Beginner’s Guide to DevOps Engineering part 1.
DevOps engineering (Release engineering) is a relatively new profession. There is a very high demand for experienced DevOps engineers, because more and more large corporations want to migrate their data centers into the Cloud. In this series I will…
Enable file sharing on Windows servers in Amazon Web Services (AWS)
When you create an EC2 instance in Amazon Web Services (AWS) the security group (firewall) blocks all ports that are not explicitly opened. To make file sharing possible on Windows servers, open the following ports in the security group of the server:…
Chef script stops when it calls a custom resource
When you execute a Chef recipe that calls a custom resource and the execution stops without any output from the custom resource, make sure the custom resource does not reference a misspelled property with the #{PROPERTY_NAME} syntax.
How to copy files to the clipboard
When you work in the graphical user interface (GUI) of your operating system, and want to copy the contents of a file to the clipboard, you can use the following commands: On OS X run: cat FILE_NAME | pbcopy On Linux run: cat FILE_NAME | xclip On Windows…
How can I tell if a Chef cookbook is frozen
If a Chef cookbook is “frozen”, the cookbook is protected against accidental overwrite. When someone tries to overwrite it the “Version ... of cookbook COOKBOOK_NAME is frozen. Use --force to override" message appears. To check if a…
Upgrade Chef Client on Windows
If you have already installed Chef Client on a Windows box and want to upgrade to the latest version Open a Command Prompt and run as Administrator, Execute the following command, choco upgrade chef-client After the upgrade close the Command Prompt and…
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…
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:…
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"]'`…
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…