Installazione KuberAltro

Prereq: Iso Oracle linux 8.9 - 4VCPU 8Gbyte di RAM - 32Gbyte disco

Tutto in inglese solo tastiera e Timezone

Software selection: Minimal Install

Partizione: ol-root 30GiB - /boot 1024Mbyte

Settare in installazione IP e Hostname.

Settare Root Password

dnf update -y;
systemctl disable firewalld;
systemctl stop firewalld;
sudo setenforce 0;
sudo sed -i 's/^SELINUX=enforcing$/SELINUX=disabled/' /etc/selinux/config;
dnf install net-tools -y;
dnf install curl -y;
dnf install wget -y;
dnf install -y iproute-tc;
dnf install dnsutils -y
sudo yum install -y yum-utils;
reboot

sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo;
sudo yum install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin;
sudo systemctl start docker;
sudo systemctl enable docker;
sudo docker run hello-world;

Mettere a posto il file hosts con la risoluzione dei nodi es.:

172.16.1.200 kuber01 kuber01.gazzi.net
172.16.1.201 kuber02 kuber02.gazzi.net

abilitare:

sudo sed -i 's/^disabled_plugins = \["cri"\]$/enabled_plugins = \["cri"\]/' /etc/containerd/config.toml
reboot

curl -sfL https://get.k3s.io | sh -
sudo systemctl status k3s
export KUBECONFIG=/etc/rancher/k3s/k3s.yaml
echo 'export KUBECONFIG=/etc/rancher/k3s/k3s.yaml' >> ~/.bashrc
source ~/.bashrc

Da Verificare:

sudo k3s server --disable traefik

Rancher:

docker run -d --restart=unless-stopped -p 80:80 -p 443:443 --name rancher rancher/rancher:latest

Kubernetes Dashboard:

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.6.0/aio/deploy/recommended.yaml

# dashboard-adminuser.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin-user
  namespace: kubernetes-dashboard
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: admin-user
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: admin-user
  namespace: kubernetes-dashboard

kubectl apply -f dashboard-adminuser.yaml

kubectl -n kubernetes-dashboard create token admin-user

kubectl proxy

http://localhost:8001/api/v1/namespaces/kubernetes-dashboard/services/https:kubernetes-dashboard:/proxy/

---

Aggiunta nodo-

sudo cat /var/lib/rancher/k3s/server/node-token

curl -sfL https://get.k3s.io | K3S_URL=https://172.16.1.200:6443 K3S_TOKEN=K10abcde12345fghijklmnopqrstuv sh -

es. curl -sfL https://get.k3s.io | K3S_URL=https://172.16.1.200:6443 K3S_TOKEN=K10abcde12345fghijklmnopqrstuv sh -

[root@kuber01 ~]# curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 [root@kuber01 ~]# chmod 700 get_helm.sh [root@kuber01 ~]# ./get_helm.sh [WARNING] Could not find git. It is required for plugin installation. Downloading https://get.helm.sh/helm-v3.15.0-linux-amd64.tar.gz Verifying checksum... Done. Preparing to install helm into /usr/local/bin helm installed into /usr/local/bin/helm