Docker bound mount - can not see changes on browser - docker

Question

I'm using docker-toolbox on windows home.
I was able to run a jekyll-serve web server image to see the default page on browser, but when I try to edit file on VS Code, I can not see the changes after refreshing the browser.
Any idea why I can not see the changes after refresh?
Step to reproduce:
First I've git cloned this repository into my c:/Users/shaharshokrani/udemy-docker-mastery/bind-mount-sample1 (I'm able to see the files with ls on 'cmder' console).
Then I was able to run this image with:
docker run -v //c/users/shaharshokrani/udemy-docker-mastery/bindmount-sample-1:/site bretfisher/jekyll new .
docker container run -p 80:4000 --name myjekyll -v //c/users/shaharshokrani/udemy-docker-mastery/bindmount-sample-1:/site bretfisher/jekyll-serve
And I'm able to see the default welcome page on http://192.168.99.100/.
I've tried to edit and save using VS Code this 2017-03-05-welcome-to-jekyll.markdown but I can not see the changes after refreshing the browser.
I also checked the VM for shared network - it shows c:/users/.
Even the Mounts on inspect looks good:
"Mounts": [
{
"Type": "bind",
"Source": "/c/users/shaharshokrani/udemy-docker-mastery/bindmount-sample-1",
"Destination": "/site",
"Mode": "",
"RW": true,
"Propagation": "rprivate"
}
],
And the image dockerfile's CMD has the --force_polling flag.
Both the images (bretfisher/jekyll-serve, bretfisher/jekyll) are latest.
The docker container logs -f myjekyll looks good:
Bundle complete! 4 Gemfile dependencies, 28 gems now installed.
Bundled gems are installed into `/usr/local/bundle`
Configuration file: /site/_config.yml
Source: /site
Destination: /site/_site
Incremental build: disabled. Enable with --incremental
Generating...
Jekyll Feed: Generating feed for posts
done in 1.031 seconds.
Auto-regeneration: enabled for '/site'
Server address: http://0.0.0.0:4000/
Server running... press ctrl-c to stop.
Docker version:
Client:
Version: 18.03.0-ce
API version: 1.37
Go version: go1.9.4
Git commit: 0520e24302
Built: Fri Mar 23 08:31:36 2018
OS/Arch: windows/amd64
Experimental: false
Orchestrator: swarm
Server: Docker Engine - Community
Engine:
Version: 19.03.3
API version: 1.40 (minimum version 1.12)
Go version: go1.12.10
Git commit: a872fc2f86
Built: Tue Oct 8 01:01:20 2019
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: v1.2.10
GitCommit: b34a5c8af56e510852c35414db4c1f4fa6172339
runc:
Version: 1.0.0-rc8+dev
GitCommit: 3e425f80a8c931f88e6d94a8c831b9d5aa481657
docker-init:
Version: 0.18.0
GitCommit: fec3683

Answer 1

Issue identified
Bind mounting actually does not work for docker toolbox:
file change events in mounted folders of host are not propagated to
container by Docker for Windows
Solution
This script is intended to be the answer to this issue: docker-windows-volume-watcher.
Side note
This is a common issue with data manipulated outside of your container.
For jekyll, in particular, even the solution described in the issue below does not work for windows-based systems.
https://github.com/jekyll/jekyll-watch/issues/17
In short you need to execute jekyll with the --force_polling flag (Does not work with Windows Hosts). You can find it in the jekyll docs here
https://jekyllrb.com/docs/configuration/options/
On Linux based systems it works out of the box since the image used in the question bretfisher/jekyll-serve already utilizes the --force_polling flag.
just ran
docker run --rm -it -e JEKYLL_NEW=true -p 8080:4000 -v (pwd):/site bretfisher/jekyll new .
to create a new jekyll site and
docker run --rm -it -e JEKYLL_NEW=true -p 8080:4000 -v (pwd):/site bretfisher/jekyll-serve
to run it mounted to a directory on my machine (linux) and was able to edit a file with changes propagating to jekyll.