echo hello | docker run --rm -i busybox cat

# Ответ команды
hello

docker run --rm -i busybox echo "foo bar baz" \
  | docker run --rm -i busybox awk '{ print $2 }' \
  | docker run --rm -i busybox rev

# Ответ команды
rab

docker volume prune

# Сразу же ловим АХТНУГ и запрос на подтверждение операции
WARNING! This will remove anonymous local volumes not used by at least one container.
Are you sure you want to continue? [y/N] y
Deleted Volumes:
07c7bdf3e34ab76d921894c2b834f073721fccfbbcba792aa7648e3a7a664c2e
my-named-vol

Total reclaimed space: 36 B

Сидим с бобром за компом, к релизу готовим контейнер с nginx-ом.

# Пускаем контейнер
docker run -d --name my_container nginx

# Смотрим, какие процессы запущены внутри контейнера
docker top my_container

UID                 PID                 PPID                C                   STIME               TTY                 TIME                CMD
root                12345               12344               0                   00:00               ?                   00:00:00            nginx: master process nginx -g daemon off;
101                 12346               12345               0                   00:00               ?                   00:00:00            nginx: worker process

docker init

Welcome to the Docker Init CLI!

This utility will walk you through creating the following files with sensible defaults for your project:
  - .dockerignore
  - Dockerfile
  - compose.yaml
  - README.Docker.md

Let's get started!

? What application platform does your project use?  [Use arrows to move, type to filter]
PHP with Apache - (detected) suitable for a PHP web application
  Go - suitable for a Go server application
  Java - suitable for a Java application that uses Maven and packages as an uber jar
  Python - suitable for a Python server application
  Node - suitable for a Node server application
  Rust - suitable for a Rust server application
  ASP.NET Core - suitable for an ASP.NET Core application
  Other - general purpose starting point for containerizing your application
  Don't see something you need? Let us know!
  Quit

# Базовый образ
FROM ubuntu:20.04

# Добавляем метаданные
LABEL maintainer="Senpai <senpai@devops.com>"
LABEL version="1.0"
LABEL denoscription="Это образ для веб-приложения на базе Ubuntu 20.04"

# Установка необходимых пакетов
RUN apt-get update && apt-get install -y nginx

# Копируем файл конфигурации
COPY nginx.conf /etc/nginx/nginx.conf

# Запускаем Nginx
CMD ["nginx", "-g", "daemon off;"]

docker run -it nginx /bin/bash

docker exec -it my_container /bin/bash

# Запускаем контейнер с политикой перезапуска
docker run --restart=always mywebserver

docker run -m 512m nginx
docker run --memory=2g my_heavy_app