[Docker for Windows] Certificate Error Solution

Problem Definition: After installing “Docker for Windows” on Windows 10 Professional box, when you type any docker command or lets say for eg. docker ps, you get following error:

could not read CA certificate "C:\\Users\\UserName\\.docker\\machine\\machines\\default\\ca.pem": open C:\\Users\\UserName\\.docker\machine\machines\default\ca.pem: The system cannot find the path specified.

And in the log.txt located in “C:\Users\UserName\AppData\Local\Docker\log.txt” you get a warning like following:

[11:14:53.591][DockerClientEnvironmentChecker][Warning] DOCKER_HOST environment variable detected, docker may not work properly

[11:14:53.591][DockerClientEnvironmentChecker][Warning] DOCKER_TLS_VERIFY environment variable detected, docker may not work properly

 

Solution: you need to delete all DOCKER_* environment variables from your machine. Which needs to be done in 2 steps:

Step 1> Go to Control Panel\All Control Panel Items\System Then click Advanced system settings, In System Propteries, Go to Advanced Tab and Click Environment Variables. Delete all DOCKER_* from System/User variables.

Step 2> Remove DOCKER_* from command prompt or PowerShell, i used PowerShell. using following steps

[Environment]::SetEnvironmentVariable("DOCKER_CERT_PATH", $null, "User")

[Environment]::SetEnvironmentVariable("DOCKER_HOST", $null, "User")

[Environment]::SetEnvironmentVariable("DOCKER_MACHINE_NAME", $null, "User")

[Environment]::SetEnvironmentVariable("DOCKER_TLS_VERIFY", $null, "User")

[Environment]::SetEnvironmentVariable("DOCKER_TOOLBOX_INSTALL_PATH", $null, "User")

Now Close and Open Powershell again and now run docker ps it will work fine without any Certificate Error.

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