ibmredhat 8 & @OpenShift #container management #devops
ibmredhat have removed the Docker container engine, along with the docker command, from Red Hat Enterprise Linux 8 entirely. For RHEL 8, Docker is not included and not supported by Red Hat (although it is still available from other sources)
- Xhttps://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/pdf/building_running_and_managing_containers/Red_Hat_Enterprise_Linux-8-Building_running_and_managing_containers-en-US.pdfX
with ibmredhat the focus is not on running individual containers from the command line. The primary venue for running containers is a Kubernetes-based platform, such as OpenShift.
By repositioning OpenShift as the project for running containers, container engines like Docker become just another component of OpenShift with no direct access by end users.
Because the container engine in OpenShift is not meant to be used directly, it can be
implemented with a limited feature set that focuses on doing everything that OpenShift needs, without having to implement lots of standalone features
Tools like podman, skopeo, and buildah were developed to take over those docker command features.
the newworld tools are
- buildah
- libpod / podman
- runc
- skopeo
ibmredhat universal base image (UBI) containers
to build a container run buildah
$ buildah bud -t mycontainer Dockerfile FROM registry.access.redhat.com/ubi8/ubi ADD myecho /usr/local/bin ENTRYPOINT "/usr/local/bin/myecho" CMD "/usr/local/bin/myecho" myecho echo "This container works!"
to manage, run, stop, start a container use podman
$ podman run -i -t -p 8080:80 --name=pho photon /bin/bash
$ podman inspect --format='{{.Path}}' pho
$ podman logs pho
$ podman stop pho
$ podman start -i -a pho
to copy containers use skopeo
$ skopeo
VIZZ8INFO 
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