Building containerized applications

Learn how containers and Kubernetes have changed development process and development tools.  

Red Hat’s lightweight, open standards-based container toolkit is now fully supported and included with Red Hat Enterprise Linux 8. Built with enterprise IT security needs in mind, Buildah (container building), Podman (running containers), and Skopeo (sharing/finding containers) help developers find, run, build, and share containerized applications more quickly and efficiently, thanks to the distributed and daemonless nature of the tools. 

What are Red Hat's tools for containers?

Linux containers are ideal for deploying microservices-based, cloud-native applications. Red Hat Enterprise Linux 8 contains and fully supports Red Hat’s lightweight, open standards-based container toolkit. It also provides several new features to simplify and improve container development, management, and security.

 

Buildah

Buildah

Buildah allows you to build and modify containers without any daemon or docker. It preserves your existing dockerfile workflow while allowing detailed control over image layers, content, and commits. Buildah also minimizes container image size by using tools from the container host rather than adding them to the container image.

Podman

Podman

Podman is a complete, daemonless container engine for running, managing, and debugging OCI-compliant containers and pods. It lets you manage containers without the daemon dependency and is docker command-line interface (CLI) compatible. Podman also provides improved integration with systemd. With Podman, you can easily find, build, run, and share containers. Switching from Docker to Podman is easy and intuitive—two commands are all you need.

Skopeo

Skopeo

Red Hat Enterprise Linux 8 also includes Skopeo, a new, comprehensive tool and library for inspecting, signing, and transferring container images. This advanced container sharing allows you to inspect, verify, and sign image manifests. Move container images between registries. Skopeo uses the same code-base library used by Buildah, Podman, and CRI-O, a lightweight container engine for Kubernetes.

Podman guide for containers cover image

Podman guide for containers

Podman is one of the next-generation container tools (along with Buildah and Skopeo) included in Red Hat Enterprise Linux 7.6 and later. This cheat sheet covers all of the commands that focus on images, containers, and container resources.

 

This cheat sheet explains how to:

  • Find, build, and remove images.
  • Run containers on images.
  • Manage container processes and resources.
  • Work with a container's filesystem.

 

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Use enterprise-grade containers to develop in a hybrid world

Part of the beauty of Linux containers is that they are hybrid by design. That means you can code locally, test in the cloud, and deploy anywhere that Linux containers will run. Most Red Hat developer components are available with dockerfiles, or distributed as Linux container images on Red Hat Enterprise Linux (for local dev) and Red Hat OpenShift Container Platform (local, on-line, or public cloud dev). This means that wherever you develop, test, and deploy, you’re using the same development stacks, on-premise to virtual to cloud. To help you get where you’re going faster, the Red Hat container catalog gives you access to certified, trusted and secure application containers.

 

Try a container

New Container articles

Event-based microservices with Red Hat AMQ Streams

Event-based microservices with Red Hat AMQ Streams

November 21, 2019

As part of Red Hat’s AMQ offerings, Red Hat offers a Kafka-based event streaming solution both for traditional deployment and microservices-based deployment branded as Red Hat AMQ Streams. The Red Hat OpenShift AMQ Streams deployment option is based on Strimzi, an open source tool that makes Kafka deployment as a container on a Kubernetes platform easy because […]

Fixing the oc and Red Hat OpenShift install not downloaded error on macOS

Fixing the oc and Red Hat OpenShift install "not downloaded" error on macOS

November 20, 2019

I recently decided to use my macOS machine to create a Red Hat OpenShift cluster. After downloading the openshift-install command-line tool and running it, however, I received the following error: (Yes, I know the above error is related to the oc command, but it also threw the error and, after I fixed the openshift-install command, […]

Red Hat Software Collections 3.4 and Red Hat Developer Toolset 9 Beta now available

Red Hat Software Collections 3.4 and Red Hat Developer Toolset 9 Beta now available

November 19, 2019

The latest versions of Red Hat Software Collections and Red Hat Developer Toolset are available now in beta. Red Hat Software Collections 3.4 delivers the latest stable versions of many popular open source runtime languages and databases natively to the world’s leading enterprise Linux platform. These components are supported for up to five years, helping to […]

Open Liberty Java runtime now available to Red Hat Runtimes subscribers

Open Liberty Java runtime now available to Red Hat Runtimes subscribers

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Open Liberty is a lightweight, production-ready Java runtime for containerizing and deploying microservices to the cloud, and is now available as part of a Red Hat Runtimes subscription. If you are a Red Hat Runtimes subscriber, you can write your Eclipse MicroProfile and Jakarta EE apps on Open Liberty and then run them in containers on […]

Tracing Kubernetes applications with Jaeger and Eclipse Che

Tracing Kubernetes applications with Jaeger and Eclipse Che

November 14, 2019

Developing distributed applications is complicated. You can wait to monitor for performance issues once you launch the application on your test or staging servers, or in production if you’re feeling lucky, but why not track performance as you develop? This allows you to identify improvement opportunities before rolling out changes to a test or production […]

Pod Lifecycle Event Generator: Understanding the PLEG is not healthy issue in Kubernetes

Pod Lifecycle Event Generator: Understanding the "PLEG is not healthy" issue in Kubernetes

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In this article, I’ll explore the “PLEG is not healthy” issue in Kubernetes, which sometimes leads to a “NodeNotReady” status. When understanding how the Pod Lifecycle Event Generator (PLEG) works, it is helpful to also understand troubleshooting around this issue. What is PLEG? The PLEG module in kubelet (Kubernetes) adjusts the container runtime state with […]

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