Developing apps on Kubernetes Michael Hausenblas @mhausenblas
 Developer Advocate, Red Hat
 2018-04-04, CNCF Paris

Hit me up on Twitter: @mhausenblas 2 • Developer Advocate @ Red Hat (Go, Kubernetes, OpenShift) • Developer Advocate @ Mesosphere (Mesos, DC/OS, Kubernetes) • Chief Data Engineer @ MapR (HDFS, HBase, Drill, etc.) • Applied research (4y in Ireland, 7y in Austria) • Nowadays mainly developing tools in Go (Python, Node, Java, C++) • Kinda developer turned ops (aka appops) $ whois mhausenblas

Hit me up on Twitter: @mhausenblas 3 admin SRE developer QA architect PM PHB

… demo time! 301.sh/2018-dok-cncfparis

Hit me up on Twitter: @mhausenblas 5 Demo example: a minimal µS-based app • App consists of two microservices: • a stock generator written in Go • a stock consumer written in Node.js • Source code of demo app:
 github.com/kubernauts/dok-example-us • Demo script:
 301.sh/2018-dok-cncfparis stock-gen stock-con

Hit me up on Twitter: @mhausenblas 6 stock-gen :9876/stockdata stock-con :9898/average/NYSE:RHT

Building and delivering apps on Kubernetes

Hit me up on Twitter: @mhausenblas 8 Build and delivery status quo build artefacts build tooling runtime config code creds CI/CD pipeline |||| code repo binary bare metal server/VMs

Hit me up on Twitter: @mhausenblas 9 Doing it the cloud native way build artefacts build tooling runtime CI/CD pipeline |||| code repo container container orchestrator +
 service mesh config code creds container image manifest container runtime manifest service mesh manifest container
 registry

Development modes

Hit me up on Twitter: @mhausenblas 11 • You are part of a devops team, developing three µS that in turn depend on five µS outside of your control • Have Node.js/Java/Python and Kubernetes cluster 
 as target runtime environment • Want ✓ high development velocity
 ✓ dev/ops parity An example brief …

Hit me up on Twitter: @mhausenblas 12 Development modes (conceptually) remote local cluster dev cluster dev cluster dev dev cluster pure off-line proxied live pure on-line

Tooling

Hit me up on Twitter: @mhausenblas 14 telepresence.io vapor-ware.github.io/ksync/ www.openshift.org kubed.sh kedgeproject.org ksonnet.io Minikube Minishift Docker Community Edition for Mac & Windows github.com/GoogleCloudPlatform/skaffold draft.sh forge.sh gitkube.sh github.com/weaveworks/flux

Hit me up on Twitter: @mhausenblas 15 Minikube • Different modes possible, for example: • Using standard CI/CD pipeline like Jenkins with any registry (for example Quay) for online development • Local builds via eval $(minikube docker-env) • Community-driven, part of Kubernetes proper • See docs for details

Hit me up on Twitter: @mhausenblas 16 ksync vapor-ware.github.io/ksync/ • A file sync-based tool, leveraging syncthing.net • Local and/or live setups possible • Super easy and fast, requires cluster-side process via daemon set (permissions) • Try it out via Katacoda for free, in your browser


Hit me up on Twitter: @mhausenblas 17 Source-to-Image (S2I) • A build-based tool and workflow • Local (Minishift) or live (OpenShift Online) • Battle proof solution, by Red Hat • See docs for details

Hit me up on Twitter: @mhausenblas 18 Skaffold github.com/GoogleCloudPlatform/skaffold • A build-based tool and workflow • Local and GKE • Relatively new, by Google Cloud • See intro blog post for details


Hit me up on Twitter: @mhausenblas 19 Telepresence www.telepresence.io • A proxy-based tool • Local and live setups possible • Mature but requires cluster-side process (permissions) • By Datawire (have also forge.sh)

Workflows by example

Hit me up on Twitter: @mhausenblas 21 Example 1: all local/not containerized • Each service developed locally (e.g., on your laptop) • Natively, that is, in a non- containerized manner

Hit me up on Twitter: @mhausenblas 22 Example 1: all local/not containerized • Pros • continue to work as you “always did” • high development velocity • Cons • dependency hell • dev/prod imparity

Hit me up on Twitter: @mhausenblas 23 Example 2: all local/containerized • Each service developed locally (e.g., on your laptop) • One container image per service, locally managed (build, run, etc.)

Hit me up on Twitter: @mhausenblas 24 Example 2: all local/containerized • Pros • minimal overhead, can learn in hours • no dependency hell • high development velocity • Cons • still not full dev/ops parity

Hit me up on Twitter: @mhausenblas 25 Example 3: mixed local/cluster • “Your” service developed locally (containerized or not) • Other service(s) run in the cluster

Hit me up on Twitter: @mhausenblas 26 Example 3: mixed local/cluster • Pros • almost full dev/ops parity • Cons • requires tooling (proxy, CI/CD) • Neutral • development velocity depends on tooling

Hit me up on Twitter: @mhausenblas 27 Example 4: all in-cluster • “Your” service developed locally and container image is pushed to cluster (registry) • All services run in the cluster

Hit me up on Twitter: @mhausenblas 28 Example 4: all in-cluster • Pros • full dev/ops parity • scalability (testing!) • Cons • development velocity sucks

Hit me up on Twitter: @mhausenblas 29 • Prototyping/testing of microservices: • Minikube with ksync/Telepresence • Minikube with local build setup • forge.sh, gitkube • Team-level/integration: • Skaffold, draft.sh • S2I with internal registry or Jenkins pipeline with external registry Recommendations

Resources

Hit me up on Twitter: @mhausenblas 31

Hit me up on Twitter: @mhausenblas 32 • Local Development Environment for Kubernetes using Minikube
 https://abhishek-tiwari.com/local-development-environment-for-kubernetes-using-minikube/ • TGI Kubernetes 029: Developing Apps with Ksync
 https://www.youtube.com/watch?v=QW85Y0Ug3KY • TGI Kubernetes 030: Exploring Skaffold
 https://www.youtube.com/watch?v=McwwWhCXMxc • Using Telepresence for Kubernetes Development
 https://www.youtube.com/watch?v=G8fA_JssUG8 • Git based application deployment patterns for Kubernetes
 https://docs.google.com/presentation/d/1d3PigRVt_m5rO89Ob2XZ16bW8lRSkHHH5k816-oMzZo/ • Draft vs Gitkube vs Helm vs Ksonnet vs Metaparticle vs Skaffold
 https://blog.hasura.io/draft-vs-gitkube-vs-helm-vs-ksonnet-vs-metaparticle-vs-skaffold-f5aa9561f948 


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