(this post is part of the material I cover in my devops course) In Kubernetes, a HorizontalPodAutoscaler(or HPA) automatically updates a workload resource (such as a Deployment or StatefulSet), with more pods. Scaling basics Horizontal scaling means run more processing units, where Vertical scaling means making a …

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(this post is part of the material I cover in my devops course) When you specify a Pod, you can optionally specify how much of each resource a container needs. Requests and limits Generally, you have these tools to control the resources that a pod will use: Resource Requests Resource Limits (which we'll demonstrate in …

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(this post is part of the material I cover in my devops course) 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 …

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(this post is part of the material I cover in my devops course) 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 …

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(this post is part of the material I cover in my devops course) 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 …

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(this post is part of the material I cover in my devops course) Motivation -Service deployments and batch processing pipelines are often multi-dimensional entities. For example, you may have multiple micro-services per tier. Labels Labels are key/value pairs that are attached to objects, such as pods or deployments …

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(this post is part of the material I cover in my devops course) The main power of kubernetes is running things at scale. Deployments are meant to run multiple pods, on multiple nodes. About Deployments A kuberneteis deployment is a kubernetes object that is meant to define and run pods at scale. It contains another …

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(this post is part of the material I cover in my devops course) A pod is a group (sometimes of whales) of containers. Does it mean that kubernetes is asking us to put multiple containers in a pod? What Multiple Containers The k8s Pods guide tells us that: "A Pod models an application-specific "logical …

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(this post is part of the material I cover in my devops course) pods are the basic computing unit of kubernetes. Pods Facts A Pod (as in a pod of whales or pea pod) is a group of one or more containers Pod containers share storage and network resources ..so same IP address for all containers in the pod can share …

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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:~/yuvinst$ …

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