3 exercises

.github/workflows/exec_bash_exercise.yml

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+name: Release exec_bash_exercise
+
+on:
+  push:
+    branches: 
+      - master
+    paths:
+      - 'exec_bash_exercise_and_first_volume_exercise/**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Publish to Registry
+      uses: elgohr/Publish-Docker-Github-Action@master
+      env:
+        SECRET_MESSAGE: ${{ secrets.EXEC_BASH_EXERCISE_SECRET_MESSAGE }}
+      with:
+        name: jakousa/exec_bash_exercise
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+        tags: latest
+        buildargs: SECRET_MESSAGE
+        context: exec_bash_exercise_and_first_volume_exercise

.github/workflows/first_volme_exercise.yml

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+name: Release first_volume_exercise
+
+on:
+  push:
+    branches: 
+      - master
+    paths:
+      - 'exec_bash_exercise_and_first_volume_exercise/**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Publish to Registry
+      uses: elgohr/Publish-Docker-Github-Action@master
+      env:
+        SECRET_MESSAGE: ${{ secrets.FIRST_VOLUME_EXERCISE_SECRET_MESSAGE }}
+      with:
+        name: jakousa/first_volume_exercise
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+        tags: latest
+        buildargs: SECRET_MESSAGE
+        context: exec_bash_exercise_and_first_volume_exercise

.github/workflows/ports_exercise.yml

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+name: Release ports_exercise
+
+on:
+  push:
+    branches: 
+      - master
+    paths:
+      - 'ports_exercise/**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Publish to Registry
+      uses: elgohr/Publish-Docker-Github-Action@master
+      with:
+        name: jakousa/ports_exercise
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+        tags: latest
+        context: ports_exercise

exec_bash_exercise_and_first_volume_exercise/Dockerfile

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+FROM node:dubnium
+
+ARG SECRET_MESSAGE
+ENV SECRET_MESSAGE=$SECRET_MESSAGE
+
+WORKDIR /usr/app
+COPY . .
+
+CMD ["node", "index"]

exec_bash_exercise_and_first_volume_exercise/README.md

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+Writes "secret message" to file every 15 seconds. Otherwise logs time.

exec_bash_exercise_and_first_volume_exercise/index.js

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+const fsPromises = require('fs').promises
+
+const SECRET_MESSAGE = process.env.SECRET_MESSAGE
+const filePath = `${__dirname}/logs.txt`
+let rounds = 0
+let filehandle
+
+const printTimeToFile = async () => {
+  const startTime = new Date().getTime()
+  if (filehandle === undefined) {
+    try {
+      filehandle = await fsPromises.open(filePath, 'w')
+    } catch (err) {
+      console.error('Failed to open file', filePath, err)
+      return
+    }
+  }
+  rounds++
+  const GMTString = new Date().toGMTString()
+  const writeString = (rounds % 5 === 0) ? `Secret message is:\n"${SECRET_MESSAGE}"` : GMTString
+  try {
+    await filehandle.appendFile(`${writeString}\n`)
+    console.log(`Wrote to file ${filePath}`)
+  } catch (err) {
+    console.error('Failed to write to file', err)
+  }
+
+  const timeNow = new Date().getTime()
+  setTimeout(printTimeToFile, 3000 - (timeNow - startTime))
+}
+
+printTimeToFile()
+
+const gracefulClose = async () => {
+  if (filehandle !== undefined) console.log('Closing file') && await filehandle.close()
+  process.exit(0)
+}
+
+process.on('SIGTERM', gracefulClose)
+process.on('SIGINT', gracefulClose)
+
+

ports_exercise/Dockerfile

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+FROM node:alpine
+
+WORKDIR /usr/app
+
+COPY package* ./
+RUN npm ci
+COPY . .
+
+CMD ["npm", "start"]

ports_exercise/index.js

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+const express = require("express")
+
+const app = express()
+
+const PORT = 80
+
+app.get('*', (req, res) => res.send('Ports configured correctly!!').end())
+
+app.listen(PORT, () =>
+  console.log(`Listening on port ${PORT}, this means inside of the container. Use -p to map the port to a port of your local machine.`))