Varnish High Availability
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Varnish High Availability
- 1. 1
- 3. backend varnish Varnish is a proxy server clientclientsclients Availability: 1x Cache capacity: 1x Backend load: 1x 3
- 4. client backend clients varnish Problem: How to increase availability, capacity and reduce backend load? X clients Availability: + Cache capacity: + Backend load: - 4
- 5. varnish varnish backend varnish varnish clientclientsclients Increase availability: Round-robin 5
- 8. varnish varnish backend client varnish varnish varnish GET /foo Availability: 4x Cache capacity: 1x Backend load: 4x X 8
- 9. /bar varnish varnish backend client varnish varnish varnish GET /bar /foo Availability: 1x Cache capacity: 4x Backend pressure: 1x Increase capacity: Shard /baz /qux 9
- 10. varnish varnish backend client varnish varnish varnish Availability: 2x Cache capacity: 2x Backend load: 2x Combine Round- Robin and Shard GET /foo /foo /bar 10
- 11. varnish varnish backend client varnish varnish varnish Availability: 2x Cache capacity: 2x Backend load: 2x Combine Round- Robin and Shard GET /foo /foo /bar ? ? 11
- 12. Varnish High Availability Varnish Plus Cache replicator Small and external daemon Asynchronous Easy configuration Simple architecture 12
- 21. Cautious optimism: “Can we have a demo?” 21
- 22. varnish varnish backend client varnish varnish Availability: 3x Cache capacity: 1x Backend load: 1x Demo setup GET /foo-{0..999} varnish varnish backend Availability: 3x Cache capacity: 1x Backend load: 3x 22
- 23. varnish varnish backend client varnish varnish varnish Availability: 2x Cache capacity: 2x Backend load: 1x 23
- 24. varnish varnish backend client varnish varnish varnish varnish varnishvarnish varnish Availability: 2x Cache capacity: 4x Backend load: 1x 24
- 25. varnish varnish backend client varnish varnish varnish varnish varnishvarnish varnish varnish varnishvarnish varnish Availability: 3x Cache capacity: 4x Backend load: 1x 25
- 26. Worth noting Works with any number of nodes Replication requests carry the origin IP HTTPS support ESI support Freshness revalidation Clustering support 26
- 27. Roadmap Support for POST requests Add custom headers to replicate requests Automatic nodes.conf updates Fine-grained control on replications VHA as VMOD 27
- 28. varnish varnish backend client varnish varnish Availability: 3x Cache capacity: 1x Backend load: 1x Questions? GET /foo-{0..999} varnish varnish backend Availability: 3x Cache capacity: 1x Backend load: 3x 28