Introduction to Telepresence with Kubernetes
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Telepresence allows developers to test applications locally that are deployed to Kubernetes clusters. It creates a network proxy between a local development environment and a pod running in the cluster, enabling local development and testing that reflects the cluster environment. Key features include deploying and debugging services locally without changing code in the cluster. The document provides an overview of Telepresence and examples for installing it and using it to swap a deployment for local development of both a Python HTTP server and Docker container-based application.
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Introduction to Telepresence with Kubernetes
- 2. Kyohei Mizumoto(@kyohmizu) C# Software Engineer Interests Docker/Kubernetes Go Security whoami
- 3. Required Knowledge Basic knowledge of kubernetes Goals Understand: the concept of telepresence how to test application with Telepresence
- 4. Contents Overview What is Telepresence? Features Get Started Install Telepresence Examples (Demo)
- 5. Overview
- 6. https://www.telepresence.io/ Local development against a remote Kubernetes cluster OSS hosted by CNCF The Sandbox project Enables developers to do fast and easy test/debug of a service What is Telepresence?
- 9. Features With Telepresence, developers can: Deploy a service locally in the same condition as a Kubernetes cluster Use any tool installed locally to test/debug/edit a service Swap a service running on a cluster for a local service
- 10. How it works https://www.telepresence.io/discussion/how-it-works Telepresence builds a network-proxy between: a custom pod running inside a Kubernetes cluster a process running on your development machine
- 11. Get Started
- 12. Install Telepresence https://www.telepresence.io/reference/install On Ubuntu, run the following: $ curl -s https://packagecloud.io/install/repositories/→ datawireio/telepresence/script.deb.sh | sudo bash $ sudo apt install --no-install-recommends telepresence # Verify the Installation $ telepresence --version
- 13. Quick Start https://github.com/telepresenceio/telepresence # Verify the connection to the Kubernetes cluster $ kubectl get no NAME STATUS ROLES AGE VERSION aks-default-09796230-0 Ready agent 43h v1.13.12 aks-default-09796230-1 Ready agent 43h v1.13.12 # Start a shell that proxies connections to Kubernetes # Needs to enter the sudo password $ telepresence
- 14. Example $ cat hello-world-deploy.yaml apiVersion: apps/v1 kind: Deployment metadata: labels: app: hello-world name: hello-world spec: replicas: 1 selector: matchLabels: app: hello-world template: metadata: labels: app: hello-world spec: containers: - image: datawire/hello-world name: hello-world ports: - containerPort: 8000
- 15. Example https://www.telepresence.io/tutorials/kubernetes # Deploy a service in the Kubernetes cluster $ kubectl apply -f hello-world-deploy.yaml deployment.apps/hello-world created $ kubectl expose deployment hello-world --type=LoadBalancer --port=8000 --target-port=8000 --name=hello-world service/hello-world exposed $ kubectl get po | grep hello-world hello-world-645b769fd4-pxh8l 1/1 Running 0 3m52s $ kubectl get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE hello-world LoadBalancer 10.0.181.195 104.46.217.233 8000:31793/TCP 4m49s
- 16. Example # Send a query to a service running in the cluster $ export HELLOWORLD=http://104.46.217.233:8000 $ curl $HELLOWORLD Hello, world! or display in web browser
- 17. Example # Set up a development environment $ mkdir telepresence; cd telepresence $ echo "hello from your laptop" > file.txt $ ls file.txt # Test locally $ python3 -m http.server 8001 & [1] 47404 $ curl http://localhost:8001/file.txt hello from your laptop $ kill %1
- 18. Example # Swap the deployment with Telepresence $ telepresence --swap-deployment hello-world --expose 8000 --run python3 -m http.server 8000 & # A pod is swapped $ kubectl get po | grep hello-world hello-world-7c2fc81aaad6400bae6c760f74be47cb-59db7d4c9b-7ll2r 1/1 Running 0 5m28s # Send a query to a service $ curl $HELLOWORLD/file.txt hello from your laptop or display in web browser
- 19. Example # Finish swapping # Kill Telepresence locally $ fg ^C # New pod is created $ kubectl get po | grep hello-world hello-world-645b769fd4-tvsr6 1/1 Running 0 8s
- 20. Example (Docker) https://www.telepresence.io/tutorials/docker # Get a sample from GitHub $ git clone https://github.com/datawire/hello-world $ cd hello-world $ ls Dockerfile LICENSE README.md requirements.txt server.py
- 21. Example (Docker) # Fix a dependency problem $ git diff requirements.txt diff --git a/requirements.txt b/requirements.txt index a938e09..16b0f08 100644 --- a/requirements.txt +++ b/requirements.txt @@ -3,4 +3,4 @@ Flask==1.0.2 itsdangerous==1.1.0 Jinja2==2.10 MarkupSafe==1.1.1 -Werkzeug==0.15.2 +Werkzeug==0.15.6 # Build a docker image $ sudo docker build -t hello-dev .
- 22. Example (Docker) $ sudo docker image ls | grep hello-dev hello-dev latest 4ef6bfec0bdb 2 hours ago 122MB # Swap a service for a docker container running locally $ telepresence --swap-deployment hello-world --docker-run --rm -it -v $(pwd):/usr/src/app hello-dev $ curl http://104.46.217.233:8000 Hello, world! # Modify server.py $ sed -i.bak -e s/Hello/Greetings/ server.py $ curl http://104.46.217.233:8000 Greetings, world!
- 23. Example (Docker) # 2 docker containers are running locally $ sudo docker container ls CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES e9fc5e0f7ddc hello-dev "python3 ./server.py" 8 minutes ago Up 8 minutes telepresence-1573198861-6937146-39240 1851864adb52 datawire/telepresence-local:0.103 "/sbin/tini -v -- py…" 8 minutes ago Up 8 minutes 127.0.0.1:41695->38022/tcp telepresence-1573198854-7027166-39240
- 25. Thank you!