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![Docker volumes help store state from
the application to locations outside the
docker image. They are logical
primitives for shared storage when
combined with plugins.
• Data is local to engine host only.
• Bind-mounts also local, bypass
UFS.
• Data is inflexible, prone to loss.
Docker Volumes
$ docker run
--name my-special-container
-v /container/dir busybox
[{e779eb1/var/lib/docker/volumes/e779eb1/_
data /container/dir local true }]](https://image.slidesharecdn.com/dc16ryanwallner-160624203657/75/Everything-You-Need-to-Know-About-Docker-and-Storage-by-Ryan-Wallner-ClusterHQ-6-2048.jpg)
![Example
$ docker run --name my-container
--volume-driver flocker
-v vol:/data busybox
my-container
$ docker inspect -f “{{.Mounts}}” my-container
[{vol /flocker/71887326.. /data flocker rw true rprivate}]](https://image.slidesharecdn.com/dc16ryanwallner-160624203657/75/Everything-You-Need-to-Know-About-Docker-and-Storage-by-Ryan-Wallner-ClusterHQ-8-2048.jpg)
Uploaded byDocker, Inc.
Everything You Need to Know About Docker and Storage by Ryan Wallner, ClusterHQ
The document provides an overview of Docker and its storage capabilities, emphasizing the differences between stateful and stateless containers. It discusses Docker volumes as a means to manage application state external to Docker images, highlighting the use of plugins for shared storage. Additionally, the document covers volume management within UCP and the features offered by VolumeHub for monitoring and managing Docker volumes.
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Everything You Need to Know About Docker and Storage by Ryan Wallner, ClusterHQ
- 1. Everything you needto know about Docker and storage. Ryan Wallner Technical Evangelist, ClusterHQ
- 2. Key Concepts Stageful vsStateless Volumes Plugins Agenda Volumes & UCP UCP + Volumes External Volumes VolumeHub Demo Creating Volumes Manage Volumes Workloads
- 3. Key Concepts Docker &Storage
- 4.
- 5. "Stateful" Container • Secrets- public/private keys, password, etc • Databases - databases, sharded, clustered. • Logs - to collect support bundles, run analytics for data mining, etc. • Other - CI repo data, transcoded bits... Stageful vs. Sateless "Stateless" Container • Nothing to Disk • Web Front-End • Can stop and start as many containers as you’d like • Like http is stateless • Container is ephemeral • What has happened or changed will be lost.
- 6. Docker volumes helpstore state from the application to locations outside the docker image. They are logical primitives for shared storage when combined with plugins. • Data is local to engine host only. • Bind-mounts also local, bypass UFS. • Data is inflexible, prone to loss. Docker Volumes $ docker run --name my-special-container -v /container/dir busybox [{e779eb1/var/lib/docker/volumes/e779eb1/_ data /container/dir local true }]
- 7. Enable external storagemanagement such as shared-storage for volumes. • Data is external to engine host. • Enables HA for data. • Data can move with container. Docker Volume Plugins
- 8. Example $ docker run--name my-container --volume-driver flocker -v vol:/data busybox my-container $ docker inspect -f “{{.Mounts}}” my-container [{vol /flocker/71887326.. /data flocker rw true rprivate}]
- 9.
- 10. Volumes & UCP Docker& Storage
- 11. Volumes in UCP •Create, Delete, Use from UI • Takes advantage of volume drivers. • Limited view into volume management
- 12. VolumeHub • Clear visibilityfor volume management. • Current status of volumes and their operations. • Searchable name and metadata. • How much storage in use by size of volumes.
- 14.
- 15.