Red Hat OpenShift

Learn about authorization such as user privileges, levels of access, and how they're different in part three of this four-part video series.

Learn about numeric errors and the dangers of using incorrect data types in part two of this four-part video series.

(Part 1)Learn about recommended practices for producing secure code with input validation in part one of this four-part video series.

We know that containers in Openshift or Kubernetes don't persist data. Every time we start an application, it is started in a new container with an immutable Docker image. Hence, any persisted data in the file systems is lost when the container stops. Hence if an application or container is rebuilt or restarted than we can't view previous logs or if we are using containers with mysql or any other database then schema, tables, and all data will be lost...

Minishift

In this session, Diógenes gives an introduction of the basic concepts that make OpenShift, giving special attention to its relationship with Linux containers and Kubernetes.

Article

The release of OpenShift Container Platform 3.6 brings support for vsphere cloud provider. This provides vsphere VMDK dynamic provisioning for persistent volumes for container workloads. The storage presented to vsphere virtual machines as a VMDK has ReadWriteOnce access mode. In the OCP 3.6 on vSphere reference architecture, much of this process is automated and can be implemented easily. Virtual Machine Disks or VMDKs exists in virtual machines. Configuring the OCP cluster for vsphere cloud provider support requires: Master Node Configuration...

At the beginning of October, I attended JavaOne in San Francisco to present on WildFly Swarm and Apache Kafka. For those of you that weren't able to attend the session, or for those that did and saw first hand the issues with the demo, I will be covering all the details of how the demo should work! The presentation material that was presented at JavaOne can be found here, and all the code for the demos is in GitHub. MiniShift...

I've started an interesting exploration on the integration of Microsoft Windows Containers and Linux Containers in an OCP Environment. This allows a true bi-modal IT technical implementation by combining the strength of both platforms into one cluster. So, I start this off, with the deployment of an OpenShift Cluster on Azure, using the 3.6 reference architecture. After this is run, I used the Azure Portal to add a Windows Server 2016 Node to the cluster. So if you look closely...

Visual Studio provides a graphical remote debugging ASP.NET Core app with Docker Tools for Windows. Since Visual Studio supports SSH protocol, you can remote debug ASP.NET Core process running on the Linux host. It used to be if you install and setup SSH server on docker container, you can remote debug with Visual Studio. However, it's strongly not recommended due to security reasons. Now I'll explain to you how to remote debug your ASP.NET Core on OpenShift with Visual Studio...

Article

It was a beautiful and lazy Saturday morning in Bengaluru, on 7 October 2017. Kubernetes arrived here and decided it was a great day to meet up with some of its friends here and spend some quality time with them. But alas! Kubernetes could not speak, at least not yet. It certainly could grow and shrink, at moments notice no less, but words, no, those failed it. It needed some help, from some of its most trusted friends, those it...

Installation of AWX (Ansible Tower) on top of OpenShift, Set a dynamic inventory to access the servers from AWS

Introduction As you may already know, the Red Hat Mobile Application Platform (RHMAP) is available as a self-administered, on-premise, installation as well as a hosted platform. This offers more opportunities for customers to benefit from increased security, flexibility and control over their platform. Note: This installation is strictly for sandbox demonstration purposes. In the interests of simplicity, it will be running on infrastructure that will not be secure so no confidential data should be stored in this instance. Preparation Before...

When you build your .NET Core project, NuGet packages are retrieved from nuget.org by default. Sometimes, however, you might want to use a local NuGet repository. For example, you may want to: use private NuGet packages, but you don't want anyone except your associates to see them. cache a NuGet repository at a server near your build servers leave your build server disconnected from the Internet. I'll explain how to set up a private NuGet server on OpenShift and how...

As part of a two-day microservices workshop I’m putting together, I’ve been thinking a lot about how to explain monolith-application decomposition and what a transition to microservices might look like. This is a small subset of that material, but I want to share it with you to get feedback (in the workshop we go into more detail about whether you should even break up your monolith). I base this on my own tried and true real-life experience as well as...

After a number of months with .NET Core 2.0 previews, Microsoft has released .NET Core 2.0. Very exciting for the open source world! If you've not seen Scott Hunter talk about today's announcement, see it here. Red Hat has been offering .NET Core 1.1 for a while now, and we expect many customers to be interested in 2.0. Stay tuned for more.

We want you to have the best experience in getting your questions answered. We believe StackOverflow's Q&A format, along with its excellent features and moderation, will reach a broader community of developers who can help respond to your questions. As a result, we've made all of our product forums read-only. You can search for technical developer questions about our products on our StackOverflow page [1], or you can post your questions to StackOverflow using the relevant tags [2]. Red Hat...

I've been using containers for nearly 3 years, initially working in the Technical Support team helping customers solve problems in their applications and giving advice about best practices to run containers. Today I work on a team where we develop containers to use in our OpenShift environment, and because of my Technical Support background, my troubleshooting skills helped me in this task. I run containers for most of my tasks and it makes my life easier. I can run any...

This article will show how OpenTracing instrumentation can be used to collect Application Metrics, in addition to (but independent from) reported tracing data, from services deployed within Kubernetes. These Application Metrics can then be displayed in your monitoring dashboard and used to trigger alerts. THE EXAMPLE APPLICATION In a recent article, we showed how a Spring Boot application could easily be instrumented using OpenTracing. The example we are going to use in this article uses the same approach to create...

I’m assuming you’ve already tried to run some example of a multi-container application. Let’s say we have an application composed of the following: Web service Database Key-value store Worker Let’s focus on the database now. Container images for databases usually come with an easy way to configure them via environment variables. The great thing about this approach is how easy to use it is, e.g. let’s take our RHSCL PostgreSQL 9.5 container image. If you try to run it just...

Article

With a major release, you would usually expect major modifications in the core of the framework. But this time, the migration is not too complicated. Not only because of the migration tool provided to make a smooth transition from Framework 7 to Framework 8, but also because of the similarity in many of the components’ APIs. A good upgrade strategy is needed though, and I summarized them under the following headlines: Upgrade dependencies in the POM file Run Maven goal...