Run a local process in Kubernetes with Telepresence
This repository contains two Node.js applications.
- echo-server a server which returns status messages.
- task-runner a client which calls the
echo-serverevery 3 seconds.
The corresponding article to this repository was published on the Coder Society blog.
1. Clone the repository
$ git clone https://github.com/coder-society/kubernetes-with-telepresence 2. Run the echo-server
$ node ./echo-server/server.js Echo Server listening on http://localhost:3000 3. Make a request to the status route
$ curl http://localhost:3000 {"status":"ok","time":1504645235278,"hostname":"kewa.local"} 4. Deploy to Kubernetes
Deploy the two apps to Kubernetes by applying the manifest files.
$ kubectl apply -f ./echo-server/echo-server.yaml deployment "echo-server" created service "echo-server" created $ kubectl apply -f ./task-runner/task-runner.yaml deployment "task-runner" created 5. Run the task-runner locally without Telepresence
$ node ./task-runner/index.js getaddrinfo ENOTFOUND echo-server echo-server:80 getaddrinfo ENOTFOUND echo-server echo-server:80 getaddrinfo ENOTFOUND echo-server echo-server:80 You can't connect to the echo-server, because it's not publicly available.
6. Run the task-runner locally with Telepresence
$ telepresence --run node task-runner/index.js ... {"status":"ok","time":1504647042810,"hostname":"echo-server-1203620631-fpfvw"} {"status":"ok","time":1504647043491,"hostname":"echo-server-1203620631-swsk5"} {"status":"ok","time":1504647046640,"hostname":"echo-server-1203620631-fpfvw"} This shows that you can connect to the echo-server although it's not publicly exposed.