Consul First Steps
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This talk will guide you through the first steps to understand Consul and do some cool stuff with it. You also have a live Vagrant demo available in github at https://github.com/lynxman/consul-first-steps
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Consul First Steps
- 2. Who am I? Marc Cluet (@lynxman) Grumpy Engineer based in London Co-‐Founder of Ukon Cherry Head of Operations at Gluru 17 years of experience as a SysAdmin Founding member of Juju and MAAS while at Canonical Built a DevOps Engineering Team at Rackspace Been DevOps’in for the last 5 years
- 5. What is Consul? It’s a Service Discovery System
- 6. What is Service Discovery? Service Node A Service Publication Service Node B Service Node C
- 7. What is Service Discovery? Service Node A Health Check Discovery Agent Discovery Agent Service Node B Health Check Service Publication Node A Node B
- 8. Consul Architecture Client Consul Server Consul Server Consul Server Client Client Client Consul Server
- 9. Consul Architecture Client Consul Server Consul Server Consul Server Client Client Client Consul Server WAN Gossip LAN Gossip
- 10. Bender Approved
- 12. Consul functionality It’s a service discovery system • Publishes DNS • k/v Storage • Service Publication • Health Checks • HTTP RESTful API • With Encryption!
- 13. Consul DNS publisher Port 8600 Use dnsmasq: server=/consul/127.0.0.1#8600
- 14. Consul DNS publisher service name: web zone: eu-‐west-‐1 <servicename>.service.<zone>.consul web.service.eu-‐west-‐1.consul
- 15. Consul DNS publisher node name: web01 zone: eu-‐west-‐1 <nodename>.<zone>.consul web01.eu-‐west-‐1.consul
- 16. Consul DNS publisher API FRIENDLY! /v1/catalog/ /v1/catalog/datacenters/ /v1/catalog/nodes/ /v1/catalog/services/<servicename> /v1/catalog/service/<name> /v1/catalog/node/<nodename>
- 17. k/v Storage /v1/kv/<key> GET PUT DELETE Limited to 256kb https://www.flickr.com/photos/victoriabernal/6294851265
- 18. Service Publication { "service": { "name": ”web", "tags": [”my web"], "port": 80, "check": { "script": "/usr/lib/nagios/check_http", "interval": "10s" } } }
- 19. Service Publication Service Node A Service Node B Service Node C web.service.eu-‐west-‐1.consul 10.10.10.10 10.10.10.11 10.10.10.12
- 20. Service Publication Service Node A Service Node B Service Node C web.service.eu-‐west-‐1.consul 10.10.10.10 10.10.10.11 10.10.10.12
- 21. Service Publication Service Node A Service Node B Service Node C web.service.eu-‐west-‐1.consul 10.10.10.10 10.10.10.11 10.10.10.12
- 22. Service Publication Caveats • Can remove ALL servers • Check needs to be solid
- 23. Health Checks { "check": { "id": "mem-‐util", "name": "Memory utilization", "script": "/usr/local/bin/check_mem.py", "interval": "10s" } }
- 24. Health Checks Caveats • Can remove the server and all services • Check needs to be solid
- 26. HTTP RESTful API /v1/kv/ /v1/agent/ /v1/catalog/ /v1/health/ /v1/session/ /v1/acl/ /v1/status/
- 27. Encryption Separate encryption for different traffic • Gossip Encryption • RPC TLS Encryption https://www.flickr.com/photos/ideonexus/5175383269
- 28. Gossip Encryption KPI Encryption $ consul keygen cg8StVXbQJ0gPvMd9o7yrg==
- 30. Special Mention consul watch -‐type [ key [params] script event services nodes checks ]
- 31. Special Mention API Blocking Queries
- 33. Config Mgmt Puppet https://forge.puppetlabs.com/KyleAnderson/consul https://forge.puppetlabs.com/lynxman/hiera_consul Chef https://supermarket.chef.io/cookbooks/consul
- 34. Config Mgmt Ansible https://galaxy.ansible.com/list#/roles/2032 https://galaxy.ansible.com/list#/roles/1453 SaltStack ???
- 35. Hashicorp Tools EnvConsul https://github.com/hashicorp/envconsul Consul Replicate https://github.com/hashicorp/consul-‐replicate Consul Template https://github.com/hashicorp/consul-‐template
- 36. Consul Ecosystem Confd Consulate Crypt Docker Consul Registrator More at http://www.consul.io/downloads_tools.html https://www.flickr.com/photos/tjflex/7646164470
- 38. Useful Links Consul Documentation http://www.consul.io/docs/index.html Consul Mailing List https://groups.google.com/forum/#!forum/consul-‐tool Consul Open Issues https://github.com/hashicorp/consul/issues