REMOTE HOST IDENTIFICATION HAS CHANGED warning when you try to connect to a server with ssh

If you work in the AWS environment and  launch and terminate servers frequently the same IP is reused many times. When you try to connect to a new server with SSH and the IP address is already in the known_hosts file you will get the following error message. @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! […]

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July 22nd, 2016 by Laszlo Pinter

SSL certificate is missing after installing ChefDK

When you install a new version of ChefDK and try to run Test Kitchen converge you may get the following error message >>>>>> ——Exception——- >>>>>> Class: Kitchen::ActionFailed >>>>>> Message: Failed to complete #create action: [SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed To solve the problem add the following to the Windows […]

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July 20th, 2016 by Laszlo Pinter

Winrm is missing after installing ChefDK

When you install the new version of ChefDK you may get the following error message when you try to run Test Kitchen !!!!!! The `winrm` gem is missing and must be installed or cannot be properly activated. Run `gem install winrm –version ‘[“~> 1.6”]’` or add the following to your Gemfile if you are using […]

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July 20th, 2016 by Laszlo Pinter

Berkshelf is missing after installing ChefDK

When you install a new version of ChefDK and try to run Test Kitchen the following error message may appear !!!!!! The `berkshelf’ gem is missing and must be installed or cannot be properly activated. Run `gem install berkshelf` or add the following to your Gemfile if you are using Bundler: `gem ‘berkshelf’`. To reinstall […]

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July 20th, 2016 by Laszlo Pinter

EC2 driver is missing after installing ChefDK

After installing a new version of ChefDK you may get the following error message when you try to run Test Kitchen: Message: Could not load the ‘ec2’ driver from the load path. Please ensure that your driver is installed as a gem or included in your Gemfile if using Bundler. To install the EC2 driver […]

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July 20th, 2016 by Laszlo Pinter

Error in Test Kitchen after installing ChefDK

You may get the following error when you try to run Test Kitchen after installing the latest version of ChefDK: $ kitchen C:/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require’: cannot load such file — dl/import (LoadError) from C:/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require’ from C:/Ruby22/lib/ruby/gems/2.2.0/gems/net-ssh-2.9.2/lib/net/ssh/authentication/pageant.rb:1:in `<top (required)>’ from C:/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require’ from C:/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require’ from C:/Ruby22/lib/ruby/gems/2.2.0/gems/net-ssh-2.9.2/lib/net/ssh/authentication/agent/socket.rb:5:in `<top (required)>’ from C:/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require’ from C:/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require’ from […]

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July 20th, 2016 by Laszlo Pinter

DevOps interview questions

When you are interviewing candidates for a DevOps position this collection of resources can help to ask the right questions. Wide variety of questions on the broad spectrum of tasks needed for the DevOps work. https://github.com/spikenode/DevOps-Interview-Questions

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July 14th, 2016 by Laszlo Pinter

Extract data from JSON with Ruby

Chef uses Ruby as the scripting language. If you need to extract data out from a JSON string you can use the following script # Save the JSON values instance_data_drive_config = ‘{“size”:”500″,”type”:”io1″,”iops”:”15000″}’ # Parse the JSON to a hash data = JSON.parse(instance_data_drive_config) # Declare the variables size = ” type = ” iops = ” […]

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July 13th, 2016 by Laszlo Pinter

DJI Phantom 4 firmware update stops at 92%

When I update the DJI Phantom 4 firmware with DJI Assistant 2 most of the times the update stops at 92%. If I turn off the DJI Phantom 4 and turn it on again the rear lights blink fast yellow (or fast white), and the DJI Assistant 2 application cannot recognize the DJI Phantom 4 anymore […]

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June 19th, 2016 by Laszlo Pinter

Switching to 2 factor authentication in GitHub

When you switch to 2 factor authentication GitHub generates a 40 character Personal Access Token that you can use as a password to access Git repositories. Create a Personal Access Token to use it as password in the command line tools Log into GitHub and in the pull down at the upper right select Settings On […]

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June 17th, 2016 by Laszlo Pinter