docker-compose volume not synced - docker

Question

PROBLEM
I use docker-compose for development with Python/Flask. I want my host codebase to sync with one inside docker container but not...
SITUATION
My working directory structure is below:
.
├── Dockerfile
├── docker-compose.yml
├── app.py
└── requirements.txt
I made bind mount from host's current directory to container's /app.
Dockerfile:
FROM python:3.7.3-alpine3.9
WORKDIR /app
COPY requirements.txt requirements.txt
RUN pip install --upgrade pip && \
pip install -r requirements.txt
COPY . .
CMD gunicorn -b 0.0.0.0:9000 -w 4 app:app
docker-compose.yml:
version: '3'
services:
web:
build: .
ports:
- "4649:9000"
volumes:
- .:/app
When I access http://localhost:4649 I can see correct response so Docker container is working well. However response don't update when I change app.py.
I inspected the container and the result is below
"Mounts": [
{
"Type": "bind",
"Source": "/Users/emp-mac-zakiooo/dev/jinja-pwa",
"Destination": "/app",
"Mode": "rw",
"RW": true,
"Propagation": "rprivate"
}
],
It looks very right so I have no idea about this problem 😇

Answer 1

OMG I found my files are correctly synced but gunicorn cached them so added --reload to CMD in Dockerfile, and finally it fixed.
Thank you for helping and soooo sorry for my foolishness...!

Answer 2

You could achieve that by doing the following:
volumes:
mount:
driver: local
driver_opts:
type: nfs
o: addr=host.docker.internal,rw,nolock,hard,nfsvers=3
device: ":${PWD}/path"
In your volume declaration within a service, you can do the following:
version: '3'
services:
web:
build: .
ports:
- "4649:9000"
volumes:
- mount:/app
Add the following to /etc/exports to enable docker access to your nfs volumes
<path to $WORKSPACE> 127.0.0.1 -alldirs -mapall=0:80 once it's there you need to run sudo nfsd restart to include your changes.
if ever docker-compose stops responding when using NFS, restarting docker usually fixes it
I hope that this helps!