Developing and debugging services locally
Kubernetes applications usually consist of multiple, separate services, each running in its own container. Developing and debugging these services on a remote Kubernetes cluster can be cumbersome, requiring you to get a shell on a running container in order to run debugging tools.
telepresence is a tool to ease the process of developing and debugging services locally while proxying the service to a remote Kubernetes cluster. Using
telepresence allows you to use custom tools, such as a debugger and IDE, for a local service and provides the service full access to ConfigMap, secrets, and the services running on the remote cluster.
This document describes using
telepresence to develop and debug services running on a remote cluster locally.
Before you begin
- Kubernetes cluster is installed
kubectlis configured to communicate with the cluster
- Telepresence is installed
Connecting your local machine to a remote Kubernetes cluster
telepresence connect to launch it's Daemon and connect your local workstation to the cluster.
$ telepresence connect Launching Telepresence Daemon ... Connected to context default (https://<cluster public IP>)
You can curl services using the Kubernetes syntax e.g.
curl -ik https://kubernetes.default
Developing or debugging an existing service
When developing an application on Kubernetes, you typically program or debug a single service. The service might require access to other services for testing and debugging. One option is to use the continuous deployment pipeline, but even the fastest deployment pipeline introduces a delay in the program or debug cycle.
telepresence intercept $SERVICE_NAME --port $LOCAL_PORT:REMOTE_PORT command to create an "intercept" for rerouting remote service traffic.
$SERVICE_NAMEis the name of your local service
$LOCAL_PORTis the port that your service is running on your local workstation
$REMOTE_PORTis the port your service listens to in the cluster
Running this command tells Telepresence to send remote traffic to your local service instead of the service in the remote Kubernetes cluster. Make edits to your service source code locally, save, and see the corresponding changes when accessing your remote application take effect immediately. You can also run your local service using a debugger or any other local development tool.
How does Telepresence work?
Telepresence installs a traffic-agent sidecar next to your existing application's container running in the remote cluster. It then captures all traffic requests going into the Pod, and instead of forwarding this to the application in the remote cluster, it routes all traffic (when you create a global intercept) or a subset of the traffic (when you create a personal intercept) to your local development environment.
If you're interested in a hands-on tutorial, check out this tutorial that walks through locally developing the Guestbook application on Google Kubernetes Engine.
For further reading, visit the Telepresence website.
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