https://github.com/cjimti/go-echo

TCP echo server.
https://github.com/cjimti/go-echo

docker docker-container docker-image echo golang kubernetes tcp tcp-server testing-tools

Last synced: 5 months ago
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TCP echo server.

• Host: GitHub
• URL: https://github.com/cjimti/go-echo
• Owner: cjimti
• License: mit
• Created: 2018-03-29T16:16:26.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2018-03-30T03:49:15.000Z (about 8 years ago)
• Last Synced: 2025-05-05T04:53:07.764Z (11 months ago)
• Topics: docker, docker-container, docker-image, echo, golang, kubernetes, tcp, tcp-server, testing-tools
• Language: Go
• Size: 11.7 KB
• Stars: 22
• Watchers: 2
• Forks: 12
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
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# GO (TCP) Echo

A Simple go TCP echo server. Written to learn and test [Kubernetes] TCP networking.

## Test with [Docker]

Run the container from a terminal:

```bash

docker run --rm -it -e TCP_PORT=2701 -e NODE_NAME="EchoNode" -p 2701:2701 cjimti/go-echo

```

In another terminal run:

```bash

telnet localhost 2701

```

## Test with [Kubernetes]

```bash

cd k8s

kubectl create -f . 

```

You should now have two TCP echo containers running:

```bash

kubectl get pods --selector=app=tcp-echo

```

```bash

NAME                                   READY     STATUS    RESTARTS   AGE

tcp-echo-deployment-777d856787-5fhb4   1/1       Running   0          27s

tcp-echo-deployment-777d856787-rh9tp   1/1       Running   0          27s

```

You should also have a service that connection port 32701 to the pods:

```bash

kubectl get service --selector=app=tcp-echo-service

```

```bash

NAME               TYPE       CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE

tcp-echo-service   NodePort   10.102.207.113           2701:32701/TCP   35m

```

Echo some data, replace ANY_NODE_IP with a location of a node:

```

telnet ANY_NODE_IP 32701

```

After connecting, type the word hello and hit return:

```bash

Trying x.x.x.x...

Connected to node1.example.com.

Escape character is '^]'.

Welcome, you are connected to node node1.example.com.

Running on Pod tcp-echo-deployment-777d856787-rh9tp.

In namespace default.

With IP address 192.168.33.39.

Service default.

hello

hello

```

## Resources

- [Expose Pod Information to Containers Through Environment Variables]

- [Docker]

- [Kubernetes]

[Expose Pod Information to Containers Through Environment Variables]: https://kubernetes.io/docs/tasks/inject-data-application/environment-variable-expose-pod-information/

[Docker]: https://www.docker.com/

[Kubernetes]: https://kubernetes.io/