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Docker Compose

Features

• manages the whole app lifecycle -- start, stop, and rebuilding services -- view status of running services -- stream the log output of running services -- run a one-off command on a service

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Container Linking

• this is very useful if you have an app image that needs to communicate w/ 1 or more other containers (things like a web server, database(s), other app servers, etc)

Linking containers by name (legacy linking)

Steps

1. Run container w/ a name using cmd line switch

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FROM mcr.microsoft.com/dotnet/core/sdk

LABEL key="Kyle Morton"

ENV ASPNETCORE_URLS=http://*:5000
ENV DOTNET_USE_POLLING_FILE_WATCHER=1
ENV ASPNETCORE_ENVIRONMENT=development

WORKDIR /app

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FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-nanoserver-1909 AS base
WORKDIR /app
EXPOSE 5000

FROM mcr.microsoft.com/dotnet/core/sdk:3.1-nanoserver-1909 AS build
WORKDIR /src
COPY ["docker-mvc.csproj", "./"]
RUN dotnet restore "./docker-mvc.csproj"
COPY . .
WORKDIR "/src/."

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Dockerfile

Dockerfiles represent a way to create an image w/ a layered file system using 1 or more existing images along w/ steps to build/copy files and dependencies.

Creating a customer ASP.NET Core Dockerfile

Easy way to autogenerate a production ready .dockerfile in VS Code -

1. open project folder in vscode
2. install both the docker & C# (omnisharp) extensions

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Key Docker Commands

IMAGES

docker pull [image-name]

• pull image onto machine

docker images

• list images on your machine

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var strCmdText = "/C youtube-dl -i --extract-audio --audio-format mp3 --audio-quality 0 {YOUTUBE_URL};
System.Diagnostics.Process.Start("CMD.exe", strCmdText);

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import UIKit

var str = "Hello, playground"

func sayTitle(title: String) {
    print("Title: \(title)")
}

class Movie {
    var title: String?