Refactor nova migration config into client & target profiles

The nova migration config has always been applied by the base::nova profile.
It assumed that libvirtd/nova-compute and are all running on the
same host.
Where this config didn't apply (e.g a nova api host) it was disabled by a flag.

This approach is not compatible with containers. Hieradata for all containers
are combined so per-host flags no longer work, and we can no longer assume
libvirtd and nova-compute run in the same context.

This change refactors the profiles out of the base nova profile and into
a client profile and a target profile that can be included where appropriate.

Change-Id: I063a84a8e6da64ae3b09125cfa42e48df69adc12
Implements: blueprint tripleo-cold-migration

2 files changed, 220 insertions, 0 deletions

diff --git a/manifests/profile/base/nova/migration/client.pp b/manifests/profile/base/nova/migration/client.pp
new file mode 100644
index 0000000..12b83dc
--- /dev/null
+++ b/manifests/profile/base/nova/migration/client.pp
@@ -0,0 +1,100 @@
+# Copyright 2016 Red Hat, Inc.
+#
+# 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.
+#
+# == Class: tripleo::profile::base::nova::migration
+#
+# Nova migration client profile for tripleo
+#
+# === Parameters
+#
+# [*libvirt_enabled*]
+#   (Optional) Whether or not Libvirt is enabled.
+#   Defaults to false
+#
+# [*nova_compute_enabled*]
+#   (Optional) Whether or not nova-compute is enabled.
+#   Defaults to false
+#
+# [*step*]
+#   (Optional) The current step of the deployment
+#   Defaults to hiera('step')
+#
+# [*ssh_private_key*]
+#   (Optional) SSH private_key for migration SSH tunnel.
+#   Defaults to ''
+#
+# [*ssh_port*]
+#   (Optional) Port that SSH target services is listening on.
+#   Defaults to 22
+#
+# [*libvirt_tls*]
+#   (Optional) Whether or not libvird TLS service is enabled.
+#   Defaults to false
+
+class tripleo::profile::base::nova::migration::client (
+  $libvirt_enabled          = false,
+  $nova_compute_enabled     = false,
+  $step                     = Integer(hiera('step')),
+  $ssh_private_key          = '',
+  $ssh_port                 = 22,
+  $libvirt_tls              = false,
+) {
+
+  include ::tripleo::profile::base::nova::migration
+
+  if $step >= 4 {
+
+    # Libvirt setup (live-migration)
+    if $libvirt_tls {
+      class { '::nova::migration::libvirt':
+        transport         => 'tls',
+        configure_libvirt => $libvirt_enabled,
+        configure_nova    => $nova_compute_enabled,
+      }
+    } else {
+      # Reuse the cold-migration SSH tunnel when TLS is not enabled
+      class { '::nova::migration::libvirt':
+        transport          => 'ssh',
+        configure_libvirt  => $libvirt_enabled,
+        configure_nova     => $nova_compute_enabled,
+        client_user        => 'nova_migration',
+        client_extraparams => {'keyfile' => '/etc/nova/migration/identity'},
+        client_port        => $ssh_port
+      }
+    }
+
+    if !empty($ssh_private_key) {
+      # Nova SSH tunnel setup (cold-migration)
+      $migration_identity = $ssh_private_key
+    }
+    else {
+      $migration_identity = '# Migration over SSH disabled by TripleO'
+    }
+
+    file { '/etc/nova/migration/identity':
+      content => $migration_identity,
+      mode    => '0600',
+      owner   => 'nova',
+      group   => 'nova',
+      require => Package['openstack-nova-migration']
+    }
+
+    file_line { 'nova_ssh_port':
+      ensure => present,
+      path   => '/var/lib/nova/.ssh/config',
+      after  => '^Host \*$',
+      line   => "    Port ${ssh_port}",
+    }
+  }
+}
diff --git a/manifests/profile/base/nova/migration/target.pp b/manifests/profile/base/nova/migration/target.pp
new file mode 100644
index 0000000..7c21028
--- /dev/null
+++ b/manifests/profile/base/nova/migration/target.pp
@@ -0,0 +1,120 @@
+# Copyright 2016 Red Hat, Inc.
+#
+# 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.
+#
+# == Class: tripleo::profile::base::nova::migration::target
+#
+# Nova migration target profile for tripleo
+#
+# === Parameters
+#
+# [*step*]
+#   (Optional) The current step of the deployment
+#   Defaults to hiera('step')
+#
+# [*ssh_authorized_keys*]
+#   (Optional) List of SSH public keys authorized for migration.
+#   If no keys are provided then migration over ssh will be disabled.
+#   Defaults to []
+#
+# [*ssh_localaddrs*]
+#   (Optional) Restrict ssh migration to clients connecting via this list of
+#   IPs.
+#   Defaults to [] (no restriction)
+#
+# [*services_enabled*]
+#   (Optional) List of services enabled on the current role.
+#   If the nova_migration_target service is not enabled then migration over
+#   ssh will be disabled.
+#   Defaults to hiera('service_names', [])
+
+class tripleo::profile::base::nova::migration::target (
+  $step                = Integer(hiera('step')),
+  $ssh_authorized_keys = [],
+  $ssh_localaddrs      = [],
+  $services_enabled    = hiera('service_names', []),
+) {
+
+  include ::tripleo::profile::base::nova::migration
+
+  validate_array($ssh_localaddrs)
+  $ssh_localaddrs.each |$x| { validate_ip_address($x) }
+  $ssh_localaddrs_real = unique($ssh_localaddrs)
+  validate_array($ssh_authorized_keys)
+  $ssh_authorized_keys_real = join($ssh_authorized_keys, '\n')
+
+  if $step >= 4 {
+    if !empty($ssh_authorized_keys_real) {
+      if ('nova_migration_target' in $services_enabled) {
+        if !empty($ssh_localaddrs_real) {
+          $allow_type = sprintf('LocalAddress %s User', join($ssh_localaddrs_real,','))
+          $deny_type = 'LocalAddress'
+          $deny_name = sprintf('!%s', join($ssh_localaddrs_real,',!'))
+
+          ssh::server::match_block { 'nova_migration deny':
+            name    => $deny_name,
+            type    => $deny_type,
+            order   => 2,
+            options => {
+              'DenyUsers' => 'nova_migration'
+            },
+            notify  => Service['sshd']
+          }
+        }
+        else {
+          $allow_type = 'User'
+        }
+        $allow_name = 'nova_migration'
+
+        ssh::server::match_block { 'nova_migration allow':
+          name    => $allow_name,
+          type    => $allow_type,
+          order   => 1,
+          options => {
+            'ForceCommand'           => '/bin/nova-migration-wrapper',
+            'PasswordAuthentication' => 'no',
+            'AllowTcpForwarding'     => 'no',
+            'X11Forwarding'          => 'no',
+            'AuthorizedKeysFile'     => '/etc/nova/migration/authorized_keys'
+          },
+          notify  => Service['sshd']
+        }
+        $migration_authorized_keys = $ssh_authorized_keys_real
+        $migration_user_shell = '/bin/bash'
+      }
+      else {
+        # Remove the keys and prevent login when migration over SSH is not enabled
+        $migration_authorized_keys = '# Migration over SSH disabled by TripleO'
+        $migration_user_shell = '/sbin/nologin'
+      }
+    }
+    else {
+      # Remove the keys and prevent login when migration over SSH is not enabled
+      $migration_authorized_keys = '# Migration over SSH disabled by TripleO'
+      $migration_user_shell = '/sbin/nologin'
+    }
+
+    file { '/etc/nova/migration/authorized_keys':
+      content => $migration_authorized_keys,
+      mode    => '0640',
+      owner   => 'root',
+      group   => 'nova_migration',
+      require => Package['openstack-nova-migration']
+    }
+
+    user {'nova_migration':
+      shell   => $migration_user_shell,
+      require => Package['openstack-nova-migration']
+    }
+  }
+}