红帽全球峰会第 2 章 Types of container images
The container image is a binary that includes all of the requirements for running a single container, and metadata describing its needs and capabilities.
There are two types of container images:
- Red Hat Enterprise Linux Base Images (RHEL base images)
- Red Hat Universal Base Images (UBI images)
Both types of container images are built from portions of Red Hat Enterprise Linux. By using these containers, users can benefit from great reliability, security, performance and life cycles.
The main difference between the two types of container images is that the UBI images allow you to share container images with others. You can build a containerized application using UBI, push it to your choice of registry server, easily share it with others, and even deploy it on non-Red Hat platforms. The UBI images are designed to be a foundation for cloud-native and web applications use cases developed in containers.
2.1. General characteristics of RHEL container images
Following characteristics apply to both RHEL base images and UBI images.
In general, RHEL container images are:
- Supported: Supported by Red Hat for use with containerized applications. They contain the same secured, tested, and certified software packages found in Red Hat Enterprise Linux.
- Cataloged: Listed in the Red Hat Container Catalog, with descriptions, technical details, and a health index for each image.
- Updated: Offered with a well-defined update schedule, to get the latest software, see Red Hat Container Image Updates article.
- Tracked: Tracked by Red Hat Product Errata to help understand the changes that are added into each update.
- Reusable: The container images need to be downloaded and cached in your production environment once. Each container image can be reused by all containers that include it as their foundation.
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