Docker Fundamentals & Container Basics (Multi-Lang Hello World)

go/Dockerfile

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+FROM ubuntu:22.04
+
+# Install Go
+RUN apt-get update && \
+    apt-get install -y wget tar git build-essential && \
+    wget https://go.dev/dl/go1.21.1.linux-amd64.tar.gz && \
+    tar -C /usr/local -xzf go1.21.1.linux-amd64.tar.gz && \
+    rm go1.21.1.linux-amd64.tar.gz
+
+# Tambahkan Go ke PATH
+ENV PATH="/usr/local/go/bin:${PATH}"
+
+# Buat direktori kerja
+WORKDIR /app
+
+# Salin source code
+COPY main.go .
+
+# Compile Go ke binary
+RUN go build -o hello main.go
+
+# Jalankan binary
+CMD ["./hello"]
+

go/main.go

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+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func main() {
+	for {
+		fmt.Println("Hello from Go Inside Docker!")
+		time.Sleep(5 * time.Second)
+	}
+}
+

java/Dockerfile

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+FROM ubuntu:22.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install OpenJDK dan tools dasar
+RUN apt-get update && \
+    apt-get install -y openjdk-17-jdk && \
+    apt-get clean
+
+# Set direktori kerja
+WORKDIR /app
+
+# Salin file java
+COPY Hello.java .
+
+# Compile file Java
+RUN javac Hello.java
+
+# Jalankan program
+CMD ["java", "Hello"]
+

java/Hello.java

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+public class Hello {
+	public static void main(String[] args) {
+		System.out.println("Hello from Java Inside Docker!");
+		
+		while (true) {
+			System.out.println("App is running...");
+			try {
+				Thread.sleep(5000);
+			} catch (InterruptedException e) {
+				System.out.println("Loop interrupted");
+				break;
+			}
+		}
+	}
+}

node/Dockerfile

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+FROM ubuntu:22.04
+
+# Install curl, Node.js, dan npm
+RUN apt-get update && \
+    apt-get install -y curl && \
+    curl -fsSL https://deb.nodesource.com/setup_18.x | bash - && \
+    apt-get install -y nodejs
+    
+# Buat direktori kerja
+WORKDIR /app
+
+# Salin file aplikasi
+COPY app.js .
+
+# Jalankan app.js
+CMD ["node", "app.js"]
+

node/app.js

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+console.log("Starting loop...");
+
+setInterval(() => {
+	console.log("App is running...");
+}, 5000);

node/package.json

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+{
+	"name": "hello-node",
+	"version": "1.0.0",
+	"main": "app.js",
+	"scripts": {
+		"start": "node app.js"
+	}
+}

python/Dockerfile

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+FROM ubuntu:20.04
+
+# Non-interaktif untuk menghindari prompt saat install
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install Python
+RUN apt-get update && \
+    apt-get install -y python3 && \
+    apt-get clean
+
+WORKDIR /app
+COPY app.py .
+
+CMD ["python3", "app.py"]

python/app.py

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+# app.py
+import time
+
+print("Starting loop...")
+
+while True:
+    print("App is running...")
+    time.sleep(5)