docker Dockerfile file to make its own image

Create an empty directory

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

2.vim Dockerfile, which reads as follows:

## 1 A basic  python  Runtime environment 
FROM python
##  Set up working directory 
WORKDIR /app
##  Copies the contents of the current system folder to the container  app  directory 
ADD . /app
##  Install the necessary dependency packages 
RUN pip install -r softwares.txt
##  Open ports for outside container access 


EXPOSE 80
EXPOSE 3088
EXPOSE 8080
EXPOSE 8066
##  Define environment variables 
ENV NAME HELLO
##  Run the command 
CMD ["python","app.py"]

3. Installation dependencies

vim softwares.txt, which reads as follows:

Flask
Redis

4.vim app.py, which reads as follows:

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. Compile

$ docker build -t myfirstapp .

6. Check to see if the new student is an image

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

7. Start image

$ docker run -p 4000:80 myfirstapp 

It can also be run in the background:

$ docker run -d -p 4000:80 myfirstapp

8. Access services

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

Or the browser to access services: http: / / 192.168.1.160:4000

View the currently running image

$ 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. Stop mirroring

## 1 A basic  python  Runtime environment 
FROM python
##  Set up working directory 
WORKDIR /app
##  Copies the contents of the current system folder to the container  app  directory 
ADD . /app
##  Install the necessary dependency packages 
RUN pip install -r softwares.txt
##  Open ports for outside container access 


EXPOSE 80
EXPOSE 3088
EXPOSE 8080
EXPOSE 8066
##  Define environment variables 
ENV NAME HELLO
##  Run the command 
CMD ["python","app.py"]

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