KubeCon 2019 Follow-up

By Corey Gale

Source: https://www.reddit.com/r/kubernetes/comments/e5b5gb/kubecon_san_diego/

Random Keynote Notes

  • According to the Linux foundation, eBPF will be replacing iptables in Linux
  • K8s is young (5 years public usage)
  • Arm sponsoring CNCF
    • 150B+ Arm-based chips shipped
    • “Cloud Native on Arm”
    • Edge-to-cloud
  • New jobs board: jobs.cncf.io
  • KubernetesCommunityDays.org

Random Keynote Notes Cont'

  • K8s v1.16

    • ​CRDs reach GA

    • Metrics overhaul

    • CSI enhancements

      • Resizing

      • Clone volumes

      • Inline volume support in beta (good for ephemeral attachments)

    • Ephemeral containers (alpha feature)

      • Can attach to a running pod

      • Example: tcpdump, filesystem inspection

      • Needs to be turned on

CNCF Project Updates

  • Requirements for graduation: adoption, maintainer diversity, project health

  • Vitess (graduated)

    • Cloud native DB, super scalable, reliable (5 9s)

    • 35% of Slack is on Vitess, 100% by end of 2020

    • JD.com uses Vitness @ 35M QPS (30k pods, 4k keyspaces)

  • LinkerD (incubating)
    • Canary rollout feature​
    • Request tracing
  • Helm (incubating)
    • Critical mass: 1M downloads/month, 600 contributors, 29 maintainers, 15 companies

CNCF Project Updates Cont'

  • Jaeger (graduated)

  • Open Policy Agent (OPA) (incubating)

    • Decouples policy definitions and environment/enforcement

    • Flexible, fine-grained control across the stack

    • Side-car or host-level daemon

    • Declarative policy language: Rego

  • Etcd (incubating)

    • Can now scale up to 5000 node k8s clusters

CNCF Project Updates Cont'

  • NATS

    • Cloud-native messaging service

    • Scalable services and streams

    • Tinder used NATS to migrate poll workloads to push

    • Added Prometheus exporters & Grafana dashboards

    • FluentD, Kafka integrations

    • Goal: connect everything

Low Latency Multi-cluster Networking with Kubernetes

  • Lyft (talk link)
  • Scale: 100+ stateless microservices, 10K+ pods

    • ML: 5k+ pods, 10k+ cores

    • Ridesharing: 100k+ containers (sidecars), 50k+ cores

  • Lyft CNI stack requirements: VPC native, low latency, high throughput

  • cni-ipvlan-vpc-k8s

    • No overlay network, very low IPvlan overhead

    • Envoy Manager (EM): side-cars connect to EM

    • Not looking to add significant features

Cortex 101: Horizontally Scalable Long Term Storage for Prometheus

  • Splunk (talk link)
  • System: Prometheus > distributor > ingestor (talks to etcd/Consul) > store

  • Cortex Architecture

  • Long term storage options: DynamoDB, Google Big Table, S3, Google Cloud Storage, Cassandra

  • Includes tools for auto-scaling LTS

  • What’s new?

    • ​Ingestors can ship blocks instead of chunks

    • Write-ahead logging for ingestors

  • ​Mentioned Thanos

Towards Continuous Computer Vision Model Improvement with Kubeflow

  • Snap Inc. (talk link)
  • Scale: 3.5 billions snaps/day, 210 million daily active users, 600k lenses created
  • Your model is only as good as your training data

  • Problem: we need more labeled data, but what kind of data exactly?

  • Solution: The Loop workflow (see slide shot)

    • Uses Sage Maker ground truths

  • ​Case study: pipeline orchestrator comparisons

Scaling Kubernetes to Thousands of Nodes Across Multiple Clusters, Calmly

  • AirBnB (talk link)
  • Re: cluster size: hard limit of 5000 nodes
  • You can definitely probably do 2500​
  • “Yeah, things get a lot more difficult after 2500” - various conversations
  • Alibaba recently got a 10000 node cluster working with a lot of extra work

  • Limit: etcd OOM’ing, fixed in etdc v3

  • ~2300 nodes/cluster AirBnB’s max

  • Approach: workloads can be scheduled on any cluster

GitOps User Stories

Helm 3 Deep Dive

  • Microsoft & IBM (talk link)

  • Helm 3 announced. Major changes:

    • ​No more Tiller

    • Chart repository: Helm Hub

    • Release "upgrade" strategy

    • Testing framework

    • Dependencies moved into manifest

    • Chart value validation

    • “3-way merge”

      • Considers old manifest, new manifest and current values (addresses manually updated values)

    • Releases stored as secrets in the same namespace as the release

Kubernetes at Reddit: Tales from Production

  • Reddit (talk link)

  • Reddit scale:

    • 500M+ monthly active users

    • 16M+ posts, 2.8B+ votes per month

  • Before: 1 cluster per region (3 AZs)

  • After: 1 cluster per AZ (3 clusters per region)

  • What went well:

    • Cost and latency savings from silo’d AZs.

    • Mirrored clusters have prevented outages.

  • ​What didn’t:

    • More clusters, more admin overhead.

Other Talks I Attended

  • Use Your Favorite Developer Tools in Kubernetes With Telepresence
  • Improving Performance of Deep Learning Workloads With Volcano
  • How Kubernetes Components Communicate Securely in Your Cluster
  • The Gotchas of Zero-Downtime Traffic w/Kubernetes
  • ​Solving Multi-Cluster Network Connectivity With Submariner

My Raw Notes

  • Google Doc
  • Notes for every talk I attended
  • Slide decks linked when provided

Questions?

KubeCon 2019

By Corey Gale

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KubeCon 2019

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