sound much like good news, to me, but I guess every cloud has a silver lining,
  • Christoph Haas 2019-11-21 at 14:10 on ISPmail tutorialsHi Vincenzo. Good news… I had a knee incident and am sick at home. That gives me time to get
  • Vincenzo 2019-11-21 at 11:40 on ISPmail tutorialsIs there any update on the Buster guide? As already asked by other people, I'd also like to know what
  • Christoph Haas 2019-11-19 at 11:08 on ISPmail tutorialsSorry about that. I removed my Gitlab instance because my rented server was running out of RAM. Currently I am
  • Bart van Bragt 2019-11-19 at 10:01 on ISPmail tutorialsAnd same here. Have been checking this site for updates quite a few times now :) Alas https://git.workaround.org/ispmail-ansible/ispmail-buster has been
  • Franck 2019-11-18 at 20:22 on Filtering out spam with rspamdIn fact, from version 2 of rspamd, it is imperative to use redis instead of sqlite to avoid problems !
  • Susu 2019-11-18 at 14:30 on Updating the BIOS on Lenovo laptops from Linux using a USB flash stickI have a same issue
  • Christoph Haas 2019-11-18 at 13:18 on Making Postfix get its information from the MySQL databaseWhat do the permissions look like? (ls -ld /etc/postfix/mysql*cf)
  • Adnan 2019-11-16 at 21:36 on Making Postfix get its information from the MySQL databaseWhen trying to mail any on my domains get the error SMTP error from remote mail server after RCPT 451
  • Darrell 2019-11-12 at 19:01 on Filtering out spam with rspamdThanks Louis. Your suggestion solved my issue.

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