Dockerfile文件製做本身的鏡像

1.建立空目錄

$ cd /home/xm6f/dev 
$ mkdir myapp
$ cd myapp/

 

2.vim Dockerfile，內容以下：

## 一個基礎的 python 運行環境
FROM python
## 設置工做目錄
WORKDIR /app
## 將當前系統文件夾內容複製到容器的 app 目錄
ADD . /app
## 安裝必要的依賴包
RUN pip install -r softwares.txt
## 開放端口，供容器外訪問

EXPOSE 80
EXPOSE 3088
EXPOSE 8080
EXPOSE 8066

## 定義環境變量
ENV NAME HELLO
## 運行命令
CMD ["python","app.py"]

 

3.安裝依賴
vim softwares.txt，內容以下：

Flask
Redis

 

4.vim app.py，內容以下：

from flask import Flask
from redis import Redis, RedisError
import os
import socket
# Connect to Redis
redis = Redis(host="redis", db=0, socket_connect_timeout=2, socket_timeout=2)
app = Flask(__name__)
@app.route("/")
def hello():
    try:
        visits = redis.incr("counter")
    except RedisError:
        visits = "<i>cannot connect to Redis, counter disabled</i>" 
    html = "<h3>Hello {name}!</h3>" \
           "<b>Hostname:</b> {hostname}<br/>" \
           "<b>Visits:</b> {visits}"
    return html.format(name=os.getenv("NAME", "world"), hostname=socket.gethostname(), visits=visits)
if __name__ == "__main__":
    app.run(host='0.0.0.0', port=80)

 

5.編譯

$ docker build -t myfirstapp .

 

6.查看新生成了一個image

$ docker images
REPOSITORY                   TAG                 IMAGE ID            CREATED             SIZE
myfirstapp                   latest              01ea1129a831        2 hours ago         699MB

 

7.啓動image

$ docker run -p 4000:80 myfirstapp 
也能夠放在後臺運行:
$ docker run -d -p 4000:80 myfirstapp

 

8.訪問服務

# curl http://localhost:4000
<h3>Hello world!</h3><b>Hostname:</b> a6655d0d7e74<br/><b>Visits:</b> <i>cannot connect to Redis, counter disabled</i>

或者瀏覽器訪問服務：http://192.168.1.160:4000

 

9.查看當前運行的鏡像

$ docker ps
CONTAINER ID MAGE          COMMAND            CREATED       STATUS       PORTS                  NAMES
2db45cab2bb4 myfirstapp    "python app.py"  2 minutes ago Up 2 minutes 0.0.0.0:4000->80/tcp   elastic_wilson

 

10.中止鏡像

$ docker stop 2db45cab2bb4