The Wiert Corner – irregular stream of stuff

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

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Tumbleweed on Raspberry Pi 3 – Bug 1084419 – Glibc update to 2.27 causes segfault during name resolution

Posted by jpluimers on 2018/03/15

Need to watch these:

A few notes:

  • It is inside the glibc name resolution
  • IPv6 is OK, IPv4 fails.
  • ping/nslookup (which do not depend on glibc) are OK
  • there is an intermediate fix requiring direct osc downloads

A simple test case

Failing situation

$ curl --silent --show-error http://example.org > /dev/null
Segmentation fault (core dumped)

Succeeding situation

$ curl --silent --show-error http://example.org > /dev/null

Non related, but in hindsight my own stupid fault during a similar update: a post mortem

Most important bits of my external infrastructure - page 1

Most important bits of my external infrastructure – page 1

I thought I had forgot about the SuSEfirewall2 changes (On my research list: migrate from OpenSuSE SuSEfirewall2 to firewalld) so assumed that was the reason I broke one of my secondaries (which runs on a Raspberry Pi 2):

Mistakes like these are the reason to have secondaries in the first place https://infrastatus.wiert.me and do port-mortems.

Which is kind of odd, as the SuSEfirewall2 didn’t throw any warnings like at this similar one:

This one still works because it is on the firewall in front of the Raspberry Pi 2:

(Screenshots of the above URLs are below).

In fact it was another mistake: I had forgotten to make the DHCP lease static, which resulted in a wrong IP address to be assigned upon reboot, instantly making the firewall rules invalid:

I could have fixed this remotely when I had thought about this.

–jeroen

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Posted in *nix, Development, Hardware Development, Linux, openSuSE, Power User, Raspberry Pi, SuSE Linux, Tumbleweed | 3 Comments »

EmbarcaderoMonitoring – monitoring the Embarcadero internet related services

Posted by jpluimers on 2018/03/15

Over time, there are lots of complaints about Embarcadero related internet services (like forums, QC, Appanalytics, docwiki, blogs, web site, maintenance, …) so to track uptime, I’ve created a set of EmbarcaderoMonitoring pages:

This is preliminary work based on my own lists of Embarcadero endpoints combined with some research like [WayBack] dnsdumpster embarcadero.com.png and [WayBack] IdentIPSpy

Underneath, they run on the uptimerobot.com infrastructure which has a limit of 50 free monitors.

It means I have to:

  • trim this down for relevancy
  • better document the endpoint
  • find correct endpoint targets for the black (disabled) and red (down) entries as a few of them might need tweaking
  • maybe split off an insecure and secure version (now most subdomains have both http and https monitored)

Any ideas on improving this are welcome: please post a comment here on on the resulting G+ thread.

Note it likely won’t show cases like when the website was hacked or TLS certificate issues like in SSLLabs security reports for some embarcadero subdomains. I need to think about a means for those, as it will certainly help monitoring my own infrastructure in a similar way.

–jeroen

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Posted in *nix, Cloud, Development, DevOps, Infrastructure, Monitoring, Power User, Software Development, Uptimerobot | Leave a Comment »

Stop using anemic daily stand-up questions | Software on a String

Posted by jpluimers on 2018/03/15

TL;DR:

Reminding everybody of the actual purpose of the daily stand-up and of the goal(s) you have for the sprint may be all that’s needed to give the shortened versions some much needed context and focus.

Always read the Scrum guide, as it states the purpose of this meeting:

The Daily Scrum is a 15-minute time-boxed event for the Development Team to synchronize activities and create a plan for the next 24 hours.

Source: [WayBack] Stop using anemic daily stand-up questions | Software on a String

via: [WayBack] Marjan Venema – Google+

–jeroen

Posted in Agile, Development, Scrum, Software Development | Leave a Comment »

Delphi: do not mix interfaces and classes part X

Posted by jpluimers on 2018/03/15

A very interesting discussion on what the mixing of interfaces and classes can get you into: [WayBack] I’ve got an interface with generics which accepts classes:IMyGeneric = interface…..end;What I want to do is to allow this interface to… – John Kouraklis – Google+

TL;DR: do not mix interfaces and classes.

As often, Asbjørn Heid chimes in showing some insight on clever mixing of the two with sample code accepting an unconstrained type. Don’t do that unless you really know what’s going on behind the scenes.

–jeroen

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Posted in Delphi, Development, Software Development | 4 Comments »

GitHub – keith-turner/ecoji: Encodes (and decodes) data as emojis

Posted by jpluimers on 2018/03/14

[WayBack] GitHub – keith-turner/ecoji: Encodes (and decodes) data as emojis:

Ecoji 🏣🔉🦐🔼

Ecoji encodes data as 1024 emojis, its base1024 with an emoji character set. As a bonus, includes code to decode emojis to original data.

Sick. Works splendid when all your systems are fully nice to Unicode.

None are. So there’s a German word for it:

Nein

Via:

 

–jeroen

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Posted in Development, Encoding, Fun, Go (golang), Software Development, Unicode | Leave a Comment »

Medisch dossier | Autoriteit Persoonsgegevens: wie heeft recht op inzage/wijziging/verwijdering van welke gegevens en waarom wel/niet?

Posted by jpluimers on 2018/03/14

[Archive.is] Medisch dossier | Autoriteit Persoonsgegevens, meer details in [Archive.is] praktijkgids_patientgegevens_in_de_cloud_def.pdf.

Doordat een combinatie van regelgeving van toepassing kan zijn – waaronder “Wet op de geneeskundige behandelingsovereenkomst” (WGBO), “Wet bescherming persoonsgegevens” (Wbp) of/en “Wet bijzondere opnemingen in psychiatrische ziekenhuizen” (Wet Bopz) – is het een lastig gebied, niet alleen voor jezelf, maar ook voor ouders/verzorgers/vertegenwoordigers.

Bovenstaande link heeft meer informatie over wie er recht heeft op inzage/wijziging/verwijdering van welke gegevens en waarom wel/niet.

–jeroen

Posted in LifeHacker, Power User | Leave a Comment »

Aerotwist – 🌟 When everything’s important, nothing is! 🌟

Posted by jpluimers on 2018/03/14

Interesting read of about 20 minutes on the time between the request of an URL and the actual visible rendering clues.

Do libraries and frameworks prioritize components on boot? If so, how, and if not what can we do? And, in exploring that question, I discovered that Server-Side Rendering isn’t a silver bullet!

Source: [WayBack] Aerotwist – 🌟 When everything’s important, nothing is! 🌟

The state about a year ago was that progressive rendering had the best results as seen on the right.

I wonder if that has changed by now.

–jeroen

via: [WayBack] 🌟 When everything’s important, nothing is! 🌟  -via FlynxGood read for javascript… – Roderick Gadellaa – Google+

Posted in Development, Software Development, Web Development | Leave a Comment »

kdzwinel/betwixt: Web Debugging Proxy based on Chrome DevTools Network panel.

Posted by jpluimers on 2018/03/14

This is a great complimentary tool to Http Fiddler on Windows and Mac OS X, and the only tool on Linux (that is not covered by Http Fiddler): kdzwinel/betwixt: Web Debugging Proxy based on Chrome DevTools Network panel.

–jeroen

Posted in Development, Fiddler, Software Development, Web Development | Leave a Comment »

Windows 10: Update error 0x8024a112 | Born’s Tech and Windows World

Posted by jpluimers on 2018/03/13

Had this happen on a Dutch Windows 10 system today, a retry did not work, but a manual reboot solved it [WayBack] Windows 10: Update error 0x8024a112 | Born’s Tech and Windows World.

–jeroen

Posted in Power User, Windows, Windows 10 | Leave a Comment »

Reasons you might to think about when not to do OO

Posted by jpluimers on 2018/03/13

Some interesting videos:

Of course the titles are exaggerated

–jeroen

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Posted in Design Patterns, Development, Software Development | 1 Comment »

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