> For the complete documentation index, see [llms.txt](https://cutejaneii.gitbook.io/docker/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cutejaneii.gitbook.io/docker/lets-docker/docker-shi-zuo-ying.md).
# Docker實作營
## 實作步驟及摘要
1 環境準備
2 搜尋並取得映像檔
3 利用映像檔建立容器
* 網路設定
* 建立容器時，使用網路預設值（即bridge）
* 建立容器時，設定port mapping
* 建立容器時，使用host network
* 同步容器資料
* 同步本機資料
* 傳入環境變數
4 撰寫及使用Dockerfile
* git clone from Github
* 調整Dockerfile後，建立映像檔
5 Docker Compose
6 Docker Push到倉庫
## 實作1 環境準備
* 申請Docker帳號（）
* 登入`Play with Docker`（）
* 按下`Start`開始
* 按下左邊的 `+ ADD NEW INSTANCE`，即可開始作業
## 實作2 搜尋並取得映像檔
用`docker search`搜尋`nginx`
```
$ docker search nginx
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
nginx Official build of Nginx. 13505 [OK]
jwilder/nginx-proxy Automated Nginx reverse proxy for docker con… 1841 [OK]
richarvey/nginx-php-fpm Container running Nginx + PHP-FPM capable of… 780 [OK]
linuxserver/nginx An Nginx container, brought to you by LinuxS… 122
bitnami/nginx Bitnami nginx Docker Image 87 [OK]
tiangolo/nginx-rtmp Docker image with Nginx using the nginx-rtmp… 85 [OK]
jc21/nginx-proxy-manager Docker container for managing Nginx proxy ho… 72
alfg/nginx-rtmp NGINX, nginx-rtmp-module and FFmpeg from sou… 71 [OK]
```
* 在`Docker Hub`搜尋`nginx`，並過濾`tag = 1.13-alpine`，找到`docker pull`指令
* 執行`docker pull nginx:1.13-alpine`下載`nginx`映像檔
## 實作3 利用映像檔建立容器
* 利用`docker pull`下載`cutejaneii/docker.python_demo`映像檔
* 將上述映像檔，再上一個新的tag : `myapp`
* 利用`docker images`查看所有映像檔
* 用`myapp`映像檔建立容器
* 建立容器時，使用網路預設值（即bridge）
* 建立容器時，設定port mapping
* 建立容器時，使用host network
建立完成後，可用`curl`測試看看是否成功
```
$ curl 127.0.0.1:8080
Hello World! (Python 2.7.16) everyone!!
$ curl 127.0.0.1:80
Hello World! (Python 2.7.16) everyone!!
```
* 同步容器資料
* 同步本機資料
本機建立一個app資料夾，加入以下的main.py，再用-v的方式建立容器，`docker run -d -p 8888:80 -v /app:/app myapp`
```
import os
from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello():
return "Good Morning!!!!! " + os.environ['owner']
if __name__ == "__main__":
app.run(host="0.0.0.0", debug=True, port=80)
```
最後用`curl`測試看看是否成功
```
$ curl 127.0.0.1:8888
Good Morning!!!!! everyone!!
```
* 傳入環境變數 `docker run -d -p 9999:80 -e "owner=Jennifer" myapp`
用`curl`測試看看是否成功
```
$ curl 127.0.0.1:9999
Hello World (Python 2.7.16) Jennifer
```
## 實作4 撰寫及使用Dockerfile
* git clone from Github
```
$ git clone https://github.com/cutejaneii/docker.python_demo.git
Cloning into 'docker.python_demo'...
remote: Enumerating objects: 10, done.
remote: Counting objects: 100% (10/10), done.
remote: Compressing objects: 100% (7/7), done.
Receiving objects: 100% (10/10), done.
remote: Total 10 (delta 1), reused 0 (delta 0), pack-reused 0
Resolving deltas: 100% (1/1), done.
```
* 調整Dockerfile後，建立映像檔
```
$ docker build -t myapp .
```
## 實作5 Docker Compose
撰寫docker-compose.yml
```
version: '3'
services:
app:
image: myapp
ports:
- 5566:80
restart: always
environment:
- owner=LIAO
```
執行`docker-compose`
```
$ docker-compose -f docker-compose.yml up
Recreating root_app_1 ... done
Attaching to root_app_1
app_1 | * Serving Flask app "main" (lazy loading)
app_1 | * Environment: production
app_1 | WARNING: This is a development server. Do not use it in a production deployment.
app_1 | Use a production WSGI server instead.
app_1 | * Debug mode: on
app_1 | * Running on http://0.0.0.0:80/ (Press CTRL+C to quit)
app_1 | * Restarting with stat
app_1 | * Debugger is active!
app_1 | * Debugger PIN: 162-450-668
```
用`curl`看看
```
$ curl 192.168.0.8:5566
Hello World! (Python 2.7.16) LIAO
```
## 實作5 Docker Push到倉庫
Docker Push到公用倉庫Docker Hub
* Docker Login
```
$ docker login
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Username: cutejaneii
Password:
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store
Login Succeeded
```
* Docker Tag：在推送到自己的repository之前，要先tag
```
$ docker tag myapp cutejaneii/myapp
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
cutejaneii/myapp latest 7aba68965779 40 minutes ago 696MB
myapp latest 7aba68965779 40 minutes ago 696MB
```
* Docker Push
```
$ docker push cutejaneii/myapp
The push refers to repository [docker.io/cutejaneii/myapp]
4e5b25e56255: Pushed
27ca79121151: Pushed
e1a81b1589ce: Pushed
f8093b983c20: Pushed
ebac8a5e2f5b: Pushed
ebd94299f5d0: Pushed
ff1c70957ceb: Pushed
1bb42387f7cb: Pushed
94119923fb5e: Pushed
a11003618325: Pushed
668c51fd0cef: Pushed
latest: digest: sha256:cd0d1e36474560d95f081fb96efe9d3182802a196a89fd9b2f617b058515d807 size: 2635
```
成功後在Docker Hub上就可以看到這個映像檔
