How to Deploy an Express Kubernetes Cluster with Ansible

Prerequisites

• Ansible server

IP address: 172.xx.xx.xx

• Express Kubernetes Cluster server

OS: Ubuntu 16.04 LTS or CentOS 7

Disk: 120 GB SSD + 960 GB SSD + 2TB SATA

Internet access is available for the server to download software binaries

Password-less SSH has to be enabled for the root user on the server

Preparing Express Kubernetes Cluster Server

Set up disks

1.Create disk mount directory

mkdir /data

mkdir /backup

2.Get disks information

3.Create disk partitions /dev/sdb and /dev/sdc

4.Check the new disk partitions

fdisk -l

5.Formatting the new partitions

6.Mount the new partitions

7.Check the file system information

8.Set up the new partition mount automatically

vi /etc/fstab

Install Python2.7 and enable root user

For Ubuntu 16:

1.Install python2.7

kuber$ sudo apt update
kuber$ sudo apt install python2.7 -y
kuber$ sudo ln -s /usr/bin/python2.7 /usr/bin/python  

2.Enable root user

kuber$ sudo passwd root
kuber$ sudo sed -i 's/prohibit-password/yes/' /etc/ssh/sshd_config
kuber$ sudo service ssh restart

For Centos 7:

1.Install python2.7

root# yum install epel-release -y
root# yum update -y
root# yum install python -y

2.In Centos7, the root user has been enabled by default.

Preparing Ansible server and deploying Express Kubernetes Cluster

Log in to Ansible server

IP address: 172.*

Username: administrator

Password: Da*

Enable password-less SSH

Copy the public key from Ansible server to Express Kubernetes Cluster server.

root# ssh-copy-id 198.*

Modify the Ansible inventory file

vi /deploy/kubeclusters/express/hosts

You just need to change the Express Kubernetes Cluster servers’ IP.

Deploy the Kubernetes cluster

root# cd /deploy/kubeclusters/express
root# ansible-playbook deploy.yml

Verifying Installation

On Express Kubernetes Cluster server, run ‘kubectl version’ in the console to view the version of Kubernetes.

On Express Kubernetes Cluster server, run ‘kubectl get componentstatus’ in the console to check the status of Kubernetes components.

Run ‘kubectl get node’ to view the node status.

Run ‘kubectl get pod --all-namespaces’ to get the status of all pods.

Verifying in Kubernetes dashboard

Open https://198.x.x.x:6443/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy in your browser and select Token option

The Dashboard token can be retrieved by running the following command

root# Dashboard_Secret=`kubectl get secret -n kube-system|grep kubernetes-dashboard-token|awk '{print $1}'`
root# kubectl describe secret -n kube-system ${Dashboard_Secret} |sed -n '$p'|awk '{print $NF}'

Verifying in Grafana

Open http://198.X.X.X:30002

Username: admin

Password: admin

Getting Express Kubernetes Cluster info

root# cd /deploy/kubeclusters/express
root# sh get_k8s_info.sh