CoreOS @Codetalks Hamburg
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This document introduces CoreOS, an open source operating system focused on automation, security, and scalability. It provides automatic updates, uses Docker containers, and includes tools like Etcd for service discovery and configuration. CoreOS is based on Gentoo Linux and uses systemd. It focuses on immutable infrastructure with atomic updates and rollbacks. The document describes CoreOS tools like Etcd, Locksmith, Cloud Config, Flannel and Fleet for cluster management.
![Discovery API
$> curl https://discovery.etcd.io/new
https://discovery.etcd.
io/463c1435f9f63c952e0899b1f459c0fe
$> curl -s https://discovery.etcd.
io/463c1435f9f63c952e0899b1f459c0fe | jq ".node.
nodes[].value"
"http://172.31.19.1:7001"
"http://172.31.19.0:7001"
"http://172.31.18.255:7001"](https://image.slidesharecdn.com/coreoscodetalks-141017053402-conversion-gate02/85/CoreOS-Codetalks-Hamburg-13-320.jpg)
![Unit file
[Unit]
Description=A Redis Server
[Service]
TimeoutStartSec=0
ExecStartPre=/usr/bin/docker pull teemow/redis
ExecStart=/usr/bin/docker run --rm -p 6379 --name %n
teemow/redis
ExecStop=/usr/bin/docker stop %n](https://image.slidesharecdn.com/coreoscodetalks-141017053402-conversion-gate02/85/CoreOS-Codetalks-Hamburg-28-320.jpg)
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CoreOS @Codetalks Hamburg
- 1. Introduction to CoreOS Timo Derstappen @teemow
- 2. Simple service orchestration, built for developers. Based in Cologne, Germany. Ten terrific folks, and hiring! http://giantswarm.io/
- 4. Minimal Linux CoreOS enables warehouse-scale computing on top of a minimal, modern operating system. A new Linux Distribution to provide features needed to run modern infrastructure stacks.
- 5. Features ● Automatic Updates ● Docker Containers ● Cluster management ● Service Discovery
- 6. Linux Basis ● Based on Gentoo ● systemd ● btrfs ● Images for PXE, OpenStack, AWS, GCE, Vagrant
- 7. “Immutable” System ● Read-only rootfs ● Writeable overlay on /etc
- 8. No classic package manager ● ChromeOS inspired update engine ● Atomic Updates ● Rollbacks ● Using Docker to distribute software
- 9. CoreOS own tools ● Etcd ● Locksmith ● Cloud-config ● Flannel ● Fleet https://github.com/coreos
- 10. Etcd A highly-available key value store for shared configuration and service discovery.
- 11. Etcd ● Basis for > Configuration management > Service Discovery ● REST Interface ● Raft consensus algorithm http://raftconsensus.github.io/
- 12. Etcd Cluster
- 13. Discovery API $> curl https://discovery.etcd.io/new https://discovery.etcd. io/463c1435f9f63c952e0899b1f459c0fe $> curl -s https://discovery.etcd. io/463c1435f9f63c952e0899b1f459c0fe | jq ".node. nodes[].value" "http://172.31.19.1:7001" "http://172.31.19.0:7001" "http://172.31.18.255:7001"
- 14. Locksmith Reboot manager for the CoreOS update engine.
- 15. Locksmith ● Reboot strategies for CoreOS updates ● Uses etcd for distributed locks ● Alpha, Beta, Stable channels
- 16. Cloud Config Customize a CoreOS machine through user-data.
- 17. Cloud Config ● Initialization of your instances ● Configure etcd, fleet, locksmith ● YAML file ● eg. EC2 user-data, Autoscaler launch-config
- 18. Configure your cluster #cloud-config coreos: update: reboot-strategy: etcd-lock
- 19. Configure your cluster #cloud-config coreos: update: reboot-strategy: etcd-lock etcd: discovery: https://discovery.etcd.io/<token>
- 20. Configure your cluster #cloud-config coreos: update: reboot-strategy: etcd-lock etcd: discovery: https://discovery.etcd.io/<token> users: - name: teemow coreos-ssh-import-github: teemow
- 21. Flannel Overlay networks backed by etcd.
- 22. Cloud overlay network ● One subnet per machine ● Get rid of docker port mapping ● Let containers talk to each other via IP addresses
- 23. Backends ● Encapsulate packets in UDP ● VXLAN implementation coming
- 24. Fleet Systemd for the cluster
- 25. Fleet ● CLI and API to start your containers ● Uses etcd and systemd
- 26. Fleet deployment
- 27. Fleet Scheduler ● Relatively simple > By meta data > Same machine/exclusion ● Resolve service dependencies! ● More to come > Resource management (CPU, memory etc.)
- 28. Unit file [Unit] Description=A Redis Server [Service] TimeoutStartSec=0 ExecStartPre=/usr/bin/docker pull teemow/redis ExecStart=/usr/bin/docker run --rm -p 6379 --name %n teemow/redis ExecStop=/usr/bin/docker stop %n
- 29. Manage a service $> fleetctl start redis.service $> fleetctl list-units $> fleetctl status redis.service $> fleetctl journal redis.service $> fleetctl stop redis.service $> fleetctl destroy redis.service
- 31. Three-Tier Application ● Load Balancer ● App ● Database
- 32. Sidekick Keep configuration out of your app
- 33. Ambassador Reverse proxy for your service Keep service discovery out of your app
- 34. Using CoreOS
- 35. CoreOS ● Great foundation to create flexible distributed infrastructures ● Unix philosophy
- 36. Kubernetes ● Google Container Orchestration ● Runs on top of CoreOS
- 37. cAdvisor ● Monitoring for your containers ● Collects, aggregates and processes metrics ● InfluxDB Backend ● Monitoring of clusters with Heapster
- 38. Deis Heroku-like Open Source PaaS
- 39. Panamax ● Web interface to start multi container apps ● App Templates on Github ● Open Source project from CenturyLink Labs
- 40. We ♥ CoreOS
- 41. There is a Meetup in Cologne Docker Cologne - CoreOS Meetup 19:00, 14th October Startplatz Brandon Philips, CTO of CoreOS Luke Marsden, CTO of Flocker
- 42. Sign up for the Giant Swarm private Beta Request Invite http://giantswarm.io/
- 43. Thanks for listening! Reach out: Timo Derstappen @teemow @giantswarm