Tmux new session detach and attach
If you want to run a job on a server, you can start a new tmux session, detach from it and attach back at a later point of time. Starting a tmux session within a …
Synchronize local GIT repo with origin
You can synchronize the local GIT repository with ORIGIN. This can be useful to remove already removed branches from the local repository if these were deleted in ORIGIN. After executing this command, all branches, that …
Change the main branch in GIT
Assume the current main branch is named master and you you created a new branch with the name main that should be the new main branch. Also assume, that you have forked the main repo …
Oh-my-zsh
If you are searching for a nicely themed shell replacement of the bash with multiple plugins support, the oh-my-zsh is a good starting point. You can get information about the project from: https://github.com/ohmyzsh/ohmyzsh I recommend …
Resize images with mogrify
If you want to resize numerous images within a folder, you can use the ImageMagick command mogrify. The parameters are: resize: maximum with of 1200px path: where to store the resized images format: change the …
Git: Clone repo and create new origin and upstream
The task is to clone a repository and set a new origin. Additionally, the original origin becomes a new upstream. Step 1: Clone the original repository Step 2: Remove the original remote origin from the …
Change the local installed Java version
To display the currently used version of Java you can execute in your shell: Additionally, also the installed versions can be checked by: Within the former dialog, you can change the default Java version that …
Remove network interfaces from the system via script
If you have network interfaces running that are not wished or which could block other network services (like a VPN connection), you can remove them by using ifconfig. The currently running netwro interfaces can be …
Docker remove old images and containers
By the time, old images and containers are still on the system and use a lot of disk space. Show old containers and images See the docker images with their ID: See the stopped docker …
science of colours – colour rules
Why are colours so important? If we make decisions that include colours, these are influenced by the occuring colours. Like the colour of a product or whether I should click the blue or the red …
Transform your Play Application into a Progressive Web App (PWA)
If you want to transform your Play Application (https://www.playframework.com) into a Progressive Web App, you can do this by the following steps. The following example is implemented by using Play 2.6.15. Why choosing a PWA? …
Create GIT repository archive
Sometimes it is necessary to create an archive of the files of a GIT repository, e.g. if you want to sent the files to another person. Therefore you can use the git archive command which …
Git command to display the formerly changed files with assitional status information
If you need to see the formerly changed files of a push, you can use the following commands to display specific information with or without a diff. Display the last changes with a diff of …
Cassandra source to retrieve data for specific data types with Apache Flink
The default CassandraSink of Apache Flink is used to store data to Cassandra. If you want to retrieve data from Cassandra, you need another implementation that allows the access of the Cassandra cluster and the …
Apache Flink InvalidTypesException because of type erasure problem
If you implement an own InputFormat to access a Cassandra database from Apache Flink, you could probably extend the RichInputFormat. The following example defines the entry point for the specification of an own InputFormat that …
Basic Cassandra commands
The following commands and shell options are used with Cassandra 2.2 and 3.x. Increase Request Timeout for local database connection The following option increases the request timeout for the current session. Clear all former snapshots …
Exchange data between paragraphs of Spark and Flink interpreters with InterpreterContext within Apache Zeppelin
If you have to exchange data from Flink to Spark or Spark to Flink within Apache Zeppelin, you can use the InterpreterContext to store and reload data between the separated paragraphs. You can load the …
Workign with Kafka and Zookeeper within Docker or from source
If you are working with Kafka and Zookeeper to create some test cases or for the work in bigger projects, you can install them directly from the respective project website or make an installation with …
Replace commit messages within rebase process to squash entries by using vim
If you have a GIT project and want to make a rebase and squash from your feature branch against the master branch, you can simplify the adaptation of the pick entries to s (squash) by …
Kafka network client created connection error because of missing Broker
The following error occured within a Docker environment that contains Apache Kafka and Zookeper and is managed by Confluentinc. It was a mess to find the solution. First, we checked the source code and the …