HorizontalPodAutoscaler (HPA) allow you to dynamically scale the replica count of your Deployment based on criteria such as memory or CPU utilization, which make it great way to manage spikes in utilization while still keeping your cluster size and infrastructure costs managed effectively. In order for HPA to evaluate CPU and memory utilization and take … Kubernetes: implementing and testing a HorizontalPodAutoscaler
If you need to validate your AlertManager routing configuration by sending a test alert through AlertManager, you can port-forward the AlertManager pod and send it from curl on your development host. Real alerts typically have scrape delays and then durations that must be met, so this is a way of getting almost immediate feedback on … Prometheus: sending a test alert through AlertManager
Kubernetes has a rich way of expressing volumes/ volumeMounts for mounting files, emptyDir for ephemeral directories, and env/envFrom for adding environment variables to your container definition running on a Kubernetes cluster. However, if you are actively iterating on the development of an image, it may slow you down to require a deployment to a remote … Kubernetes: volumeMount, emptyDir, and env equivalents during local Docker development
A Bash script can often run into the situation where a utility in the pipeline creates a file, but because of an unexpected error, the size of the resulting file is zero bytes. And if that situation is not prepared for, the mere existence of the file might signal success to the following commands in … Bash: test both file existence and size to avoid signalling success
Ansible is an agentless configuration management tool that helps operations teams manage installation, patching, and command execution across a set of servers. In this article I’ll describe how to deploy the latest release of Ansible using pip on Ubuntu 16.04, and then perform a quick validation against a client.
Ansible is an agentless configuration management tool that helps operations teams manage installation, patching, and command execution across a set of servers. In this article I’ll describe how to deploy the latest release of Ansible using pip on Ubuntu 14.04, and then perform a quick validation against a client.
Syslog is a message logging standard has been around for decades, but has renewed popularity as a method of log capture with the advent of containerization and centralized logging solutions. Enabling an Ubutu 14.04 or 16.04 host to act as a syslog server only takes a few simple steps.
When tasked with deploying a web application and it is not responsive to your browser requests, sometimes you need to take a step back from the complexity of your full stack and run a quick sanity check. You can use netcat as a simple web server to prove to yourself that the network infrastructure is … Ubuntu: Simulating a Web Server using Netcat