CODEWITHSUNDEEP
docker
Intrastellar Explorer
Intrastellar Explorer

Reputation: 2481

Copying file from host to Docker container's working directory

I am trying to copy files from a host that runs Debian/GNU Linux v9 to a docker container's working directory. The container is balenalib/beaglebone-black with some additions.

From this question, I understand the syntax to copy via docker cp. I have tried this: docker cp hostfile container_id:~/destinationfile. However, that obviously doesn't work because home directory may not be root directory.

How do I specify to copy the file into the docker container's working directory?

Upvotes: 2

Views: 2920

Answers (2)

β.εηοιτ.βε
β.εηοιτ.βε

Reputation: 39294

TL;DR;

docker cp hostFile containerId:$(docker inspect --format='{{.Config.WoringkDir}}' containerId)/hostFile

Here is what I found and how I found it:

As my comment stated it, I was pretty sure that docker inspect would have that kind of information.

From my experience, I know docker inspect gives out some JSON data and that there is a way to format that output.

So I launched a httpd container (because I know it has a working dir set), and just ran a unfiltered docker inspect on it.

  1. Getting the container in a detached state

    $ docker run -d httpd
Unable to find image 'httpd:latest' locally
latest: Pulling from library/httpd
f7e2b70d04ae: Pull complete
84006542c688: Pull complete
dae6fe3c5e81: Pull complete
33fc493aff90: Pull complete
9a4113020573: Pull complete
Digest: sha256:20ead958907f15b638177071afea60faa61d2b6747c216027b8679b5fa58794b
Status: Downloaded newer image for httpd:latest
5d85e4926b578e15abdb92650a56f6507d01f04a31de33f179583eccf0a3a6c3

  2. Finding its friendly name

    $ docker ps -a
CONTAINER ID        IMAGE               COMMAND              CREATED             STATUS              PORTS         NAMES
5d8e4926b57        httpd               "httpd-foreground"   12 seconds ago      Up 11 seconds       80/tcp         friendly_murdock

  3. A quick grep to insure what we are looking for is there*

    $ docker inspect friendly_murdock | grep Work
                "WorkDir": "/var/lib/docker/overlay2/c3b938dfd53dd42370953ac6bfc04bce444588ca449a43b922e0ba41b189102b/work"
            "WorkingDir": "/usr/local/apache2",

  4. Getting the full information to see where the info is in the JSON hierarchy; that points at the fact that WorkingDir is under Config (scroll around 3/4 of the JSON to discover it by yourself)*

    $ docker inspect friendly_murdock
[
   {
      "Id": "5d85e4926b578e15abdb92650a56f6507d01f04a31de33f179583eccf0a3a6c3",
      "Created": "2019-03-13T20:37:31.489661896Z",
      "Path": "httpd-foreground",
      "Args": [],
      "State": {
            "Status": "running",
            "Running": true,
            "Paused": false,
            "Restarting": false,
            "OOMKilled": false,
            "Dead": false,
            "Pid": 2051,
            "ExitCode": 0,
            "Error": "",
            "StartedAt": "2019-03-13T20:37:31.961474223Z",
            "FinishedAt": "0001-01-01T00:00:00Z"
      },
      "Image": "sha256:2d1e5208483c26822b518c4ffa34ce1cd960f3e90e9be6ffe4c52cc6f5d5492c",
      "ResolvConfPath": "/var/lib/docker/containers/5d85e4926b578e15abdb92650a56f6507d01f04a31de33f179583eccf0a3a6c3/resolv.conf",
      "HostnamePath": "/var/lib/docker/containers/5d85e4926b578e15abdb92650a56f6507d01f04a31de33f179583eccf0a3a6c3/hostname",
      "HostsPath": "/var/lib/docker/containers/5d85e4926b578e15abdb92650a56f6507d01f04a31de33f179583eccf0a3a6c3/hosts",
      "LogPath": "/var/lib/docker/containers/5d85e4926b578e15abdb92650a56f6507d01f04a31de33f179583eccf0a3a6c3/5d85e4926b578e15abdb92650a56f6507d01f04a31de33f179583eccf0a3a6c3-json.log",
      "Name": "/friendly_murdock",
      "RestartCount": 0,
      "Driver": "overlay2",
      "Platform": "linux",
      "MountLabel": "",
      "ProcessLabel": "",
      "AppArmorProfile": "docker-default",
      "ExecIDs": null,
      "HostConfig": {
            "Binds": null,
            "ContainerIDFile": "",
            "LogConfig": {
               "Type": "json-file",
               "Config": {}
            },
            "NetworkMode": "default",
            "PortBindings": {},
            "RestartPolicy": {
               "Name": "no",
               "MaximumRetryCount": 0
            },
            "AutoRemove": false,
            "VolumeDriver": "",
            "VolumesFrom": null,
            "CapAdd": null,
            "CapDrop": null,
            "Dns": [],
            "DnsOptions": [],
            "DnsSearch": [],
            "ExtraHosts": null,
            "GroupAdd": null,
            "IpcMode": "shareable",
            "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": [],
            "BlkioDeviceReadBps": null,
            "BlkioDeviceWriteBps": null,
            "BlkioDeviceReadIOps": null,
            "BlkioDeviceWriteIOps": null,
            "CpuPeriod": 0,
            "CpuQuota": 0,
            "CpuRealtimePeriod": 0,
            "CpuRealtimeRuntime": 0,
            "CpusetCpus": "",
            "CpusetMems": "",
            "Devices": [],
            "DeviceCgroupRules": null,
            "DiskQuota": 0,
            "KernelMemory": 0,
            "MemoryReservation": 0,
            "MemorySwap": 0,
            "MemorySwappiness": null,
            "OomKillDisable": false,
            "PidsLimit": 0,
            "Ulimits": null,
            "CpuCount": 0,
            "CpuPercent": 0,
            "IOMaximumIOps": 0,
            "IOMaximumBandwidth": 0,
            "MaskedPaths": [
               "/proc/asound",
               "/proc/acpi",
               "/proc/kcore",
               "/proc/keys",
               "/proc/latency_stats",
               "/proc/timer_list",
               "/proc/timer_stats",
               "/proc/sched_debug",
               "/proc/scsi",
               "/sys/firmware"
            ],
            "ReadonlyPaths": [
               "/proc/bus",
               "/proc/fs",
               "/proc/irq",
               "/proc/sys",
               "/proc/sysrq-trigger"
            ]
      },
      "GraphDriver": {
            "Data": {
               "LowerDir": "/var/lib/docker/overlay2/c3b938dfd53dd42370953ac6bfc04bce444588ca449a43b922e0ba41b189102b-init/diff:/var/lib/docker/overlay2/bffe6a5f69cd186be0fbe6ac4d1a18c9f33a59eb1d2dfc4704fc0b5d9202d565/diff:/var/lib/docker/overlay2/13828a5afe316d7a37ded8f3c42e05ceb715ac494773ebe285e0a458edc6f5eb/diff:/var/lib/docker/overlay2/9e4ef1c4b0bdb2bd958bceefe3ca911ec70613445dc58e600237110ecd938226/diff:/var/lib/docker/overlay2/31b84ae126e4483a5dea9476d076a6a3dd21833f4e27777512a5302157519a3c/diff:/var/lib/docker/overlay2/982c67754fe156ee05e0675889cd648f1c4f8c4a115cf0ab0c83bdb457228845/diff",
               "MergedDir": "/var/lib/docker/overlay2/c3b938dfd53dd42370953ac6bfc04bce444588ca449a43b922e0ba41b189102b/merged",
               "UpperDir": "/var/lib/docker/overlay2/c3b938dfd53dd42370953ac6bfc04bce444588ca449a43b922e0ba41b189102b/diff",
               "WorkDir": "/var/lib/docker/overlay2/c3b938dfd53dd42370953ac6bfc04bce444588ca449a43b922e0ba41b189102b/work"
            },
            "Name": "overlay2"
      },
      "Mounts": [],
      "Config": {
            "Hostname": "5d85e4926b57",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "ExposedPorts": {
               "80/tcp": {}
            },
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
               "PATH=/usr/local/apache2/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
               "HTTPD_PREFIX=/usr/local/apache2",
               "HTTPD_VERSION=2.4.38",
               "HTTPD_SHA256=7dc65857a994c98370dc4334b260101a7a04be60e6e74a5c57a6dee1bc8f394a",
               "HTTPD_PATCHES=",
               "APACHE_DIST_URLS=https://www.apache.org/dyn/closer.cgi?action=download&filename= \thttps://www-us.apache.org/dist/ \thttps://www.apache.org/dist/ \thttps://archive.apache.org/dist/"
            ],
            "Cmd": [
               "httpd-foreground"
            ],
            "ArgsEscaped": true,
            "Image": "httpd",
            "Volumes": null,
            "WorkingDir": "/usr/local/apache2",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": {}
      },
      "NetworkSettings": {
            "Bridge": "",
            "SandboxID": "971f52a7ce81d0c5ceb1e501101ea852d5a9898c57c5f6bbe4b96c9efcc016db",
            "HairpinMode": false,
            "LinkLocalIPv6Address": "",
            "LinkLocalIPv6PrefixLen": 0,
            "Ports": {
               "80/tcp": null
            },
            "SandboxKey": "/var/run/docker/netns/971f52a7ce81",
            "SecondaryIPAddresses": null,
            "SecondaryIPv6Addresses": null,
            "EndpointID": "07e63ff9d1c53ad639a9d2bc065cd901afb00024395d22527a2d0297a98691fb",
            "Gateway": "172.17.0.1",
            "GlobalIPv6Address": "",
            "GlobalIPv6PrefixLen": 0,
            "IPAddress": "172.17.0.2",
            "IPPrefixLen": 16,
            "IPv6Gateway": "",
            "MacAddress": "02:42:ac:11:00:02",
            "Networks": {
               "bridge": {
                  "IPAMConfig": null,
                  "Links": null,
                  "Aliases": null,
                  "NetworkID": "8c894781eecadaf63f14ad1da23c26abb42ef3316f7d6ebd1c89b3adac96d99c",
                  "EndpointID": "07e63ff9d1c53ad639a9d2bc065cd901afb00024395d22527a2d0297a98691fb",
                  "Gateway": "172.17.0.1",
                  "IPAddress": "172.17.0.2",
                  "IPPrefixLen": 16,
                  "IPv6Gateway": "",
                  "GlobalIPv6Address": "",
                  "GlobalIPv6PrefixLen": 0,
                  "MacAddress": "02:42:ac:11:00:02",
                  "DriverOpts": null
               }
            }
      }
   }
]

  5. Finding the right command with the help of the documentation examples

    $ docker inspect --format='{{.Config.WorkingDir}}' friendly_murdock
/usr/local/apache2

  6. Combine it whit what we know already*

    docker cp hostFile containerId:$(docker inspect --format='{{.Config.WoringkDir}}' containerId)/hostFile

Upvotes: 3

Diego Gallegos
Diego Gallegos

Reputation: 1752

You can use a volume to copy a file from host to container as follows:

docker run -it --volume $PWD/directory:/tmp/dir balenalib/beaglebone-black

Note that you cannot use relative paths to mount volumes on cli form. To do that use docker-compose instead:

version: "3"
services:
  beaglebone: 
    image: balenalib/beaglebone-black 
    volumes: "../dir:/tmp/dir"
...

Then run docker-compose: 

docker-compose up

Check the docs on volume types.

https://docs.docker.com/storage/volumes/

Upvotes: 1

Related Questions