Implement nova-lxd driver

This patch set is designed to allow deployers to select
the virt_type = 'lxc', which will deploy the nova-lxd
driver instead of the usual kvm driver.

Change-Id: I8b298080faaef9da1ab0040de437086a1a393296

defaults/main.yml

@@ -27,9 +27,16 @@ nova_git_repo: https://git.openstack.org/openstack/nova
 nova_git_install_branch: master
 nova_requirements_git_repo: https://git.openstack.org/openstack/requirements
 nova_requirements_git_install_branch: master
+
+nova_lxd_git_repo: https://git.openstack.org/openstack/nova-lxd
+nova_lxd_git_install_branch: master
+nova_lxd_requirements_git_repo: https://git.openstack.org/openstack/requirements
+nova_lxd_requirements_git_install_branch: master
+
 nova_developer_mode: false
 nova_developer_constraints:
   - "git+{{ nova_git_repo }}@{{ nova_git_install_branch }}#egg=nova"
+  - "git+{{ nova_lxd_git_repo }}@{{ nova_lxd_git_install_branch }}#egg=nova-lxd"
 
 # Name of the virtual env to deploy into
 nova_venv_tag: untagged
@@ -118,6 +125,14 @@ nova_virt_types:
     nova_firewall_driver: nova.virt.firewall.NoopFirewallDriver
     nova_scheduler_use_baremetal_filters: False
     nova_scheduler_tracks_instance_changes: True
+  lxc:
+    nova_compute_driver: lxd.LXDDriver
+    nova_scheduler_host_manager: host_manager
+    nova_reserved_host_memory_mb: 2048
+    nova_compute_manager: nova.compute.manager.ComputeManager
+    nova_firewall_driver: nova.virt.firewall.NoopFirewallDriver
+    nova_scheduler_use_baremetal_filters: False
+    nova_scheduler_tracks_instance_changes: True
   qemu:
     nova_compute_driver: libvirt.LibvirtDriver
     nova_scheduler_host_manager: host_manager
@@ -133,10 +148,18 @@ nova_virt_types:
     nova_scheduler_use_baremetal_filters: False
     nova_scheduler_tracks_instance_changes: True
 
-# Current supported choice: qemu or kvm or ironic or powervm
+
 # If this is not set, then the playbook will try to guess it.
 #nova_virt_type: kvm
 
+#if set, nova_virt_type must be one of these:
+nova_supported_virt_types:
+  - qemu
+  - kvm
+  - lxc
+  - ironic
+  - powervm
+
 ## Nova Auth
 nova_service_region: RegionOne
 nova_service_project_name: "service"
@@ -380,6 +403,10 @@ nova_pip_packages:
   - keystonemiddleware
   - nova
 
+nova_compute_lxd_pip_packages:
+  - pylxd
+  - nova-lxd
+
 nova_qemu_user: libvirt-qemu
 nova_qemu_group: kvm
 
@@ -391,3 +418,9 @@ nova_policy_overrides: {}
 
 nova_compute_powervm_pip_packages:
   - nova-powervm
+
+lxd_bind_address: 0.0.0.0
+lxd_bind_port: 8443
+lxd_storage_backend: dir
+# This needs to be set in the user_secrets.yml file.
+#lxd_trust_password:

releasenotes/notes/add-nova-lxd-f094438e4bf36d52.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - The os_nova role can now deploy the nova-lxd hypervisor.
+    This can be achieved by setting ``nova_virt_type`` to
+    ``lxc`` on a per-host basis in ``openstack_user_config.yml``
+    or on a global basis in ``user_variables.yml``.

tasks/main.yml

@@ -37,6 +37,13 @@
   tags:
     - always
 
+- fail: msg="Unsupported Virt Type Provided {{ nova_supported_virt_types }}"
+  when:
+    - nova_virt_type is defined
+    - nova_virt_type not in nova_supported_virt_types
+  tags:
+    - always
+
 - include: nova_virt_detect.yml
   when: nova_virt_type is not defined
   tags:

tasks/nova_compute.yml

@@ -19,6 +19,9 @@
 - include: nova_compute_powervm.yml
   when: nova_virt_type == 'powervm'
 
+- include: nova_compute_lxd.yml
+  when: nova_virt_type == 'lxc'
+
 - include: nova_compute_key_populate.yml
 
 - include: nova_compute_key_distribute.yml

tasks/nova_compute_lxd.yml

@@ -0,0 +1,41 @@
+---
+# Copyright 2016, Walmart Stores, 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.
+
+- include: nova_compute_lxd_install.yml
+
+- name: Add nova user to lxd group
+  user:
+    name: "{{ nova_system_user_name }}"
+    groups: "lxd"
+    append: "yes"
+  tags:
+    - nova-lxd
+
+- name: Place lxd config script
+  template:
+    src: lxd-init.sh.j2
+    dest: "{{ nova_system_home_folder }}/lxd-init.sh"
+    owner: "{{ nova_system_user_name }}"
+    group: "lxd"
+    mode: 0770
+  register: lxd_init_script
+  tags:
+    - nova-lxd
+
+- name: Configure lxd init
+  command: "{{ nova_system_home_folder }}/lxd-init.sh"
+  when: lxd_init_script | changed
+  tags:
+    - nova-lxd

tasks/nova_compute_lxd_install.yml

@@ -0,0 +1,29 @@
+---
+# Copyright 2016, Walmart Stores, 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.
+
+- name: Install pip packages (venv)
+  pip:
+    name: "{{ nova_compute_lxd_pip_packages | join(' ') }}"
+    state: latest
+    virtualenv: "{{ nova_bin | dirname }}"
+    virtualenv_site_packages: "no"
+    extra_args: "{{ pip_install_options_fact|default('') }}"
+  register: install_packages
+  until: install_packages|success
+  retries: 5
+  delay: 2
+  tags:
+    - nova-install
+    - nova-pip-packages

tasks/nova_install_apt.yml

@@ -115,3 +115,20 @@
   tags:
     - nova-apt-packages
     - nova-compute-kvm-apt-packages
+
+- name: Install apt packages (compute - LXD)
+  apt:
+    pkg: "{{ item }}"
+    state: "{{ nova_package_state }}"
+    default_release: "{{ lxd_default_release | default(omit) }}"
+  register: install_packages
+  until: install_packages|success
+  retries: 5
+  delay: 2
+  with_items: "{{ nova_compute_lxd_packages }}"
+  when:
+    - inventory_hostname in groups['nova_compute']
+    - nova_virt_type == 'lxc'
+  tags:
+    - nova-apt-packages
+    - nova-compute-lxd-apt-packages

templates/lxd-init.sh.j2

@@ -0,0 +1,12 @@
+#!/bin/bash
+# {{ ansible_managed }}
+
+# This is a script to configure lxd system settings.
+# "/usr/bin/lxd init"
+
+/usr/bin/lxd init \
+  --auto \
+  --network-address={{ lxd_bind_address }} \
+  --network-port={{ lxd_bind_port }} \
+  --storage-backend={{ lxd_storage_backend }} \
+  --trust-password={{ lxd_trust_password }}

templates/nova.conf.j2

@@ -103,7 +103,7 @@ auth_strategy = keystone
 
 ## Vif
 linuxnet_interface_driver = {{ nova_linuxnet_interface_driver }}
-{% if nova_virt_type in ['kvm', 'qemu', 'xen'] %}
+{% if nova_virt_type in ['kvm', 'lxc', 'qemu', 'xen'] %}
 libvirt_vif_type = ethernet
 {% endif %}
 vif_plugging_timeout = 10
@@ -256,7 +256,7 @@ admin_url = {{ keystone_service_adminuri }}/v2.0
 api_endpoint = {{ ironic_service_adminurl }}
 {% endif %}
 
-{% if nova_virt_type in ['kvm', 'qemu', 'xen'] %}
+{% if nova_virt_type in ['kvm', 'lxc', 'qemu', 'xen'] %}
 [libvirt]
 inject_partition = {{ nova_libvirt_inject_partition }}
 inject_password = {{ nova_libvirt_inject_password }}

vars/ubuntu-14.04.yml

@@ -52,6 +52,20 @@ nova_compute_kvm_packages:
   - dosfstools-dbg
   - multipath-tools
 
+nova_compute_lxd_packages:
+  - bridge-utils
+  - dosfstools
+  - dosfstools-dbg
+  - genisoimage
+  - kpartx
+  - lxd
+  - multipath-tools
+  - nfs-common
+  - open-iscsi
+  - python-libguestfs
+  - sysfsutils
+  - vlan
+
 # Ubuntu Cloud Archive variables
 # There are no UCA packages for Trusty beyond Mitaka, so the selected
 # release here has to remain at Mitaka.
@@ -81,3 +95,6 @@ novalink_repo:
 novalink_gpg_keys:
   - url: "ftp://public.dhe.ibm.com/systems/virtualization/Novalink/debian/novalink-gpg-pub.key"
     state: "present"
+
+#lxd-specific variables
+lxd_default_release: "trusty-backports"

vars/ubuntu-16.04.yml

@@ -52,6 +52,21 @@ nova_compute_kvm_packages:
   - dosfstools-dbg
   - multipath-tools
 
+nova_compute_lxd_packages:
+  - bridge-utils
+  - dosfstools
+  - dosfstools-dbg
+  - genisoimage
+  - kpartx
+  - lxd
+  - multipath-tools
+  - nfs-common
+  - open-iscsi
+  - python-libguestfs
+  - sysfsutils
+  - vlan
+
+
 # Ubuntu Cloud Archive variables
 uca_openstack_release: newton
 uca_repo_dist: "{{ ansible_lsb.codename }}-updates/{{ uca_openstack_release }}"