In this article I will demonstrate how to create an Ubuntu 22 template in vCenter. Then use Terraform to create a vSphere VM based on this template. The VM template creation is done by manually stepping through the Ubuntu server ISO installation wizard, followed by a set of preparation steps. Then Terraform is used to … Terraform: creating an Ubuntu 22 template and then guest VM in vCenter
The kube-prometheus-stack bundles AlertManager for taking action on Prometheus alerts. And if you are customizing the Heml custom values file to configure email alerting, there are multiple options available. The simplest is to allow the system to fallback to using the default subject and html templates. But if you need to tailor the email content … Prometheus: external template for AlertManager html email with kube-prometheus-stack
With kustomize built into the kubectl CLI since version 1.14, there is little reason not to take advantage of this overlay system to deploy components to your Kubernetes cluster. Kustomize has the advantage that it is purpose built to understand and validate yaml and Kubernetes CRD, as opposed to bespoke templating solutions using sed/envsubst, Ansible, … Kubernetes: kustomize overlay to enrich a base resource
Although ‘kubectl annotate‘ will set an annotation on a object directly, it will not set the annotation on the more deeply nested pod template for a Deployment or Daemonset. If you want to quickly set the annotation on a pod template (.spec.template.metadata.annotations) without modifying the full manifest, you can use the ‘patch‘ command. As a … Kubernetes: adding and removing pod template annotations using kubectl
In this article I will demonstrate how to create an Ubuntu 20 Focal template in vCenter. Then use Terraform to create a vSphere VM based on this template. The VM template creation is done by manually stepping through an installation using the minimal Ubuntu server ISO followed by a set of preparation steps. Then Terraform … Terraform: creating an Ubuntu 20 Focal template and then guest VM in vCenter
If you can conform to a bit of naming convention, one way to easily render template files in Bash is to have the template and bash variables names match. Then you can either use sed or envsubst to do the substitution. For example, here are two variables being defined and then placeholders embedded into the … Bash: render template from matching bash variables
There are scenarios where instead of being explicit about each file name when generating templates from a role, you may want to take all the suffixed files in the ‘templates’ directory and dump their generated content into a destination directory. As a quick example, if you are in a role and want every script in … Ansible: generating content for all template files using with_fileglob
The mako template engine is a powerful module for Python used by many large sites including reddit.com. You simply push the variables you want into a context and then merge that with a text template. Additionally, mako allows you to take advantage of the full power of the Python language and libraries by allowing calls … Python: Calling python functions from mako templates
Many developers like to use Vagrant from HashiCorp to standardize the workflow of virtual machines: creation, running, destroying, taking snapshots, etc.. Usually Vagrant is used for Linux hosts, but it also works with Windows as long as you prepare the template properly. In a previous article I went over the detailed steps to create a template image for … Windows: Windows 2012 Sysprep for Vagrant readiness
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.
It is very common to have Logstash create time-based indexes in ElasticSearch that fit the format, <indexName>-YYYY.MM.DD. This means events submitted with @timestamp for that day all go to the same index. However, if you do not explicitly specify an index template that maps each field to a type, you can end up with unexpected query … ELK: Custom template mappings to force field types
ElasticSearch’s Metricbeat is a lightweight shipper of both system and application metrics that runs as an agent on a client host. That means that along with standard cpu/mem/disk/network metrics, you can also monitor Apache, Docker, Nginx, Redis, etc. as well as create your own collector in the Go language. In this article we will describe installing … ELK: Installing MetricBeat for collecting system and application metrics