/usr/lib/ruby/vendor_ruby/ohai/plugins/linux/virtualization.rb is in ohai 8.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Author:: Thom May (<thom@clearairturbulence.org>)
# Copyright:: Copyright (c) 2009 Opscode, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require 'ohai/util/file_helper'
include Ohai::Util::FileHelper
Ohai.plugin(:Virtualization) do
provides "virtualization"
def lxc_version_exists?
which('lxc-version')
end
def docker_exists?
which('docker')
end
collect_data(:linux) do
virtualization Mash.new unless virtualization
virtualization[:systems] = Mash.new unless virtualization[:systems]
# if it is possible to detect paravirt vs hardware virt, it should be put in
# virtualization[:mechanism]
## Xen
# /proc/xen is an empty dir for EL6 + Linode Guests
if File.exists?("/proc/xen")
virtualization[:system] = "xen"
# Assume guest
virtualization[:role] = "guest"
virtualization[:systems][:xen] = "guest"
# This file should exist on most Xen systems, normally empty for guests
if File.exists?("/proc/xen/capabilities")
if File.read("/proc/xen/capabilities") =~ /control_d/i
virtualization[:role] = "host"
virtualization[:systems][:xen] = "host"
end
end
end
# Xen Notes:
# - cpuid of guests, if we could get it, would also be a clue
# - may be able to determine if under paravirt from /dev/xen/evtchn (See OHAI-253)
# - EL6 guests carry a 'hypervisor' cpu flag
# - Additional edge cases likely should not change the above assumptions
# but rather be additive - btm
# Detect from kernel module
if File.exists?("/proc/modules")
modules = File.read("/proc/modules")
if modules =~ /^kvm/
virtualization[:system] = "kvm"
virtualization[:role] = "host"
virtualization[:systems][:kvm] = "host"
elsif modules =~ /^vboxdrv/
virtualization[:system] = "vbox"
virtualization[:role] = "host"
virtualization[:systems][:vbox] = "host"
elsif modules =~ /^vboxguest/
virtualization[:system] = "vbox"
virtualization[:role] = "guest"
virtualization[:systems][:vbox] = "guest"
end
end
# Detect KVM/QEMU from cpuinfo, report as KVM
# We could pick KVM from 'Booting paravirtualized kernel on KVM' in dmesg
# 2.6.27-9-server (intrepid) has this / 2.6.18-6-amd64 (etch) does not
# It would be great if we could read pv_info in the kernel
# Wait for reply to: http://article.gmane.org/gmane.comp.emulators.kvm.devel/27885
if File.exists?("/proc/cpuinfo")
if File.read("/proc/cpuinfo") =~ /QEMU Virtual CPU|Common KVM processor|Common 32-bit KVM processor/
virtualization[:system] = "kvm"
virtualization[:role] = "guest"
virtualization[:systems][:kvm] = "guest"
end
end
# Detect OpenVZ / Virtuozzo.
# http://wiki.openvz.org/BC_proc_entries
if File.exists?("/proc/bc/0")
virtualization[:system] = "openvz"
virtualization[:role] = "host"
virtualization[:systems][:openvz] = "host"
elsif File.exists?("/proc/vz")
virtualization[:system] = "openvz"
virtualization[:role] = "guest"
virtualization[:systems][:openvz] = "guest"
end
# http://www.dmo.ca/blog/detecting-virtualization-on-linux
if File.exists?("/usr/sbin/dmidecode")
so = shell_out("dmidecode")
case so.stdout
when /Manufacturer: Microsoft/
if so.stdout =~ /Product Name: Virtual Machine/
virtualization[:system] = "virtualpc"
virtualization[:role] = "guest"
virtualization[:systems][:virtualpc] = "guest"
end
when /Manufacturer: VMware/
if so.stdout =~ /Product Name: VMware Virtual Platform/
virtualization[:system] = "vmware"
virtualization[:role] = "guest"
virtualization[:systems][:vmware] = "guest"
end
when /Manufacturer: Xen/
if so.stdout =~ /Product Name: HVM domU/
virtualization[:system] = "xen"
virtualization[:role] = "guest"
virtualization[:systems][:xen] = "guest"
end
when /Manufacturer: Oracle Corporation/
if so.stdout =~ /Product Name: VirtualBox/
virtualization[:system] = "vbox"
virtualization[:role] = "guest"
virtualization[:systems][:vbox] = "guest"
end
when /Product Name: OpenStack/
virtualization[:system] = "openstack"
virtualization[:role] = "guest"
virtualization[:systems][:openstack] = "guest"
else
nil
end
end
# Detect Linux-VServer
if File.exists?("/proc/self/status")
proc_self_status = File.read("/proc/self/status")
vxid = proc_self_status.match(/^(s_context|VxID):\s*(\d+)$/)
if vxid and vxid[2]
virtualization[:system] = "linux-vserver"
if vxid[2] == "0"
virtualization[:role] = "host"
virtualization[:systems]["linux-vserver"] = "host"
else
virtualization[:role] = "guest"
virtualization[:systems]["linux-vserver"] = "guest"
end
end
end
# Detect LXC/Docker
#
# /proc/self/cgroup will look like this inside a docker container:
# <index #>:<subsystem>:/lxc/<hexadecimal container id>
#
# /proc/self/cgroup could have a name including alpha/digit/dashes
# <index #>:<subsystem>:/lxc/<named container id>
#
# /proc/self/cgroup could have a non-lxc cgroup name indicating other uses
# of cgroups. This is probably not LXC/Docker.
# <index #>:<subsystem>:/Charlie
#
# A host which supports cgroups, and has capacity to host lxc containers,
# will show the subsystems and root (/) namespace.
# <index #>:<subsystem>:/
#
# Full notes, https://tickets.opscode.com/browse/OHAI-551
# Kernel docs, https://www.kernel.org/doc/Documentation/cgroups
if File.exists?("/proc/self/cgroup")
if File.read("/proc/self/cgroup") =~ %r{^\d+:[^:]+:/(lxc|docker)/.+$}
virtualization[:system] = $1
virtualization[:role] = "guest"
virtualization[:systems][$1.to_sym] = "guest"
elsif lxc_version_exists? && File.read("/proc/self/cgroup") =~ %r{\d:[^:]+:/$}
# lxc-version shouldn't be installed by default
# Even so, it is likely we are on an LXC capable host that is not being used as such
# So we're cautious here to not overwrite other existing values (OHAI-573)
unless virtualization[:system] && virtualization[:role]
virtualization[:system] = "lxc"
virtualization[:role] = "host"
end
# In general, the 'systems' framework from OHAI-182 is less susceptible to conflicts
# But, this could overwrite virtualization[:systems][:lxc] = "guest"
# If so, we may need to look further for a differentiator (OHAI-573)
virtualization[:systems][:lxc] = "host"
end
elsif File.exists?("/.dockerenv") || File.exists?("/.dockerinit")
virtualization[:system] = "docker"
virtualization[:role] = "guest"
virtualization[:systems][:docker] = "guest"
end
end
end
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