Puppet Class: nova::migration::libvirt

Inherits:
nova::compute::libvirt::version
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

live_migration_timeout_action

(optional) This option will be used to determine what action will be taken against a VM after live_migration_completion_timeout expires. By default, the live migrate operation will be aborted after completion timeout. If it is set to force_complete, the compute service will either pause the VM or trigger post-copy depending on if post copy is enabled and available Defaults to $::os_service_default

live_migration_permit_post_copy

(optional) This option allows nova to switch an on-going live migration to post-copy mode, i.e., switch the active VM to the one on the destination node before the migration is complete, therefore ensuring an upper bound on the memory that needs to be transferred. Post-copy requires libvirt>=1.3.3 and QEMU>=2.5.0. Defaults to $::os_service_default

live_migration_permit_auto_converge

(optional) This option allows nova to start live migration with auto converge on. Auto converge throttles down CPU if a progress of on-going live migration is slow. Auto converge will only be used if this flag is set to True and post copy is not permitted or post copy is unavailable due to the version of libvirt and QEMU in use. 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

libvirt_version

(optional) installed libvirt version. Default is automatic detected depending of the used OS installed via ::nova::compute::libvirt::version::default . Defaults to ::nova::compute::libvirt::version::default

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)
  • live_migration_timeout_action (Any) (defaults to: $::os_service_default)
  • live_migration_permit_post_copy (Any) (defaults to: $::os_service_default)
  • live_migration_permit_auto_converge (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)
  • libvirt_version (Any) (defaults to: $::nova::compute::libvirt::version::default) 


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# File 'manifests/migration/libvirt.pp', line 121

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,
  $live_migration_timeout_action       = $::os_service_default,
  $live_migration_permit_post_copy     = $::os_service_default,
  $live_migration_permit_auto_converge = $::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,
  $libvirt_version                     = $::nova::compute::libvirt::version::default,
) inherits nova::compute::libvirt::version {

  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_timeout_action':       value => $live_migration_timeout_action;
      'libvirt/live_migration_inbound_addr':         value => $live_migration_inbound_addr;
      'libvirt/live_migration_permit_post_copy':     value => $live_migration_permit_post_copy;
      'libvirt/live_migration_permit_auto_converge': value => $live_migration_permit_auto_converge;
    }
  }

  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}\"";
      }
    }

    if $transport_real == 'tls' or $transport_real == 'tcp' {
      if versioncmp($libvirt_version, '5.6') >= 0 {
        # Since libvirt >= 5.6 and libvirtd is managed by systemd,
        # system socket should be activated by systemd, not by --listen option
        $manage_services = pick($::nova::compute::libvirt::manage_libvirt_services, true)

        if $manage_services {
          # libvirtd.service should be stopped before socket service is started.
          # Otherwise, socket service fails to start.
          exec { 'stop libvirtd.service':
            path    => ['/sbin', '/usr/sbin', '/bin', '/usr/bin'],
            command => 'systemctl -q stop libvirtd.service',
            unless  => "systemctl -q is-active libvirtd-${transport_real}.socket",
            require => Anchor['nova::install::end']
          }

          service { "libvirtd-${transport_real}":
            ensure  => 'running',
            name    => "libvirtd-${transport_real}.socket",
            enable  => true,
            require => Anchor['nova::config::end']
          }

          Exec['stop libvirtd.service'] -> Service["libvirtd-${transport_real}"] -> Service<| title == 'libvirt' |>
        }

        # --listen option should be disabled in newer libvirt
        $libvirtd_service_listen = false

      } else {
        # For older libvirt --listen option should be used.
        $libvirtd_service_listen = true
      }

      case $::osfamily {
        'RedHat': {
          if $libvirtd_service_listen {
            $libvirtd_args = '"--listen"'
          } else {
            $libvirtd_args = ''
          }

          file_line { '/etc/sysconfig/libvirtd libvirtd args':
            path  => '/etc/sysconfig/libvirtd',
            line  => "LIBVIRTD_ARGS=${libvirtd_args}",
            match => '^LIBVIRTD_ARGS=',
            tag   => 'libvirt-file_line',
          }
        }
        'Debian': {
          if $libvirtd_service_listen {
            $libvirtd_opts = '"-l"'
          } else {
            $libvirtd_opts = ''
          }

          file_line { "/etc/default/${::nova::compute::libvirt::libvirt_service_name} libvirtd opts":
            path  => "/etc/default/${::nova::compute::libvirt::libvirt_service_name}",
            line  => "libvirtd_opts=${libvirtd_opts}",
            match => 'libvirtd_opts=',
            tag   => 'libvirt-file_line',
          }
        }
        default: {
          warning("Unsupported osfamily: ${::osfamily}, make sure you are configuring this yourself")
        }
      }
    }
  }
}