[Docker Administration] [Part II] Dockerizing Application Flask
The next Step continuous from Docker Administration
Create Folder Project
mkdir -p Project/Flask
cd Project/Flask
Create requirements.txt file
echo -e "Flask\nRedis" > requirements.txt
Create app.py
vim app.py
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)
Create Dockerfile
vim Dockerfile
Fill with this Instruction:
FROM python:2.7-slim
RUN mkdir -p /app
WORKDIR /app
ADD . /app
RUN cd /app && pip install -r /app/requirements.txt
EXPOSE 80
ENV NAME World
CMD ["python", "app.py"]
Build Docker File Using Image friendlyhello
sudo docker build -t friendlyhello .
Show Images
sudo docker image ls
Running Image As Container
sudo docker run -d -p 4000:80 friendlyhello
Show Container UP
sudo docker container ls
Validation or test applicaiton
curl http://localhost:4000
Stop Container
sudo docker container stop [CONTAINER ID]
Show Container
sudo docker container ls -a