Puppet Class: nova::migration::libvirt

Defined in:
manifests/migration/libvirt.pp

Overview

Class: nova::migration::libvirt

Sets libvirt config that is required for migration

Parameters:

transport

(optional) Transport to use for live-migration. Valid options are ‘tcp’, ‘tls’, and ‘ssh’. Defaults to ‘tcp’

auth

(optional) Use this authentication scheme for remote libvirt connections. Valid options are none and sasl. Defaults to ‘none’

listen_address

(optional) Bind libvirtd tcp/tls socket to the given address. Defaults to undef (bind to all addresses)

live_migration_inbound_addr

(optional) The IP address or hostname to be used as the target for live migration traffic. Defaults to $::os_service_default

live_migration_tunnelled

(optional) Whether to use tunnelled migration, where migration data is transported over the libvirtd connection. If True, we use the VIR_MIGRATE_TUNNELLED migration flag, avoiding the need to configure the network to allow direct hypervisor to hypervisor communication. If False, use the native transport. If not set, Nova will choose a sensible default based on, for example the availability of native encryption support in the hypervisor. Defaults to $::os_service_default

live_migration_with_native_tls

(optional) This option will allow both migration stream (guest RAM plus device state) and disk stream to be transported over native TLS, i.e. TLS support built into QEMU. Prerequisite: TLS environment is configured correctly on all relevant Compute nodes. This means, Certificate Authority (CA), server, client certificates, their corresponding keys, and their file permisssions are in place, and are validated. Defaults to $::os_service_default

live_migration_completion_timeout

(optional) Time to wait, in seconds, for migration to successfully complete transferring data before aborting the operation. Value is per GiB of guest RAM + disk to be transferred, with lower bound of a minimum of 2 GiB. Set to 0 to disable timeouts. Defaults to $::os_service_default

override_uuid

(optional) Set uuid not equal to output from dmidecode (boolean) Defaults to false

configure_libvirt

(optional) Whether or not configure libvirt bits. Defaults to true.

configure_nova

(optional) Whether or not configure libvirt bits. Defaults to true.

client_user

(optional) Remote user to connect as. Only applies to ssh transport. Defaults to undef (root)

client_port

(optional) Remote port to connect to. Defaults to undef (default port for the transport)

client_extraparams

(optional) Hash of additional params to append to the live-migration uri See libvirt.org/guide/html/Application_Development_Guide-Architecture-Remote_URIs.html Defaults to {}

ca_file

(optional) Specifies the CA certificate that the TLS transport will use. Note that this is only used if the TLS transport is enabled via the “transport” option. Defaults to undef

crl_file

(optional) Specifies the CRL file that the TLS transport will use. Note that this is only used if the TLS transport is enabled via the “transport” option. Defaults to undef

Parameters:

  • transport (Any) (defaults to: undef)
  • auth (Any) (defaults to: 'none')
  • listen_address (Any) (defaults to: undef)
  • live_migration_inbound_addr (Any) (defaults to: $::os_service_default)
  • live_migration_tunnelled (Any) (defaults to: $::os_service_default)
  • live_migration_with_native_tls (Any) (defaults to: $::os_service_default)
  • live_migration_completion_timeout (Any) (defaults to: $::os_service_default)
  • override_uuid (Any) (defaults to: false)
  • configure_libvirt (Any) (defaults to: true)
  • configure_nova (Any) (defaults to: true)
  • client_user (Any) (defaults to: undef)
  • client_port (Any) (defaults to: undef)
  • client_extraparams (Any) (defaults to: {})
  • ca_file (Any) (defaults to: undef)
  • crl_file (Any) (defaults to: undef) 


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# File 'manifests/migration/libvirt.pp', line 92

class nova::migration::libvirt(
  $transport                         = undef,
  $auth                              = 'none',
  $listen_address                    = undef,
  $live_migration_inbound_addr       = $::os_service_default,
  $live_migration_tunnelled          = $::os_service_default,
  $live_migration_with_native_tls    = $::os_service_default,
  $live_migration_completion_timeout = $::os_service_default,
  $override_uuid                     = false,
  $configure_libvirt                 = true,
  $configure_nova                    = true,
  $client_user                       = undef,
  $client_port                       = undef,
  $client_extraparams                = {},
  $ca_file                           = undef,
  $crl_file                          = undef,
){

  include nova::deps

  if $transport {
    $transport_real = $transport
  } else {
    $transport_real = 'tcp'
  }

  validate_legacy(Enum['tcp', 'tls', 'ssh'], 'validate_re', $transport_real,
    [['^tcp$', '^tls$', '^ssh$'], 'Valid options for transport are tcp, tls, ssh.'])
  validate_legacy(Enum['sasl', 'none'], 'validate_re', $auth,
    [['^sasl$', '^none$'], 'Valid options for auth are none and sasl.'])

  if $transport_real == 'tls' {
    $listen_tls = '1'
    $listen_tcp = '0'
  } elsif $transport_real == 'tcp' {
    $listen_tls = '0'
    $listen_tcp = '1'
  } else {
    $listen_tls = '0'
    $listen_tcp = '0'
  }

  if $configure_nova {
    if $transport_real == 'ssh' {
      if $client_user {
        $prefix =  "${client_user}@"
      } else {
        $prefix = ''
      }
    } else {
      $prefix = ''
    }

    if $client_port {
      $postfix = ":${client_port}"
    } else {
      $postfix = ''
    }

    if $client_extraparams != {} {
      $extra_params_before_python_escape = join(uriescape(join_keys_to_values($client_extraparams, '=')), '&')
      # Must escape % as nova interprets it incorrectly.
      $extra_params = sprintf('?%s', regsubst($extra_params_before_python_escape, '%', '%%', 'G'))
    } else {
      $extra_params =''
    }

    $live_migration_uri = "qemu+${transport_real}://${prefix}%s${postfix}/system${extra_params}"

    nova_config {
      'libvirt/live_migration_uri':                value => $live_migration_uri;
      'libvirt/live_migration_tunnelled':          value => $live_migration_tunnelled;
      'libvirt/live_migration_with_native_tls':    value => $live_migration_with_native_tls;
      'libvirt/live_migration_completion_timeout': value => $live_migration_completion_timeout;
      'libvirt/live_migration_inbound_addr':       value => $live_migration_inbound_addr;
    }
  }

  if $configure_libvirt {
    Anchor['nova::config::begin']
    -> Libvirtd_config<||>
    -> File_line<| tag == 'libvirt-file_line'|>
    -> Anchor['nova::config::end']

    Libvirtd_config<||>
    ~> Service['libvirt']

    File_line<| tag == 'libvirt-file_line' |>
    ~> Service['libvirt']

    if $override_uuid {
      if ! $::libvirt_uuid {
        $host_uuid = generate('/bin/cat', '/proc/sys/kernel/random/uuid')
        file { '/etc/libvirt/libvirt_uuid':
          content => $host_uuid,
          require => Package['libvirt'],
        }
      } else {
        $host_uuid = $::libvirt_uuid
      }

      augeas { 'libvirt-conf-uuid':
        context => '/files/etc/libvirt/libvirtd.conf',
        changes => [
          "set host_uuid ${host_uuid}",
        ],
        notify  => Service['libvirt'],
        require => Package['libvirt'],
      }
    }

    libvirtd_config {
      'listen_tls': value => $listen_tls;
      'listen_tcp': value => $listen_tcp;
    }

    if $transport_real == 'tls' {
      libvirtd_config {
        'auth_tls': value => "\"${auth}\"";
      }
      if $ca_file {
        libvirtd_config {
          'ca_file': value => "\"${ca_file}\"";
        }
      }
      if $crl_file {
        libvirtd_config {
          'crl_file': value => "\"${crl_file}\"";
        }
      }
    } elsif $transport_real == 'tcp' {
      libvirtd_config {
        'auth_tcp': value => "\"${auth}\"";
      }
    }

    if $listen_address {
      libvirtd_config {
        'listen_addr': value => "\"${listen_address}\"";
      }
    }

    case $::osfamily {
      'RedHat': {
        if $transport_real != 'ssh' {
          file_line { '/etc/sysconfig/libvirtd libvirtd args':
            path  => '/etc/sysconfig/libvirtd',
            line  => 'LIBVIRTD_ARGS="--listen"',
            match => '^LIBVIRTD_ARGS=',
            tag   => 'libvirt-file_line',
          }
        }
      }

      'Debian': {
        if $transport_real != 'ssh' {
          file_line { "/etc/default/${::nova::compute::libvirt::libvirt_service_name} libvirtd opts":
            path  => "/etc/default/${::nova::compute::libvirt::libvirt_service_name}",
            line  => 'libvirtd_opts="-l"',
            match => 'libvirtd_opts=',
            tag   => 'libvirt-file_line',
          }
        }
      }

      default:  {
        warning("Unsupported osfamily: ${::osfamily}, make sure you are configuring this yourself")
      }
    }
  }
}