Docker: An error occurred trying to connect

Question

Installed Docker on Windows with 2 additional installs, Oracle VM VirualBox and Kitematic. I've disabled Hyper-V in my Windows 10 PC. Now the problem is I can't download any Docker images from DockerHub, not even I can run the command as

Docker info

At both ends it shows the following error.

An error occurred trying to connect: Get http://localhost:2375/v1.21/info: dial tcp 127.0.0.1:2375: ConnectEx tcp: No connection could be made because the target machine actively refused it.

If I run it in Docker QuickStart Terminal it works, but not working in PowerShell or in MSBuild.

Answer 1

If you want to use PowerShell (in Windows 7) instead of Docker Quickstart Terminal then enter following commands step by step in your powershell terminal:

NOTE: You must have to start Docker Quickstart Terminal first before performing below operations

docker-machine.exe env --shell powershell it will display below commands on terminal:

$Env:DOCKER_TLS_VERIFY = "1"
$Env:DOCKER_HOST = "tcp://192.168.99.100:2376"
$Env:DOCKER_CERT_PATH = "C:\Users\pratikpat\.docker\machine\machines\default"
$Env:DOCKER_MACHINE_NAME = "default"
# Run this command to configure your shell:
# & "C:\Program Files\Docker Toolbox\docker-machine.exe" env --shell powershell | Invoke-Expression

Execute last displayed command to configure your shell:

& "C:\Program Files\Docker Toolbox\docker-machine.exe" env --shell powershell | Invoke-Expression

Answer 2

If you are using windows command prompt instead of Docker QuickStart Terminal see official docs you should make following steps (assuming your docker machine has the name default):

1. docker-machine start default or create new one
2. docker-machine lswill show you your machine running

3. docker-machine env --shell cmd default and you'll see something like

   SET DOCKER_TLS_VERIFY=1
   SET DOCKER_HOST=tcp://192.168.99.100:2376
   SET DOCKER_CERT_PATH=C:\Users\Arseny\.docker\machine\machines\default
   SET DOCKER_MACHINE_NAME=default
   REM Run this command to configure your shell:
   REM     FOR /f "tokens=*" %i IN ('docker-machine env --shell cmd default') DO %i
   

4. Run FOR /f "tokens=*" %i IN ('docker-machine env --shell cmd default') DO %i
5. Enjoy