I wanted to have the option to run a web-application on my local machine, and make it seem as if it is running as part of a collection of web-applications on a remote cluster. The collection of web-applications on the cluster make up the whole of a web-site, and during development you might want to “replace” one of the web-app’s by a version on your own machine, which is under development. Note: where this story mentions web-app or web-proxy, you…
Introduction If you are running your pod (services / containers) on a Kubernetes cluster, and the pod runs into problems, you can decide to take it out of the load, but keep the pod running for further investigations. TL;DR; See the notes section on this site for the short summary; Note: Kubernetes Isolate Crashed Pod Kubernetes Recap Lets start with a summary of the Kubernetes components which are involved, here is a small (simplified) recap of how the parts fit…
Suppose you have a kubernetes cluster, which contains a large set of ingress rules, of which many are used for the same hostname (just using different context-root’s / paths). In this case it can be hard to find out which rule is used for a certain URL. To help out in this situation I have created a Linux script to make a nice overview of paths mapped to what services by which ingress rules. You still have to read through…
The last number of years I have been working in the area of migrating from legacy monolith (web) applications to a (micro) service oriented architecture (in my role of Java / DevOps / Infrastructure engineer). As this is too big of a subject to put in a single blog post, I will split this in 6 parts; (1) Overview, (2) Gateway, (3) Identity Provider, (4) Oauth2/Scopes, (5) Migrating from Legacy, (6) Oauth2 and Web. Oauth2 and Web: To-Do or not…
The last number of years I have been working in the area of migrating from legacy monolith (web) applications to a (micro) service oriented architecture (in my role of Java / DevOps / Infrastructure engineer). As this is too big of a subject to put in a single blog post, I will split this in 6 parts; (1) Overview, (2) Gateway, (3) Identity Provider, (4) Oauth2/Scopes, (5) Migrating from Legacy, (6) Oauth2 and Web. Introduction Lets start by defining the…
A trip down memory lane… A long time ago, in 2015, we were running an Oracle WebLogic 11G cluster, which needed to be upgraded to 12C. However, Oracle did only support rolling upgrades for minor versions, not for major versions… In the image above, you see a simplified layout of our cluster (there were more servers and instances in the real setup). Traffic comes in from the left, via a load-balancer (and some apache’s). It was spread across the managed…
The last number of years I have been working in the area of migrating from legacy monolith (web) applications to a (micro) service oriented architecture (in my role of Java / DevOps / Infrastructure engineer). As this is too big of a subject to put in a single blog post, I will split this in 6 parts; (1) Overview, (2) Gateway, (3) Identity Provider, (4) Oauth2/Scopes, (5) Migrating from Legacy, (6) Oauth2 and Web. Introduction Recap: In the previous articles…
Summary We are using (self hosted) Jira (the Atlassian Issue Tracker / Scrum / Kanban Board) at the office. And we wanted to receive a chat notification for each newly created ticket, to be received in Microsoft Teams Channels. Teams is a collaboration messenger tool like Slack or RocketChat. Jira can send new ticket/story creations using a web-hook to external tools. The web-hook sends a Jira specific JSON payload, no configuration options possible. The project you are looking at, consists…
For migrating from legacy monolith (web) applications to something more modern and manageable, we have been switching to micro-services. Part 3 of a 5 part blog post shows the Identity Provider component.
Summary I have created a Fluent Bit LUA Filter to force proper data types to be send to our Elastic Search (log collector) Database, to prevent Elastic from rejecting the log records. GitHub Project: https://github.com/atkaper/fluent-bit-lua-filter-elastic-data-types Environment We are running a bunch of (on premise) Kubernetes clusters, all having around 20 nodes, with many deployments on it. The deployments use different technologies; Java, Kotlin, Node.js, GO, Python, C, … and quite some standard open source applications. Most of them have been…