VirtualBox Cluster Deployment Project

tutorial4/resources/Vagrantfile

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+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+# https://developer.hashicorp.com/vagrant/docs/vagrantfile
+Vagrant.configure("2") do |config|
+
+  # Define the box that all nodes will use
+  # List of boxes available at [[https://vagrantcloud.com/search]]
+  # Choosing bento over generic as its more lightweight
+  config.vm.box = "bento/rockylinux-9"
+  # config.vm.synced_folder ".", "/vagrant", disabled: true
+  config.vm.synced_folder ".", "/vagrant"
+
+  # Here we define node specific settings - [[https://developer.hashicorp.com/vagrant/docs/multi-machine]]
+  config.vm.define "headnode", primary: true do |headnode|
+    headnode.vm.hostname = "headnode"
+
+    # Define a VirtualBox internal network - [[https://developer.hashicorp.com/vagrant/docs/providers/virtualbox/networking#virtualbox-internal-network]]
+    headnode.vm.network "private_network", ip: "10.0.0.1", virtualbox__intnet: "intnet"
+
+    # VirtualBox specific settings - [[https://developer.hashicorp.com/vagrant/docs/providers/virtualbox]]
+    headnode.vm.provider "virtualbox" do |vb|
+      vb.name = "headnode"
+      vb.cpus = 2
+      vb.memory = "2048"
+      vb.gui = false
+    end
+
+    # Run the head node shell script automatically
+    headnode.vm.provision "shell", path: "./headnode-setup.sh"
+    # If you want to do any scripting: [[https://developer.hashicorp.com/vagrant/docs/provisioning/shell]]
+    # If you want to use Ansible: [[https://developer.hashicorp.com/vagrant/docs/provisioning/ansible_intro]]
+  end
+
+  config.vm.define "computenode", autostart: false do |computenode|
+    computenode.vm.hostname = "computenode"
+
+    # Disable vagrant attempting to communicate with the VM on startup
+    # computenode.vm.communicator = :none
+
+    # ":adapter =>1" adds the internal network adapater to spot 1,
+    # replacing the default nat network adapter vagrant adds,
+    # ensuring that there is only the internal network adapter.
+    computenode.vm.network "private_network", ip: "10.0.0.2", virtualbox__intnet: "intnet"
+
+    computenode.vm.provider "virtualbox" do |vb|
+      vb.name = "computenode1"
+      vb.cpus = 4
+      vb.memory = "4096"
+      vb.gui = false
+    end
+
+    # Run the compute node shell script automatically
+    computenode.vm.provision "shell", path: "./computenode-setup.sh"
+  end
+end

tutorial4/resources/computenode-setup.sh

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+#!/bin/bash
+# Update system
+sudo dnf update -y
+
+# Install tools
+sudo dnf install -y net-tools iproute vim nfs-utils
+
+# Set hostname
+sudo hostnamectl set-hostname computenode
+
+# Detect NAT and internal network interfaces automatically
+NAT_IF=$(ip -o link show | awk -F': ' '{print $2}' | grep -E 'enp0s3|eth0' | head -n1)
+INT_IF=$(ip -o link show | awk -F': ' '{print $2}' | grep -E 'enp0s[0-9]+|eth[0-9]+' | tail -n1)
+
+# Disable NAT interface so it doesn't interfere
+sudo ip link set $NAT_IF down
+
+# Configure internal network
+sudo ip addr add 10.0.0.2/24 dev $INT_IF
+sudo ip link set $INT_IF up
+
+# Set default route via headnode
+sudo ip route add default via 10.0.0.1 dev $INT_IF
+
+# Add /etc/hosts entries for cluster nodes
+echo "10.0.0.1 headnode" | sudo tee -a /etc/hosts
+echo "10.0.0.2 computenode" | sudo tee -a /etc/hosts

tutorial4/resources/headnode-setup.sh

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+#!/bin/bash
+# Update system
+sudo dnf update -y
+
+# Install necessary tools
+sudo dnf install -y net-tools iproute traceroute vim nfs-utils iptables-services
+
+# Set hostname (optional if done in Vagrantfile)
+sudo hostnamectl set-hostname headnode
+
+# Configure internal network
+sudo ip addr add 10.0.0.1/24 dev enp0s8
+sudo ip link set enp0s8 up
+
+# Enable IP forwarding immediately and permanently
+sudo sysctl -w net.ipv4.ip_forward=1
+sudo bash -c "echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf"
+sudo sysctl -p
+
+# Clear existing rules to avoid conflicts
+sudo iptables -F
+sudo iptables -t nat -F
+sudo iptables -X
+
+# Set default policies
+sudo iptables -P FORWARD ACCEPT
+
+# NAT for compute nodes to reach the internet
+sudo iptables -t nat -A POSTROUTING -s 10.0.0.0/24 -o enp0s3 -j MASQUERADE
+sudo iptables -A FORWARD -i enp0s8 -o enp0s3 -j ACCEPT
+sudo iptables -A FORWARD -i enp0s3 -o enp0s8 -m state --state RELATED,ESTABLISHED -j ACCEPT
+
+# Save rules persistently
+sudo service iptables save
+sudo systemctl enable iptables
+sudo systemctl restart iptables
+
+# Add /etc/hosts entries for cluster nodes
+echo "10.0.0.1 headnode" | sudo tee -a /etc/hosts
+echo "10.0.0.2 computenode" | sudo tee -a /etc/hosts