Docker monitoring
with Grafana, prometheus, cadvisor and exporter
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ESP32 DeepSleep and LoraWAN OTAA join
When the ESP32 goes into DeepSleep and wake up, it will not restart the code execution from where it entered DeepSleep, like an ATmega witch restarts code execution at the same place including all set variables. The ESP32 starts in the Setup function an reinitializes all variables, this means that... [Read More] -
Low power Arduino Pro Mini
For various projects where a long runtime with batteries is important I use a modify Arduino Pro Mini 328 3.3V/8Mhz (ATmega328P). As an example a flashing sketch is used, which turns the LED on for 1 second and off for 8 seconds. [Read More] -
gnupg cannot connect to keyserver
keyserver receive failed: Connection refused
On a docker project where i had to add gnupg keys i always got an error keyserver receive failed: Connection refused. After a while of troubleshooting, i realized it’s not a connection or DNS problem. But that the Dirmngr did not use the configured DNS servers of the system. gpg... [Read More] -
Security hardware key on Github with Firefox
Spoof User Agent in Firefox
Github currently supports hardware security keys (SoloKeys, Yubico, …) as second factor only with Google Chrome but not with Firefox, although Firefox supports U2F and on other sites this also works flawlessly. This browser doesn’t support the FIDO U2F standard yet. [Read More] -
PowerShell and MQTT
A small blog entry how to use MQTT in Powershell, as a library I use M2MQTT. [Read More] -
Setup your own Firefox Sync Server with Docker
If you don’t want your bookmarks, tabs, cronics, … to be stored by Firefox in the Firefox cloud, you can run your self-hosted Firefox Sync server. After that, only the Mozilla-hosted accounts server (https://accounts.firefox.com) is used, but the data is stored locally. [Read More] -
Overlapping subnetworks or how to change Docker default subnet size?
Several services already running were no longer available from subnets after a new container was created using docker-compose. The control of the IP addresses showed that a new network 192.168.X.0/20 was created, which overlapped the existing networks and therefore the communication did not work anymore. [Read More] -
Git Server on Synology NAS
Short HowTo to install and configure of a Git Server on a Synology NAS with DSM 6.2. [Read More] -
Push a multi architecture image to Docker Hub
To create Docker images with multi architecture support, create your Docker image as usual with a tag for the architecture and push them to the Docker Hub. After all images has been pushed, create a manifest file and push them as :latest image to the Docker Hub. [Read More]