Realtime console-based vSphere cluster usage monitoring with Ruby

show-vmware-host-usage.rb

#!/usr/bin/ruby

require 'rubygems'
require 'yaml'
require 'rbvmomi'
require 'ruby-progressbar'

def getStats()
  datacenter = $vim.serviceInstance.find_datacenter

  datacenter.hostFolder.children.each do |folder|
    if ARGV[0]
      next unless ARGV[0] == folder.name
    end

    print folder.name, "\n"
    folder.name.length.times { print '-' }
    print "\n"

    folder.host.each do |host|
      print host.name, "\n"

      sta = host.overallStatus
      con = host.runtime.connectionState
      mnt = host.runtime.inMaintenanceMode

      if host.summary.quickStats.overallCpuUsage and host.hardware.cpuInfo.numCpuCores and host.hardware.cpuInfo.hz
        cpu_val = host.summary.quickStats.overallCpuUsage / ( ( host.hardware.cpuInfo.numCpuCores ) * ( host.hardware.cpuInfo.hz / 102400000 ) )
      else
        cpu_val = 0
      end
      cpu_val = 100 if cpu_val > 100
      cpu = ProgressBar.create( :title => 'cpu', :length => 40, :progress_mark => "\u2593", :remainder_mark => "\u2591" )
      cpu_val.times { cpu.increment }
      print cpu, "  status: #{sta} (#{con})\n"

      if host.summary.quickStats.overallMemoryUsage and host.hardware.memorySize
        mem_val = ( host.summary.quickStats.overallMemoryUsage * 1024 * 1024 ) * 100 / ( host.hardware.memorySize )
      else
        mem_val = 0
      end
      mem_val = 100 if mem_val > 100
      mem = ProgressBar.create( :title => 'mem', :length => 40, :progress_mark => "\u2593", :remainder_mark => "\u2591" )
      mem_val.times { mem.increment }
      print mem, "  maintenance mode: #{mnt}\n"

      print "\n"
    end
  end
end

fog_file = File.expand_path("~/.fog")
fog_data = YAML.load_file(fog_file)[:default]

$vim = RbVmomi::VIM.connect(
  :host     => fog_data[:vsphere_server],
  :user     => fog_data[:vsphere_username],
  :password => fog_data[:vsphere_password],
  :ssl      => true,
  :insecure => true,
  :rev      => '5.1'
)

getStats()

$vim.close

show-vmware-host-usage.rb output

$ show-vmware-host-usage.rb acceptance1

acceptance1
-----------
opdx-a0-chassis5-3.example.com
cpu: |░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░|  status: green (disconnected)
mem: |░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░|  maintenance mode: true

opdx-a0-chassis5-2.example.com
cpu: |▓▓▓▓░░░░░░░░░░░░░░░░░░░░░░░░░░░░░|  status: green (connected)
mem: |▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░░░░░░░░░░░░░░|  maintenance mode: false

opdx-a0-chassis5-4.example.com
cpu: |▓▓▓░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░|  status: green (connected)
mem: |▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░░░░░░░░░░░░|  maintenance mode: false

opdx-a0-chassis5-6.example.com
cpu: |▓▓▓▓▓▓▓▓▓▓░░░░░░░░░░░░░░░░░░░░░░░|  status: green (connected)
mem: |▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░░░░░░░░░░░░░░░|  maintenance mode: false

opdx-a0-chassis5-8.example.com
cpu: |▓▓▓▓▓▓░░░░░░░░░░░░░░░░░░░░░░░░░░░|  status: green (connected)
mem: |▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░░░░░░░░░░░░|  maintenance mode: false

opdx-a2-chassis6-1.example.com
cpu: |▓▓▓▓▓░░░░░░░░░░░░░░░░░░░░░░░░░░░░|  status: green (connected)
mem: |▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░░░░░░░░░░░░░|  maintenance mode: false

opdx-a2-chassis6-3.example.com
cpu: |▓▓▓▓▓▓░░░░░░░░░░░░░░░░░░░░░░░░░░░|  status: green (connected)
mem: |▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░░░░░░░░░░░░░░░░|  maintenance mode: false

opdx-a2-chassis6-4.example.com
cpu: |▓▓▓▓░░░░░░░░░░░░░░░░░░░░░░░░░░░░░|  status: green (connected)
mem: |▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░░░░░░░░░░░░░░|  maintenance mode: false

opdx-a0-chassis5-1.example.com
cpu: |▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░░░░░░░░░░░░░░░░░░|  status: green (connected)
mem: |▓▓▓▓▓▓▓▓▓▓░░░░░░░░░░░░░░░░░░░░░░░|  maintenance mode: false

opdx-a0-chassis5-7.example.com
cpu: |▓▓▓▓▓░░░░░░░░░░░░░░░░░░░░░░░░░░░░|  status: green (connected)
mem: |▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░░░░░░░░░░░░░░░░|  maintenance mode: false

opdx-a2-chassis6-2.example.com
cpu: |▓▓▓▓▓▓▓▓░░░░░░░░░░░░░░░░░░░░░░░░░|  status: green (connected)
mem: |▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░░░░░░░░░░░░░░░|  maintenance mode: false