Welcome to Knowledge Basement

Linux, Java, Open Source related how-to articles

How to Choose the Best Linux Distribution

Choosing the best Linux distribution depends on your specific needs and preferences. In the following view I explain how 20+ years of experience with Linux have shaped my views. Here are some factors to consider when selecting a Linux distribution: Remember, there is no single “best” Linux distribution that suits everyone. Experimentation and trying different… read more »

What is a Provider in Java

In Java, a Provider is a class or interface that provides a way to obtain or create instances of a specific type or service. It is a concept that is often used in the context of dependency injection frameworks or service-oriented architectures. Unlike a Supplier, which is a functional interface that provides a single method… read more »

What is a Supplier in Java

In Java, a supplier is a functional interface from the Java.util.function package that represents a supplier of results. It does not take any arguments and returns a value of the specified type. The functional interface defines a single abstract method called “get()” that returns a result. The Supplier interface is commonly used in functional programming… read more »

How to Create a SuSE rpm Package From a Directory

To create an RPM package from a directory such as /opt/asd in SuSE, you can follow these general steps: zypper install rpm-build mkdir -p ~/rpmbuild/{BUILD,RPMS,SOURCES,SPECS,SRPMS} This will create a directory structure that is required for building RPM packages. mkdir -p ~/rpmbuild/SOURCES/asd cp -r /opt/asd/* ~/rpmbuild/SOURCES/asd/ Name: asd Version: 1.0 Release: 1 Summary: Example RPM package… read more »

What is AtomicStampedReference and How to Use It

AtomicStampedReference is a class in Java that provides atomic operations on a reference object along with a stamp or version number. It is typically used in concurrent programming scenarios where multiple threads may need to perform operations on a shared reference object, and there is a need to ensure atomicity and consistency of operations across… read more »

How to Create and Use a Private Docker Registry

Using a private Docker registry offers several benefits: You can create a private Docker registry to host and distribute your own Docker container images within your organization or for specific projects. Here are the general steps to create a private Docker registry: docker push <registry-url>/<image-name>:<tag> docker pull <registry-url>/<image-name>:<tag> Creating a private Docker registry provides you… read more »

What are Docker Image Registries

Docker image registries are central repositories that store and distribute Docker container images. Docker container images are the building blocks of Docker containers, containing all the necessary files, libraries, and dependencies to run a containerized application. Docker image registries serve as a central location where Docker images can be stored, shared, and pulled by Docker… read more »

What is Docker Swarm

Docker Swarm is a native container orchestration solution provided by Docker for managing and scaling containerized applications across a swarm of Docker nodes. It enables you to create and manage a swarm of Docker nodes as a single virtual Docker engine, allowing you to deploy and manage services across a distributed cluster of Docker nodes…. read more »

What is Docker Compose

Docker Compose is a tool that allows you to define, configure, and run multi-container Docker applications using a YAML file. It provides an easy way to define the services, networks, and volumes for your Docker containers in a single configuration file, which can be version-controlled and shared across teams. Docker Compose is particularly useful for… read more »

What are Docker Volumes

Docker volumes are a way to persist and manage data in Docker containers. A Docker volume is a directory or a named volume that is stored outside of the container’s file system and is used to store and share data between Docker containers and the host system. Docker volumes allow data to be preserved even… read more »