~]# systemctl restart kubelet & systemctl enable kubelet Step 4: Initialize Kubernetes Master with ‘kubeadm init’ Start and enable kubectl and docker service ~]# systemctl restart docker & systemctl enable docker
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Once the package repositories are configured, run the beneath command to install kubeadm and docker packages. > EOF ~]# Step 3: Install Kubeadm and Docker Kubernetes packages are not available in the default CentOS 7 & RHEL 7 repositories, Use below command to configure its package repositories.
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Note: In case you don’t have your own dns server then update /etc/hosts file on master and worker nodes 192.168.1.30 k8s-masterĭisable Swap in all nodes using “ swapoff -a” command and remove or comment out swap partitions or swap file from fstab file Step 2: Configure Kubernetes Repository
~]# 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 ~]# sed -i -follow-symlinks 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux Login to your kubernetes master node and set the hostname and disable selinux using following commands ~]# hostnamectl set-hostname 'k8s-master' Perform the following steps on Master Node Step 1: Disable SELinux & setup firewall rules Installations Steps of Kubernetes 1.7 on CentOS 7 / RHEL 7 Pod – Pod can be defined as a multi-tier or group of containers that are deployed on a single worker node or docker host.In other words we can say it is used for port translation. Kube-Proxy – It routes the traffic to appropriate containers based on ip address and port number of the incoming request.Kubelet – It is an agent which runs on every worker node, it connects to docker and takes care of creating, starting, deleting containers.On Worker Nodes following components will be installed It is used by administrators to create pods, services etc. Kubectl utility – It is a command line utility which connects to API Server on port 6443.It stores configuration data of cluster and cluster state. etcd – It is a Key value pair data base.Controller Manager – Main Job of Controller manager is to monitor replication controllers and create pods to maintain desired state.Scheduler – It is a program on master node which performs the scheduling tasks like launching containers in worker nodes based on resource availability.API Server – It provides kubernetes API using Jason / Yaml over http, states of API objects are stored in etcd.On the Master Node following components will be installed One server will acts master node and rest two servers will be minion or worker nodes. In my setup I am taking three CentOS 7 servers with minimal installation. In this article we will install latest version of Kubernetes 1.7 on CentOS 7 / RHEL 7 with kubeadm utility. Kubeadm ( Multi Node Cluster in our own premises).Kops ( Multi node kubernetes setup into AWS ).Minikube ( It is a single node kubernetes cluster).
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