Now install the latest version of a docker-ce package. # dnf config-manager -add-repo=Īlso install containerd.io package which is available as a daemon that manages the complete container lifecycle of its host system, from image transfer and storage to container execution and supervision to low-level storage to network attachments and beyond. You will need to add the Docker repository first as it is no longer in the default package list using the following dnf config-manager command. # echo '1' > /proc/sys/net/bridge/bridge-nf-call-iptables # firewall-cmd -permanent -add-port=10255/tcp # firewall-cmd -permanent -add-port=10252/tcp # firewall-cmd -permanent -add-port=10251/tcp # firewall-cmd -permanent -add-port=10250/tcp

# firewall-cmd -permanent -add-port=6443/tcp Kubernetes PortsĬonfigure the firewall rules on the ports. Kubernetes makes use of various ports for communication and access and these ports need to be accessible to Kubernetes and not limited by the firewall. # sed -i -follow-symlinks 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux

To completely disable it, use the below command and reboot. Setting setenforce to 0 effectively sets SELinux to permissive, which effectively disables SELinux until the next reboot. Next, disable Selinux, as this is required to allow containers to access the host filesystem, which is needed by pod networks and other services. Next, ping your worker-node-1 and worker-node-2 to check if your updated host file is working correctly using the ping command. On your CentOS 8 Master-Node, set the system hostname and update DNS in your /etc/hosts file. Step 1: Prepare Hostname, Firewall, and SELinux The following institutions will be performed on CentOS 8 Master-Node.

As mentioned, we will be using Docker-CE. Our 3-node Kubernetes Cluster will look something like this: Kubernetes Cluster Diagram Installation of Kubernetes Cluster on Master-Nodeįor Kubernetes to work, you will need a containerization engine. Master Node – This machine generally acts as the control plane and runs the cluster database and the API server (which the kubectl CLI communicates with). At the end of this installation, our logical architecture will look something like this. Our installation is designed to have the Master-Node controlling the Worker Nodes.

Centos 8 install docker