CoreOS Overview @ LinuxCon US 2014

Transcript

2. About Me CTO/CO-FOUNDER systems engineer @brandonphilips github.com/philips
3. What is CoreOS?
4. What is CoreOS?
7. Why build CoreOS?
8. reduce API contracts minimal
9. kernel systemd etcd ssh docker python java nginx mysql openssl app distro distro distro distro distro distro distr
10. python java nginx mysql openssl app distro distro distro distro distro distro distr kernel systemd etcd ssh docker
11. python openssl-A app1 distro distro distro distro distro distro distr java openssl-B app2 java openssl-B app3 kernel systemd etcd ssh docker
12. CoreOS python openssl-A app1 distro distro distro distro distro distro distr java openssl-B app2 java openssl-B app3
13. CoreOS container distro distro distro distro distro distro distr container container
14. manual updates
15. automatic updates
16. automatic updates
17. atomic with rollback auto updates
21. run and isolate apps containers
22. pid ns isolated pid 1
23. user ns isolated uid 0
24. network ns isolated netdev
25. mount ns isolated /
26. cgroups manage resources
27. cgroups count resources
29. cgroups limit resources
30. docker engine
32. machines and clusters configuration
33. get into the cluster machine conf
34. #cloud-config users: - name: core coreos-ssh-import-github: philips coreos: etcd: discovery: https://discovery.etcd.io/ba09c units: - name: etcd.service command: start - name: fleet.service command: start
35. #cloud-config users: - name: core coreos-ssh-import-github: philips coreos: etcd: discovery: https://discovery.etcd.io/ba09c units: - name: etcd.service command: start - name: fleet.service command: start
36. #cloud-config users: - name: core coreos-ssh-import-github: philips coreos: etcd: discovery: https://discovery.etcd.io/ba09c units: - name: etcd.service command: start - name: fleet.service command: start
37. #cloud-config users: - name: core coreos-ssh-import-github: philips coreos: etcd: discovery: https://discovery.etcd.io/ba09c units: - name: etcd.service command: start - name: fleet.service command: start
38. what is running cluster conf
39. skydns, discoverd, confd services
40. what should run cluster conf
41. locksmith coordination
42. fleet, kubernetes scheduling
43. etcd
44. /etc distributed
45. open source software highly available and reliable sequentially consistent watchable exposed via HTTP runtime reconfigurable
46. -X GET Get Wait -X PUT Put Create CAS -X DELETE Delete CAD
47. Available
48. Available
49. Available
50. Unavailable
51. Available Leader Follower
52. Leader Follower Available
53. Leader Follower Temporarily Unavailable
54. Leader Follower Available
55. Sequential Consistency Index Time
56. 1 1 1 2 GET A @ index 2 -> blocking GET A @ index 2 -> 2 2
57. 1 1 1 2 GET A @ index 2 -> 2 2 2
58. etcd guarantees that a get at index X will always return the same result. Avoid thinking in terms of real time because with network latency the result is always out-of-date.
59. Watchable Changes HTTP Long-poll
60. 1 2 3 > GET asdf?waitIndex=4&wait=true HTTP/1.1 > Accept: */* > < HTTP/1.1 200 OK < Content-Type: application/json < X-Etcd-Index: 3 < X-Raft-Index: 97 < X-Raft-Term: 0 < BLOCK
61. 1 2 3 4 > GET asdf?waitIndex=4&wait=true HTTP/1.1 > Accept: */* > < HTTP/1.1 200 OK < Content-Type: application/json < X-Etcd-Index: 3 < X-Raft-Index: 97 < X-Raft-Term: 0 < {"action":"set","node":{"key":"/asdf","value":"foobar"," modifiedIndex":4,"createdIndex":4}}
62. 1 2 3 4 > GET asdf?waitIndex=4&wait=true HTTP/1.1 > Accept: */* > < HTTP/1.1 200 OK < Content-Type: application/json < X-Etcd-Index: 4 < X-Raft-Index: 516 < X-Raft-Term: 0 < {"action":"set","node":{"key":"/asdf","value":"foobar"," modifiedIndex":4,"createdIndex":4}}
63. getting work to servers scheduling
64. You Scheduler API Scheduler Machine(s)
65. $ cat foo.service [Service] ExecStart=/usr/bin/sleep 500 $ fleetctl start foo.service Job foo.service launched on e1cd2bcd.../172.17.8.101
66. while true { todo = diff(desState, curState) schedule(todo) }
67. while true { todo = diff(desState, curState) schedule(todo) }
68. while true { todo = diff(desState, curState) schedule(todo) }
69. while true { todo = diff(desState, curState) schedule(todo) }
70. Talk tomorrow! fleet: systemd for clusters 2:30pm Mississippi
71. Why use CoreOS?
72. is it ready? stable released
73. lots of work todo the future
75. DEMO?