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Github: automated build and publish of containerized Spring Boot app using GitHub Actions


Categories: Containers, Development, Java

Github Actions provide the ability to define a build workflow directly in Github.  The workflow steps are defined as yaml and can be triggered by various events, including a code push, branch, or tagging in the repository. In this article I will detail the steps of creating a simple Spring Boot web application that when … Github: automated build and publish of containerized Spring Boot app using GitHub Actions

Github: locally invoked release process for a Gradle built Java Spring Boot project


Categories: Containers, Development, Java

The GitHub “Release” page for a repository can provide your consumers a convenient way to download a binary version of your software as well as track the latest changes and enhancements. In this article, I will show how to invoke a local release process for a Java Spring Boot jar built with Gradle.  A new … Github: locally invoked release process for a Gradle built Java Spring Boot project

Java: build OCI compatible image for Spring Boot web app using jib


Categories: Containers, Java, Kubernetes

While working on your Spring Boot web application locally, gradle provides the ‘bootRun’ for a quick development lifecycle and ‘bootJar’ for packaging all the dependencies as a single jar deliverable. But for most applications these days, you will need this packaged into an OCI compatible (i.e. Docker) image for its ultimate deployment to an orchestrator … Java: build OCI compatible image for Spring Boot web app using jib

Java: Creating Docker image for Spring Boot web app using gradle


Categories: Containers, Development, Java

While working on your Spring Boot web application locally, gradle provides the ‘bootRun’ for a quick development lifecycle and ‘bootJar’ for packaging all the dependencies as a single jar deliverable. But for most applications these days, you will need this packaged into an OCI compatible (i.e. Docker) image for its ultimate deployment to an orchestrator … Java: Creating Docker image for Spring Boot web app using gradle

Kubernetes: running a mail container for testing email during development


Categories: Containers

If you are in the development lifecycle and need to quickly test email functionality, you can deploy the codecentric/mailhog image directly within Kubernetes.  It will receive all email regardless of address, and from its web interface show you all the email that has been received. In this article, I will show you how to deploy … Kubernetes: running a mail container for testing email during development

Docker: building an ntp server image with Alpine and chrony


Categories: Containers

If you need a lightweight NTP server, an Alpine based container image with a chrony daemon takes up minimal runtime resources and is about 8Mb in size. I have pushed ‘fabianlee/docker-chrony-alpine‘ to docker hub.  The run command requires that you specify linux capabilities and a volume for the chrony.conf file, so the easiest way to … Docker: building an ntp server image with Alpine and chrony

Docker: determining container responsible for largest overlay directories


Categories: Virtualization

Whether you are running a docker daemon on a development host or a GKE worker node using Docker as the container engine, it is important to understand the amount of disk storage being utilized by the containers. If you navigate into the ‘/var/lib/docker/overlay2’ directory, you will  see cryptic hashed ids representing the containers layers instead … Docker: determining container responsible for largest overlay directories

Docker: Visualizing image hierarchy and container dependency using dockviz


Categories: Containers, Scripting

The Docker console commands for listing and viewing containers and images (ps, images, history, inspect) provides a wealth of information, but when you are managing hundreds of containers, a graph view of the container inventory and their dependencies can be critical for operations. Dockviz can help you visualize your containers and images by creating an PNG image … Docker: Visualizing image hierarchy and container dependency using dockviz

OpenWrt: Installing a TFTP Server on Ubuntu for OpenWrt Firmware Updates


Categories: Linux, OpenWrt

The Trivial File Transfer Protocol (TFTP) is an extremely simple protocol most often used for network booting strategies, such as PXE and flashing OpenWrt images unto consumer routers. I go over full instructions for flashing OpenWrt using Ubuntu and flashing a sysupgrade in another post, this article will focus specifically on setting up a tftp … OpenWrt: Installing a TFTP Server on Ubuntu for OpenWrt Firmware Updates