How to create your own image using Dockerfile

1. Create an empty directory

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

2.vim Dockerfile, the content is as follows:

## A basic python runtime environment FROM python
## Set the working directory WORKDIR /app
## Copy the current system folder contents to the container's app directory ADD ./app
## Install necessary dependency packages RUN pip install -r softwares.txt
## Open port for access outside the container EXPOSE 80
EXPOSE 3088
EXPOSE 8080
EXPOSE 8066
## Define environment variable ENV NAME HELLO
## Run command CMD ["python","app.py"]

3. Install dependencies

vim softwares.txt, the content is as follows:

Flask
Redis

4.vim app.py, the content is 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 that a new image has been generated

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

7. Start the image

$ docker run -p 4000:80 myfirstapp

It can also be run in the background:

$ docker run -d -p 4000:80 myfirstapp

8. Access to the 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 use a browser to access the service: http://192.168.1.160:4000

9. 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

$ docker stop 2db45cab2bb4

The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM.

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