podman pull registry.access.redhat.com/ubi8Exercise 1.1 - Pulling Container Images
Section 1: Pull RHEL Images
Step 1. Use the following command to pull a RHEL image from the Red Hat repository:
podman pull command
Images are accessed using the container registry URL (registry.access.redhat.com). If the container registry URL is not specified in the pull command, it could result in the retrieval of an image that originates from an untrusted registry.
An image is identified by:
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Repository name (registry.access.redhat.com)
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Namespace name (ubi8) and
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Image name .
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Optionally, a tag can be added (which defaults to :latest if not entered) to ensure retrieval of the required image.
(There can be multiple versions of the same image, within the registry. A specific version can be selected by adding a tag, such as :latest to form a name such as rhel7:latest or ubi8:8.7-231.)
Step 2. Try the Skopeo command
Skopeo provides the ability to inspect containers stored in a registry. The Inspect feature displays details of the selected container. The 'skopeo inspect' command’s ability to list all the tags associated with a selected container is a benefit over the docker tool.
skopeo inspect docker://registry.access.redhat.com/ubi8Step 3. Try the Podman command
Podman can be used to see what container images are in the local repository:
podman imagesREPOSITORY TAG IMAGE ID CREATED SIZE registry.access.redhat.com/ubi8 latest 7a840db7f020 2 days ago 211MB
Section 2: Inspecting the container tools environment
Now that you have the Linux container tools installed, with a few containers available, you can start investigating what makes up a container.
Run podman info option to check the container environment details.
podman info command
podman infohost:
MemFree: 1050951680
MemTotal: 1926369280
SwapFree: 0
SwapTotal: 0
arch: amd64
cpus: 1
hostname: ip-10-0-2-211.ec2.internal
kernel: 4.18.0-862.3.2.el7.x86_64
os: linux
uptime: 19h 36m 30.42s (Approximately 0.79 days)
insecure registries:
registries: []
registries:
registries:
- registry.access.redhat.com
store:
ContainerStore:
number: 0
GraphDriverName: overlay
GraphOptions:
- overlay.override_kernel_check=true
GraphRoot: /var/lib/containers/storage
GraphStatus:
Backing Filesystem: xfs
Native Overlay Diff: "true"
Supports d_type: "true"
ImageStore:
number: 0
RunRoot: /var/run/containers/storage
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