CoreOS 101 - EMC World 2015
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CoreOS is a Linux distribution designed for running highly available containerized systems. It uses Docker containers and systemd for service management. Etcd is a key-value store used for service discovery and configuration sharing across the cluster. Fleet is a tool for deploying and distributing Docker containers across a CoreOS cluster using etcd for service registration and discovery.
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- 1. CoreOS 101 Jonas Rosland Developer Advocate @jonasrosland [email protected] emccode.github.io EMC World 2015
- 2. Basics of a container
- 6. CoreOS Based on Gentoo Kernel + Containers, nothing else Built for running HA environments Updates applied automatically
- 7. Containers Docker, of course, but also others like LXC and nspawn Isolation from other applications Link containers together Less overhead than VMs Released container runtime engine Rocket recently
- 8. systemd System management daemon Services, timers and one-off jobs Logging through journal
- 9. etcd Highly available Key-Value database store Provides service discovery and shared configurations Others like it are Consul and Zookeeper Provides a locking mechanism for safe(r) automatic updates Public etcd service: https://discovery.etcd.io/ This is frickin awesome, as you'll see :)
- 10. etcdctl command $ set services/db1 10.0.0.101 $ set services/db2 10.0.0.102 $ set services/db-master db1 $ get services/db-master "db1" $ get services/db1 "10.0.0.101"
- 13. fleet Deploy docker containers on arbitrary hosts in a cluster Distribute services across a cluster using machine-level anti- affinity Maintain N instances of a service Re-scheduling on machine failure Discover machines running in the cluster
- 14. fleet
- 15. Putting it all together 1. Create a systemd file for your service 2. Start the service using fleet 3. Register services in etcd 4. ... 5. Profit!
- 16. Demotime!