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diff --git a/apex/tests/config/98faaca.diff b/apex/tests/config/98faaca.diff
new file mode 100644
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+++ b/apex/tests/config/98faaca.diff
@@ -0,0 +1,331 @@
+From 98faacad44e39a456d9fe1a1d21f5a65e8de4fc1 Mon Sep 17 00:00:00 2001
+From: Janki Chhatbar <jchhatba@redhat.com>
+Date: Tue, 23 Jan 2018 22:43:49 +0530
+Subject: [PATCH] Minor update steps for ODL
+
+Updating OpenStack (within release) means updating ODL from v1 to v1.1.
+This is done by "openstack overcloud update" which collects
+update_tasks. ODL needs 2 different steps to achieve this
+minor update. These are called Level1 and Level2. L1 is
+simple - stop ODL, update, start. This is taken care by paunch
+and no separate implementation is needed. L2 has extra steps
+which are implemented in update_tasks and post_update_tasks.
+
+Updating ODL within the same major release (1->1.1) consists of either
+L1 or L2 steps. These steps are decided from ODLUpdateLevel parameter
+specified in environments/services-docker/update-odl.yaml.
+
+Upgrading ODL to the next major release (1.1->2) requires
+only the L2 steps. These are implemented as upgrade_tasks and
+post_upgrade_tasks in https://review.openstack.org/489201.
+
+Steps involved in level 2 update are
+ 1. Block OVS instances to connect to ODL
+ 2. Set ODL upgrade flag to True
+ 3. Start ODL
+ 4. Start Neutron re-sync and wait for it to finish
+ 5. Delete OVS groups and ports
+ 6. Stop OVS
+ 7. Unblock OVS ports
+ 8. Start OVS
+ 9. Unset ODL upgrade flag
+
+These steps are exactly same as upgrade_tasks.
+The logic implemented is:
+follow upgrade_tasks; when update_level == 2
+
+Change-Id: Ie532800663dd24313a7350b5583a5080ddb796e7
+---
+
+diff --git a/common/deploy-steps.j2 b/common/deploy-steps.j2
+index 595e16c..c4fb05f 100644
+--- a/common/deploy-steps.j2
++++ b/common/deploy-steps.j2
+@@ -23,6 +23,7 @@
+ {% set post_upgrade_steps_max = 4 -%}
+ {% set fast_forward_upgrade_steps_max = 9 -%}
+ {% set fast_forward_upgrade_prep_steps_max = 3 -%}
++{% set post_update_steps_max = 4 -%}
+
+ heat_template_version: queens
+
+@@ -590,3 +591,15 @@
+ - include_tasks: {{role.name}}/fast_forward_upgrade_tasks.yaml
+ when: role_name == '{{role.name}}' and ansible_hostname == {{role.name}}[0]
+ {%- endfor %}
++ post_update_steps_tasks: |
++{%- for role in roles %}
++ - include: {{role.name}}/post_update_tasks.yaml
++ when: role_name == '{{role.name}}'
++{%- endfor %}
++ post_update_steps_playbook: |
++ - hosts: overcloud
++ tasks:
++ - include: post_update_steps_tasks.yaml
++ with_sequence: start=0 end={{post_update_steps_max-1}}
++ loop_control:
++ loop_var: step
+diff --git a/common/services.yaml b/common/services.yaml
+index 2a62c1b..c197b05 100644
+--- a/common/services.yaml
++++ b/common/services.yaml
+@@ -283,6 +283,16 @@
+ expression: coalesce($.data, []).where($ != null).select($.get('update_tasks')).where($ != null).flatten().distinct()
+ data: {get_attr: [ServiceChain, role_data]}
+
++ PostUpdateTasks:
++ type: OS::Heat::Value
++ properties:
++ type: comma_delimited_list
++ value:
++ yaql:
++ # Note we use distinct() here to filter any identical tasks, e.g yum update for all services
++ expression: coalesce($.data, []).where($ != null).select($.get('post_update_tasks')).where($ != null).flatten().distinct()
++ data: {get_attr: [ServiceChain, role_data]}
++
+ UpgradeBatchTasks:
+ type: OS::Heat::Value
+ properties:
+@@ -349,6 +359,7 @@
+ upgrade_tasks: {get_attr: [UpgradeTasks, value]}
+ post_upgrade_tasks: {get_attr: [PostUpgradeTasks, value]}
+ update_tasks: {get_attr: [UpdateTasks, value]}
++ post_update_tasks: {get_attr: [PostUpdateTasks, value]}
+ upgrade_batch_tasks: {get_attr: [UpgradeBatchTasks, value]}
+ service_metadata_settings: {get_attr: [ServiceServerMetadataHook, metadata]}
+
+diff --git a/docker/services/opendaylight-api.yaml b/docker/services/opendaylight-api.yaml
+index 6175db9..3cafe53 100644
+--- a/docker/services/opendaylight-api.yaml
++++ b/docker/services/opendaylight-api.yaml
+@@ -44,6 +44,14 @@
+ type: string
+ description: Specifies the default CA cert to use if TLS is used for
+ services in the internal network.
++ ODLUpdateLevel:
++ default: 1
++ description: Specify the level of update
++ type: number
++ constraints:
++ - allowed_values:
++ - 1
++ - 2
+
+ conditions:
+
+@@ -167,23 +175,25 @@
+ - opendaylight_enabled.rc == 0
+ service: name=opendaylight state=stopped enabled=no
+ # Containarised deployment upgrade steps
+- - name: remove journal and snapshots
+- when: step|int == 0
+- file:
+- path: /var/lib/opendaylight/{{item}}
+- state: absent
+- with_items:
+- - snapshots
+- - journal
+- - name: Set ODL upgrade flag to True
+- copy:
+- dest: /var/lib/opendaylight/etc/opendaylight/datastore/initial/config/genius-mdsalutil-config.xml
+- content: |
+- <config xmlns="urn:opendaylight:params:xml:ns:yang:mdsalutil">
+- <upgradeInProgress>true</upgradeInProgress>
+- </config>
+- when: step|int == 1
+- post_upgrade_tasks:
++ - name: ODL container L2 update and upgrade tasks
++ block: &odl_container_upgrade_tasks
++ - name: remove journal and snapshots
++ when: step|int == 0
++ file:
++ path: /var/lib/opendaylight/{{item}}
++ state: absent
++ with_items:
++ - snapshots
++ - journal
++ - name: Set ODL upgrade flag to True
++ copy:
++ dest: /var/lib/opendaylight/etc/opendaylight/datastore/initial/config/genius-mdsalutil-config.xml
++ content: |
++ <config xmlns="urn:opendaylight:params:xml:ns:yang:mdsalutil">
++ <upgradeInProgress>true</upgradeInProgress>
++ </config>
++ when: step|int == 1
++ post_upgrade_tasks: &odl_container_post_upgrade_tasks
+ - name: Unset upgrade flag in ODL
+ shell:
+ str_replace:
+@@ -192,7 +202,20 @@
+ -H "Content-Type: application/json" \
+ $ODL_URI/restconf/config/genius-mdsalutil:config'
+ params:
+- $ODL_USERNAME: {get_param: [OpenDaylightBase, OpenDaylightUsername]}
+- $ODL_PASSWORD: {get_param: [OpenDaylightBase, OpenDaylightPassword]}
++ $ODL_USERNAME: {get_attr: [OpenDaylightBase, role_data, config_settings, 'opendaylight::username']}
++ $ODL_PASSWORD: {get_attr: [OpenDaylightBase, role_data, config_settings, 'opendaylight::password']}
+ $ODL_URI: {get_param: [EndpointMap, OpenDaylightInternal, uri]}
+ when: step|int == 0
++ update_tasks:
++ - name: Get ODL update level
++ block: &get_odl_update_level
++ - name: store update level to update_level variable
++ set_fact:
++ odl_update_level: {get_param: ODLUpdateLevel}
++ - name: Run L2 update tasks that are similar to upgrade_tasks when update level is 2
++ block: *odl_container_upgrade_tasks
++ when: odl_update_level == 2
++ post_update_tasks:
++ - block: *get_odl_update_level
++ - block: *odl_container_post_upgrade_tasks
++ when: odl_update_level == 2
+\ No newline at end of file
+diff --git a/environments/services-docker/update-odl.yaml b/environments/services-docker/update-odl.yaml
+new file mode 100644
+index 0000000..87d74ef
+--- /dev/null
++++ b/environments/services-docker/update-odl.yaml
+@@ -0,0 +1,11 @@
++# This file describes parameters needed for ODL update.
++# This file is to be used along with other env files during
++# level 2 minor update.
++# Level 2 update involves yang changes in ODL within same ODL release and
++# hence needs DB wipe and resync.
++# Level 1 is simple update - stop ODL, pull new image, start ODL
++# This file is not be used during level1 update or major upgrade.
++# In case doubt, please reach out to ODL developers on #tripleo IRC channel
++
++parameter_defaults:
++ ODLUpdateLevel: 2
+\ No newline at end of file
+diff --git a/puppet/services/opendaylight-ovs.yaml b/puppet/services/opendaylight-ovs.yaml
+index 3390645..958e1bb 100644
+--- a/puppet/services/opendaylight-ovs.yaml
++++ b/puppet/services/opendaylight-ovs.yaml
+@@ -104,6 +104,14 @@
+ type: string
+ description: Specifies the default CA cert to use if TLS is used for
+ services in the internal network.
++ ODLUpdateLevel:
++ default: 1
++ description: Specify the level of update
++ type: number
++ constraints:
++ - allowed_values:
++ - 1
++ - 2
+
+ parameter_groups:
+ - label: deprecated
+@@ -230,14 +238,16 @@
+ - openvswitch_enabled.rc == 0
+ service: name=openvswitch state=stopped
+ # Container upgrade steps.
+- - name: Block connections to ODL. #This rule will be inserted at the top.
+- iptables: chain=OUTPUT action=insert protocol=tcp destination_port={{ item }} jump=DROP
+- when: step|int == 0
+- with_items:
+- - 6640
+- - 6653
+- - 6633
+- post_upgrade_tasks:
++ - name: ODL container L2 update and upgrade tasks
++ block: &odl_container_upgrade_tasks
++ - name: Block connections to ODL. #This rule will be inserted at the top.
++ iptables: chain=OUTPUT action=insert protocol=tcp destination_port={{ item }} jump=DROP
++ when: step|int == 0
++ with_items:
++ - 6640
++ - 6653
++ - 6633
++ post_upgrade_tasks: &odl_container_post_upgrade_tasks
+ - name: Check service openvswitch is running
+ command: systemctl is-active --quiet openvswitch
+ tags: common
+@@ -260,6 +270,20 @@
+ - name: start openvswitch service
+ when: step|int == 3
+ service : name=openvswitch state=started
++ update_tasks:
++ - name: Get ODL update level
++ block: &get_odl_update_level
++ - name: store update level to update_level variable
++ set_fact:
++ odl_update_level: {get_param: ODLUpdateLevel}
++ - name: Run L2 update tasks that are similar to upgrade_tasks when update level is 2
++ block: *odl_container_upgrade_tasks
++ when: odl_update_level == 2
++ post_update_tasks:
++ - block: *get_odl_update_level
++ - block: *odl_container_post_upgrade_tasks
++ when: odl_update_level == 2
++
+ metadata_settings:
+ if:
+ - internal_tls_enabled
+@@ -267,4 +291,4 @@
+ - service: ovs
+ network: {get_param: [ServiceNetMap, OpendaylightApiNetwork]}
+ type: node
+- - null
++ - null
+\ No newline at end of file
+diff --git a/releasenotes/notes/odl_upgrade-f5540d242b9a6b52.yaml b/releasenotes/notes/odl_upgrade-f5540d242b9a6b52.yaml
+index 45703d0..e2943de 100644
+--- a/releasenotes/notes/odl_upgrade-f5540d242b9a6b52.yaml
++++ b/releasenotes/notes/odl_upgrade-f5540d242b9a6b52.yaml
+@@ -1,6 +1,6 @@
+ ---
+
+-features:
++upgrade:
+ - Add ODL upgradability
+ Steps of upgrade are as follows
+ 1. Block OVS instances to connect to ODL done in upgrade_tasks
+diff --git a/releasenotes/notes/update_odl-cb997ce5c136ebb7.yaml b/releasenotes/notes/update_odl-cb997ce5c136ebb7.yaml
+new file mode 100644
+index 0000000..1bcf8ed
+--- /dev/null
++++ b/releasenotes/notes/update_odl-cb997ce5c136ebb7.yaml
+@@ -0,0 +1,19 @@
++---
++features:
++ - Minor update ODL steps are added. ODL minor update (within same ODL
++ release) can have 2 different workflow. These are called level 1 and
++ level2. Level 1 is simple - stop, update and start ODL. Level 2 is
++ complex and involved yang model changes. This requires wiping of
++ DB and resync to repopulate the data.
++ Steps involved in level 2 update are
++ 1. Block OVS instances to connect to ODL
++ 2. Set ODL upgrade flag to True
++ 3. Start ODL
++ 4. Start Neutron re-sync and wait for it to finish
++ 5. Delete OVS groups and ports
++ 6. Stop OVS
++ 7. Unblock OVS ports
++ 8. Start OVS
++ 9. Unset ODL upgrade flag
++ To achieve L2 update, use "-e environments/services-docker/
++ update-odl.yaml" along with other env files to the update command.
+\ No newline at end of file
+diff --git a/tools/yaml-validate.py b/tools/yaml-validate.py
+index 59473f5..9ab6a87 100755
+--- a/tools/yaml-validate.py
++++ b/tools/yaml-validate.py
+@@ -46,11 +46,11 @@
+ OPTIONAL_DOCKER_SECTIONS = ['docker_puppet_tasks', 'upgrade_tasks',
+ 'fast_forward_upgrade_tasks',
+ 'post_upgrade_tasks', 'update_tasks',
+- 'service_config_settings', 'host_prep_tasks',
+- 'metadata_settings', 'kolla_config',
+- 'global_config_settings', 'logging_source',
+- 'logging_groups', 'external_deploy_tasks',
+- 'external_post_deploy_tasks',
++ 'post_update_tasks', 'service_config_settings',
++ 'host_prep_tasks', 'metadata_settings',
++ 'kolla_config', 'global_config_settings',
++ 'logging_source', 'logging_groups',
++ 'external_deploy_tasks', 'external_post_deploy_tasks',
+ 'docker_config_scripts', 'step_config']
+ REQUIRED_DOCKER_PUPPET_CONFIG_SECTIONS = ['config_volume', 'step_config',
+ 'config_image']