CoreOS: Control Your Fleet
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A quick introduction into CoreOS.
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CoreOS: Control Your Fleet
- 3. Docker LXC made easy Public repository Easy to share WYSIWY(M)G™
- 4. etcd Key value store, written in go Configuration and service discovery Simple API RAFT Protocol (distributed consensus) Nice extras: ttl, locks
- 5. Fleet Uses systemd Extra conditionals Runs on etcd
- 6. Cloudinit Subset of cloud-config CoreOS specific parameters OS agnostic
- 7. Demo
- 8. Demoish
- 9. Fetch a discovery URL
- 12. $ curl https://discovery.etcd.io/new https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788 $ curl https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788
- 13. $ curl https://discovery.etcd.io/new https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788 $ curl https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788 {"action":"get","node":{"key":" /_etcd/registry/cce83b966a3947533bc9e9a00b0c8788","dir":true," modifiedIndex":5285489,"createdIndex":5285489}
- 14. Let’s create our cloud-init
- 15. #cloud-config coreos: etcd: discovery: https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788 addr: $private_ipv4:4001 peer-addr: $private_ipv4:7001 units: - name: etcd.service command: start - name: fleet.service command: start users: - name: core coreos-ssh-import-github: geekle write_files:
- 16. #cloud-config coreos: etcd: discovery: https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788 addr: $private_ipv4:4001 peer-addr: $private_ipv4:7001 units: - name: etcd.service command: start - name: fleet.service command: start users: - name: core coreos-ssh-import-github: geekle write_files:
- 17. #cloud-config coreos: etcd: discovery: https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788 addr: $private_ipv4:4001 peer-addr: $private_ipv4:7001 units: - name: etcd.service command: start - name: fleet.service command: start users: - name: core coreos-ssh-import-github: geekle write_files:
- 18. coreos: etcd: discovery: https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788 addr: $private_ipv4:4001 peer-addr: $private_ipv4:7001 units: - name: etcd.service command: start - name: fleet.service command: start users: - name: core coreos-ssh-import-github: geekle write_files: - path: /etc/fleet/fleet.conf
- 19. etcd: discovery: https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788 addr: $private_ipv4:4001 peer-addr: $private_ipv4:7001 units: - name: etcd.service command: start - name: fleet.service command: start users: - name: core coreos-ssh-import-github: geekle write_files: - path: /etc/fleet/fleet.conf content: |
- 20. discovery: https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788 addr: $private_ipv4:4001 peer-addr: $private_ipv4:7001 units: - name: etcd.service command: start - name: fleet.service command: start users: - name: core coreos-ssh-import-github: geekle write_files: - path: /etc/fleet/fleet.conf content: | public_ip="$private_ipv4"
- 21. addr: $private_ipv4:4001 peer-addr: $private_ipv4:7001 units: - name: etcd.service command: start - name: fleet.service command: start users: - name: core coreos-ssh-import-github: geekle write_files: - path: /etc/fleet/fleet.conf content: | public_ip="$private_ipv4" metadata="elastic_ip=true,public_ip=$public_ipv4"
- 22. peer-addr: $private_ipv4:7001 units: - name: etcd.service command: start - name: fleet.service command: start users: - name: core coreos-ssh-import-github: geekle write_files: - path: /etc/fleet/fleet.conf content: | public_ip="$private_ipv4" metadata="elastic_ip=true,public_ip=$public_ipv4"
- 23. units: - name: etcd.service command: start - name: fleet.service command: start users: - name: core coreos-ssh-import-github: geekle write_files: - path: /etc/fleet/fleet.conf content: | public_ip="$private_ipv4" metadata="elastic_ip=true,public_ip=$public_ipv4"
- 24. units: - name: etcd.service command: start - name: fleet.service command: start users: - name: core coreos-ssh-import-github: geekle write_files: - path: /etc/fleet/fleet.conf content: | public_ip="$private_ipv4" metadata="elastic_ip=true,public_ip=$public_ipv4"
- 25. units: - name: etcd.service command: start - name: fleet.service command: start users: - name: core coreos-ssh-import-github: geekle write_files: - path: /etc/fleet/fleet.conf content: | public_ip="$private_ipv4" metadata="elastic_ip=true,public_ip=$public_ipv4"
- 26. units: - name: etcd.service command: start - name: fleet.service command: start users: - name: core coreos-ssh-import-github: geekle write_files: - path: /etc/fleet/fleet.conf content: | public_ip="$private_ipv4" metadata="elastic_ip=true,public_ip=$public_ipv4"
- 27. Boot with your favorite Paas
- 28. $ curl https://discovery.etcd.io/new https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788 $ curl https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788 {"action":"get","node":{"key":" /_etcd/registry/cce83b966a3947533bc9e9a00b0c8788","dir":true," modifiedIndex":5285489,"createdIndex":5285489}
- 29. $ curl https://discovery.etcd.io/new https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788 $ curl https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788 {"action":"get","node":{"key":" /_etcd/registry/cce83b966a3947533bc9e9a00b0c8788","dir":true," modifiedIndex":5285489,"createdIndex":5285489} $ curl https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788
- 30. $ curl https://discovery.etcd.io/new https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788 $ curl https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788 {"action":"get","node":{"key":" /_etcd/registry/cce83b966a3947533bc9e9a00b0c8788","dir":true," modifiedIndex":5285489,"createdIndex":5285489} $ curl https://discovery.etcd.io/cce83b966a3947533bc9e9a00b0c8788 {"action":"get","node":{"key":" /_etcd/registry/cce83b966a3947533bc9e9a00b0c8788","dir":true,"nodes": [{"key":" /_etcd/registry/cce83b966a3947533bc9e9a00b0c8788/24bb98332c044a1287e937c216 f5d27a","value":"http://10.0.1.50:7001","expiration":"2014-04-14T11:40: 57.102816593Z","ttl":604576,"modifiedIndex":5288689,"createdIndex": 5288689},{"key":" /_etcd/registry/cce83b966a3947533bc9e9a00b0c8788/cf321c2c8dbc46d99236fd4a28 84e353","value":"http://10.0.0.114:7001","expiration":"2014-04-14T11:44: 07.598817138Z","ttl":604766,"modifiedIndex":5289124,"createdIndex": 5289124},{"key":"
- 31. Let’s login
- 32. $ ssh -A core@54.206.85.138
- 33. $ ssh -A core@54.206.85.138 ______ ____ _____ / ____/___ ________ / __ / ___/ / / / __ / ___/ _ / / / /__ / /___/ /_/ / / / __/ /_/ /___/ / ____/____/_/ ___/____//____/ core@ip-10-0-0-114 ~ $
- 34. $ ssh -A core@54.206.85.138 ______ ____ _____ / ____/___ ________ / __ / ___/ / / / __ / ___/ _ / / / /__ / /___/ /_/ / / / __/ /_/ /___/ / ____/____/_/ ___/____//____/ core@ip-10-0-0-114 ~ $ fleetctl list-machines
- 35. $ ssh -A core@54.206.85.138 ______ ____ _____ / ____/___ ________ / __ / ___/ / / / __ / ___/ _ / / / /__ / /___/ /_/ / / / __/ /_/ /___/ / ____/____/_/ ___/____//____/ core@ip-10-0-0-114 ~ $ fleetctl list-machines MACHINE IP METADATA 12206e61... 10.0.1.50 elastic_ip=false bd57c96a... 10.0.0.114 elastic_ip=true, public_ip=54.206.85.138 37e5ec47... 10.0.0.231 elastic_ip=true, public_ip=54.206.52.131 core@ip-10-0-0-114 ~ $
- 36. $ ssh -A core@54.206.85.138 ______ ____ _____ / ____/___ ________ / __ / ___/ / / / __ / ___/ _ / / / /__ / /___/ /_/ / / / __/ /_/ /___/ / ____/____/_/ ___/____//____/ core@ip-10-0-0-114 ~ $ fleetctl list-machines MACHINE IP METADATA 12206e61... 10.0.1.50 elastic_ip=false bd57c96a... 10.0.0.114 elastic_ip=true, public_ip=54.206.85.138 37e5ec47... 10.0.0.231 elastic_ip=true, public_ip=54.206.52.131 core@ip-10-0-0-114 ~ $ echo "o/"
- 37. $ ssh -A core@54.206.85.138 ______ ____ _____ / ____/___ ________ / __ / ___/ / / / __ / ___/ _ / / / /__ / /___/ /_/ / / / __/ /_/ /___/ / ____/____/_/ ___/____//____/ core@ip-10-0-0-114 ~ $ fleetctl list-machines MACHINE IP METADATA 12206e61... 10.0.1.50 elastic_ip=false bd57c96a... 10.0.0.114 elastic_ip=true, public_ip=54.206.85.138 37e5ec47... 10.0.0.231 elastic_ip=true, public_ip=54.206.52.131 core@ip-10-0-0-114 ~ $ echo "o/" o/
- 39. $ fleetctl --tunnel '54.206.85.138' list-machines
- 40. $ fleetctl --tunnel '54.206.85.138' list-machines MACHINE IP METADATA f7898d12... 10.0.1.50 elastic_ip=false ca1355b0... 10.0.0.231 elastic_ip=true, public_ip=54.206.52.131 40e69aa8... 10.0.0.114 elastic_ip=true, public_ip=54.206.85.138
- 41. $ fleetctl --tunnel '54.206.85.138' list-machines MACHINE IP METADATA f7898d12... 10.0.1.50 elastic_ip=false ca1355b0... 10.0.0.231 elastic_ip=true, public_ip=54.206.52.131 40e69aa8... 10.0.0.114 elastic_ip=true, public_ip=54.206.85.138
- 42. $ fleetctl --tunnel '54.206.85.138' list-machines MACHINE IP METADATA f7898d12... 10.0.1.50 elastic_ip=false ca1355b0... 10.0.0.231 elastic_ip=true, public_ip=54.206.52.131 40e69aa8... 10.0.0.114 elastic_ip=true, public_ip=54.206.85.138 $ fleetctl --tunnel '54.206.85.138' ssh f7898d12
- 43. $ fleetctl --tunnel '54.206.85.138' list-machines MACHINE IP METADATA f7898d12... 10.0.1.50 elastic_ip=false ca1355b0... 10.0.0.231 elastic_ip=true, public_ip=54.206.52.131 40e69aa8... 10.0.0.114 elastic_ip=true, public_ip=54.206.85.138 $ fleetctl --tunnel '54.206.85.138' ssh f7898d12 ______ ____ _____ / ____/___ ________ / __ / ___/ / / / __ / ___/ _ / / / /__ / /___/ /_/ / / / __/ /_/ /___/ / ____/____/_/ ___/____//____/ core@ip-10-0-1-50 ~ $
- 44. Let’s create some services
- 45. [Unit] Description=HAProxy Service [Service] ExecStart=/usr/bin/docker run --rm --name %n -p 80:80 -p 443:443 -p 8080:8080 redguava/haproxy-etcd ExecStop=/usr/bin/docker stop %n
- 46. [Unit] Description=Apache Service [Service] ExecStart=/usr/bin/docker run --rm --name %n -p 80 thomaswelton/apache ExecStop=/usr/bin/docker stop %n [X-Fleet] X-Conflicts=haproxy.service
- 47. [Unit] Description=Apache Announce BindsTo=apache.service [Service] ExecStart=/bin/bash -c "HOST_IP=$(/bin/ifconfig eth0 | awk '/inet /{print $2}') && CONTAINER_PORT=$(docker inspect apache.service | grep -m 1 HostPort | tr -d ' ' | cut -d: -f2 | tr -d '"') && while true; do etcdctl set /services/web/%H "{ "host": "$HOST_IP", "port": "$CONTAINER_PORT" }" --ttl 60;sleep 45;done" ExecStop=/usr/bin/etcdctl rm /services/web/%H [X-Fleet] X-ConditionMachineOf=apache.service
- 48. Let’s add the services
- 49. $ fleetctl --tunnel '54.206.85.138' submit *.service $ fleetctl --tunnel '54.206.85.138' list-units UNIT LOAD ACTIVE SUB DESC MACHINE apache-announce.service - - - Apache Announce - apache.service - - - Apache Service - haproxy.service - - - HAProxy Service -
- 50. $ fleetctl --tunnel '54.206.85.138' start --require 'elastic_ip=true' haproxy.service $ fleetctl --tunnel '54.206.85.138' list-units UNIT LOAD ACTIVE SUB DESC MACHINE apache-announce.service - - - Apache Announce - apache.service - - - Apache Service - haproxy.service loaded active running HAProxy Service ca1355b0... /10.0.0.231
- 51. $ fleetctl --tunnel '54.206.85.138' start apache*.service $ fleetctl --tunnel '54.206.85.138' list-units UNIT LOAD ACTIVE SUB DESC MACHINE apache-announce.service loaded active running Apache Announce f7898d12.../10.0.1.50 apache.service loaded active running Apache Service f7898d12... /10.0.1.50 haproxy.service loaded active running HAProxy Service ca1355b0... /10.0.0.231
- 52. core@ip-10-0-1-50 ~ $ etcdctl ls --recursive /services /services/web /services/web/ip-10-0-1-50 core@ip-10-0-1-50 ~ $ etcdctl get /services/web/ip-10-0-1-50 { "host": "10.0.1.50", "port": "49154" }
- 55. Things You Should Know - discovery.etcd.io has a 1 week TTL - It is in alpha. Beta on the way. - Automatic restarts after updates during the alpha. You can disable this.