When I started to include container migration into Podman using CRIU over a year ago I did not really think about SELinux. I was able to checkpoint a running container and I was also able to restore it later https://podman.io/blogs/2018/10/10/checkpoint-restore.html. I never looked at the process labels of the restored containers. But I really should […]

This month’s come together will be held on 2019-04-03, 8pm not at our regular pub (see our mailing list for details).

This month’s come together will be held on 2019-03-13, 8pm not at our regular pub (see our mailing list for details).

I’ve connected the Arduino pro mini (328/5V) to my pcb. Of course it’s not directly soldered to the PCB but using a connector, so I can replace the parts that get bricked during development. I’ve downloaded the blink example using something like this. Directly after flashing it worked, but once I disconnected the flashing adapter […]

… an ohmic load (Thank you Axel) shows the same behavior (spikes on Vout) as seen in the previous post. Fortunately I’ve spent some space on the pcb for an optional filter that has now become mandatory. The spikes do not change with load or input voltage. I took a closer look and they are […]

This month’s come together will be held on 2019-02-13, 8pm not at our regular pub (see our mailing list for details).

I’ve run the power supply under load. As you can see I’ve not yet removed the screen protector foil from my multimeter connected the cables in the wrong direction so the current is negative load current @ Vout=5V [A] The load was a florist wire that accidentally had the correct length to have a resistance […]

After a (luckily unsuccessful) search for short cuts I have connected the power supply part on the pcb to an external power supply. The following screen shot shows that the power supply becomes operational at around 12V. Channel 1: VoutChannel 2: Vin (manual rise from 0 to 15V ) Unfortunately I do not have a […]

After a long time I’ve reactivated my solder iron. Since I’ve done that without additional flux (apart from the content of the solder) the result looks accordingly. My next step will be testing the circuitry. power supply part of the cancombase Surprisingly for me the soldering of the IC was the easiest. I assume, that […]

After ordering the prototype pcbs in China on Saturay they arrived on the following Wednesday. I even got one more pcb than I’ve ordered. The service is very fast and the price more than acceptable. So based on this single sample I can recommend allpcb.com. Apart from the silkscreen, the pcb looks good. But I’ve […]

This month’s come together will be held on 2019-01-16, 8pm not at our regular pub (see our mailing list for details).

Of course loxone offers the possibility to connect the miniserver to the internet and also an app for mobile devices to connect to your smart home via internet. The problem is the connection is not as smart as expected. heise.de had a short and a long story about that. So the first step is not […]

With the help of Jonas as reviewer I’m one step closer to the solution that was missing in Switch selection. The first version of cancombase is finsihed. The 5×10 cm pcb fits behind the switches in a double plug socket. The 4 pairs in the CAT cable will be used in the following way: Connect […]

Our mirror server has been generating download maps for almost 10 years (since August 2009). This is done by going through all our download log files (HTTP, FTP, RSYNC) and using GeoIP and the Matplotlib Basemap Toolkit to draw maps from where our mirror server is being accessed. I have taken the output from almost […]

Upgraded to Fedora 29 and finally enabled SELinux.

This month’s come together will be held on 2018-12-05, 8pm not at our regular pub (see our mailing list for details).

One of the CRIU uses cases is container checkpointing and restoring, which also can be used to migrate containers. Therefore container runtimes are using CRIU to checkpoint all the processes in a container as well as to restore the processes in that container. Many container runtimes are layered, which means that the user facing layer […]

After using Podman a lot during the last weeks while adding checkpoint/restore support to Podman I was finally ready to use containers in production on our mirror server. We were still running the ownCloud version that came via RPMs in Fedora 27 and it seems like many people have moved on to Nextcloud from tarballs. […]

On October 19th, 2018, I was giving a talk about OpenHPC at the CentOS Dojo at CERN. I really liked the whole event and my talk was also recorded. Thanks for everyone involved for organizing it. The day before FOSDEM 2019 there will be another CentOS Dojo in Brussels. I hope I have the chance […]

This month’s come together will be held on 2018-11-07, 8pm not at our regular pub (see our mailing list for details).