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Configuring default Project creation in Openshift

In this blog we will have a look at “Configuring project creation” in an Openshift cluster. We will: Create a Project Template Add resources like a limit-range to the template Disable proje...

Controlling Ingress with Openshift Network Policy's

This blog will go in to the “software defined networking” of “Configure networking components” objective of the EX280 exam from RedHat. In this post we will: Traffic to pods The types of Netw...

Exposing services with routes and SSL

This blog will go in to “Configure networking components” objective of the EX280 exam from RedHat. In this post we will: Have a look at services Expose a service with a URL Check out the ty...

Manage users and policies, groups and permissions

This blog will cover the “Manage users and policies” objective of the EX280 exam from RedHat. In this post we will: Configure the HTPasswd identity provider for authentication Create and dele...

Switch iTerm profile when running Vim

I love using iTerm2 and Vim on my Mac. Today we are going to have a look at Profile Switching feature that iTerm2 has and how we can combine this with Vim. Recently I wrote about using vim-plug to...

Pod Affinity and Anti-affinity - Spreading out workloads

I have written about using Taints and Tolerations to prevent pods from running on certain (tainted) nodes and there is some influence on scheduling that we can exert using Limits and Requests. But...

Quotas, limits and limit-ranges

In this post we will be diving in to quotas and limits. Quotas and limits can be used to allocate, limit en reserve resources within your cluster for one or multiple namepaces and can limit the usa...

Scaling applications - Rollout, Scale and Auto-Scale Deployments

This post is gonna be a bit bigger broader then what is requested on the EX280 exam objectives. In this post we will have a look at: Controlling roll-out of pods (manually rolling out or back a ...

ServiceAccounts and SCCs - Running pods with more permission's

In this blog we will take a look at SCC permissions that are needed to run a pod with escalated permissions and how to use a serviceaccount (sa) to run such a pod or deployment. Small thing: I use...

Creating and Using Secrets in OpenShift

Creating Secrets (like creating ConfigMaps) is a vital part of Managing OpenShift workloads and is an exam objectives of the EX280 exam. Knowing how they work and how to configure them (from the co...