From previous chapter, we were talking about the infrastructure which we're gonna build. In this chapter, let’s install & setup a k8s cluster, with 2 nodes!
We will start with the Master server first
For this Lab, I’m gonna use Virtual machines to simulate servers. I’m using macOS Catalina 10.15.2, VMWare Fusion Pro 11.5.1, with 3 Ubuntu 18.04 VMs (2 CPUs, 1GB RAM, bridged network):
- kube: master (IP: 192.168.1.33)
- kube1: node 1 (IP: 192.168.1.34)
- kube2: node 2 (IP: 192.168.1.35)
Before everything, note that:
- Kubernetes won’t run if swap enabled
- Kubernetes master-nodes communication will require some ports opened
- Kubernetes could face some problems with SELINUX
Alright, let’s start with the Master VM.
Master component
$ sudo su
Disable swap
$ swapoff -a
Also don’t forget to disable swap on reboot, by editing /etc/fstab
file
(Optional) Set hostname
$ hostnamectl set-hostname kube
(Optional) Set static IP
Edit file /etc/netplan/50-cloud-init.yaml
to set static IP
/etc/netplan/50-cloud-init.yaml
network:
renderer: networkd
ethernets:
ens33:
dhcp4: no
addresses: [192.168.1.33/24]
gateway4: 192.168.1.1
nameservers:
addresses: [8.8.8.8,8.8.4.4]
version: 2
Update apt
$ apt update
Install Docker
$ apt install docker.io
Auto start Docker
$ systemctl enable docker && systemctl start docker
Install Kubeadm
$ curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add
$ apt-add-repository "deb http://apt.kubernetes.io/ kubernetes-xenial main"
$ apt install kubeadm
Init Kubeadm
$ kubeadm init --pod-network-cidr=10.244.0.0/16
After Kubeadm inited, it will give you a command with token to run it on Node servers. It looks like this:
kubeadm join 192.168.1.33:6443 --token xxx --discovery-token-ca-cert-hash xxx
Create k8s config place
$ mkdir -p $HOME/.kube
$ sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
$ sudo chown $(id -u):$(id -g) $HOME/.kube/config
Create Virtual network
We’re gonna use flannel for Virtual network
$ kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
(Optional) Create Docker registry
For this Lab, we’re gonna setup a local insecure Docker registry to store our built images.
$ docker run -d -p 5000:5000 --name registry registry:2
For security reasons, Docker doesn’t want to connect to an insecure registry.
To allow Docker to use insecure registry, you need to:
Edit file /etc/docker/daemon.json
/etc/docker/daemon.json
{
"insecure-registries" : ["192.168.1.33:5000"]
}
Or file /etc/default/docker
/etc/default/docker
DOCKER_OPTS="--insecure-registry 192.168.1.33:5000"
Restart Docker
$ service docker restart
(Remember 192.168.1.33 is our Master server’s IP)
Install metrics server
$ cd /etc
$ git clone https://github.com/kubernetes-incubator/metrics-server.git
$ cd metrics-server/
Edit file /etc/metrics-server/deploy/1.8+/metrics-server-deployment.yaml
- name: metrics-server
image: k8s.gcr.io/metrics-server-amd64:v0.3.6
args:
- --cert-dir=/tmp
- --secure-port=4443
command:
- /metrics-server
- --metric-resolution=5s
- --kubelet-insecure-tls
- --kubelet-preferred-address-types=InternalIP
Apply it
kubectl apply -f /etc/metrics-server/deploy/1.8+/metrics-server-deployment.yaml
Great! you have a working Master server now. Now we're gonna setup the Node servers and connect them together, just 5 minutes ahead :)
Node component
Let’s start on Kube1 (192.168.1.34)
$ sudo su
Disable swap
$ swapoff -a
To disable swap on reboot, edit /etc/fstab
file
(Optional) Set hostname
$ hostnamectl set-hostname kube1
(Optional) Set static IP
Edit file /etc/netplan/50-cloud-init.yaml
to set static IP
/etc/netplan/50-cloud-init.yaml
network:
renderer: networkd
ethernets:
ens33:
dhcp4: no
addresses: [192.168.1.34/24]
gateway4: 192.168.1.1
nameservers:
addresses: [8.8.8.8,8.8.4.4]
version: 2
Update apt
$ apt update
Install Docker
$ apt install docker.io
**Auto start Docker
$ systemctl enable docker && systemctl start docker
Install Kubeadm
$ curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add
$ apt-add-repository "deb http://apt.kubernetes.io/ kubernetes-xenial main"
$ apt install kubeadm
Join this node to the master
This command was generated when you setup your Master server
$ kubeadm join xxx:6443 --token xxx --discovery-token-ca-cert-hash xxx
(Optional) Docker registry
As I told, for some security reasons, Docker doesn’t want to connect to an insecure registry.
To allow Docker to use insecure registry, you need to:
Edit file /etc/docker/daemon.json
/etc/docker/daemon.json
{
"insecure-registries" : ["192.168.1.33:5000"]
}
Or edit file /etc/default/docker
/etc/default/docker
DOCKER_OPTS="--insecure-registry 192.168.1.33:5000"
Restart Docker
$ service docker restart
Repeat the same, for Kube2 (don’t forget the hostname and static IP)
Done! Now you have a working k8s cluster with Master and 2 Nodes, in the final chapter, we will build our infrastructure on this cluter. And trust me, it's not harder than playing with Lego blocks
The final chapter is here
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