Docker Volumes and Networking

Presentation from Docker Indianapolis: http://www.meetup.com/Docker-Indianapolis/events/225508133/

Transcript

1. Docker Volumes and Networking @ehazlett
2. Volumes
3. What are Docker Volumes? • Storage outside of the container • Data persistence • Can be shared between containers • Support for plugins
4. Container Storage • Volumes provide storage outside of the container • For example: • docker volume create --name foo • Inspect: • docker volume inspect foo • Creates a volume with storage path: • /mnt/docker/volumes/foo/_data
5. Persistence • Volumes are outside of the container • For example (using the previous example volume): • docker run -ti -v foo:/data alpine ash • Data will persist in this volume when container exits • New container can re-use this persistent volume
6. Sharing • Data can be shared with volumes • docker run -ti -v foo:/data alpine ash • docker run -ti -v foo:/data busybox sh
7. Volume Plugins • Plugins allow custom volume storage • For example: s3, ebs, key-whiz, vault, etc • Simple interface for writing your own • For example, Vault to share keys between containers
8. Networking
9. What’s Coming? • Overlay network • Creates multi-host network across machines • Containers share network
10. Networking • Create a network • docker network create -d overlay prod
11. Services • Create a service on first host • docker service publish app1.prod • Create a service on second host • docker service publish app2.prod
12. Services (cont) • Run a container on first host • cid=$(docker run -d -ti -p 80:80 nginx) • Attach container to service • docker service attach $cid app1.prod
13. Services (cont) • Run a container on second host • cid=$(docker run -d -ti -p 80:80 nginx) • Attach container to service • docker service attach $cid app2.prod
14. Docker Networking
15. Thank you! • Vault Volume Driver: https://github.com/calavera/docker-volume-vault • Network: https://github.com/docker/libnetwork/blob/master/docs/overlay.md • Docker Experimental: https://github.com/docker/docker/tree/master/experimental