Unable to see files inside a container - windows

Question

I'm unable to access content in a container created using docker-compose; it's been suggested to me that this could be because the content folder on the host is not being mounted correctly. (Note: I don't know how to validate this advice, so I must assume that it's correct.)
Here's my docker-compose.yml file:
version: "2.1"
services:
docs:
image: docs/docstage
ports:
- "4000:4000"
volumes:
- "./:/usr/src/app"
Here's the output of my docker-compose command:
D:\Dev\Git\docker.github.io>docker-compose up
Creating dockergithubio_docs_1 ...
Creating dockergithubio_docs_1 ... done
Attaching to dockergithubio_docs_1
docs_1 | Configuration file: none
docs_1 | Configuration file: none
docs_1 | Source: /usr/src/app
docs_1 | Destination: /_site
docs_1 | Incremental build: disabled. Enable with --incremental
docs_1 | Generating...
docs_1 | done in 0.017 seconds.
docs_1 | Auto-regeneration: enabled for '/usr/src/app'
docs_1 | Configuration file: none
docs_1 | Server address: http://0.0.0.0:4000/
docs_1 | Server running... press ctrl-c to stop.
docs_1 | [2017-07-17 20:58:02] ERROR `/favicon.ico' not found.
...and here's the result:
C:\Users\Admin>docker exec -it 863a59969066 bash
root#863a59969066:/usr/src/app# ls
root#863a59969066:/usr/src/app#
As we can see, there's no content in the container. Also, browsing to the URL reveals an empty directory:
Here's the result of docker container inspect:
C:\Users\Admin>docker inspect dockergithubio_docs_1
[
{
"Id": "863a59969066444d0b6e908a46d0f05b68605b7fe72bfd4b0ddf2036847b0779",
"Created": "2017-07-17T20:57:06.7250794Z",
"Path": "/bin/sh",
"Args": [
"-c",
"jekyll serve -d /_site --watch -H 0.0.0.0 -P 4000"
],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 3252,
"ExitCode": 0,
"Error": "",
"StartedAt": "2017-07-17T20:57:08.0003358Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Image": "sha256:9670258d73f081ef2c7dd476c56fc5945627ee68867e1296fbe19e612ddd29a4",
"ResolvConfPath": "/var/lib/docker/containers/863a59969066444d0b6e908a46d0f05b68605b7fe72bfd4b0ddf2036847b0779/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/863a59969066444d0b6e908a46d0f05b68605b7fe72bfd4b0ddf2036847b0779/hostname",
"HostsPath": "/var/lib/docker/containers/863a59969066444d0b6e908a46d0f05b68605b7fe72bfd4b0ddf2036847b0779/hosts",
"LogPath": "/var/lib/docker/containers/863a59969066444d0b6e908a46d0f05b68605b7fe72bfd4b0ddf2036847b0779/863a59969066444d0b6e908a46d0f05b68605b7fe72bfd4b0ddf2036847b0779-json.log",
"Name": "/dockergithubio_docs_1",
"RestartCount": 0,
"Driver": "overlay2",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": [
"/D/Dev/Git/docker.github.io:/usr/src/app:rw"
],
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "dockergithubio_default",
"PortBindings": {
"4000/tcp": [
{
"HostIp": "",
"HostPort": "4000"
}
]
},
"RestartPolicy": {
"Name": "",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": [],
"CapAdd": null,
"CapDrop": null,
"Dns": null,
"DnsOptions": null,
"DnsSearch": null,
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"ConsoleSize": [
0,
0
],
"Isolation": "",
"CpuShares": 0,
"Memory": 0,
"NanoCpus": 0,
"CgroupParent": "",
"BlkioWeight": 0,
"BlkioWeightDevice": null,
"BlkioDeviceReadBps": null,
"BlkioDeviceWriteBps": null,
"BlkioDeviceReadIOps": null,
"BlkioDeviceWriteIOps": null,
"CpuPeriod": 0,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": null,
"DeviceCgroupRules": null,
"DiskQuota": 0,
"KernelMemory": 0,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": -1,
"OomKillDisable": false,
"PidsLimit": 0,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0
},
"GraphDriver": {
"Data": {
"LowerDir": "/var/lib/docker/overlay2/8f7ba6861640a6fb639f64c475db0260cb4c9ded686711b05625ff37c19737fa-init/diff:/var/lib/docker/overlay2/0772e69f7faba8d149e7d9aed149d4607c905f1d01b28b97f5453772e5326904/diff:/var/lib/docker/overlay2/6d2a854de0c3c7af4e8e3b6ef831af1dde8c400f5aa8fd809d76a06f3ba5c705/diff:/var/lib/docker/overlay2/8a4466b60f60d0141625c1ad32233f3fee49821f534f8709685c2d6514b9d3f6/diff:/var/lib/docker/overlay2/6a4fe33cae424e9a671300332244aa19f5a314d90c945b399f35ea487e01d333/diff:/var/lib/docker/overlay2/de35de0b23cb93e811a7f2ec6b59e3e282faf770131179c60cad588c522551be/diff:/var/lib/docker/overlay2/e7f896a4b4d0da7ddbddd208a9130affea2358f4b1fd147f403b82fe7fe748aa/diff:/var/lib/docker/overlay2/b09694bfeb6b2e7d75de351286d95bf9af18181004f9d3c2d9bf73ea6538ba56/diff:/var/lib/docker/overlay2/4feb0e4dccefd6570fee715baf80ebe6ea77ab133cc3ac15fd850bb737f7e8b2/diff:/var/lib/docker/overlay2/1291c76b0bb03c133b70dad4dd08147f3c753b52f8ac3070d2e0f9bbdd99e874/diff:/var/lib/docker/overlay2/9166f2a32c7b3284fab5a95803ac66c83cba936161083f0405b630178f5dbeb2/diff:/var/lib/docker/overlay2/46499476944e8234be84f662104f3968f8717f3e36a67bb06d814f9c70998d9f/diff:/var/lib/docker/overlay2/fc1f9d566f52e9f994bd02dd73528fb3402a98a2618c5b3a9dbf10c8c5ae554c/diff",
"MergedDir": "/var/lib/docker/overlay2/8f7ba6861640a6fb639f64c475db0260cb4c9ded686711b05625ff37c19737fa/merged",
"UpperDir": "/var/lib/docker/overlay2/8f7ba6861640a6fb639f64c475db0260cb4c9ded686711b05625ff37c19737fa/diff",
"WorkDir": "/var/lib/docker/overlay2/8f7ba6861640a6fb639f64c475db0260cb4c9ded686711b05625ff37c19737fa/work"
},
"Name": "overlay2"
},
"Mounts": [
{
"Type": "bind",
"Source": "/D/Dev/Git/docker.github.io",
"Destination": "/usr/src/app",
"Mode": "rw",
"RW": true,
"Propagation": "rprivate"
}
],
"Config": {
"Hostname": "863a59969066",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"ExposedPorts": {
"4000/tcp": {}
},
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/bundle/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"RUBY_MAJOR=2.3",
"RUBY_VERSION=2.3.3",
"RUBY_DOWNLOAD_SHA256=241408c8c555b258846368830a06146e4849a1d58dcaf6b14a3b6a73058115b7",
"RUBYGEMS_VERSION=2.6.8",
"BUNDLER_VERSION=1.13.6",
"GEM_HOME=/usr/local/bundle",
"BUNDLE_PATH=/usr/local/bundle",
"BUNDLE_BIN=/usr/local/bundle/bin",
"BUNDLE_SILENCE_ROOT_WARNING=1",
"BUNDLE_APP_CONFIG=/usr/local/bundle",
"NPM_CONFIG_LOGLEVEL=info",
"NODE_MAJOR_VERSION=4",
"GITHUB_GEM_VERSION=112"
],
"Cmd": [
"/bin/sh",
"-c",
"jekyll serve -d /_site --watch -H 0.0.0.0 -P 4000"
],
"ArgsEscaped": true,
"Image": "docs/docstage",
"Volumes": {
"/usr/src/app": {}
},
"WorkingDir": "/usr/src/app",
"Entrypoint": null,
"OnBuild": null,
"Labels": {
"com.docker.compose.config-hash": "f86127819d2d94cf924f8d7ef0fe8579286043aebafc2940e6ca0b1d1b4828b7",
"com.docker.compose.container-number": "1",
"com.docker.compose.oneoff": "False",
"com.docker.compose.project": "dockergithubio",
"com.docker.compose.service": "docs",
"com.docker.compose.version": "1.14.0"
}
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "b6ad8a59f8f902f5a2fff0e4d6656bed6b3ecf1904424504886543614524f570",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {
"4000/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "4000"
}
]
},
"SandboxKey": "/var/run/docker/netns/b6ad8a59f8f9",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "",
"Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "",
"IPPrefixLen": 0,
"IPv6Gateway": "",
"MacAddress": "",
"Networks": {
"dockergithubio_default": {
"IPAMConfig": null,
"Links": null,
"Aliases": [
"docs",
"863a59969066"
],
"NetworkID": "8c5980632aa0810c818544573e76247a7b27f95e86d137e5f755cbff5b16b6aa",
"EndpointID": "ead13e880ebeede298f16c912d4eac0f5eb89ec5600da208202d54868273927d",
"Gateway": "172.18.0.1",
"IPAddress": "172.18.0.2",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:12:00:02",
"DriverOpts": null
}
}
}
}
]
At first glance this appears OK, but I must admit to a lack of knowledge on exactly interpreting the detail.
I've opened an issue here, but it seems I've exhausted all resources on that thread.
How can I determine whether there's a mount error occurring, and—if so—how can I fix it?

Answer 1

You need to configure docker to share your D drive into the embedded docker VM. Without that, the VM has nothing at this location and when mounting a volume in a container to a directory that doesn't exist (inside the docker VM, not on your windows machine), you get the resulting empty directory.
See the windows install steps for how to share this drive: