https://github.com/cloudacademy/web-echo-app

Web Echo App
https://github.com/cloudacademy/web-echo-app

app cloudacademy container devops docker go kubernetes web

Last synced: about 1 year ago
JSON representation

Web Echo App

• Host: GitHub
• URL: https://github.com/cloudacademy/web-echo-app
• Owner: cloudacademy
• Created: 2022-09-15T21:32:14.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2023-11-15T03:41:35.000Z (over 2 years ago)
• Last Synced: 2025-01-13T06:07:16.113Z (over 1 year ago)
• Topics: app, cloudacademy, container, devops, docker, go, kubernetes, web
• Language: Go
• Homepage:
• Size: 63.5 KB
• Stars: 0
• Watchers: 4
• Forks: 3
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

README

          
![Build Status](https://github.com/cloudacademy/web-echo-app/actions/workflows/go.yml/badge.svg) 

![GitHub release (latest SemVer)](https://img.shields.io/github/v/release/cloudacademy/web-echo-app)

# Web Echo App

A simple web based application that prints a message on a coloured background, both of which can be configured using environment variables.

## Usage

To start the web application, configure the following optional environment variables:

 - `HOSTPORT=0.0.0.0:8080`

 - `MESSAGE="CloudAcademy ❤ DevOps"`

 - `BACKGROUND_COLOR=yellow`

 - `AUTO_RELOAD=30`

## Build

The following commands can be used to build and package the source code:

Current operating system:

```

go build .

```

**Linux** operating system:

```

CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o webapp

```

**macOS** operating system:

```

CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -o webapp

```

Docker:

```

docker buildx build --platform=linux/amd64 -t cloudacademydevops/webappecho .

```

## Startup:

Example 1:

```

./webapp

```

Example 2:

```

HOSTPORT=0.0.0.0:8080 MESSAGE="CloudAcademy ❤ DevOps" BACKGROUND_COLOR=cyan ./webapp

```

Example 3:

```

HOSTPORT=0.0.0.0:8080 MESSAGE="CloudAcademy ❤ DevOps" BACKGROUND_COLOR=yellow AUTO_RELOAD=30 ./webapp

```

![webapp](./docs/webapp.png)

## Docker

The web application has been packaged into a Docker image. The Docker image can be pulled with the following command:

```

docker pull cloudacademydevops/webappecho

```

Use the following command to launch the web echoing application within Docker:

```

docker run --name webapp \

--env MESSAGE=CloudAcademy \

--env BACKGROUND_COLOR=yellow \

--env AUTO_RELOAD=30 \

-p 8080:8080 cloudacademydevops/webappecho

```

## Kubernetes

Use the following command to launch the web echoing application as a Deployment resource within a cluster:

```

cat << EOF | kubectl apply -f -

apiVersion: apps/v1

kind: Deployment

metadata:

  name: webecho

  namespace: cloudacademy

  labels:

    app: webecho

    version: v1

spec:

  replicas: 2

  selector:

    matchLabels:

      app: webecho

      version: v1

  template:

    metadata:

      labels:

        app: webecho

        version: v1

    spec:

      containers:

      - name: webecho

        image: cloudacademydevops/webappecho

        imagePullPolicy: IfNotPresent

        command: ["/go/bin/webapp"]

        ports:

        - containerPort: 8080

        env:

        - name: MESSAGE

          value: "CloudAcademy ❤ DevOps"

        - name: BACKGROUND_COLOR

          value: yellow

        - name: AUTO_RELOAD

          value: 30

EOF

```