We are configuring Docker CE as Kubernetes CRI (Container Runtime Interface). You can either setup a Private DNS Server or use Local DNS Resolver for this purpose. Make sure the hostnames are resolvable on all nodes. * We must have at least 2 cores on each node to install Kubernetes. We have two CentOS 7 virtual machines with following specifications.

Adding a node to Kubernetes Cluster on CentOS 7.

Configuring Kubelet Service on Master Node.

Therefore, if you are interested to read more about Kubernetes you should read Kubernetes in Action by Manning Publications. This article is about the installation and configuration of Kubernetes on CentOS 7 and it doesn’t addresses the technical details about Kubernetes architecture and components.

Now, in this article, we are installing a two node Kubernetes / K8s cluster with Docker CE on CentOS 7. In our previous article, we have configured a Docker Swarm Cluster on CentOS 7 for container orchestration. Kubernetes supports different CRIs including Docker, containerd and cri-o.

Kubernetes requires a container runtime interface (CRI) for orchestration. Kubernetes is initially developed by Google, but now maintained by Cloud Native Computing Foundation. Kubernetes or k8s is an open-source container orchestration system for automated application deployment, management and scaling across clusters of hosts.

Docker installation on centos 7