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Docker Storage and Configuration in Kubernetes
Persistent storage in Docker and Kubernetes can make or break the usefulness of an application—and can result in mass loss of data if not done right. In this lab, you will verify that an existing container experiences data loss when removed and redeployed, resolve this issue via Docker volumes, then prepare the container for deployment to Kubernetes by creating related Config Map and Secrets objects. Finally, you will deploy the application to Kubernetes and test that it works.
Lab Info
Table of Contents
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Challenge
Verify data persistent issues for the backup tool container
The
backup-toolcontainer is already running with a file stored in the/datalocation; run the tool on the container via thebackup-tool runcommand. Verify the data has been archived on the container via thebackup-tool listcommand. Finally, remove and redeploy the container, then attempt to list the backups again. -
Challenge
Configure a Docker volume for persistent archive data
Create a volume for use with the
backup-toolscontainer. Redeploy the container using that volume mount, then run thebackup-tool runcommand on the container. Review the backups again, then remove and redeploy the container, ensuring the volume is mounted. Verify the backups are still there. -
Challenge
Create Kubernetes Config Map and Secret objects
Create a Config Map,
backup-env-config, storing theRETENTION_DAYS,BACKUP_PREFIX, andPOLL_SECONDSvalues for use with the pod deployment. Create a second Config Map,backup-file-configfor thebackup.conffile data. Likewise, create a Secret,backup-passphrase, to store a passphrase for use with data encryption. -
Challenge
Deploy to Kubernetes and verify the deployment
Deploy the
backup-toolto the Kubernetes pod using the supplied manifest. Copy some test data to the watched location withkubectl cp, then back up the data and confirm the backup archive exists.
Real skill practice before real-world application
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