The Wiert Corner – irregular stream of stuff

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

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TUMBLEWEED Ordering cycle at boot with nss-lookup: named fails to start initially; workaround: manually `rcnamed start`

Posted by jpluimers on 2021/01/15

I have seen this on one Raspberry Pi 3 system: named failing to start during a normal reboot.

The solution is to manually rcnamed start as root after boot.

From [Wayback] TUMBLEWEED Ordering cycle at boot with nss-lookup, the rcnamed status is the same as on my system, but no solution in that thread:

# systemctl status named
● named.service - Berkeley Internet Name Domain (DNS)
     Loaded: loaded (/usr/lib/systemd/system/named.service; enabled; vendor preset: disabled)
     Active: inactive (dead) Jul 02 08:13:40 hpprol2 systemd[1]: nss-lookup.target: Found ordering cycle on named.service/start
Jul 02 08:13:40 hpprol2 systemd[1]: nss-lookup.target: Found dependency on time-sync.target/start
Jul 02 08:13:40 hpprol2 systemd[1]: nss-lookup.target: Found dependency on ntpd.service/start
Jul 02 08:13:40 hpprol2 systemd[1]: nss-lookup.target: Found dependency on nss-lookup.target/start
Jul 02 08:13:40 hpprol2 systemd[1]: nss-lookup.target: Job named.service/start deleted to break ordering cycle starting with nss-lookup.target/start

Apparently, sometimes there is a service startup dependency loop, and named becomes the victim of it, effectively rendering DNS inoperable.

My system was running this version of Tumbleweed:

statler:~ # cat /etc/SUSE-brand /etc/os-release 
openSUSE
VERSION = tumbleweed
NAME="openSUSE Tumbleweed"
# VERSION="20200825"
ID="opensuse-tumbleweed"
ID_LIKE="opensuse suse"
VERSION_ID="20200825"
PRETTY_NAME="openSUSE Tumbleweed"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:opensuse:tumbleweed:20200825"
BUG_REPORT_URL="https://bugs.opensuse.org"
HOME_URL="https://www.opensuse.org/"
LOGO="distributor-logo"

On an identical system, the boot just worked fine, so it might be timing related.

waldorf:~ # cat /etc/SUSE-brand /etc/os-release 
openSUSE
VERSION = tumbleweed
NAME="openSUSE Tumbleweed"
# VERSION="20200825"
ID="opensuse-tumbleweed"
ID_LIKE="opensuse suse"
VERSION_ID="20200825"
PRETTY_NAME="openSUSE Tumbleweed"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:opensuse:tumbleweed:20200825"
BUG_REPORT_URL="https://bugs.opensuse.org"
HOME_URL="https://www.opensuse.org/"
LOGO="distributor-logo"

It has been fixed late January 2021 as per [Wayback] Bug 1177491 – systemd ordering cycle with nss-lookup.target:

Josef Möllers 2021-01-27 15:50:15 UTC
Fixed by removing "Before=nss-lookup.target" from systemd's service file.

It means editing /etc/systemd/system/multi-user.target.wants/named.service from

[Unit]
Description=Berkeley Internet Name Domain (DNS)
After=network.target
After=time-sync.target
Before=nss-lookup.target
Wants=nss-lookup.target
Wants=time-sync.target

[Service]
Type=forking
ExecStart=/usr/sbin/named.init start
ExecReload=/usr/sbin/named.init reload
ExecStop=/usr/sbin/named.init stop

[Install]
WantedBy=multi-user.target

into

[Unit]
Description=Berkeley Internet Name Domain (DNS)
After=network.target
After=time-sync.target
Wants=nss-lookup.target
Wants=time-sync.target

[Service]
Type=forking
ExecStart=/usr/sbin/named.init start
ExecReload=/usr/sbin/named.init reload
ExecStop=/usr/sbin/named.init stop

[Install]
WantedBy=multi-user.target

Note that it is an alias, so it won’t show up in a versioned /etc directory (for instance using etckeeper):

# ls -Alh /etc/systemd/system/multi-user.target.wants/named.service 
lrwxrwxrwx 1 root root 37 Sep  5  2020 /etc/systemd/system/multi-user.target.wants/named.service -> /usr/lib/systemd/system/named.service

–jeroen

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

The multi-carrier platform for future-proof delivery

Posted by jpluimers on 2021/01/15

In case I ever need to setup shipment tracking: [WayBack] The multi-carrier platform for future-proof delivery.

We believe delivery is the biggest game changer in e-commerce. So you need software that makes shipping easy and your customer happy. We do just that.

–jeroen

 

Posted in Cloud, Infrastructure, LifeHacker, Power User | Leave a Comment »

Having the Tom Bihn Brain Bag as day-to-day backpack, I wonder about the PeakDesign Travel Backpack

Posted by jpluimers on 2021/01/15

Having the Tom Bihn Brain Bag as day-to-day backpack, I wonder about the PeakDesign Travel Backpack.

The features I like most about the [WayBack] Tom Bihn Brain Bag are:

  • that it has 2 big main compartments,
  • the rail system allowing easy attached removal of one or two laptop caches [WayBack],
  • the freudian slip insert [WayBack],
  • the snake charmer accessory [WayBack],
  • the materials last forever
    (my first lasted 20+ years, so I gave it to mentally retarded brother. To bad he disposed it, not realising how durable it was “it was too big for my work-stuffand too small for my diving flippers, so I threw it away”)

Two more things I like, but are not available any more (new products are being designed for them):

I wonder about the material differences between the two too backpacks.

Here are some links if you want to compare them yourself:

Via: [WayBack] After 2 weeks of researching I finally bought what I believe to be the best carry on backpack in the world: The #PeakDesign Travel Backpack. Seriously i… – Jason Mayes – Google+

On fabrics:

 

–jeroen

Read the rest of this entry »

Posted in About, LifeHacker, Personal, Power User, Travel | Leave a Comment »

Forced routing of selective emails to ISP SMTP via Mikrotik Routing | Syed Jahanzaib Personal Blog to Share Knowledge !

Posted by jpluimers on 2021/01/14

For my link archive: [WayBack] Forced routing of selective emails to ISP SMTP via Mikrotik Routing | Syed Jahanzaib Personal Blog to Share Knowledge !

–jeroen

Posted in Development, MikroTik, Power User, RouterOS, routers, Scripting, Software Development | Leave a Comment »

GitHub – pierrejean-coudert/delphi-libraries-list: List of Delphi Libraries and Frameworks

Posted by jpluimers on 2021/01/14

For my link archive: [WayBack] GitHub – pierrejean-coudert/delphi-libraries-list: List of Delphi Libraries and Frameworks

–jeroen

Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development | Leave a Comment »

The difference between thread-safety and re-entrancy – The Old New Thing

Posted by jpluimers on 2021/01/13

Just in case I need a nice example about the difference: [WayBack] The difference between thread-safety and re-entrancy – The Old New Thing.

It has both that and the definition:

An operation is “thread-safe” if it can be performed from multiple threads safely, even if the calls happen simultaneously on multiple threads.

An operation is re-entrant if it can be performed while the operation is already in progress (perhaps in another context). This is a stronger concept than thread-safety, because the second attempt to perform the operation can even come from within the same thread.

–jeroen

Posted in Conference Topics, Conferences, Development, Event, Software Development | Leave a Comment »

Programming Wisdom auf Twitter: ““Good code is its own best documentation. As you’re about to add a comment, ask yourself, “How can I improve the code so that this comment isn’t needed?” Improve the code and then document it to make it even clearer.” – Steve McConnell”

Posted by jpluimers on 2021/01/13

[WayBack] Programming Wisdom auf Twitter: ““Good code is its own best documentation. As you’re about to add a comment, ask yourself, “How can I improve the code so that this comment isn’t needed?” Improve the code and then document it to make it even clearer.” – Steve McConnell”

Code the why in a clean and understandable way.

Then document the how, and clear up any implementation/usage details that are hard to understand.

–jeroen

Posted in Development, Software Development | Leave a Comment »

Delphi TVirtualMethodInterceptor like magic: some links of useful stuff made with it

Posted by jpluimers on 2021/01/13

I think TVirtualMethodInterceptor is a really nice things added to Delphi XE: it allows you to overwrite virtual methods of a class.

Since the documentation from that era cannot be saved in the WayBack machine, here is some more recent documentation:

Over the years, the underlying RTTI has been improved, so it can now do more than in the past, but is still cumbersome to use, see for instance [WayBack] tutorial script delphi Changing component class at run-time on demand – CODE Q&A Solved and [WayBack] TVirtualMethodInterceptor (Delphi) – RAD Studio Code Examples and [WayBack] Entropy Overload: Virtual method interception and [WayBack] Playing around with TVirtualMethodInterceptor | Delphi Haven with TVirtualMethodLogger.

Luckily there are more powerful alternatives based on the same ideas and/or underlying implementationIn fact, it can do so much for instance on the Spring4D and DSharp frameworks.

A demo is at [WayBack] Delphi sorcery: Pimp your unit tests using mock objects or [WayBack] Delphi sorcery: AOP and duck typing in Delphi.

The demo of the mocking framework was at code.google.com/archive/p/delphisorcery, but now is part of bitbucket.org/sglienke/dsharp at bitbucket.org/sglienke/dsharp/src/master/Source/Testing.

Some relevant directories:

Basically it is a playground for the more often updated and stable Spring4D where these directories and files are relevant:

–jeroen

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

Not all language packs are created equal… 

Posted by jpluimers on 2021/01/12

[WayBack] Why don’t I get properly translated program output after installing the corresponding language pack? – The Old New Thing.

It means you cannot fully cover all translations when writing software.

More on translating your software at [WayBack] Where can I get the glossary of Microsoft’s standard translations for computer terms? – The Old New Thing « The Wiert Corner – irregular stream of stuff.

–jeroen

Posted in Development, Software Development, The Old New Thing, Windows Development | Leave a Comment »

TODO: if weerslag hasn’t supported https yet, dig deeper into ProxyPass / ProxyPassReverse

Posted by jpluimers on 2021/01/12

I’ve this page for my brother: https://martijn.pluimers.com/agenda-month-weather.html.

It serves his agenda plus a few weather widgets.

The weerslag widget fails to load as it’s in an iframe pointing to http but the page is https. That’s not allowed as shown in this nice table at [WayBack] ssl – Insecure content in iframe on secure page – Stack Overflow by amol-ghotankar and richard:

page  - iframe - status
----- - -----  - -----------
http  - http   - allowed
http  - https  - allowed
https - http   - not allowed
https - https  - allowed

So I put it behind a simple Apache reverse proxy: https://www.pluimers.com/maps.weerslag.nl/GratisRadar/1201/864/verwacht?zoom=10:


<Location /maps.weerslag.nl>
ProxyPass http://maps.weerslag.nl
ProxyPassReverse http://maps.weerslag.nl
Require all granted
</Location>

view raw

maps.weerslag.nl.conf

hosted with ❤ by GitHub

If they still haven’t fixed their https access, I need to dig deeper into this.

When writing this [Arhive.is] https://maps.weerslag.nl/GratisRadar/1201/864/verwacht?zoom=10 gave a 404 and http://maps.weerslag.nl/GratisRadar/1201/864/verwacht?zoom=10 misbehaved behind the proxy:

–jeroen

Posted in *nix, Apache2, Development, Power User, Web Development | Leave a Comment »

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