Knowledge Base for IT Professionals, Teachers and Astronauts
Many developers have multiple GitHub accounts. One for personal projects, and another one for their work or business. There is a way to access multiple accounts simultaneously from the same computer. Only one account at a time can be configured using the HTTP connection, but we can configure the rest of the accounts using SSH. There are …
Continue reading “Use two GitHub accounts on the same computer”
The Chef SDK contains Test Kitchen, that can launch server instances to test your Chef cookbooks. Test Kitchen uses the “chef_zero” provisioner to use your workstation as the virtual Chef server. To switch Test Kitchen to launch instances in another AWS account In the .kitchen.yml file update the availability_zone subnet_id aws_ssh_key_id (if different in each account) …
Continue reading “Change the AWS account to launch instances with Chef Test Kitchen”
The rsync command allows you to copy files using SSH connection, between your workstation and another Linux machine. You have to be logged into one of the machines, this command cannot copy files between two remote machines. To copy a file from your local machine to a remote server rsync -avz -e “ssh -i SSH_KEY_FILE -o …
The tmux terminal multiplexer allows us to open multiple terminal windows in the same SSH session and continue the command execution even when we log out of the SSH session. This way we can execute long-running copy commands overnight without keeping the SSH session open. Install tmux On CentOS family Linux yum install tmux To start tmux …
Generate an SSH key pair In a terminal execute ssh-keygen Generating public/private rsa key pair. Enter file in which to save the key : /Users/MY_USERNAME/Git/_Keys/MY_PROJECT/MY_PROJECT_rsa_ci Enter passphrase (empty for no passphrase): Enter same passphrase again: Leave the passphrase empty, many systems cannot work with password protected key pairs. This process will save the key-pair in …
Continue reading “Add SSH key access to a GitHub repository”
The CentOS images are not available on the AWS Quick Start tab. CentOS publishes official images on the AWS Marketplace, but you need to subscribe to the image to be able to launch it with an automation software, like Terraform. Find the latest available CentOS image in the AWS Marketplace Execute this command to display the …
Continue reading “Creating CentOS server images with Packer”
To generate graphs with Terraform Open a terminal window in the Terraform script directory Execute the command terraform graph | dot -Tsvg > graph.svg
In an enterprise environment, the company usually operates its own DNS servers. When a Linux instance launches in AWS, the DNS settings only contain the AWS DNS server. If the company DNS server settings are applied with Chef, during the first Chef Client run those settings do not take effect. When we reference an internal DNS …
Continue reading “SocketError: Error connecting to … Name or service not known”
The “chocolatey_package” Chef resource can install NuGet packages from Artifactory. Artifactory is inconsistent in case sensitivity when an application is searching for a NuGet package. When we specify the package ID only, the search is not case sensitive. If the package is called “GoogleChrome” and we search for “googlechrome” the NuGet package is found in Artifactory. chocolatey_package ‘googlechrome’ do source ‘devops-chocolatey’ options “–allow-empty-checksums –ignore-package-exit-codes” end When we specify the version of the package, …
Continue reading “The specified version of the NuGet package is not found in Artifactory”
When we insert a video clip into our timeline that has the same height, but different width than our project, Adobe Premiere CC distorts the inserted clip. My project is 1920 x 1080, the inserted clip is 1440 x 1080. When I insert the narrower clip into my timeline, Adobe Premiere stretches the inserted clip horizontally. …
Continue reading “Scale inserted videos with the correct aspect ratio in Adobe Premiere CC”