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How to perform a backup of the etcd datastore To back up the cluster store, or etcd, we can create a snapshot file using the CLI tool etcdctl. This lab assumes a successful installation of the etcdctl tool and that prior knowledge of what etcd is and...
ReplicaSets are Kubernetes objects, like everything else in k8s. Their primary function is to ensure that a stable number of replica pods are always running the cluster in accordance with the spec in the YAML file. For this reason, they are instrumen...
Examining pods Using kubectl we can examine the pods running in the cluster. The simplest way is to run this command. # Simple command to examine the pods $ kubectl get po # To get information about the pods running in a specific namespace and showi...
To save time, and ensure the syntax and formatting are correct, a more efficient way to create a YAML file with the specs for a pod is to use kubectl and the --dry-run flag. $ kubectl run pod --image nginx --dry-run=client -o yaml > nginx-pod.yaml T...
This is the second part of my Kubernetes installation series using kubeadm. In Part 1, I covered the environment preparation, including hardware requirements and network configuration, as well as required Linux kernel modules. In this Part 2, I'll co...
There are multiple tools to install Kubernetes. A community supported tool is kubeadm and this lab uses it to install and build a Kubernetes cluster. Connecting to future control plane and worker nodes I'm using AWS to launch two instances that will ...
Linux Containers, or LXC, is an interface for Linux kernel vritualisation. You can create Linux containers that enable persistence, and system-level functionality. When comparing LXC to Docker, they both serve different use cases. Docker is more suit...
What are cgroups? They're a Linux kernel feature that allows the allocation, limiting and prioritisation of system resources across processes. They are a foundation for container technologies like Docker and Kubernetes. The first thing is to install ...
Pre-requisites Have a Google Cloud (GCP) account Some knowledge of SSH and how it works Step 1: Create SSH keys We will connect to a GCP virtual server using SSH to ensure secure communication between our local environment and the remote virtual ...