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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Linux’ Category

How to Configure and Manage Network Connections Using ‘nmcli’ Tool

Posted by jpluimers on 2017/09/22

Via “In the form over function era: Using Network Manager from the command line” [WayBack]:

As a Linux administrator you’ve got various tools to use in order to configure network connections, such as: nmtui, NetworkManager GUI and nmcli in Linux

Source: How to Configure and Manage Network Connections Using ‘nmcli’ Tool [WayBack]


Posted in *nix, *nix-tools, Linux, Power User | Leave a Comment »

Re: [opensuse-factory] dup –no-allow-vendor-change is now default

Posted by jpluimers on 2017/09/15

I totally missed this announcement 2 months ago:

after this update, zypper dup will default to –no-allow-vendor-change, whichhas been the recommended way for Tumbleweed for a long time now.

Source: Re: [opensuse-factory] dup –no-allow-vendor-change is now default

So Dominique was glad to “rub the salt” a bit (:

[WayBack/Archive.isDominique / DimStar‏ @DimStar Replying to @sysrich @jpluimers: for the record: –no-allow-vendor-change has become the default in Tumbleweed, see also

It was documented at least on these places:


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Posted in *nix, Linux, openSuSE, Power User, SuSE Linux, Tumbleweed | Leave a Comment »

zypper errors on

Posted by jpluimers on 2017/09/13

If you see error message like below when performing zypper refresh or zypper dist-upgrade, then please inform the opensuse team (for instance Twitter or the #openSUSE-factory IRC channel) as this is part of the aftermath of the trouble that started last week.

Permission to access '' denied.

What happened to me with Raspberry Pi 3 and Tumbleweed is below and fixed because after I got in touch: the data restore had worked out OK, but the permissions didn’t.

I got there as the search for “Permission to access ‘” got me to [WayBack] TUMBLEWEED Zypper Permission to access:

Unfortunately there was a catastrophic issue last week with the openSUSE download system (read: stuff is still broken and not all mirrors are fully functional).


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Posted in *nix, Linux, openSuSE, Power User, SuSE Linux, Tumbleweed | Leave a Comment »

Welcome to – tips around open source and Linux stuff

Posted by jpluimers on 2017/09/12

At the time of discovering Welcome to via More ISP Mail saveback – Joe C. Hecht – Google+:

ISPmail tutorials

The famous ISP-style mail server tutorials live here. Learn how to set up your own fully-functional mail server using Postfix, Dovecot IMAP/POP3 and MySQL backend on a Debian server just like your favorite mail or website hosting provider.

I have been maintaining the ISPmail tutorial since Debian Woody. However those older Debian versions are no longer supported. If you still like to read the old versions I have provided PDF versions of the tutorials for Squeeze, Lenny, Etch, Sarge andWoody.

Thoughts blog

My projects

I am a system administrator and programmer. In my nerdy spare time I work on web applications, Python and Ruby programs, write articles or explore new software technologies. On you can find news, solutions and hints on my findings and get help. Of course your feedback is welcome.
These are some projects I am currently working on:

IRC – Internet relay chat

  • IRC is a great medium for getting instant help (at least on the freenode IRC network). I have collected some tips about Getting help on IRC to help you get help instead of getting barbecued.
  • knoba’s factoids
    I run a bot called knoba (short for knowledge base) on the freenode IRC network. Two channels I visit frequently are #postfix and #squid. So I have fed the bot with lots of factoids that you can query using !foobar in the channel. These are the factoids understood in #squid and #postfix. Please don’t play with the bot publicly. Send it a “/msg knoba help" and learn how it works.

Linux tips

Regarding the Squid web proxy

Padrino web framework

Zabbix monitoring

Zabbix is a mighty open-source monitoring software. If you need a serious system for your organisation and manage to condone its creepy web interface it is hands down the the most superior software I have ever seen. And I have been dealing with monitoring software since Nagios was called Netsaint.

These articles should help you in your daily work maintaining a monitoring system:



Posted in *nix, BIOS, Boot, Development, Linux, Open Source, Power User, Software Development | Leave a Comment »

systemd/udev: PredictableNetworkInterfaceNames

Posted by jpluimers on 2017/08/28

This is so cool, but will take some time for lot’s of tooling to become compatible:

Starting with v197 systemd/udev will automatically assign predictable, stable network interface names for all local Ethernet, WLAN and WWAN interfaces. This is a departure from the traditional interface naming scheme (“eth0”, “eth1”, “wlan0”, …), but should fix real problems.


Posted in *nix, *nix-tools, Linux, Power User, systemd | Leave a Comment »

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