Spring Boot for Devops

SPRINGONE2GX WASHINGTON, DC

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Spring Boot for DevOps Nicolas Fränkel

@nicolas_frankel


Pardon my French…

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Those don’t go well together

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Me, Myself and I

•  Developer & Architect

–  As Consultant

•  Teacher/trainer

•  Blogger


hybris, an SAP company

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Shameless self-promotion

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DevOps

•  Devs and Ops collaboration?

•  Treat your infrastructure as code?

•  Automate everything?


DevOps

•  Meta-data

•  Health checks

•  Metrics


A little story


Spring Boot to the rescue

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Non-Functional Requirements

•  Meta data

•  Monitoring

–  Health checks

–  Metrics


Non-Functional Requirements

•  Configuration

–  Beans

–  Property values

–  Controller mappings

–  etc.


Enough talk, time for a demo


POM

<dependency> <groupId>

org.springframework.boot </groupId>

<artifactId> spring-boot-starter-actuator </artifactId>

</dependency>


Some endpoints

•  /metrics

•  /healthcheck

•  /configprops


Formatting

•  This is not really readable…


RESTFul endpoints

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1. Meta data

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Meta data

•  Which application?

–  groupId

–  applicationId

•  Version

–  From Maven

–  From Git

•  Anything!!!

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Demo time


2. Health checks

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Health checks

•  A good way to monitor your application

•  Each check wraps a dependency

•  e.g. a datasource


Health checks

•  Each check returns an Health object

–  Status •  UP

•  DOWN •  UNKWOWN •  OUT_OF_SERVICE

–  Possibly with details


Health checks endpoint

•  /health aggregates all checks

•  Health are objects

–  Serialized in JSON

•  If only one is down, the HTTP code is set to 5xx


Health checks

•  Bean must implement HealthIndicator

•  Doesn’t use Dropwizard HealthCheck


Demo time


3. Metrics

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Dropwizard Metrics

•  A metrics model

•  Exporters to backends

•  And more…


Simple metrics

•  Gauge

–  Simple value

•  Counter

–  Incrementable gauge


Dropwizard reporters

•  JMX

•  Graphite

•  (HTTP)


jconsole

•  JMX-compliant GUI for monitoring JVM



Demo time


Add Dropwizard metrics

<dependency> <groupId>io.dropwizard.metrics</groupId> <artifactId>metrics-graphite</artifactId> <version>4.0.0-SNAPSHOT</version> </dependency>


Send metrics to JMX

@Bean public JmxReporter jmxReporter() {

JmxReporter reporter =

JmxReporter.forRegistry(registry).build(); reporter.start(); return reporter;

}


Graphite

•  Store numeric time-series data

•  Render graphs of this data on demand


Starting carbon if not ready

•  sudo su bin/carbon-cache.py start


Send metrics to Graphite

@Bean public GraphiteReporter graphiteReporter() { Graphite graphite = new Graphite(

new InetSocketAddress("localhost",2003)); GraphiteReporter reporter =

GraphiteReporter.forRegistry(registry)

.prefixedWith("boot").build(graphite);

reporter.start(500, TimeUnit.MILLISECONDS); return reporter;

}


For development

•  Either define the 2 reporters

–  Set @ConditionalOnMissingBean

–  Use a "Development" profile

•  Or define only the JMX reporter

–  In production, use JMXTrans


Metrics are not only technical


Q&A

https://github.com/nfrankel/enhanced-pet-clinic

@nicolas_frankel

http://frankel.in/

http://blog.frankel.ch/

https://leanpub.com/integrationtest/c/SpringOne

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Unless otherwise indicated, these s l ides are © 2013-2015 Pivotal Software, Inc. and l icensed under a Creat ive Commons Attr ibut ion-NonCommercial l icense: ht tp: / /creat ivecommons.org/ l icenses/by-nc/3.0/ 42

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