[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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Petya attack is In Progress

Just received a security advisory from Trend Micro about a Ransomware attack in progress which is said to be a variant of Petya.


Guys, Please update all your devices as a first step!



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Reduce JPEG size up to 35% with Guetzli

Google has recently open sourced a JPEG encoder which reduces a uncompressed JPEG image up to 35% of its file size. Check it out on Github: https://github.com/google/guetzli/.

This means less bytes transmitted over the wire!!!



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Part of Books from My Collection


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Allo – new AI Assistant

There has been a steep increase in the research in recent days on AI and related technologies/techniques. Another spike of trends in adoption of Neural Networks, now Deep Neural Networks. The recent launch of Allo by Google seems to be an outcome of that.


Allo is a any other chat app like whatsapp but an addition of Google (AI) Assistant which answers your questions, sets reminders for you, searches for places around you based on where u r located and much more. For some questions though which it does not have answers gives the top best google search result. It also comes with another feature of predicting a response to a chat message. But i personally find it a nice handy app to set a quick reminder or lets say, tell it to give me weather forecast every morning at 10 and it does it as commanded. ALLO!

Further Reading:





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gRPC – Binary RPC Framework

Google had open sourced gRPC a Binary Remote Procedure Call Framework in 2015 and recently there was a 1.0 release of the new RPC framework which uses latest HTTP/2 and also uses Protocol Buffers v3.0 which is the latest release of Binary Serialization Protocol.

In the FAQs on grpc.io there is a mention that we still cant use it in browsers


But it is being currently used in mobile clients to communicate efficiently with servers/cloud servers.

Further Reading:



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I/O 16



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