#!/bin/bash

# Variables
#KUBERNETES_VERSION="1.28.2-00" # Cambia por la versión que necesites
USER="curso" # Usuario con acceso sudo

# Actualizar sistema
echo "Actualizando el sistema..."
sudo apt-get update && sudo apt-get upgrade -y

# Desactivar swap (requisito de Kubernetes)
echo "Desactivando swap..."
sudo swapoff -a
sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

# Configurar el repositorio de Kubernetes
echo "Agregando el repositorio de Kubernetes..."
sudo apt-get install -y apt-transport-https ca-certificates curl
# If the folder `/etc/apt/keyrings` does not exist, it should be created before the curl command, read the note below.
# sudo mkdir -p -m 755 /etc/apt/keyrings
curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.32/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
sudo chmod 644 /etc/apt/keyrings/kubernetes-apt-keyring.gpg # allow unprivileged APT programs to read this keyring

# This overwrites any existing configuration in /etc/apt/sources.list.d/kubernetes.list
echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.32/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list
sudo chmod 644 /etc/apt/sources.list.d/kubernetes.list   # helps tools such as command-not-found to work correctly


#curl -fsSL https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo gpg --dearmor -o /usr/share/keyrings/kubernetes-archive-keyring.gpg
#echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list

# Instalar Kubernetes
echo "Instalando Kubernetes (kubeadm, kubelet, kubectl)..."
sudo apt-get update
#sudo apt-get install -y kubelet=$KUBERNETES_VERSION kubeadm=$KUBERNETES_VERSION kubectl=$KUBERNETES_VERSION
sudo apt-get install -y kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl

# Habilitar módulos necesarios para Kubernetes
echo "Habilitando módulos del kernel..."
sudo modprobe overlay
sudo modprobe br_netfilters


# Configure persistent loading of modules
sudo tee /etc/modules-load.d/containerd.conf <<EOF
overlay
br_netfilter
EOF


# Install required packages
sudo apt install -y curl gnupg2 software-properties-common apt-transport-https ca-certificates

# Add Docker repo
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/trusted.gpg.d/docker-archive-keyring.gpg

sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

# Install containerd
sudo apt update
sudo apt install -y containerd.io

# Configure containerd and start service
sudo mkdir -p /etc/containerd
sudo containerd config default|sudo tee /etc/containerd/config.toml

# restart containerd
sudo systemctl restart containerd
sudo systemctl enable containerd
systemctl status  containerd


cat <<EOF | sudo tee /etc/sysctl.d/kubernetes.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF

sudo sysctl --system

# Instalar containerd
echo "Instalando containerd..."
sudo apt-get install -y containerd
sudo mkdir -p /etc/containerd
containerd config default | sudo tee /etc/containerd/config.toml

# Configurar containerd para usar systemd como driver de cgroup
sudo sed -i 's/SystemdCgroup = false/SystemdCgroup = true/' /etc/containerd/config.toml
sudo systemctl restart containerd
sudo systemctl enable containerd

sudo kubeadm config images pull