Korean, Edit

Docker Usage

Recommended Reading: 【Development Environment】 Operating System Index

1. Overview

2. Commands

3. Miscellaneous

1. Overview

⑴ Overview

① (Differentiating Concept) environment: A bundle where packages are stored

② docker: A container that not only stores packages but also instances that are the intermediate results of computations

③ Official Manual

⑵ Input Files

① Dockerfile: A set of Docker commands

○ Concept similar to source code. The file name must be ‘Dockerfile’

○ If using docker attach, must use SHELL commands

○ RUN: Installs during the creation of the image

○ CMD: Installs only once when the image is turned into a container (when the image is executed)

○ ENTRYPOINT: Like running jupyter

② build-image.sh: A set of Linux commands

③ docker-compose.yml: Configuration environment variables

④ app.py: Python executable file

⑤ requirements.txt: Required Python packages

⑶ Docker Creation Results

① image = blueprint

○ A blueprint with all the necessary packages and libraries installed for the desired project or functionality, along with various settings and initial values

○ Can be downloaded from https://hub.docker.com/

○ Examples: linux/amd64 python:3.9, linux/amd64 nvidia/cuda:11.2.2-cudnn8-devel-ubuntu20.04

② container = instance

○ The instance that is actually run or deployed by the user on the host, based on the image

③ node or host

○ The device or environment running Docker

2. Commands

○ Install Docker

○ Step 1. Install docker-ce

# For Ubuntu
sudo apt update
sudo apt install apt-transport-https ca-certificates curl software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt update
sudo apt install docker-ce

# For CentOS
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
sudo yum install docker-ce

# For Fedora
sudo dnf -y install dnf-plugins-core
sudo dnf config-manager --add-repo https://download.docker.com/linux/fedora/docker-ce.repo
sudo dnf install docker-ce 

○ Step 2. Start docker

sudo systemctl start docker

○ Step 3. (Optional) Enable docker to start on boot

sudo systemctl enable docker

○ Step 4. Verify docker installation

sudo docker --version

○ Step 5. Run a container

# run a test container
sudo docker run hello-world

# run my new container 'jb'
sudo docker run -dit --name jb ubuntu

○ Step 6. Pull an image: Followed by the repository URL and image tag

sudo docker pull ubuntu:20.04

○ Step 7. Run a container from the image

sudo docker run -it --name my_container_name ubuntu:20.04 /bin/bash

○ Docker Commands:

○ docker images: List Docker images.

○ docker build: Generates a Docker container.

○ docker run: Executes a Docker container.

○ docker ps: List Docker containers. When you run docker ps -a, you can also see stopped containers.

○ docker attach Container_ID: Enter a specific Docker container.

○ docker exec Container_ID: Passes commands to a running Docker container. Almost similar to docker attach.

○ docker stats: Check the resources allocated to each container.

○ docker stop ID: Stop a specific container.

○ docker start ID: Start a specific container.

○ docker rm ID: Remove a specific container.

○ docker rmi ID: Remove a specific Docker image. Containers that use the image must be removed first.

○ docker cp <CONTAINER_ID>:<CONTAINER_PATH> <HOST_PATH>: Copy files from inside the container to the host.

○ docker cp <HOST_PATH> <CONTAINER_ID>:<CONTAINER_PATH>: Copy files from the host to the container.

○ Shortcuts:

○ ctrl + c: When a specific Docker container is active, pressing this key combination will stop that Docker container.

○ ctrl + p + q: When a specific Docker container is active, pressing this key combination will detach from the active Docker container.

3. Miscellaneous

⑴ Docker Web GUI Management Tool

Input: 2023.06.03 01:28