Open Source Site Reliability Engineering Tools

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Who am I? Mickey Boxell Solution Architect, Developer Advocate, etc. Oracle Cloud Native Labs Build customer-deployable cloud native/container native solutions to bridge the gap between Oracle Cloud Infrastructure (OCI) and open source communities. http://cloudnative.oracle.com/ Copyright © 2017, Oracle and/or its affiliates. All rights reserved. |

Context: An Era of Microservices Microservice environments: • Distributed • Container-based • Polyglot • Highly-scalable • Ephemeral Copyright © 2017, Oracle and/or its affiliates. All rights reserved. |

Observability • Designing and operating a more visible system • Systems experience failure – be prepared • Can you test your system in a realistic way? • Can you monitor external outputs? • Have you considered the business impact? Copyright © 2017, Oracle and/or its affiliates. All rights reserved. |

Observability External outputs: • Logs: a record of an event that took place at a given time • Metrics: numeric aggregation of data describing behavior of a component or service measured over time • Tracing: capturing a request flow of causally-related events in a distributed environment Copyright © 2017, Oracle and/or its affiliates. All rights reserved. |

Observability – the SRE Approach • Site Reliability Engineering (SRE): reliably operating systems and infrastructure at scale • Service level indicators (SLIs), Service level objectives (SLOs), Service level agreements (SLAs) • Define metrics that matter most to the business, ideal values for those metrics, and the planned reaction if values aren’t met • Increase mean time to failure (MTTF) decrease mean time to repair (MTTR) Copyright © 2017, Oracle and/or its affiliates. All rights reserved. |

Sample Application • Built using the Helidon framework – Java libraries for microservice development • Main.java and RESTful GreetService.java along with app.yaml • Tracing, health, and metrics instrumented • Deployed on Kubernetes with sidecar injection enabled Copyright © 2017, Oracle and/or its affiliates. All rights reserved. |

Logging • Logs: a record of an event that took place at a given time • Supported by most libraries • Disciplined to put meaningful logs into your code • Aggregate logs to avoid losing them • Java logging classes and a logging.properties configuration file writing to stdout Copyright © 2017, Oracle and/or its affiliates. All rights reserved. |

Logging • FluentD used to scrape logs, process, and ship them • Stored in a persistent data store, such as Elasticsearch, distributed analytics engine • Queried directly or interacted with by means of Kibana, a customizable visualization dashboard • Choose a tool to capture and analyze logs Copyright © 2017, Oracle and/or its affiliates. All rights reserved. |

Metrics • Metrics: numeric aggregation of data describing behavior of a component or service measured over time • Easy to store and model • Useful to understand typical system behavior • Supported by most libraries • Java metrics classes that push data to a /metrics endpoint Copyright © 2017, Oracle and/or its affiliates. All rights reserved. |

Metrics • Prometheus, open source systems monitoring toolkit, includes libraries to create in-process samples, tools to scrape data and also send it to the Prometheus time-series database, and also a query language to analyze the data • Grafana, an open source data visualization tool for monitoring, can be used to aggregate metric data from numerous sources into dashboards that provide a summary view of key metrics Copyright © 2017, Oracle and/or its affiliates. All rights reserved. |

Metrics • Oracle Cloud Monitoring Service offers out of the box aggregated metrics for Oracle Cloud Infrastructure resources • Metrics are available on the Oracle Cloud Console and via API • We worked with Grafana to expose the Monitoring service as a Grafana data source Copyright © 2017, Oracle and/or its affiliates. All rights reserved. |

Metrics - Alerting • Alerts: notifications indicating a human needs to take action in response to something that is either happening or about to happen to improve the situation • Metrics are well-suited to trigger alerts • Grafana can be used to create a rule that will trigger an alert when particular conditions are met Copyright © 2017, Oracle and/or its affiliates. All rights reserved. |

Tracing • Tracing: capturing a request flow of causally-related events in a distributed environment - visibility into request structure and path Each has a request a global ID - metadata inserted at each step in the flow, referred to as a span, as the ID is passed along • Distributed tracing systems like Jaeger or Zipkin are used to visualize + inspect traces • OpenTracing: a language-neutral approach to distributed tracing Copyright © 2017, Oracle and/or its affiliates. All rights reserved. |

Service Mesh • Service Mesh : configurable infrastructure layer for microservice applications used to control east-west traffic between services • Monitor and control the flow of traffic through your cluster • Service meshes use the sidecar pattern, the practice of provisioning each pod with a proxy container Copyright © 2017, Oracle and/or its affiliates. All rights reserved. |

Service Mesh • Simplifies tracing: meshes can capture latency, retry, and failure information for each hop in a request • Istio provides out of the box integrations with a number of open source observability tools: Grafana, Prometheus, Jaeger, and Kiali, and also prepopulate them with helpful dashboards • Kiali: an observability tool for Istio that helps you visualize the relationships between services running in the mesh Copyright © 2017, Oracle and/or its affiliates. All rights reserved. |

Key Takeaways • Observability takes a holistic approach to operations • Its practices give you maximum visibility into the behavior of a modern distributed system • Gain insight from logging, metrics, and tracing - discover issues, pinpoint their location, and determine a fix • Proactively test and improve system performance/efficiency • Recognize impact to the business Copyright © 2017, Oracle and/or its affiliates. All rights reserved. |

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Open Source Site Reliability Engineering Tools

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