Docker, From utopia to reality

Feedback on the use of Docker at scale. What does it mean to start/stop large amount of containers, what you should take care of.

Transcript

1. TakeOff Conference 20 Oct 2016 FROM UTOPIA TO REALITY
2. Léo Unbekandt @Soulou CTO, Scalingo
3. Our usage of Docker
4. 1000s Containers started/stopped every day
5. Building images App code - Runtime - Dependencies
6. Running containers Pulling - Isolation - Monitoring
7. From docker pre-release To today “stability”
8. Docker v1.0 Stable? HUGE hype Nasty bugs not fixed
9. Behind Docker, the OS
10. Swing of kernels 3.3 3.6 3.13 4.0 4.8?
11. Swing of File Systems Docker Storage Backend AUFS, Devicemapper, BTRFS, OverlayFS, ZFS
12. Monitoring Monitoring 10 containers: $ docker stats <container ids> Monitoring 100s of containers? Scalingo/acadock-monitoring
13. Upgrading Docker Quick release cycle: /3months → MAJOR release ±/month → minor release
14. Upgrading Docker (since 1.12.x) RESTART with containers: OK With a lots of buts... $ docker daemon --live-restore
15. You HAVE to stop all containers, period. Deal with it. Upgrading Docker (before 1.12.x)
16. Quotas and limits in containers
17. Ulimits Common to ALL containers $ docker run --user john --ulimit nproc:1024 error: resource temporarily unavailable Solution: 1 user/container or user namespace
18. Disk quotas What’s your FS backend? $ docker daemon --storage-opt dm.basesize=1G $ docker daemon --storage-opt btrfs.min_size=1G ... $ docker run --storage-opt size=2G Different flags/rules
19. Today state – Good parts
20. Good part: Culture Containers are everywhere
21. Good part: Tooling A growing ecosystem
22. Good part: HTTP API Clients in any language Fine grained container configuration
23. Architecture improvement
24. Good part: Images and registry Distribution of apps
25. Thank you Questions about running Docker in production? Léo Unbekandt @Soulou CTO, Scalingo