Docker considerations

Content Platform for Cloud Scale Administration Guide

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The Docker installation folder on each instance must have at least 20 GB available for storing the Docker images.

Make sure that the Docker storage driver is configured correctly on each instance before installing the product. After you install the product, to change the Docker storage driver you must reinstall the product. To view the current Docker storage driver on an instance, run:

docker info

Core dumps can fill a host's file system, which can result in host or container instability. Also, if your system uses the data at rest encryption (DARE) feature, encryption keys are written to the dump file. It's best to disable core dumps.

To enable SELinux on the system instances, you need to use a Docker storage driver that SELinux supports. The storage drivers that SELinux supports differ depending on the Linux distribution you're using. For more information, see the Docker documentation.

If you are using the Docker devicemapper storage driver:

  • Make sure that there's at least 40 GB of Docker metadata storage space available on each instance. The product needs 20 GB to install successfully and an additional 20 GB to successfully update to a later version.

    To view Docker metadata storage usage on an instance, run:

    docker info

  • On a production system, do not run devicemapper in loop-lvm mode. This can cause slow performance or, on certain Linux distributions, the product might not have enough space to run.