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CONSUL AS A MONITORING SERVICE

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SETH VARGO @sethvargo

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SERVICE ORIENTED ARCHITECTURE

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SOA  PRIMER Autonomous Limited Scope Loose Coupling

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ORDER PROCESSING WEB APP ORDER HISTORY FORECASTING

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ORDER PROCESSING WEB APP DISCOVERY Which nodes are part of "order processing"?

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ORDER PROCESSING WEB APP LOAD  BALANCING How to ensure request leveling across providers? NODE 1 NODE 2 NODE N

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ORDER PROCESSING WEB APP ANTI-­‐PATTERN Load Balancer is a Single Point of Failure (SPOF) NODE 1 NODE 2 NODE N LOAD BALANCER

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ORDER PROCESSING WEB APP HEALTH  CHECKING How to avoid routing to unhealthy hosts? NODE 1 NODE 2 NODE 3 LOAD BALANCER

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WEB APP CONFIGURATION How to efficiently push dynamic configuration? WEB 1 WEB 2 WEB N maintenance: false feature_a: true role: "web"

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SERVICE   DISCOVERY LOAD   BALANCING HEALTH   CHECKING KEY-­‐VALUE   CONFIGURATION 4  BASIC  PROBLEMS

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ZOOKEEPER ETCD SENSU SMART  STACK EXISTING  "SOLUTIONS" http://consul.io/intro/vs

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CONSUL

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Service Discovery HTTP + DNS

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demo  master dig web-frontend.service.consul

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; <<>> DiG 9.8.3-P1 <<>> web-frontend.service.consul. ANY ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29981 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;web-frontend.service.consul. IN ANY ;; ANSWER SECTION: web-frontend.service.consul. 0 IN A 10.0.3.83 web-frontend.service.consul. 0 IN A 10.0.1.109 demo  master dig web-frontend.service.consul

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Datacenter Aware

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CLIENT CLIENT CLIENT CLIENT CLIENT CLIENT SERVER SERVER SERVER REPLICATION REPLICATION RPC RPC LAN  GOSSIP

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CLIENT CLIENT CLIENT CLIENT CLIENT CLIENT SERVER SERVER SERVER REPLICATION REPLICATION RPC RPC LAN  GOSSIP SERVER SERVER SERVER REPLICATION REPLICATION

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CLIENT CLIENT CLIENT CLIENT CLIENT CLIENT SERVER SERVER SERVER REPLICATION REPLICATION RPC RPC LAN  GOSSIP SERVER SERVER SERVER REPLICATION REPLICATION WAN  GOSSIP

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Host & Service Level Health Checks

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> listen http-in bind *:8000 server web-0 127.0.0.1:80 server web-1 127.0.0.1:80 server web-2 127.0.0.1:80 demo  master consul-template -template="example.ctmpl" -dry demo  master

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> listen http-in bind *:8000 server web-0 127.0.0.1:80 server web-1 127.0.0.1:80 server web-2 127.0.0.1:80 demo  master consul-template -template="example.ctmpl" -dry demo  master sudo stop webserver

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> listen http-in bind *:8000 server web-1 127.0.0.1:80 server web-2 127.0.0.1:80 demo  master consul-template -template="example.ctmpl" -dry demo  master sudo stop webserver

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> listen http-in bind *:8000 server web-0 127.0.0.1:80 server web-1 127.0.0.1:80 server web-2 127.0.0.1:80 demo  master consul-template -template="example.ctmpl" -dry demo  master sudo start webserver

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K/V Store HTTP API

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true demo  master curl -X PUT -d 'bar' http://localhost:8500/v1/kv/foo

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true demo  master curl -X PUT -d 'bar' http://localhost:8500/v1/kv/foo [ { "CreateIndex": 100, "ModifyIndex": 200, "Key": "foo", "Flags": 0, "Value": "YmFy" } ] demo  master curl http://localhost:8500/v1/kv/foo

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TRUSTED  BY

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HEALTH CHECKS

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WHAT  IS  A  CHECK? Any command that returns an exit code

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WHAT  IS  A  CHECK? Any command that returns an exit code 0 PASSING 1 WARNING __ FAILING

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WHAT  IS  A  CHECK? Output is captured as a "note" for inspection curl: (7) Failed to connect to 127.0.0.1 port 4455: Connection refused $ curl http://127.0.0.1:4455/_health

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CREATING  A  CHECK Use a custom script { "check": { "id": "mem-util", "name": "Memory utilization", "script": "/usr/local/bin/check_mem.py", "interval": "10s" } }

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CREATING  A  CHECK Use a built-in check type { "check": { "id": "api", "name": "HTTP API on port 4455", "http": "http://localhost:4455/_health", "interval": "10s", "timeout": "1s" } }

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RESPONSIVE

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MONITORING SERVICE TRADITIONAL  MONITORING Pushes information into a silo WEB 1 WEB 2 WEB N

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MONITORING SERVICE TRADITIONAL  MONITORING Pushes information into a silo WEB 1 WEB 2 WEB N

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MONITORING SERVICE TRADITIONAL  MONITORING Pushes information into a silo WEB 1 WEB 2 WEB N

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MONITORING SERVICE TRADITIONAL  MONITORING Pushes information into a silo WEB 1 WEB 2 WEB N

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MONITORING SERVICE TRADITIONAL  MONITORING Pushes information into a silo WEB 1 WEB 2 WEB N U

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MONITORING SERVICE TRADITIONAL  MONITORING Pushes information into a silo WEB 1 WEB 2 WEB N U F F

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MONITORING SERVICE TRADITIONAL  MONITORING Pushes information into a silo WEB 1 WEB 2 WEB N U F F

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CONSUL CONSUL  MONITORING Removes unhealthy nodes from service discovery layer WEB 1 WEB 2 WEB N

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CONSUL CONSUL  MONITORING Removes unhealthy nodes from service discovery layer WEB 1 WEB 2 WEB N

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CONSUL CONSUL  MONITORING Removes unhealthy nodes from service discovery layer WEB 1 WEB 2 WEB N dig web.service.consul 10.0.1.4 10.0.1.5 10.0.1.6

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CONSUL CONSUL  MONITORING Removes unhealthy nodes from service discovery layer WEB 1 WEB 2 WEB N dig web.service.consul 10.0.1.4 10.0.1.5 10.0.1.6

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CONSUL CONSUL  MONITORING Removes unhealthy nodes from service discovery layer WEB 1 WEB 2 WEB N dig web.service.consul 10.0.1.5 10.0.1.6

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CONSUL CONSUL  MONITORING Removes unhealthy nodes from service discovery layer WEB 1 WEB 2 WEB N dig web.service.consul 10.0.1.5 10.0.1.6 host: web.service.consul

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CONSUL CONSUL  MONITORING Removes unhealthy nodes from service discovery layer WEB 1 WEB 2 WEB N dig web.service.consul 10.0.1.5 10.0.1.6 host: web.service.consul

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CONSUL CONSUL  MONITORING Removes unhealthy nodes from service discovery layer WEB 1 WEB 2 WEB N dig web.service.consul 10.0.1.5 10.0.1.6 host: web.service.consul

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CONSUL CONSUL  MONITORING Removes unhealthy nodes from service discovery layer WEB 1 WEB 2 WEB N dig web.service.consul 10.0.1.5 10.0.1.6 host: web.service.consul

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CONSUL CONSUL  MONITORING Removes unhealthy nodes from service discovery layer WEB 1 WEB 2 WEB N dig web.service.consul 10.0.1.4 10.0.1.5 10.0.1.6 host: web.service.consul

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CONSUL  MONITORING Unhealthy nodes are not returned from DNS queries dig web.service.consul web-01, web-02, web-03

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CONSUL  MONITORING Unhealthy nodes are not returned from HTTP API curl /v1/services/web web-01, web-02, web-03

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LOCKING

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CONSUL  LOCK Allows for a new kind of "HA" demo  master consul lock [options] prefix child...

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CONSUL  LOCK Making standby HA much simpler CONSUL VAULT 1 VAULT 2 VAULT 3

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CONSUL  LOCK Making standby HA much simpler CONSUL VAULT 1 VAULT 2 VAULT 3 L L

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CONSUL  LOCK Making standby HA much simpler CONSUL VAULT 1 VAULT 2 VAULT 3 L

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CONSUL  LOCK Making standby HA much simpler CONSUL VAULT 1 VAULT 2 VAULT 3 L LEADER  ELECTION

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CONSUL  LOCK Making standby HA much simpler CONSUL VAULT 1 VAULT 2 VAULT 3 L GET /secret/foo REQUEST

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CONSUL  LOCK Making standby HA much simpler CONSUL VAULT 1 VAULT 2 VAULT 3 L GET /secret/foo REQUEST

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CONSUL  LOCK Making standby HA much simpler CONSUL VAULT 1 VAULT 2 VAULT 3 L GET /secret/foo REQUEST

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CONSUL  LOCK Making standby HA much simpler CONSUL VAULT 1 VAULT 2 VAULT 3 L

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CONSUL  LOCK Making standby HA much simpler CONSUL VAULT 1 VAULT 2 VAULT 3 l

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CONSUL  LOCK Making standby HA much simpler CONSUL VAULT 1 VAULT 2 VAULT 3 L

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CONSUL  LOCK Making standby HA much simpler CONSUL VAULT 1 VAULT 2 VAULT 3 L

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CONSUL  LOCK Making standby HA much simpler VAULT 1 VAULT 2 VAULT 3 GET /secret/foo REQUEST CONSUL L

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CONSUL  LOCK Making standby HA much simpler VAULT 1 VAULT 2 VAULT 3 GET /secret/foo REQUEST CONSUL L

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CONSUL  LOCK Solves the "exactly one of these must always be running" problem

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CONSUL  LOCK Also great as a semaphore - rolling restarts

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SCALABILITY

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MONITORING SERVICE TRADITIONAL  MONITORING Notifies/polls all statuses WEB 1 WEB 2 WEB N "I'm healthy" "Good, thanks for asking!"

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MONITORING SERVICE TRADITIONAL  MONITORING Notifies/polls all statuses WEB 1 WEB 2 WEB 1,000 1,000'S OF REQUESTS

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MONITORING SERVICE TRADITIONAL  MONITORING Notifies/polls all statuses WEB 1 WEB 2 WEB 1,000 1,000'S OF REQUESTS HA

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CONSUL WEB 1 WEB 2 WEB N My status has changed CONSUL  MONITORING Notifies on status changes

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CONSUL CONSUL  MONITORING Notifies on status changes WEB 1 WEB 2 WEB 1,000 10'S OF REQUESTS

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CONCLUSION

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SERVICE   DISCOVERY LOAD   BALANCING HEALTH   CHECKING KEY-­‐VALUE   CONFIGURATION SOLVES  4  BASIC  PROBLEMS

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9 H G L RESPONSIVE LEADER   ELECTION SEMAPHORE   LOCKING SCALABLE SOLVES  4  MORE  PROBLEMS

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SETH VARGO @sethvargo QUESTIONS?