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Linux

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

Programming 

How to create a favicon for your web site

If you like to create a tiny favicon for your web site (the little icon displayed left of the URL

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Linux tips 

Using tcpdump and Wireshark to sniff and analyse your network traffic

Sometimes a network service is just not behaving the way it should. And the log files do not help you

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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

  • Christoph Haas 2021-01-27 at 10:11 on Debian packages are just so oldI admit that "moron" may not sound very scientific and overly simplified. Still even as a developer of a great
  • Wolfram 2021-01-27 at 09:03 on Debian packages are just so oldHi Christoph, calling a software developer a moron and using his software at the same time is a good example
  • Jon 2021-01-26 at 02:36 on Creating a TLS encryption key and certificateI could use some input on upgrading my stretch server to sit behind an HAProxy. I am wondering about certs.
  • wenston 2021-01-22 at 07:50 on QuotasThe part where postfix checks for quota isn't working. If I check dovecots status using systemctl status dovecot it shows
  • Arnaud 2021-01-21 at 17:04 on Webmail using RoundcubeHi, Can anybody help me ? I must confess that I'm a little bit blocked... Best regards, Arnaud
  • Usa 2021-01-21 at 11:25 on How Squid ACLs workHi, Christoph Haas Can we define more than two ACLs in one line http_access rule? For Example : acl ListIP1
  • OnceAceGuy 2021-01-19 at 07:30 on Setting up Dovecot@harshness - It is not in the tutorial, that is why I added the comment :-) I did a fresh
  • harshness 2021-01-19 at 00:58 on Setting up Dovecot>In dovecot-sql-conf.ext there is a default password scheme parameter as follows: >default_pass_scheme = MD5 Where in the Buster tutorial do
  • boris 2021-01-18 at 18:55 on Testing IMAPI just found out another little piece of my puzzle(dness): I believe that mutt doesn't care for the sub-domain, except
  • boris 2021-01-18 at 18:46 on Testing IMAPHi Christoph and thanks a lot for the extensive tutorial! One thing I don't understand: I connect to mutt with
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