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DevOpsFest 2019 - DevOps never sleeps. What we learned from InfluxDB v1 to v2

DevOpsFest 2019 - DevOps never sleeps. What we learned from InfluxDB v1 to v2

Where a company with an OpenSource project announce that they are working on a new major release there is always a lot of chatting going on in the community because you never know how much this is going to break your system. Gianluca Arbezzano SRE at InfluxData will speak about the journey the company is facing from a DevOps perspective to move from InfluxDB v1 to version 2 a fully integrated platform that starts from the strong background we built running a database like InfluxDB at scale in our SaaS offer. This is not just a story about how a project evolved but it touches all the company in particular for what concern DevOpsFest everything around Kubernetes, Container and automation. How the SRE team managed the onboard of 20 developers on a cloud based project where operating and observing the system is a key concept to learn how to build a more solid and sustainable product.

Gianluca Arbezzano

April 06, 2019

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  1. Gianluca Arbezzano Site Reliability Engineer @InfluxData • https://gianarb.it • @gianarb

    What I like: • I make dirty hacks that look awesome • I grow my vegetables • Travel for fun and work
  2. © 2018 InfluxData. All rights reserved. 7 @gianarb - gianluca@influxdb.com

    DevOps likes automation. Automation likes code. YAML is not code.
  3. 1. You Know! Your team knows and use Docker for

    local development and testing 2. Kubernetes! Everyone speaks about kubernetes. 3. Hire! You don’t know why but you hired a DevOps that kind of know k8s. 3. Excitement! You are moving everything and everyone to kubernetes
  4. K8s as code: From YAML to code (golang) 1. You

    have the ability to use Golang autocomplete as documentation, reference for every kubernetes resources 2. You feel less a YAML engineer (great feeling btw) 3. Code is better than YAML! You can reuse it, compile it, embed it in other projects.
  5. K8s as code: From YAML to code (golang) Tiny cli

    to make the migration to golang Some manual refactoring
  6. K8s as code: From YAML to code (golang) Tiny cli

    to make the migration to golang Some manual refactoring • Continue to improve our CI to validate that YAML and Go file are the same, and the resources in Kubernetes are like the Go file. • Maybe we will be able to remove the YAML at some point.
  7. GitOps Your Git repository is the entrypoint for all your

    code changes. Infrastructure is ‘as code’, so the place where you make it happen should be Git. Read More on weave.com https://www.weave.works/technologies/gitops/
  8. © 2018 InfluxData. All rights reserved. 25 @gianarb - gianluca@influxdb.com

    apiVersion: extensions/v1beta1 kind: Deployment metadata: name: {{ template "drone.fullname" . }}-agent labels: app: {{ template "drone.name" . }} chart: "{{ .Chart.Name }}-{ .Chart.Version }}" release: "{{ .Release.Name }}" heritage: "{{ .Release.Service }}" component: agent spec: replicas: {{ .Values.agent.replicas }} template: metadata: annotations: checksum/secrets: {{ include (print $.Template.BasePath "/secrets.yaml") . | sha256sum }} {{- if .Values.agent.annotations } {{ toYaml .Values.agent.annotations | indent 8 } {{- end }} labels: app: {{ template "drone.name" . }} release: "{{ .Release.Name }}" component: agent
  9. © 2018 InfluxData. All rights reserved. 35 @gianarb - gianluca@influxdb.com

    We use docker as replacement for systemd for process management
  10. © 2018 InfluxData. All rights reserved. 36 @gianarb - gianluca@influxdb.com

    DIND - Docker in Docker $ docker run -it --rm -v /var/run/docker.sock:/var/run/docker.sock docker sh $ docker info Containers: 48 Running: 1 Paused: 0 Stopped: 47 containerd version: 9f2e07b1fc1342d1c48fe4d7bbb94cb6d1bf278b.m runc version: 871ba2e58e24314d1fab4517a80410191ba5ad01 init version: fec3683 Kernel Version: 4.20.13-arch1-1-ARCH Operating System: Arch Linux OSType: linux Architecture: x86_64 CPUs: 4 Total Memory: 15.42GiB Name: gianarb
  11. Instrumentation code is a first citizen in your codebase: OpenCensus

    • Open Source project sponsored by Google • It is a SPEC plus a set of libraries in different languages to instrument your application • To collect metrics, traces and events.
  12. OpenCensus Common Interface to collect stats and traces from your

    app Different exporters to persist your data
  13. gianarb.it ~ @gianarb # HELP http_requests_total The total number of

    HTTP requests. # TYPE http_requests_total counter http_requests_total{method="post",code="200"} 1027 1395066363000 http_requests_total{method="post",code="400"} 3 1395066363000 # Escaping in label values: msdos_file_access_time_seconds{path="C:\\DIR\\FILE.TXT",error="Cannot find file:\n\"FILE.TXT\""} 1.458255915e9 # Minimalistic line: metric_without_timestamp_and_labels 12.47 # A weird metric from before the epoch: something_weird{problem="division by zero"} +Inf -3982045 # A histogram, which has a pretty complex representation in the text format: # HELP http_request_duration_seconds A histogram of the request duration. # TYPE http_request_duration_seconds histogram http_request_duration_seconds_bucket{le="0.05"} 24054 http_request_duration_seconds_bucket{le="0.1"} 33444 http_request_duration_seconds_bucket{le="0.2"} 100392 http_request_duration_seconds_bucket{le="0.5"} 129389 http_request_duration_seconds_bucket{le="1"} 133988 http_request_duration_seconds_bucket{le="+Inf"} 144320 http_request_duration_seconds_sum 53423 http_request_duration_seconds_count 144320
  14. gianarb.it ~ @gianarb func FetchMetricFamilies(url string, ch chan<- *dto.MetricFamily, certificate

    string, key string, skipServerCertCheck bool) error { defer close(ch) var transport *http.Transport if certificate != "" && key != "" { cert, err := tls.LoadX509KeyPair(certificate, key) if err != nil { return err } tlsConfig := &tls.Config{ Certificates: []tls.Certificate{cert}, InsecureSkipVerify: skipServerCertCheck, } tlsConfig.BuildNameToCertificate() transport = &http.Transport{TLSClientConfig: tlsConfig} } else { transport = &http.Transport{ TLSClientConfig: &tls.Config{InsecureSkipVerify: skipServerCertCheck}, } } https://github.com/prometheus/prom2json/blob/master/prom2json.go#L123
  15. Summary: ★ Do not be scared to write your code!

    ★ Use the API ★ Instrumentation code is a first class citizen ★ Keep calm and observe all together!
  16. © 2018 InfluxData. All rights reserved. 53 @gianarb - gianluca@influxdb.com

    Credits and Links ¨ https://www.weave.works/technologies/gitops/ ¨ http://gianarb.it ¨ https://thenewstack.io/why-you-cant-afford-to-ignore-distributed-tracing-for-observability/ ¨ https://www.honeycomb.io/blog/ ¨ https://gianarb.it/blog/infra-as-code-short-long-ttl-resource ¨ https://gianarb.it/blog/kubernetes-shared-informer ¨ https://github.com/OpenObservability/OpenMetrics ¨ https://promcon.io/2018-munich/slides/openmetrics-transforming-the-prometheus-exposition-format-into-a -global-standard.pdf ¨ https://medium.com/opentracing/merging-opentracing-and-opencensus-f0fe9c7ca6f0