Introduction to Consul - Speaker Deck

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Introduction to Consul

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I’m Armon Dadgar @armon

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HashiCorp A DevOps tools company

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SOA Primer • Service Oriented Architecture • Autonomous • Limited Scope • Loose Coupling • e.g. opposite of classic monolith

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Web App Forecasting Order Processing Order History

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Web App Order Processing Discovery Which nodes are part of “Order Processing”?

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Web App Order Processing Node 1 Node N … Load Balancing How to ensure request leveling across providers?

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Web App Order Processing Node 1 Node N … Load Balancer Anti-Pattern! Load Balancer is a Single Point of Failure (SPOF)

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Web App Order Processing Node 1 Node N … Health Checking How to avoid routing to unhealthy hosts?

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Web App Web App Web App Maintenance = true EnableFeature = false Configuration How to efficiently push dynamic configuration?

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Recap • Service Discovery • Load Balancing • Health Checking • Conﬁguration

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Problems? Check.

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Solutions? Nope.

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Solutions* • ZooKeeper, etcd, doozerd • Nagios, Sensu • SkyDNS • SmartStack Consul Comparisons: http://www.consul.io/intro/vs/index.html

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Build it yourself!

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First Pass: Serf • Node membership • Failure Detection • Custom Events • Tag Meta Data • http://serfdom.io

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Serf Shortcomings • 1 Node : 1 Service • 1 : N possible with tag overloading • Liveness check only • Fully decentralized • Joy to operate • Difﬁcult to extend • Eventually Consistent Only

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Learning • 1 Node : N Services • Host checks + Service Checks • Simpler interfaces (Serf only MsgPack/TCP) • Strong Consistency • Multi Datacenter (Serf WAN not optimal)

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Consul

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Service Discovery HTTP + DNS Datacenter Aware (Ritualistic sacriﬁce not required) K/V Store HTTP API Host & Service Level Health Checks

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It Just Works.

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Consul Today • Powers Vagrant Cloud • Used in our on-premise product • Version 0.1 Released • Version 0.2 Next Week • Web UI

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Consul Tomorrow • Partner Deploys • Version 0.3+ • Leader Election • Clients • CLI tools

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Thanks! http://consul.io