How Galera (Synchronous replication plugin for Percona XtraDB Cluster) can be used with Docker (or linux containers in general) to 'mesh' well. Video of the talk: https://www.youtube.com/watch?v=3A8EF549Q3Y&list=PLctlsn9Gs8wbx47tuhxuNytdrsDf_LWI2&index=2 Playlist: http://www.youtube.com/playlist?list=PLctlsn9Gs8wbx47tuhxuNytdrsDf_LWI2

1. Galera with Docker
How Synchronous Replication and Linux
Containers mesh together
Linux.conf.au 2015
Raghavendra Prabhu
 raghavendra.d.prabhu@gmail.com
Percona  raghavendra.prabhu@percona.com
 randomsurfer  wnohang.net  rdprabhu  ronin13

2. Galera

3. Introduction
Galera
▶ Data-centric approach
▶ EVS
▶ Causality and Synchronous
▶ Latency
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 3 / 27

4. Containers!

5. Introduction
Containers
▶ Linux namespaces
♦ PID
♦ Network
♦ Mount
♦ User
▶ Cgroups
♦ Metrics
♦ Good fences make good neighbors!
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 5 / 27

6. Introduction
Containers
▶ Manipulation
♦ nsenter/setns
♦ unshare
♦ clone
▶ CRIU
- Migration and High Availability
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 6 / 27

7. The uptime whale!

8. Introduction
Docker
▶ Layers
▶ Volumes
▶ Storage
♦ Btrfs
♦ Device mapper
♦ Union mounts - OverlayFS
▶ Dockerfile and determinism
▶ Simplified networking
♦ Batteries included!
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 8 / 27

9. Symmetry in replication and
deployment

10. Introduction
Together
▶ Elastic requirements
▶ Fast scalability
▶ Packing for saturation
♦ Strategies/Filters/Metadata
♦ KSM
▶ Snapshot Transfer and COW
▶ Runtime instantiation
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 10 / 27

11. Introduction
Together :: Images
▶ Build and start
♦ Minimal
♦ Inheritance
♦ Extensibility
♦ Immutability
♦ Registry: go get!
▶ Minimal Assumptions
▶ Galera images
♦ http://github.com/percona/pxc-docker
♦ https://hub.docker.com/u/ronin/
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 11 / 27

12. Introduction
Together :: Networking
▶ Linking
▶ Dnsmasq
▶ Weave
▶ libswarm
▶ OVS
▶ Andromeda
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 12 / 27

13. Introduction
Together :: Networking :: Issues
▶ IP address and restart
▶ dhcpcd
▶ Socket interface
▶ Linking
♦ Patterns
▶ Kernel ABI
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 13 / 27

14. Introduction
Together :: Use cases
▶ Testing
- https://github.com/percona/pxc-docker/tree/master/chaos-
galera
▶ Benchmarking
▶ Production Deployment
▶ Rolling Upgrades
▶ Rapid Development
♦ https://github.com/percona/pxc-docker/tree/master/
docker-bld
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 14 / 27

15. Introduction
Together :: Patterns
▶ Systemd and Docker
▶ Packaging testing
▶ Management of process
♦ Supervisor pattern
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 15 / 27

16. Orchestration

17. Introduction
Orchestration
▶ Fig && Docker Compose
♦ Limitations
▶ Mesos and Docker swarm
▶ Flannel and Kubernates
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 17 / 27

18. Container deployment

19. Introduction
Deployment
▶ Amazon EC2
▶ Google Container Engine
▶ Azure
▶ DigitalOcean
▶ Joyent SmartCloud
▶ Virtual Machines
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 19 / 27

20. Who contains the containers?

21. Introduction
Environment
▶ Project Atomic: rpm-ostree
▶ Snappy
▶ CoreOS
▶ Apache Mesos
▶ Docker swarm
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 21 / 27

22. Introduction
Environment :: CoreOS
▶ Systemd integration
▶ etcd - Raft
▶ fleet
▶ Bootstrapping and voting
♦ Queues
♦ Test and Set
♦ TTL and Watch
♦ Sidekicks
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 22 / 27

23. Introduction
Others
▶ lxc/lxd
▶ systemd-nspawn
▶ Rocket
♦ App Container Specification
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 23 / 27

24. What you see is what
you get to attack

25. Introduction
Security
▶ sVirt
▶ seccomp
▶ Visibility: Namespaces
▶ Capabilities / Privileged
▶ Verifiability upto bare-metal
▶ Remote images
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 25 / 27

26. Introduction
About
▶ /me: Raghavendra Prabhu, Product Lead, Percona XtraDB
Cluster, Percona.
▶ Slides will be at slideshare.net/slidunder.
▶ About.me: raghavendra.prabhu
▶ Keybase.io: rdprabhu
▶ Presentation under CC BY-SA 4.0
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 26 / 27

27. Introduction
Image Credits
▶ https://commons.wikimedia.org/wiki/File:
Venice_galley,_rowing_alla_sensile2.jpg
▶ https://commons.wikimedia.org/wiki/File:ShippingContainerSFBay.jpg
▶ https://www.flickr.com/photos/stephanie_in_love/5412368995/
▶ http://en.wikipedia.org/wiki/Orchestra
▶ https://www.google.com/hostednews/getty/article/ALeqM5ht_B847adBMPN2_
8ivClssq937Eg?docId=164893212
▶ http://pixabay.com/en/container-port-hamburg-49538/
▶ https://i.ytimg.com/vi/Q5POuMHxW-0/maxresdefault.jpg
▶ https://upload.wikimedia.org/wikipedia/commons/e/e6/Order-3_heptakis_
heptagonal_tiling.png
Raghavendra Prabhu (Percona) Galera with Docker 12 January, 2015 27 / 27