---
tags: Docker
---
# [1] Docker for newbie

What is Docker?

Docker is an open-source platform for building, deploying, and managing containerized applications.

- image
- container

---

dockerhub : a place of storing images

## Category

### Action

- docker pull / docker push / docker commit
- docker build : Build an image from a dockerfile. (Advance)
- docker run : Create a container (It can only run once.)
- docker exec : (If you have not created it before, you cannot use it.) Enter a container
- docker start / docker stop : Start a container, and stop a container
- docker rm / docker rmi
- docker cp

### Check status

- docker ps (Check the status of containers that is currently running) / docker ps -a (Check all containers)
- docker images (check all images) / docker image ls
- docker info

---
## Command

### 1. Docker pull

>The purpose is to pull the **image**.

docker pull (Account):(Tag & version) 

Ex:

docker pull ubuntu:20.04

If you do not specify the version you wanna pull, then it will pull the tag of latest version by default.

### 2. Docker run

>The purpose is to create a container from an **image**.

The main framework:

docker run (options) (image name) (command)

For example:

docker run (options) ubuntu:20.04 bash

**Options:**

All of options should be put between `run` and `image name`.

- `-i -t` (i.g., `-it`) : `-i` represents "interactive" and `-t` is `--tty`.
- `--name` : give a name. (We cannot use the same name.)
- `--rm` : Won't store it after you leave a container.
- `-p` (port) (host):(container) 8080:8080
- `-v` (volume): Mount the folder (host folder absolute path):(container path)
- `-d` : background (The meaning of `-d` is "detach")

### 3. Docker exec (execute)

>The purpose is to enter an alive container. (or a running container)

docker exec (options) (container name) (command)

### 4. Docker commit

>The purpose is to commit a container be a version.

docker commit (container ID) (image name)

Ex:

docker commit chieh chiehpower:0.1

### 5. Docker tag

>The purpose is to change the image name.

### 6. Docker cp

>The purpose is to copy the files to your destination.

docker cp (target) (destination)

(container name):(path)

Ex:

- Copy the `test.py` file from "chieh" container to host (here).

docker cp chieh:/workspace/test.py .

- Copy the `test.py` file from host to the `/workspace/test.py` location of "chieh" container.

docker cp test.py chieh:/workspace/test.py

## Slide

- [Slide](https://docs.google.com/presentation/d/e/2PACX-1vQ1HcRWegNDMkDKT0hqQPLlglmx3CGf_upObi7jt7QuCvSELfJrZpgT1mR57Q7IC9efc766AMk5Mc-0/pub?start=false&loop=false&delayms=3000)

### how to push to dockerhub and docker tag rule