Docker

Description:

• Container Runtime
• .
  • Docker container
  • Docker image
  • Docker CLI

Docker Engine

Docker Build

Core concepts:

Overview:

• Client: Buildx is the client and the user interface for running and managing builds.
• Server: BuildKit is the server, or builder, that handles the build execution.

Dockerfile

Build context:

• .

Building

Multi-stage

• Use multi-stage builds
  • use multiple FROM statements in your Dockerfile.
  • Each FROM instruction can use a different base, and each of them begins a new stage of the build

  •   # syntax=docker/dockerfile:1
      FROM golang:1.24
      WORKDIR /src
      COPY <<EOF ./main.go
      package main
      
      import "fmt"
      
      func main() {
        fmt.Println("hello, world")
      }
      EOF
      RUN go build -o /bin/hello ./main.go
      
      FROM scratch
      COPY --from=0 /bin/hello /bin/hello
      CMD ["/bin/hello"]

• Name build stages:
  • FROM golang:1.24 AS build
  • COPY --from=build /bin/hello /bin/hello
• To stop at a specific build stage:
  • docker build
  • docker build --target build -t hello .

Docker Compose