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Dirk Mittler's Blog

A Journal of my Ongoing Experiences.

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Tags

  • Android
  • Apache
  • Computer Algebra
  • Custom-Compile
  • DCT
  • Debian
  • Debian 9
  • Debian Stretch
  • Desktop Compositing
  • Downtime
  • DSL Problem
  • Future Downtime
  • GPU
  • HBS-750
  • IPv6
  • Kanotix
  • KDE
  • Kernel Update
  • Linux
  • Linux Laptop
  • memcached
  • MOSFET
  • MP3 Compression
  • MySQL
  • NG-SPICE
  • OpenCL
  • OpenGL
  • Pixel C
  • Plasma 5
  • Power Failure
  • PulseAudio
  • Quantum Mechanics
  • Reboot
  • RTL8723BE
  • Samba
  • Sound Compression
  • Source Code
  • Successful Update
  • System Update
  • Unattended Upgrades
  • Update
  • WiFi Disconnects
  • WiFi Problem
  • WordPress
  • X-Server

Most Directly-Viewed, Individual Posts

  • One reason Why, It is Difficult For Me to Guess, at the Variable-Length Encoding of numbers, Chosen By Other People (8,326)
  • My Experiences with the Bell Home Hub 3000 (6,056)
  • Testing the Focusrite Scarlett 2i2 external sound device, with my Samsung S6 Smart-Phone (5,960)
  • I can offer a sound-compression scheme that I know will not work, as a point of reference. (5,559)
  • How DynDNS Works (2,960)
  • I now have Linux installed on my Samsung Galaxy Tab S. (2,876)
  • Getting Pulseaudio to schedule real-time threads under Debian / Stretch and beyond. (2,720)
(Hit Counters Installed March 5, 2016)

Recent Posts:

  • Creating a C++ Hash-Table quickly, that has a QString as its Key-Type.
  • How to know, whether our Qt 5 C++ projects make use of dynamically-loaded plug-ins.
  • Managing Usershares properly, under SAMBA (meaning, under the SMB emulation given by Linux).
  • How an old problem with multiple (Debian / Linux) sessions seems to require an old fix.
  • Why C++ compilers use name-mangling.
  • An Ode to Cinepaint
  • What the name of the memory allocator is, under C++.

Recent Comments

  • Dirk Mittler on File-Sharing under Linux, using Usershares – the Modernistic Way.
  • Ted N on File-Sharing under Linux, using Usershares – the Modernistic Way.
  • Dirk Mittler on File-Sharing under Linux, using Usershares – the Modernistic Way.
  • Ted Newell on File-Sharing under Linux, using Usershares – the Modernistic Way.

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  • A Repository Of WebGL Creations
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  • About The Translations – And The Missing Pieces Of Text
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  • Some Nastiness that had taken place, with my Blocks Of Code
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Tag: User Processes

Successful X-server Update Today

Today the Debian / Jessie package maintainers pushed through an update to my X-server, bringing that up to version ‘2:1.16.4-1+deb8u1‘. In a case like this, it’s better to restart the session, just to load the new X-server version, but also, to make sure that any problems in running the X-server do not take us by surprise, during some later reboot.

As it happens, the computer this took place on, which I name ‘Phoenix‘, is also my Web-server. And so it’s desirable to perform the restart of the session, without doing a full reboot of the computer. Under Linux, with the ‘KDE’ desktop manager, we can do this by just Logging Out, and then Logging back In. Doing so also causes an X-server restart.

Not doing a full reboot of my computer, also meant that my Apache Web-server continued running, without causing any disruption to the visibility of my Web-site, or of this blog.

Yet, there was a glitch. As I told my user-session to log out, the display hanged, with the mouse-pointer still visible, but with the rest of my display black, and with no further activity on the hard-drive. In this situation I can help myself, by using the KDE, <Ctrl>+<Alt>+Backspace key-combination, to force an X-server restart. Doing so successfully ended my user-session. Then, the X-server restarted, and I got to log back in.

What this means is that the preparatory work I did according to this earlier posting, has paid off.

I count this as a successful update.

Dirk

 

Posted on July 9, 2017July 9, 2017Tags Apache, KDE, Log-In, Log-Out, System Processes, System Services, Update, User Processes, User Space, Web-server, X-ServerLeave a comment on Successful X-server Update Today

KDE Update This Morning

This morning, effectively as I slept, my Linux computer named ‘Phoenix’ downloaded and installed a set of updates, to KDE, which is the framework installed on this computer, for managing the display of my Desktop / GUI, as well as for PIM. Because this update installed itself unattended, it meant that user-processes were still running, which did not have the latest version of the software loaded into RAM.

This can happen easily on Linux computer-systems, which generally just keep working that way – in the short term. But in the long term, eventually something is going to want to wake up a KDE-program which is not already running, and which will want to use the latest images, at which point some sort of incompatibility could set in.

Fortunately though, KDE will only affect user-processes, as I just wrote, but will not affect system-processes, such as my Apache Web-server, or the instance of the MySQL-server, which is running as a system- rather than as a user-process. And so what I can do in this case, is just log out the user, and log him back in. Doing so also reloads the X-server, which does a shutdown as well, and restarts the graphics-driver.

Both the update to KDE, as well as my log-out, log-in maneuver, worked well, without any hint at first glance, of anything going wrong. As a  result, the availability of the site and my blog were unaffected. Also, the ‘memcached‘ process is a system-process that did not require any restart, so that the responsiveness of my blog, to the most-frequent requests for postings from readers, should still be as quick as it was only 30 minutes ago.

Dirk

 

Posted on May 12, 2017Tags Apache, KDE Update, KDE-PIM, Log-In, Log-Out, memcached, MySQL, Routine Update, Successful Update, System Processes, User Processes, Web-serverLeave a comment on KDE Update This Morning
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