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IntrotoTelepresence:
FastDevelopmentWorkflowsforKubernetes
@danielbryantuk | @datawireio 2
tl;dr
The inner development loop can be painful with microservices + Kubernetes
Telepresence proxies your dev machine into the cluster
Telepresence supports several workflows, from small to large systems
Ongoing work for splitting client and cluster components
Please support this CNCF project — get involved!
3
SettingtheScene
@danielbryantuk | @datawireio 4
https://mitchdenny.com/the-inner-loop/
@danielbryantuk | @datawireio 5
The Kubernetes inner & outer loop can be the same…
Write code
Build container
Push to registry
Deploy to cluster
Test
And can be …. SLOW.
@danielbryantuk | @datawireio 6
Automation helps speed it up …
@danielbryantuk | @datawireio 7
But you want a really fast inner loop (no docker build/push) …
And you want to use your own tools.
@danielbryantuk | @datawireio 9
Let’s do everything locally…
…so it’s really fast and I can use my tools!
@danielbryantuk | @datawireio 10
“My laptop only
has 16GB RAM and
you’re asking it to
run Kubernetes
and a JVM and a
database???”
12
TELEPRESENCE
@danielbryantuk | @datawireio 13
WhatisTelepresence?
“Fancy Kubernetes VPN for development”
“kubectl port-forward on steroids”
A network bridge between your laptop and the Kubernetes cluster
@danielbryantuk | @datawireio 14
Howitworks
A B
C
A’
The “A” deployment is
replaced by a proxy. Requests
to the proxy are sent to the
laptop.
Telepresence:
1. Intercepts DNS
2. Environment variables &
secrets
3. Volumes
4. TCP
17
DEMO
@danielbryantuk | @datawireio 18
Benefits
Use any tool that runs on your laptop: IDE, profiler, debugger, …
Connect to cloud-based resources
Same network namespace (e.g., nslookup works)
Very fast inner loop!
Requirements
• Network connection
• kubectl access to cluster
• Mac or Linux
19
TelepresenceisaCNCFproject,withawide
varietyofusers.
@danielbryantuk | @datawireio 20
@danielbryantuk | @datawireio 21
Capturing DNS and routing only part of it
to the cluster is tricky
No two laptops are alike
Swapping out your (real) deployment for
a (proxy) deployment is tricky
22
USINGTHISINYOUR
WORKFLOW
@danielbryantuk | @datawireio 23
One (production) cluster for single-source-of-truth microservices
Developer checks out code and works on microservices
Swapping services on demand using Telepresence + IDE
Telepresence is used in default (vpn-tcp) mode
Once code is done, microservices are built and deployed via pipeline
SimpleWorkflow(YOLO)
https://www.youtube.com/watch?v=75soljoqhjY
@danielbryantuk | @datawireio 25
One (dev) cluster for single-source-of-truth microservices
Developers check out one of the microservices (and coordinate with other devs)
Developers Telepresence + IDE
Telepresence is used in default (vpn-tcp) mode
Once code is done, CircleCI is used to run tests, build, and deploy
TypicalWorkflow(SME)
https://www.youtube.com/watch?v=75soljoqhjY
@danielbryantuk | @datawireio 26
One cluster with multiple namespaces for all single-source-of-truth
microservices
Developers check out one of the microservices
Developers use Bazel + Telepresence + IDE
Telepresence is used in container mode with Bazel images
Once code is done, Jenkins is used to run tests, build, and deploy
AdvancedWorkflow
https://www.youtube.com/watch?v=tD0FIlxO1AQ
27
WHAT’SNEXT?
@danielbryantuk | @datawireio 28
Telepresencecomponents
Proxy Server
Client
Capture DNS requests for Kubernetes resources
DNS resolution for Kubernetes resources
Proxy TCP connections to cluster
Proxy TCP connections to laptop
Canonical DNS for Kubernetes resources
@danielbryantuk | @datawireio 29
TelepresenceClient
Use kubectl port-forward to bootstrap sshuttle (ssh-based VPN)
sshuttle has a lot of functionality that is not used by Telepresence (it’s a VPN, after all)
Replace sshuttle with something else — designed for Kubernetes
• Capture DNS locally
• Do DNS resolution intelligently
• Redirect TCP connections to the right destination
Already in progress, will replace VPN-TCP method
Also support multiple simultaneous swaps
@danielbryantuk | @datawireio 30
TelepresenceProxyServer
Currently deployed every time you do a swap-deployment (and then deleted)
Switch mode to be persistent (this is what Kubernetes is good for)
• Speeds up startup
• Support reconnect
@danielbryantuk | @datawireio 31
Multi-UserDevelopment
Swap deployment doesn’t work well for multi-user development
Solution today is to use namespaces and/or individual clusters
• Expensive (more hardware & setup)
• Delays integration testing until after commit
@danielbryantuk | @datawireio 33
34
WrappingUp
@danielbryantuk | @datawireio 35
ContributingtoTelepresence
Documentation and workflows
* how you integrate Telepresence into your development workflow
Let us know if you’re a user!
Triage
* Lots of folks use GitHub for support, which doesn’t scale well
Join Slack to help other users https://d6e.co/slack #telepresence
@danielbryantuk | @datawireio 36
Thankyou!Questions?
db@datawire / @danielbryantuk
www.telepresence.io
https://github.com/telepresenceio
More KubeCon sessions — 17:20 Today!!
* “Use Your Favorite Developer Tools in Kubernetes With
Telepresence” by Abhay Saxena in Room 30ABCDE
Visit us at Booth #S46
Sign up for the Ambassador Edge Stack preview
* https://www.getambassador.io/early-access

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KubeCon NA 2019 "Introduction to Telepresence: Fast Development (and Debugging) for Kubernetes"

  • 2. @danielbryantuk | @datawireio 2 tl;dr The inner development loop can be painful with microservices + Kubernetes Telepresence proxies your dev machine into the cluster Telepresence supports several workflows, from small to large systems Ongoing work for splitting client and cluster components Please support this CNCF project — get involved!
  • 4. @danielbryantuk | @datawireio 4 https://mitchdenny.com/the-inner-loop/
  • 5. @danielbryantuk | @datawireio 5 The Kubernetes inner & outer loop can be the same… Write code Build container Push to registry Deploy to cluster Test And can be …. SLOW.
  • 6. @danielbryantuk | @datawireio 6 Automation helps speed it up …
  • 7. @danielbryantuk | @datawireio 7 But you want a really fast inner loop (no docker build/push) …
  • 8. And you want to use your own tools.
  • 9. @danielbryantuk | @datawireio 9 Let’s do everything locally… …so it’s really fast and I can use my tools!
  • 10. @danielbryantuk | @datawireio 10 “My laptop only has 16GB RAM and you’re asking it to run Kubernetes and a JVM and a database???”
  • 11.
  • 13. @danielbryantuk | @datawireio 13 WhatisTelepresence? “Fancy Kubernetes VPN for development” “kubectl port-forward on steroids” A network bridge between your laptop and the Kubernetes cluster
  • 14. @danielbryantuk | @datawireio 14 Howitworks A B C A’ The “A” deployment is replaced by a proxy. Requests to the proxy are sent to the laptop. Telepresence: 1. Intercepts DNS 2. Environment variables & secrets 3. Volumes 4. TCP
  • 15.
  • 16.
  • 18. @danielbryantuk | @datawireio 18 Benefits Use any tool that runs on your laptop: IDE, profiler, debugger, … Connect to cloud-based resources Same network namespace (e.g., nslookup works) Very fast inner loop! Requirements • Network connection • kubectl access to cluster • Mac or Linux
  • 21. @danielbryantuk | @datawireio 21 Capturing DNS and routing only part of it to the cluster is tricky No two laptops are alike Swapping out your (real) deployment for a (proxy) deployment is tricky
  • 23. @danielbryantuk | @datawireio 23 One (production) cluster for single-source-of-truth microservices Developer checks out code and works on microservices Swapping services on demand using Telepresence + IDE Telepresence is used in default (vpn-tcp) mode Once code is done, microservices are built and deployed via pipeline SimpleWorkflow(YOLO) https://www.youtube.com/watch?v=75soljoqhjY
  • 24.
  • 25. @danielbryantuk | @datawireio 25 One (dev) cluster for single-source-of-truth microservices Developers check out one of the microservices (and coordinate with other devs) Developers Telepresence + IDE Telepresence is used in default (vpn-tcp) mode Once code is done, CircleCI is used to run tests, build, and deploy TypicalWorkflow(SME) https://www.youtube.com/watch?v=75soljoqhjY
  • 26. @danielbryantuk | @datawireio 26 One cluster with multiple namespaces for all single-source-of-truth microservices Developers check out one of the microservices Developers use Bazel + Telepresence + IDE Telepresence is used in container mode with Bazel images Once code is done, Jenkins is used to run tests, build, and deploy AdvancedWorkflow https://www.youtube.com/watch?v=tD0FIlxO1AQ
  • 28. @danielbryantuk | @datawireio 28 Telepresencecomponents Proxy Server Client Capture DNS requests for Kubernetes resources DNS resolution for Kubernetes resources Proxy TCP connections to cluster Proxy TCP connections to laptop Canonical DNS for Kubernetes resources
  • 29. @danielbryantuk | @datawireio 29 TelepresenceClient Use kubectl port-forward to bootstrap sshuttle (ssh-based VPN) sshuttle has a lot of functionality that is not used by Telepresence (it’s a VPN, after all) Replace sshuttle with something else — designed for Kubernetes • Capture DNS locally • Do DNS resolution intelligently • Redirect TCP connections to the right destination Already in progress, will replace VPN-TCP method Also support multiple simultaneous swaps
  • 30. @danielbryantuk | @datawireio 30 TelepresenceProxyServer Currently deployed every time you do a swap-deployment (and then deleted) Switch mode to be persistent (this is what Kubernetes is good for) • Speeds up startup • Support reconnect
  • 31. @danielbryantuk | @datawireio 31 Multi-UserDevelopment Swap deployment doesn’t work well for multi-user development Solution today is to use namespaces and/or individual clusters • Expensive (more hardware & setup) • Delays integration testing until after commit
  • 32.
  • 35. @danielbryantuk | @datawireio 35 ContributingtoTelepresence Documentation and workflows * how you integrate Telepresence into your development workflow Let us know if you’re a user! Triage * Lots of folks use GitHub for support, which doesn’t scale well Join Slack to help other users https://d6e.co/slack #telepresence
  • 36. @danielbryantuk | @datawireio 36 Thankyou!Questions? db@datawire / @danielbryantuk www.telepresence.io https://github.com/telepresenceio More KubeCon sessions — 17:20 Today!! * “Use Your Favorite Developer Tools in Kubernetes With Telepresence” by Abhay Saxena in Room 30ABCDE Visit us at Booth #S46 Sign up for the Ambassador Edge Stack preview * https://www.getambassador.io/early-access