scp: Host does not exist: "C"

[robvelor]

Hi guys, I'm facing an issue running the scp command on docker machine for windows.

Machine version (Windows 7):

$ docker-machine version
docker-machine.exe version 0.6.0, build e27fb87

Command:

$ docker-machine scp ~/myfile.txt local-swarm-node-1:~/
Error loading host: Error loading host: Host does not exist: "C"

My guess is machine thinks the path /c/ is a machine instead of a path on the host machine. Is this supported on windows?

Are only relative paths supported on windows?

[fsoppelsa]

Probably a colon : present in Windows expanded paths like C:\Documents\myfile.txt disturbs the scp clients, that expect a colon : is used to separate host from path.

[nathanleclaire]

Yes, for scp you are forced into Unix-style filepaths for the time being. Try using the Toolbox quickstart (or MYSYS_NO_PATHCONV=1 in Git for Windows) and using the Unix notation:

$ docker-machine scp /c/users/rob/myfile.txt local-swarm-node-1:/home/docker

[machzqcq]

Tried in git-bash and docker quickstart terminal - same error though

pradeep@seleniumframework ~
$ export MYSYS_NO_PATHCONV=1

pradeep@seleniumframework ~
$ docker-machine scp /c/Users/pradeep/.docker/machine/machines/default/ca.pem default:/home/docker/.docker/
Error loading host: Error loading host: Host does not exist: "C"

[nathanleclaire]

It looks a lot like it's still attempt path translation. Make sure you're using Git for Windows as it's only a specific version that supports MSYS_NO_PATHCONV.

[robvelor]

@nathanleclaire I was using another terminal when I reported this, let me test with the quickstart one and see.

[robvelor]

Nope same error with the quickstart terminal and Unix notation.

$ docker-machine scp /c/Users/rvelasquez/myfile.txt local-swarm-node-1:~/
Error loading host: Error loading host: Host does not exist: "C"

[revelashaun]

I just tried this and it worked... localhost:/c/some-path

[fsoppelsa]

Need to specify in docs? @nathanleclaire

[efrecon]

I just bumped into the same problem, and indeed the solution is to:

1. Make sure you specify localhost: at the beginning (there is some specific code in the go implementation around localhost:)
2. Use "mounted" path, according to cygwin or whichever shell you are using on your windows machine.

This makes it hard to script docker-machine from the outside. I've just put in a fix for machinery around this. What I do is to call mount (which exists in most NIX-like environments on Windows) to list out where c: (or whichever the windows drive letter was) is mounted onto the shell file system. I then cache this for the life-time of the program. It works, but it's kind of clumsy.

Maybe should this (or similar) be done in docker-machine instead. Note that the scp.go implementation workaround using localhost: will have to be modded as it does a split on :, which obviously isn't doing a proper job when the file path contains a : itself. What do you think @nathanleclaire ?

[Mhussein27]

Dears ,please let me know what to do!! I am not able to copy from my local windows8 machine to the remote ubuntu machine I am using GITbash..The below is sample from my Gitbash output

Maha.Sallam@Maha MINGW64 ~/.ssh $ MYSYS_NO_PATHCONV=1

Maha.Sallam@Maha MINGW64 ~/.ssh $ docker-machine scp -r /C/Users/Maha.Sallam/.ssh default:~/.ssh Error loading host: Error loading host: Host does not exist: "C"

Maha.Sallam@Maha MINGW64 ~/.ssh $ docker-machine scp -r ~/.ssh default:~/.ssh Error loading host: Error loading host: Host does not exist: "C"

Maha.Sallam@Maha MINGW64 ~/.ssh $ docker-machine scp -r localhost:/C/Users/Maha.Sallam/.ssh default:~/.ssh id_rsa 100% 1675 428.6KB/s 00:00 id_rsa.pub 100% 398 128.1KB/s 00:00

[Mhussein27]

@nathanleclaire please advise ..

[efrecon]

I don't understand, @Mhussein27 the last line in your output examples seems to have performed well?

[mprasil]

We couldn't get it working even with localhost: prepended, but there's a quick workaround with cat if you want to transfer just one file:

docker-machine ssh machine_name "cat > /destination/file" < /c/source/path/file

[SvenDowideit]

and to add another weird version of the problem to the stack:

$ docker-machine -D scp gitlab:~/test .
Docker Machine Version:  0.13.0, build 9ba6da9
Found binary path at C:\Program Files\Docker\Docker\Resources\bin\docker-machine.exe
Launching plugin server for driver openstack
Plugin server listening at address 127.0.0.1:64527
() Calling .GetVersion
Using API Version  1
() Calling .SetConfigRaw
() Calling .GetMachineName
(sima-gitlab) Calling .GetSSHPort
(sima-gitlab) Calling .GetSSHKeyPath
(sima-gitlab) Calling .GetSSHKeyPath
(sima-gitlab) Calling .GetSSHKeyPath
(sima-gitlab) Calling .GetSSHHostname
(sima-gitlab) Calling .GetSSHUsername
{C:\Program Files\Git\usr\bin\scp.exe [C:\Program Files\Git\usr\bin\scp.exe -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o LogLevel=quiet -3 -o IdentitiesOnly=yes -o Port=22 -o IdentityFile="C:\\Users\\dow184\\.docker\\machine\\machines\\gitlab\\id_rsa" debian@43.240.97.7:~/test .] []  <nil> <nil> <nil> [] <nil> <nil> <nil> <nil> <nil> false [] [] [] [] <nil> <nil>}
usage: scp [-346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]
           [-l limit] [-o ssh_option] [-P port] [-S program]
           [[user@]host1:]file1 ... [[user@]host2:]file2
exit status 1

dow184@TOWER-SL MINGW64 ~/src/deployment (master)
$ uname -a
MINGW64_NT-10.0 TOWER-SL 2.9.0(0.318/5/3) 2018-01-12 23:37 x86_64 Msys

dow184@TOWER-SL MINGW64 ~/src/deployment (master)
$ scp  -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o LogLevel=quiet -3 -o IdentitiesOnly=yes -o Port=22 -o IdentityFile="C:\\Users\\dow184\\.docker\\machine\\machines\\gitlab\\id_rsa" debian@43.240.97.7:~/test .
test            

[unipark00]

I faced same problem. (windows10 home, docker toolbox) I tried to test scp command, but it failed.

$ docker version
Client:
 Version:       18.02.0-ce
 API version:   1.35 (downgraded from 1.36)
 Go version:    go1.9.4
 Git commit:    fc4de447b5
 Built: Mon Feb 12 19:03:38 2018
 OS/Arch:       windows/amd64
 Experimental:  false
 Orchestrator:  swarm

Server:
 Engine:
  Version:      17.12.1-ce
  API version:  1.35 (minimum version 1.12)
  Go version:   go1.9.4
  Git commit:   7390fc6
  Built:        Tue Feb 27 22:20:43 2018
  OS/Arch:      linux/amd64
  Experimental: false

$ pwd
/c/Users/Jungho/dockerws

$ ls -al
total 30
drwxr-xr-x 1 Jungho 197121    0 3월  12 21:46 ./
drwxr-xr-x 1 Jungho 197121    0 3월  12 21:42 ../
-rw-r--r-- 1 Jungho 197121  390 3월  12 21:17 docker.cow
-rw-r--r-- 1 Jungho 197121  511 3월  12 21:34 Dockerfile
-rw-r--r-- 1 Jungho 197121  569 3월  12 22:00 nginx.conf
-rw-r--r-- 1 Jungho 197121 2723 3월  12 21:46 nginx.conf.invalid

$ docker-machine scp /c/Users/Jungho/dockerws/nginx.conf default:/home/docker
Error loading host: Error loading host: Docker machine "C" does not exist. Use "docker-machine ls" to list machines. Use "docker-machine create" to add a new one.

How should I get solved??

[toby-howell]

@SvenDowideit Your log shows that Machine is passing C:\Program Files\Git\usr\bin\scp.exe as the first argument to scp. I see the same, and confirmed it with Process Monitor:

$ docker-machine --version
docker-machine.exe version 0.14.0, build 89b8332

This happens with and without localhost:.

[jgilfoil]

Same problem. Windows 10 using docker quick start terminal

Jason@Forge MINGW64 /d/Minikube/code
$ docker-machine --version
docker-machine.exe version 0.14.0, build 89b8332

$ docker-machine scp docker-media:/home/docker/plexserver.log localhost:/d/Minikube/.
cp: cannot stat 'Files\Git\usr\bin\scp.exe': No such file or directory
ssh: Could not resolve hostname c: Name or service not known
cp: cannot stat 'Files\Git\usr\bin\scp.exe': No such file or directory
cp: cannot stat '-o': No such file or directory
cp: cannot stat 'StrictHostKeyChecking=no': No such file or directory
cp: cannot stat '-o': No such file or directory
cp: cannot stat 'UserKnownHostsFile=/dev/null': No such file or directory
cp: cannot stat '-o': No such file or directory
cp: cannot stat 'LogLevel=quiet': No such file or directory
cp: cannot stat '-3': No such file or directory
cp: cannot stat '-o': No such file or directory
cp: cannot stat 'IdentitiesOnly=yes': No such file or directory
cp: cannot stat '-o': No such file or directory
cp: cannot stat 'Port=63735': No such file or directory
cp: cannot stat '-o': No such file or directory
ssh: Could not resolve hostname identityfile=d: Name or service not known
ssh: connect to host 127.0.0.1 port 22: Connection refused
exit status 1

[CollinChaffin]

Over a year later this is still broken today.

[efrecon]

Well, as nobody seems to be putting some effort into docker-machine, this is not likely to be fixed any time soon.

[bakoontz]

Still broken as of version 0.16.1, build cce350d7.

However, a kludge of a workaround:

dm -D scp app.jar docker@default:/home/docker/app.jar
...
{C:\cygwin64\bin\scp.exe [C:\cygwin64\bin\scp.exe -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o LogLevel=quiet -3 -o IdentitiesOnly=yes -o Port=55718 -o IdentityFile="C:\\Users\\.docker\\machine\\machines\\default\\id_rsa" app.jar docker@127.0.0.1:/home/docker/app.jar] []  <nil> <nil> <nil> [] <nil> <nil> <nil> <nil> <nil> false [] [] [] [] <nil> <nil>}
ssh: Could not resolve hostname c: Name or service not known
...

Copy the command inside of the square brackets, then paste it to your command-line and run. This works in cygwin's terminal window (if you replace all that silly backslash stuff in the scp.exe command with simply scp). I can't vouch for other terminals/setups.

There is obviously quite a bit of confusion as to how to make this work properly. Since I don't know Go, I don't have much to contribute other than this interim solution.

[arikw]

As a workaround, you can run a scp command and provide the Docker machine's ip and private key, like so:

MYSYS_NO_PATHCONV=1 scp -i $MACHINE_STORAGE_PATH/machines/$DOCKER_MACHINE_NAME/id_rsa \
root@$(docker-machine ip $DOCKER_MACHINE_NAME):/tmp/my-backup.zip \
/S/data/backup/backup_$(date +%Y%m%d_%H%M%S).zip

Works using git bash's scp command.

[FrankFang]

If you want to cope files from container to local (in Windows), you can

1. share /d with vm
2. docker-machine ssh; then copy files to /d/xxx
3. exit; then you can see files in Windows /d/xxx