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Since I’m relatively new to the world of containers and images, I was excited to learn about the Buildah tool. Especially since I’m a native New Englander and it’s a clever play on how we say Builder in these parts. Buildah is a newly released command line tool for efficiently and quickly building Open Container Initiative (OCI) compliant images and containers. Buildah simplifies the process of cr
The last few days, I have spent some time playing around with Docker’s <none>:<none> images. I’m writing this post to explain how they work, and how they affect docker users. This article will try to address questions like: What are <none>:<none> images ? What are dangling images ? Why do I see a lot of <none>:<none> images when I do docker images -a ? What is the difference between docker images
I often get bug reports from users asking why can’t I use `docker` as a non root user, by default? Docker has the ability to change the group ownership of the /run/docker.socket to have group permission of 660, with the group ownership the docker group. This would allow users added to the docker group to be able to run docker containers without having to execute sudo or su to become root. Sounds g
A developer contacted me about building a container that will run as a log aggregator for fluentd. This container needed to be a SPC container that would manage parts of the host system, namely the log files under /var/logs. Being a good conscientious developer, he wanted to run his application as securely as possible. The option he wanted to avoid was running the container in --privileged mode, r
I’ve heard negative things about the Fedora|CentOS Docker storage configuration in the past, and while manning the Red Hat booth in San Francisco at DockerCon last week, I spoke to a number of people who’ve experienced these storage issues themselves. Much of the trouble, I think, boils down to how Docker in Fedora and CentOS have shipped with a storage configuration that optimizes for a convenien
We would like to announce the general availability of CentOS Atomic Host (May 2015), a lean operating system designed to run Docker containers, derived from Red Hat Enterprise Linux Atomic Host (7.1.2), and built from standard CentOS 7 RPMs. CentOS Atomic Host is produced by the CentOS Atomic SIG, based on upstream work from Project Atomic. CentOS Atomic Host is available as a qcow2 image, as Virt
Having problems with ping in your containers? It might not be what you think! Problem Statement We received a bug report the other day with the following comment: On a RHEL 7 host (registered and subscribed), I can use Yum to install additional packages from docker run ... or in a Docker file. If I install the iputils package (and any dependencies), the basic ping command does not work. However, i
Atomic hosts include Kubernetes for orchestration and management of containerized application deployments, across a cluster of container hosts. If you’re interested in taking Kubernetes for a spin on an Atomic host, read on! Kubernetes+Atomic Hello World First, boot into CentOS Atomic host. You ought to be able to use Fedora Atomic as well, but currently, Atomic Fedora comes with an earlier versio
Atomic Host Is Being Sunset The Atomic Host platform is being replaced by CoreOS. The Fedora project is no longer producing new versions of Atomic Host, but still provides updates for the Fedora 29 version of Atomic Host. The CentOS project continues to rebuild the RHEL 7 based versions of Atomic Host, but there is no plan for a RHEL 8 or CentOS 8 version of Atomic Host. Users of Atomic Host are e
Deploy and Manage Your Containers in the Next-Generation Container OS Use immutable infrastructure to deploy and scale your containerized applications. Project Atomic mainly comprises Atomic Host, Team Silverblue, and various container tooling. cloud native platforms. Twitter Facebook Google+ RSS Atomic Host Atomic Host provides immutable infrastructure for deploying to hundreds or thousands of se
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