Cloud Foundry by Duncan C. E. Winn

Author:Duncan C. E. Winn
Language: eng
Format: epub
Publisher: O'Reilly Media
Published: 2017-05-29T04:00:00+00:00

On a write, the container copies that write to a layer above the base image.

When the container does a read, it first checks the top level and then goes down for the read-only content.

Untrusted containers (containers such as Docker that can run as a pseudo root) also often use a layered filesystem. A Docker container image is slightly more complex than just a single filesystem. Docker images are constructed from a Dockerfile, a script containing a set of instructions for building a Docker image very similar to a vagrant script used for building VMs. Every line in the script becomes a layer stored upon the previous layer. The Docker image can then build up multiple filesystem layers on top of one another. In addition to the layered filesystem, Docker images usually also contain metadata such as environment variables and entry points. Cloud Foundry must apply a quota to the rootfs to stop users from pushing containers with, for example, 100 GB of MapReduce data.

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