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kekru /
Created Jul 14, 2019
Convert all files of a dir to UTF8

Convert files of a dir to UTF8

Run this script on linux.
Modify the "find" call and the source encoding.
The example will match all .java files in the current folder and its subfolders and converts from Cp1252 (Windows) to UTF-8.


# modify this find call for your needs
kekru /
Last active Jul 8, 2019
IntelliJ Multiple Gradle Projects

Multiple Gradle projects in IntelliJ

This is how to open multiple gradle projects in a single IntelliJ window.

  • File -> New -> Project ... -> Empty Project
  • File -> Project Structure ... -> Modules -> Plus Sign -> Import Module
    • Choose your Module -> Import module from external model -> Gradle -> Next
    • Activate Checkbox: "Create separate module per source set"
    • Activate Radio: "Use gradle wrapper task configuration"
    • Finish

SSH commands

Find out own SSH fingerprint:

ssh-keygen -lf /etc/ssh/

Add own public key to remote server for later verification:

kekru /
Last active Jun 2, 2019
reveal-md integrate plantuml

Integrate plantuml in reveal-md

This is how to integrate plantuml scripts in you reveal-md presentations.

Download the preproc.js from below to your project and replace the plantuml server url with your plantuml server.
Also replace the plantumlDir with your target dir for the generated png files.
Run reveal-md with the preproc.js:

reveal-md --preprocessor preproc.js
kekru /
Last active May 30, 2019
Dockerfile for container-structure-test

Dockerfile for container-structure-test

Use the following docker-compose file. It will build directly from this gist.
To be more stable, copy the Dockerfile and build on your own.

version: "3.3"

kekru /
Last active Nov 27, 2019
Traefik redirect / (root) to sub path with Docker labels

Traefik: redirect base or root path to a subpath

This is tested with Traefik 1.7

This is how to redirect the root or base path to a sub path in Traefik using Docker labels:

  • ->
  • ->
  • -> no redirect
kekru /
Last active Feb 13, 2020
nginx TLS SNI routing, based on subdomain pattern

Nginx TLS SNI routing, based on subdomain pattern

Nginx can be configured to route to a backend, based on the server's domain name, which is included in the SSL/TLS handshake (Server Name Indication, SNI).
This works for http upstream servers, but also for other protocols, that can be secured with TLS.


  • at least nginx 1.15.9 to use variables in ssl_certificate and ssl_certificate_key.
  • check nginx -V for the following:
    TLS SNI support enabled
View gist:3fe759fc98c432b1cbf6507b5bc107d0
/////////// changes for pom.xml
kekru /
Last active Oct 28, 2018
Ubuntu map keybooard special key

My low cost keyboard does not have a less/greater/pipe key....
So I mapped a special key, to the less/greater/pipe key

# find out the keycode of the special key, for me it was 148
# set Strg_r to Mode_switch -> Strg_r + special key will print pipe
sudo xmodmap -e "keycode 0x69 = Mode_switch Mode_switch Mode_switch Mode_switch" 
# set key binding for special key. Replace the keycode with your keycode  
sudo xmodmap -e "keycode 148 = less greater bar"
kekru / 1-WSL and Docker for
Last active Jan 19, 2019
Windows 10 Subsystem for Linux combined with Docker for Windows
View 1-WSL and Docker for

Using Windows Subsystem for Linux combined with Docker for Windows

Docker CE for Windows

  • Install Docker CE for Windows
  • Go to Docker for Windows Settings -> General and enable Expose daemon on tcp://localhost:2375 without TLS.
    This will enable the Docker remote API for requests, coming from localhost, not from another computer in your network. A TLS secured version is not yet supported in Docker for Windows. See for more information. I also tried a daemon.json file with options tlscacert, tlscert, tlskey and tlsverify, but Docker for Windows crashed on booting.

Install Windows Subsystem for Linux (WSL)

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