Containers

Articles related to Expertise / Containers:

Deploy OpenShift Single Node in KVM

Starting with version 4.8, OpenShift can now officially be installed on a single virtual machine (instead of three). This effectively lowers the resources requirements and open up new possibilities for home labs or developer workstations. This article explores how to deploy OpenShift Single Node (SNO) using KVM on your Fedora workstation. Continue reading

Install Kubernetes operators in OpenShift using only the CLI

OpenShift 4 went all-in on Kubernetes operators: they are used for installation of the platform itself but also to install databases, middlewares, etc. There are more and more operators available on the Operator Hub. Most software now provide an operator and describe how to use it. Nevertheless, almost every software documentation I read so far, includes the steps to install the operator using the nice GUI of OpenShift 4. But since my OpenShift environments are provisioned by a playbook, I want to be able to install operators using the CLI only! Continue reading

Airgap OpenShift Installation: move the registry created using oc adm release mirror between environments

Some customers, especially large banks, have very tight security requirements. Most of them enforce a complete disconnection of their internal networks from the Internet. When installing OpenShift in such environments (this is named “disconnected” or “airgap” installation), all the OpenShift images have to be fetched (thanks to oc adm release mirror) in a dedicated registry from a bastion host that is both on the internal network and on the Internet. Continue reading

Deploying Miniflux on OpenShift

Miniflux is a minimalist, open source and opinionated RSS feed reader. There is a hosted instance available at a fair price point but wouldn’t it be cooler to host your own instance on your OpenShift cluster? Let’s do it! Continue reading

Deploying Invidious on OpenShift

Invidious is an alternative frontend to YouTube that is slimmer, faster and at the same time offer more features than YouTube itself. And even more important: it’s Open Source! There is a hosted instance at invidio.us if you want to give it a try. But, wouldn’t it be cooler to host your own instance on your OpenShift cluster? Let’s do it! Continue reading

Running Red Hat SSO outside of OpenShift

In an article named Red Hat Single Sign-On: Give it a try for no cost!, I explained how to deploy Red Hat SSO very easily in any OpenShift cluster. As pointed by a reader in a comment, as widespread OpenShift can be, not everyone has access to a running OpenShift cluster. So, here is how to run Red Hat SSO outside of OpenShift: using only plain Docker commands. Continue reading

One-liner to decode a Kubernetes secret (base64 encoded)

Creating a Kubernetes secret from a value is easy: $ oc create secret generic my-secret --from-literal=secretValue=super-secret secret/my-secret created But getting back this value (from a Shell script, for instance) is not so easy since it is now base64 encoded: $ oc get secret my-secret -o yaml apiVersion: v1 kind: Secret metadata: name: my-secret namespace: qlkube type: Opaque data: secretValue: c3VwZXItc2VjcmV0 Hopefully, since the latest versions of Kubernetes, there is now a one-liner to extract the field and base64 decode it: Continue reading