When a Scheduled task is created by another user (or SYSTEM) most of the time only that user can manually trigger the task execution. When you try to execute the scheduled task from the user interface you can get the error message: The user account does not have permission to run this task This error […]
Tag Archives: DevOps
Error loading table definition of a PostgreSQL table
When a PostgreSQL table name contains uppercase letters there is no known way to get the table definition SQL script. When we right-click a table name in SQLPro for Postgres the has an uppercase letter and select Script as, CREATE to, New query window we get the error message /* * Error loading table definition. * ERROR: […]
Use two GitHub accounts on the same computer
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 […]
Change the AWS account to launch instances with Chef Test Kitchen
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 security_group_ids. Make sure the management […]
Copy files between Linux machines
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 a remote server to your local workstation, execute rsync -avz -e “ssh -i SSH_KEY_NAME” […]
Using tmux terminal multiplexer
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 […]
Add SSH key access to a GitHub repository
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 […]
Creating CentOS server images with Packer
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 […]
Using Terraform
To generate graphs with Terraform Open a terminal window in the Terraform script directory Execute the command terraform graph | dot -Tsvg > graph.svg
SocketError: Error connecting to … Name or service not known
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 […]