Before Deploying the PACC

Perform a series of checks on the platform and cluster before deploying the PACC.

Before you deploy a PACC, or an application container based on the PACC, perform the following checks on the platform and cluster.

On the platform where you plan to deploy... On the data-fabric cluster...
  • Verify that Docker 1.12.5 or later is installed and the Docker daemon is up and running. For download instructions, see this Docker website.
  • Verify that you have sufficient disk space for use by the container.
    • 1 GB for the pre-built images
    • 1.5 GB for the user-created images
  • If you plan to connect to the data-fabric filesystem using the POSIX client, you must verify that you have a license for the POSIX Client for Containers. No license is required to connect to HPE Ezmeral Data Fabric Database or HPE Ezmeral Data Fabric Event Store. To obtain the license, do one of the following:
    • Clusters registered with the MapR Enterprise Trial license can connect unlimited POSIX Clients for Containers.
    • For production use of the POSIX Client for Containers, contact your HPE sales representative.
  • Obtain the information that you will use to set up the container. You need to gather:
    • The cluster name.
    • The time zone of the container. If no time zone is specified, the container uses UTC as the default time zone.
    • The IP addresses of the cluster nodes running the CLDB.
    • A ticket if you need to connect to a secure cluster.

Leveraging filesystem Storage for Application Persistence

The data associated with containers is typically not persistent. If you specify a mount path using MAPR_MOUNT_PATH, any data written to the mounted directory will be persisted to the data-fabric filesystem. For example, you could create a symlink to the Apache log directory and persist all log files in the filesystem.

If you specify a mount path and if your hardware or application fails, re-launching the container in any location using the same Docker runtime environment variables will result in all pre-created data being available for use.

Security Considerations

You should be aware of security considerations for secure and non-secure clusters when using PACCs. See Security Considerations for the MapR PACC.