kubernetes cluster metrics

• When you run a pod, some load is laid on the node that runs it.
• The pod consume some of the memory and cpu power of that node.
• We'll use a tool called metrics-server to inspect resources.
• For minikube, the resource-server is available as an addon.
  Here's how to install it (my profile is …

Motivation

• In many cases we want to keep configuration data about our applications.
• Examples:
  • lodations of servers/services (URLs, domain names, IP addresses)
  • directory/file locations on volumes..
  • credentials: user names, passwords, toekens etc.
• The idea is to decouple environment-specific configuration from your …

JSONPath is a query language for querying values in JSON strings.
It can help you navigate complex JSON values to retreive a specific value, or set of values.

JSON in kubernetes

• You can instruct kubernetes to modify the output to json:

 1$> kubectl get pods
 2NAME     READY   STATUS    RESTARTS   AGE
 3my-pod …

Motivation

-Service deployments and batch processing pipelines are often multi-dimensional entities.

• For example, you may have multiple micro-services per tier.

<img
  loading="lazy"
  decoding="async"
  alt="k8s …</picture></figure></p>

This guide installs kubectl on ubuntu.

Installing kubectl

• I base this guide on this page from the kubernetes documentation
• Selecting X86-64, I can now download the file (into a new temporary directory):

 1osboxes@osboxes:~$ 
 2osboxes@osboxes:~$ mkdir yuvinst
 3osboxes@osboxes:~$ cd yuvinst/
 4osboxes@osboxes:~/ …