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literacy and subtleties for open-source bigots and other weirdos

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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 

Mounting flash sticks or memory cards on Debian

Usually modern desktop Linux distributions make it easy to automatically mount external storage media like USB flash sticks. But if all

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Linux tips 

Bareos/Bacula Cheat Sheet

Bacula is a nifty backup software that is network-capable and stores data in the database for faster retrieval in case

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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

  • Anon 2019-02-12 at 17:22 on ISPmail guide for Debian StretchThe GPL program Pandoc will convert fairly simple html into PDF, or markdown, or quite a few other things.
  • Anon 2019-02-12 at 17:13 on ISPmail guide for Debian StretchYou may be able to convert the html directly to PDF using the GPL program Pandoc (https://pandoc.org/).
  • Ralf Luhrmann 2019-02-12 at 11:17 on What’s new in the Stretch guide?Hi Christoph, Thanks for this new guide. Followed your previous guide but used it with my openSUSE OS. I'd like
  • Christoph Haas 2019-02-11 at 10:38 on Managing users, aliases and domainsPostfixadmin uses a pretty different schema. I did not deliberately choose something different. It's just that I tried to keep
  • Christoph Haas 2019-02-11 at 10:36 on Install the software packagesI would not expect any problems. But there is no PHP7.2 in Debian Stretch/Stable. PHP is a security risk anyway…
  • Enrico 2019-02-11 at 10:25 on Install the software packagesHi Christoph, just a quick question. It's safe to upgrade from PHP7.0 to PHP7.2 or there are some issues? Thank
  • Marcelo Alberto Gomez 2019-02-07 at 15:39 on Filtering out spam with rspamdHow do I ensure that a user or anybody isn't using the server to send spam or sending bulk emails,
  • Joost 2019-02-07 at 14:50 on Making Postfix send emails to DovecotI got this error message also and than found out that there were 2 userdb parts enabled. Open the file
  • Tony 2019-02-06 at 05:59 on Managing users, aliases and domains@Christoph When you compare your Database Schema and Postfixadmin's, are there any advantages disadvantages one over another? Is one better
  • fredo 2019-02-05 at 10:16 on Testing IMAP and setting up Roundcube webmailreally great tutorial. I only have a problem with logging into mutt, the password seams not to work and i

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