Create Vagrant environment with shared MUNGE key

.gitignore

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+munge.key
+nodes.rb
+.settings.yml
+.vagrant

Vagrantfile

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+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+# Load override settings
+require 'yaml'
+settings_path = '.settings.yml'
+settings = {}
+
+if File.exist?(settings_path)
+  settings = YAML.load_file(settings_path)
+end
+
+# Default Vagrant settings
+VAGRANT_BOX = settings['VAGRANT_BOX'] || 'debian/bookworm64'
+VAGRANT_CPU = settings['VAGRANT_CPU'] || 2
+VAGRANT_MEM = settings['VAGRANT_MEM'] || 2048
+SSH_FORWARD = settings['SSH_FORWARD'] || false
+
+# Default Slurm settings
+SLURM_NODES  = settings['SLURM_NODES']  || 4
+JOIN_TIMEOUT = settings['JOIN_TIMEOUT'] || 60
+
+# Node settings overrides
+if File.exist?('nodes.rb')
+  require_relative 'nodes.rb'
+else
+  # Using all defaults
+  NODES = {}
+end
+
+HOSTS = Array(1..SLURM_NODES)
+Vagrant.configure(2) do |vm_config|
+  HOSTS.each do |count|
+    vm_config.vm.define "node#{count}" do |config|
+      config.vm.hostname = "node#{count}"
+      config.vm.box = NODES.dig("node#{count}", 'BOX') || VAGRANT_BOX
+      config.ssh.forward_agent =
+        NODES.dig("node#{count}", 'SSH') || SSH_FORWARD
+
+      # Libvirt
+      config.vm.provider :libvirt do |virt|
+        virt.memory = NODES.dig("node#{count}", 'MEM') || VAGRANT_MEM
+        virt.cpus = NODES.dig("node#{count}", 'CPU') || VAGRANT_CPU
+      end
+
+      # VirtualBox
+      config.vm.provider :virtualbox do |vbox|
+        vbox.memory = NODES.dig("node#{count}", 'MEM') || VAGRANT_MEM
+        vbox.cpus = NODES.dig("node#{count}", 'CPU') || VAGRANT_CPU
+      end
+
+      # Install and Setup Slurm
+      config.vm.provision "shell", inline: <<-SHELL
+        /bin/bash /vagrant/provision.sh
+      SHELL
+    end
+  end
+end

provision.sh

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+#!/bin/bash
+
+#######################################
+### Install and setup Slurm cluster ###
+#######################################
+
+# Print commands and exit on error
+set -xe
+
+# Prevents interactive prompts during package installation
+export DEBIAN_FRONTEND=noninteractive
+
+# Keep system clocks in sync
+apt-get update
+apt-get install -y chrony
+systemctl start chrony
+systemctl enable chrony
+
+# Install MUNGE
+apt-get update
+apt-get install -y munge
+
+# Create a dedicated non-privileged user account for MUNGE
+getent group munge > /dev/null || groupadd -r -g 900 munge
+id -u munge &>/dev/null || \
+  useradd -r -u 900 -g munge -d /var/lib/munge -s /usr/sbin/nologin munge
+
+# node1 = manager
+if [ "$(hostname)" == "node1" ]; then
+  # Create common MUNGE key on the manager node
+  if [ ! -f /etc/munge/munge.key ]; then
+    sudo -u munge /usr/sbin/mungekey --verbose
+  fi
+
+  # Set MUNGE key perms
+  chmod 600 /etc/munge/munge.key
+
+  # Copy to shared directory for other nodes
+  cp /etc/munge/munge.key /vagrant/munge.key
+
+  # Enable/start/test munge service
+  systemctl enable munge.service
+  systemctl start munge.service
+  munge -n | unmunge
+else
+  # Initial delay
+  sleep 5
+
+  # Waits JOIN_TIMEOUT of seconds to find the munge.key file before giving up
+  START_TIME="$(date +%s)"
+  # Wait until the munge.key can be found via Vagrant provider file sharing /vagrant
+  while [ ! -f /vagrant/munge.key ]; do
+    CURRENT_TIME="$(date +%s)"
+    DIFF_TIME="$((CURRENT_TIME - START_TIME))"
+
+    # Timeout
+    if [ "$DIFF_TIME" -ge "$JOIN_TIMEOUT" ]; then
+      echo "[ERROR]: $(hostname) waited $DIFF_TIME/$JOIN_TIMEOUT seconds"
+      exit 1
+    fi
+
+    # Waiting
+    echo "Waiting ($DIFF_TIME/$JOIN_TIMEOUT seconds) for /vagrant/munge.key file"
+    sleep 10
+  done
+
+  # Enable/start/test munge service
+  cp /vagrant/munge.key /etc/munge/munge.key
+  systemctl enable munge.service
+  systemctl start munge.service
+  munge -n | unmunge
+fi