Mounting a Docker volume while being under a Windows host, has been a huge pain for me, and I could not get it to work.
Currently I got the following simple Dockerfile:
FROM php:5-apache
RUN apt-get update
When I build an image from it, and start a container
docker build -t phisch:dev .
docker run phisch:dev
the container starts properly.
But when I am trying to mount a volume,
docker run -v /c/Users/phisch/dev/htdocs:/var/www phisch:dev
the following message will be displayed:
C:\Users\phisch\dev>docker run -v /c/Users/phisch/dev/htdocs:/var/www phisch:dev
no such file or directory
docker: Error response from daemon: Container command not found or does not exist..
The /var/www
directory definitely exists in the container, and trying other directories does not change the result. Prepending a trailing slash to the host-side directory does not help either. (//c/Users/phisch/dev/htdocs
)
How do I mount for example /var/www
to C:/Users/phisch/dev/htdocs
?
phisch@DESKTOP-UC1LB9J MINGW64 ~/dev (master)
$ docker inspect phisch:dev
[
{
"Id": "sha256:73c1533222a905a378f12505ccbd9e9b34cde5a4b34ed008c39e23d5d58a9c91",
"RepoTags": [
"dev_web:latest",
"phisch:dev",
"phisch:dev3"
],
"RepoDigests": [],
"Parent": "sha256:d2c4149d86c4dfceaff0e9c4eb5a5d42ca7815f81dd08baad4dc8bda6db2fb10",
"Comment": "",
"Created": "2016-02-10T12:16:37.667236134Z",
"Container": "dad811f51ef3b94d9845d13a0e43ad07ccd5684ea2747b3846accdc71abeb628",
"ContainerConfig": {
"Hostname": "e06f5a03fe1f",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"ExposedPorts": {
"80/tcp": {}
},
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"PHP_INI_DIR=/usr/local/etc/php",
"PHP_EXTRA_BUILD_DEPS=apache2-dev",
"PHP_EXTRA_CONFIGURE_ARGS=--with-apxs2",
"GPG_KEYS=0BD78B5F97500D450838F95DFE857D9A90D90EC1 6E4F6AB321FDC07F2C332E3AC2BF0BC433CFC8B3",
"PHP_VERSION=5.6.18",
"PHP_FILENAME=php-5.6.18.tar.xz",
"PHP_SHA256=54dd9106c3469bc7028644d72ac140af00655420bbaaf4a742a64e9ed02ec1b0"
],
"Cmd": [
"/bin/sh",
"-c",
"apt-get update"
],
"ArgsEscaped": true,
"Image": "sha256:d2c4149d86c4dfceaff0e9c4eb5a5d42ca7815f81dd08baad4dc8bda6db2fb10",
"Volumes": null,
"WorkingDir": "/var/www/html",
"Entrypoint": null,
"OnBuild": [],
"Labels": {}
},
"DockerVersion": "1.10.0",
"Author": "",
"Config": {
"Hostname": "e06f5a03fe1f",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"ExposedPorts": {
"80/tcp": {}
},
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"PHP_INI_DIR=/usr/local/etc/php",
"PHP_EXTRA_BUILD_DEPS=apache2-dev",
"PHP_EXTRA_CONFIGURE_ARGS=--with-apxs2",
"GPG_KEYS=0BD78B5F97500D450838F95DFE857D9A90D90EC1 6E4F6AB321FDC07F2C332E3AC2BF0BC433CFC8B3",
"PHP_VERSION=5.6.18",
"PHP_FILENAME=php-5.6.18.tar.xz",
"PHP_SHA256=54dd9106c3469bc7028644d72ac140af00655420bbaaf4a742a64e9ed02ec1b0"
],
"Cmd": [
"apache2-foreground"
],
"ArgsEscaped": true,
"Image": "sha256:d2c4149d86c4dfceaff0e9c4eb5a5d42ca7815f81dd08baad4dc8bda6db2fb10",
"Volumes": null,
"WorkingDir": "/var/www/html",
"Entrypoint": null,
"OnBuild": [],
"Labels": {}
},
"Architecture": "amd64",
"Os": "linux",
"Size": 491287784,
"VirtualSize": 491287784,
"GraphDriver": {
"Name": "aufs",
"Data": null
}
}
]
It turns out the container-side directory /var/www
needs to be empty, since it had a sub-directory www
. Docker was not able to use it as a mounting point.
It is possible the /
is interpreted as an option by the CMD Windows shell.
Try first a docker-machine ssh default, in order to open an ssh session in your VM. From there try the docker run again: docker run -v /c/Users/phisch/dev/htdocs:/var/www phisch:dev
As commented by thaJeztah in issue 18290:
You could consider using docker-compose; docker-compose allows you to define bind-mounted volumes relative to the location of the
docker-compose.yml
file.
Using adocker-compose
file allows you to specify all options needed to run your containers in a single file, which makes it ideal for sharing between team members (ie, just rundocker-compose up -d
will start all containers for the project with the right options).
This comment mentions a&dding a second /:
docker run -v //c/Users/phisch/dev/htdocs:`/var/www` phisch:dev
Even in the docker toolbox msys shell session, there are issues (like issue 282)
Pyetro notes in the comments:
In Windows, a double slash is needed at the beginning of the path to indicate the working directory.
Just to work with short path use like this:docker run -v //$(PWD)/folder:/folder ...
After lengthy discussion, the issue was that /var/www
had a folder in it.
Mounting /c/Users/phisch/dev/htdoc
onto an empty folder does work, but might not give the expected result, as the default CMD apache2-foreground
might still serve its content based on /var/www
(which would not have htdocs
content if that htdocs
is mounted onto another folder).
I use Docker for Windows with PowerShell and use $PWD
to refer to the current directory when mounting a volume, and it works well for me. A couple of examples:
docker run -p 2368:2368 -v $PWD/ghost:/var/lib/ghost -d ghost
docker run -p 2368:2368 -v $PWD/:/var/lib/ghost -d ghost
If we are talking about Docker on Windows then we have to take in account the fact that all containers are run on VirtualBox.
Before mounting volume to a container we have to be sure that particular folder is available for VirtualBox.
Firstly, to define the name of the current running Docker machine, run
$ docker-machine.exe active
default
Secondly, add shared folder to VirtualBox:
$ VBoxManage sharedfolder add default --name "some_project" --hostpath D:\Projects\some_project
Thirdly, create the folder
$ docker-machine.exe ssh default 'sudo mkdir --parents /d/projects/some_project'
Fourthly, mount it:
$ docker-machine.exe ssh default 'sudo mount -t vboxsf some_project /d/projects/some_project'
Finally, create a container:
$ docker run -v //d/projects/some_project://d/projects/some_project -d some-image_name
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