CKA Learning Series: Build K8s Cluster using Kubeadm in minutes !
--
CKA 2020 Exam Updates(Sep onwards)
Proctored exam, 15-20 hands on questions, 2 hours, 6 k8s clusters, K8s 1.19 and no multiple choice drama !CKA exam, tests your skills in specific domains of k8s platform. Creating/managing k8s cluster using kubeadm is one of primary requirement. I have recently passed this exam and In my opinion practising on kubeadm based cluster can help you to cover a big part of exam syllabus. I suggest create your own cluster using kubeadm and practise as much as possible to get through in first attempt. This blogpost is part of series which I will be publishing in coming days to help you pass the exam.
In this post we will cover the part in which we are building a k8s cluster using kubeadm.
What you need to start -
Free cloud account or Virtual Box
3 VMs
I am using 3 VMs named —
- node-1 [Ubuntu 18.x machine / master or controlplane]
- node-2 [Ubuntu 18.x machine / worker]
- node-3 [Ubuntu 18.x machine / worker]
What are the steps -
Perform these steps on all 3 VMs. These steps deploy required component for building k8s cluster using kubeadm.
Step 1: Configure iptables to receive bridged network traffic
# add following lines in /etc/ufw/sysctl.conf filenet/bridge/bridge-nf-call-ip6tables = 1
net/bridge/bridge-nf-call-iptables = 1
net/bridge/bridge-nf-call-arptables = 1
Step 2: Make sure you have installed ebtables and ethtool. If not please install
apt-get install ebtables ethtoolStep 3: Install HTTPS-TRANSPORT component
apt-get updateapt-get install -y apt-transport-https
Step 4: Install docker
apt-get install -y docker.io
