How to test opyrator in linux Introduction With opyrator you can create a web function from any python function, it used fastapi, streamlit and pydantic. For this example i just wanted to test what is posible also using pydantic to change some input and output field Setup Start by creating your python virtual environment and activating it python3 -m venv opyrator cd opyrator source bin/activate After that you can install opyrator and what is more needed

If you have a disk image with multiple partitions, this type of image is used a lot for the raspberry pi, you can easily mount them using kpartx, you can install kpartx as follows

arch linux / manjaro sudo pacman -S multipath-tools # ubuntu 24.04 sudo apt install kpartx # centos 8 / oracle sudo yum install kpartx Maybe you need to insert the loop module, if so you can do that like this

I few shorts remarks about selinux, more like a reminder for myself Restore directory permissions, exmple authorized keys files that doesn’t work restorecon -R -v ~/.ssh How to temporarily disable selinux, i use this for debugging to see if the problem is selinux echo 0 >/selinux/enforce # or setenforce 0 And to enable them again use echo 1 >/selinux/enforce # or setenforce 1

Hello, I once needed to split a mysql dump in to multiple files, one per database so i used this awk one liner. awk -F'`' '{if ($0 ~ /^– Current Database:/) db=$2; print >> db"-split.sql"}' mysql_dump.sql If you need to split one table from one database you can try the following bash scripts !/bin/bash export DATABASE="$1" export TABLE="$2" echo $DATABASE echo $TABLE awk '/Table structure for table .'$TABLE'.$/,/UNLOCK TABLES/{print}' $DATABASE-split.sql

I wanted to control the my television and blu ray player/receiver from my pi, so i installed the client on my raspbian pi installation. Everytime cec_client start it’s does some initializing, so i wanted to run is as some kind of daemon, i thought about a fire options, like maybe some expect kind of script without daemoniziing or a python with python expect to run it and control it, with mayne a socket.

Once in a will you need you have a lang running script that you started into a shell but you want to transfer it to a screen. For this i am using the reptyr program which i installed with sudo pacman -S reptyr or sudo apt-get install reptyr find pid ps ax | grep ssh # find pid 34177 (for example) # start a screen screen -S my_screen_name # in de screen start reptyr reptyr 34177 if you get a issue with ptrace scope just change this value echo 0 | sudo tee /proc/sys/kernel/yama/ptrace_scope

If you want to start some daemon in the background you can install daemontools and user supervise, but i like to use screen to start daemons in the background, so that i can easily see the output.

check screen if ! /usr/bin/screen -ls | awk '{print $1}' | grep ".${SCREEN_NAME}$" >/dev/null; then echo "starting $SCREEN_NAME" screen -S "${SCREEN_NAME}" -d -m "$COMMAND_SCRIPT" fi I use this snippet, to check of a screen with a given name exists and if not start it up, i run a script i call screen-ls.

The Raspberry Pi is typically booted from an SD card which contains the bootloader and the root partition. This can be limiting from a space and speed perspective,and writes to the card will slowly cause it’s death. SD media doesn’t typically use the same wear leveling technology that goes into a solid state drive. Today I’ll take a quick look at how you can boot your Pi from an NFS server.

On-demand activation of Docker containers with systemd One of the features of systemd is its ability to defer the start-up of networked applications until their services are actually requested, a process referred to as socket activation. This isn’t really a new an idea; systemd borrowed the idea from launchd which has been in OS X since Tiger’s release in 2005, and the venerable Unix inetd has implemented a simpler version of it since the 1980s.

Bash locking Intro Once in a while i want to start a bash script and make sure it one at a time. So searching for solution for creating a lock file in bash, you want to have a solution that doesn’t create a race condition. Explanation Start defining which lockfile you want to use export lockfile=/tmp/lockfile.txt Get pid from lockfile, return empty string if file doesn’t exists or is empty For added protection removed character from the file that isn’t a number