Usage of kolla_container_engine variable instead of docker

First part of patchset:
 https://review.opendev.org/c/openstack/kolla-ansible/+/799229/
in which was suggested to split patch into smaller ones.

This implements kolla_container_engine variable
in command calls of docker,so later on it can be
also used for podman without further change.

Signed-off-by: Ivan Halomi <i.halomi@partner.samsung.com>
Change-Id: Ic30b67daa2e215524096ad1f4385c569e3d41b95

ansible/group_vars/all.yml

@@ -86,6 +86,10 @@ database_port: "3306"
 database_connection_recycle_time: 10
 database_max_pool_size: 1
 
+####################
+# Container engine options
+####################
+kolla_container_engine: "docker"
 
 ####################
 # Docker options

ansible/roles/bifrost/tasks/bootstrap.yml

@@ -5,7 +5,7 @@
     is_debian: "{{ kolla_base_distro in ['debian', 'ubuntu'] }}"
   become: true
   command: >
-     docker exec bifrost_deploy
+     {{ kolla_container_engine }} exec bifrost_deploy
      bash -c 'mkdir -p /var/log/kolla/ironic &&
      chown ironic:ironic /var/log/kolla/ironic &&
      mkdir -p /var/log/kolla/ironic-inspector &&
@@ -16,7 +16,7 @@
 - name: Bootstrap bifrost (this may take several minutes)
   become: true
   command: >
-     docker exec bifrost_deploy
+     {{ kolla_container_engine }} exec bifrost_deploy
      bash -c
      'ansible-playbook {{ bifrost_deploy_verbosity }}
      -i /bifrost/playbooks/inventory/target
@@ -26,7 +26,7 @@
 - name: Installing ssh keys
   become: true
   command: >
-     docker exec bifrost_deploy
+     {{ kolla_container_engine }} exec bifrost_deploy
      bash -c 'mkdir /root/.ssh ; mkdir /home/ironic/.ssh;
      cp -f /etc/bifrost/id_rsa /root/.ssh/id_rsa &&
      cp -f /etc/bifrost/id_rsa.pub /root/.ssh/id_rsa.pub &&

ansible/roles/bifrost/tasks/deploy-servers.yml

@@ -2,7 +2,7 @@
 - name: Enrolling physical servers with ironic
   become: true
   command: >
-     docker exec bifrost_deploy
+     {{ kolla_container_engine }} exec bifrost_deploy
      bash -c 'export OS_CLOUD=bifrost &&
      export BIFROST_INVENTORY_SOURCE=/etc/bifrost/servers.yml &&
      ansible-playbook {{ bifrost_deploy_verbosity }}}
@@ -12,7 +12,7 @@
 - name: Deploy physical servers with ironic
   become: true
   command: >
-     docker exec bifrost_deploy
+     {{ kolla_container_engine }} exec bifrost_deploy
      bash -c 'export OS_CLOUD=bifrost &&
      export BIFROST_INVENTORY_SOURCE=/etc/bifrost/servers.yml &&
      ansible-playbook {{ bifrost_deploy_verbosity }}

ansible/roles/bifrost/tasks/reconfigure.yml

@@ -14,7 +14,7 @@
 
 - name: Check the configs
   become: true
-  command: docker exec {{ item.name }} /usr/local/bin/kolla_set_configs --check
+  command: "{{ kolla_container_engine }} exec {{ item.name }} /usr/local/bin/kolla_set_configs --check"
   changed_when: false
   failed_when: false
   register: check_results

ansible/roles/bifrost/tasks/stop.yml

@@ -12,7 +12,7 @@
         # order.
         - name: Stop services gracefully
           become: true
-          command: docker exec bifrost_deploy systemctl stop {{ item }}.service
+          command: "{{ kolla_container_engine }} exec bifrost_deploy systemctl stop {{ item }}.service"
           with_items:
             - ironic
             - ironic-inspector

ansible/roles/common/handlers/main.yml

@@ -36,7 +36,7 @@
 
 - name: Initializing toolbox container using normal user
   become: true
-  command: docker exec -t "{{ common_services['kolla-toolbox']['container_name'] }}" ansible --version
+  command: "{{ kolla_container_engine }} exec -t {{ common_services['kolla-toolbox']['container_name'] }} ansible --version"
   changed_when: false
 
 - name: Restart cron container

ansible/roles/designate/tasks/update_pools.yml

@@ -1,6 +1,6 @@
 ---
 - name: Update DNS pools
   become: true
-  command: docker exec -t designate_worker designate-manage pool update --file /etc/designate/pools.yaml
+  command: "{{ kolla_container_engine }} exec -t designate_worker designate-manage pool update --file /etc/designate/pools.yaml"
   run_once: True
   delegate_to: "{{ groups['designate-worker'][0] }}"

ansible/roles/hacluster/tasks/bootstrap_service.yml

@@ -2,7 +2,7 @@
 - name: Ensure stonith is disabled
   vars:
     service: "{{ hacluster_services['hacluster-pacemaker'] }}"
-  command: docker exec {{ service.container_name }} crm_attribute --type crm_config --name stonith-enabled --update false
+  command: "{{ kolla_container_engine }} exec {{ service.container_name }} crm_attribute --type crm_config --name stonith-enabled --update false"
   run_once: true
   become: true
   delegate_to: "{{ groups[service.group][0] }}"
@@ -12,7 +12,7 @@
     pacemaker_service: "{{ hacluster_services['hacluster-pacemaker'] }}"
     pacemaker_remote_service: "{{ hacluster_services['hacluster-pacemaker-remote'] }}"
   shell: >
-    docker exec {{ pacemaker_service.container_name }}
+    {{ kolla_container_engine }} exec {{ pacemaker_service.container_name }}
     cibadmin --modify --scope resources -X '
       <resources>
         <primitive id="{{ ansible_facts.hostname }}" class="ocf" provider="pacemaker" type="remote">

ansible/roles/ironic/tasks/upgrade.yml

@@ -2,7 +2,7 @@
 - name: Wait for Ironic nodes not to wait
   become: true
   command: >
-    docker exec kolla_toolbox openstack
+    {{ kolla_container_engine }} exec kolla_toolbox openstack
     --os-interface {{ openstack_interface }}
     --os-auth-url {{ openstack_auth.auth_url }}
     --os-username {{ openstack_auth.username }}

ansible/roles/keystone/tasks/distribute_fernet.yml

@@ -11,7 +11,7 @@
 
 - name: Run key distribution
   become: true
-  command: docker exec -t "{{ keystone_services['keystone-fernet']['container_name'] }}" /usr/bin/fernet-push.sh
+  command: "{{ kolla_container_engine }} exec -t {{ keystone_services['keystone-fernet']['container_name'] }} /usr/bin/fernet-push.sh"
   run_once: True
   delegate_to: >-
     {% if groups['keystone_fernet_running'] is defined -%}

ansible/roles/keystone/tasks/register.yml

@@ -2,7 +2,7 @@
 - name: Creating admin project, user, role, service, and endpoint
   become: true
   command: >
-    docker exec keystone kolla_keystone_bootstrap
+    {{ kolla_container_engine }} exec keystone kolla_keystone_bootstrap
     {{ openstack_auth.username }} {{ openstack_auth.password }} {{ keystone_admin_project }}
     admin {{ keystone_internal_url }} {{ keystone_public_url }} {{ item }}
   register: keystone_bootstrap

ansible/roles/keystone/tasks/register_identity_providers.yml

@@ -1,7 +1,7 @@
 ---
 - name: List configured attribute mappings (that can be used by IdPs)
   command: >
-    docker exec -t keystone openstack
+    {{ kolla_container_engine }} exec -t keystone openstack
       --os-auth-url={{ openstack_auth.auth_url }}
       --os-password={{ openstack_auth.password }}
       --os-username={{ openstack_auth.username }}
@@ -22,7 +22,7 @@
 
 - name: Remove unmanaged attribute mappings
   command: >
-    docker exec -t keystone openstack
+    {{ kolla_container_engine }} exec -t keystone openstack
     --os-auth-url={{ openstack_auth.auth_url }}
     --os-password={{ openstack_auth.password }}
     --os-username={{ openstack_auth.username }}
@@ -57,7 +57,7 @@
 - name: Register attribute mappings in OpenStack
   become: true
   command: >
-    docker exec -t keystone openstack
+    {{ kolla_container_engine }} exec -t keystone openstack
     --os-auth-url={{ openstack_auth.auth_url }}
     --os-password={{ openstack_auth.password }}
     --os-username={{ openstack_auth.username }}
@@ -78,7 +78,7 @@
 - name: Update existing attribute mappings in OpenStack
   become: true
   command: >
-    docker exec -t keystone openstack
+    {{ kolla_container_engine }} exec -t keystone openstack
     --os-auth-url={{ openstack_auth.auth_url }}
     --os-password={{ openstack_auth.password }}
     --os-username={{ openstack_auth.username }}
@@ -99,7 +99,7 @@
 - name: List configured IdPs
   become: true
   command: >
-    docker exec -t keystone openstack
+    {{ kolla_container_engine }} exec -t keystone openstack
     --os-auth-url={{ openstack_auth.auth_url }}
     --os-password={{ openstack_auth.password }}
     --os-username={{ openstack_auth.username }}
@@ -120,7 +120,7 @@
 - name: Remove unmanaged identity providers
   become: true
   command: >
-    docker exec -t keystone openstack
+    {{ kolla_container_engine }} exec -t keystone openstack
     --os-auth-url={{ openstack_auth.auth_url }}
     --os-password={{ openstack_auth.password }}
     --os-username={{ openstack_auth.username }}
@@ -140,7 +140,7 @@
 - name: Register Identity Providers in OpenStack
   become: true
   command: >
-    docker exec -t keystone openstack
+    {{ kolla_container_engine }} exec -t keystone openstack
     --os-auth-url={{ openstack_auth.auth_url }}
     --os-password={{ openstack_auth.password }}
     --os-username={{ openstack_auth.username }}
@@ -163,7 +163,7 @@
 - name: Update Identity Providers in OpenStack according to Kolla-Ansible configurations
   become: true
   command: >
-    docker exec -t keystone openstack
+    {{ kolla_container_engine }} exec -t keystone openstack
     --os-auth-url={{ openstack_auth.auth_url }}
     --os-password={{ openstack_auth.password }}
     --os-username={{ openstack_auth.username }}
@@ -185,7 +185,7 @@
 - name: Configure attribute mappings for each Identity Provider. (We expect the mappings to be configured by the operator)
   become: true
   command: >
-    docker exec -t keystone openstack
+    {{ kolla_container_engine }} exec -t keystone openstack
     --os-auth-url={{ openstack_auth.auth_url }}
     --os-password={{ openstack_auth.password }}
     --os-username={{ openstack_auth.username }}
@@ -207,7 +207,7 @@
 - name: Update attribute mappings for each Identity Provider. (We expect the mappings to be configured by the operator).
   become: true
   command: >
-    docker exec -t keystone openstack
+    {{ kolla_container_engine }} exec -t keystone openstack
     --os-auth-url={{ openstack_auth.auth_url }}
     --os-password={{ openstack_auth.password }}
     --os-username={{ openstack_auth.username }}

ansible/roles/loadbalancer/tasks/precheck.yml

@@ -194,7 +194,7 @@
 
 - name: Getting haproxy stat
   become: true
-  shell: echo "show stat" | docker exec -i haproxy socat unix-connect:/var/lib/kolla/haproxy/haproxy.sock stdio  # noqa risky-shell-pipe
+  shell: echo "show stat" | {{ kolla_container_engine }} exec -i haproxy socat unix-connect:/var/lib/kolla/haproxy/haproxy.sock stdio  # noqa risky-shell-pipe
   register: haproxy_stat_shell
   changed_when: false
   when: container_facts['haproxy'] is defined

ansible/roles/mariadb/handlers/main.yml

@@ -36,7 +36,7 @@
 - name: Wait for first MariaDB service to sync WSREP
   become: true
   command: >-
-    docker exec {{ mariadb_service.container_name }}
+    {{ kolla_container_engine }} exec {{ mariadb_service.container_name }}
     mysql -uroot -p{{ database_password }}
     --silent --skip-column-names
     -e 'SHOW STATUS LIKE "wsrep_local_state_comment"'

ansible/roles/mariadb/tasks/check.yml

@@ -5,7 +5,7 @@
 - name: Wait for MariaDB service to be ready through VIP
   become: true
   command: >
-    docker exec {{ mariadb_service.container_name }}
+    {{ kolla_container_engine }} exec {{ mariadb_service.container_name }}
     mysql -h {{ database_address }} -P {{ database_port }}
     -u {{ mariadb_shard_database_user }} -p{{ database_password }} -e 'show databases;'
   register: result

ansible/roles/mariadb/tasks/lookup_cluster.yml

@@ -45,7 +45,7 @@
         - name: Check MariaDB service WSREP sync status
           become: true
           command: >-
-            docker exec {{ mariadb_service.container_name }}
+            {{ kolla_container_engine }} exec {{ mariadb_service.container_name }}
             mysql -uroot -p{{ database_password }}
             --silent --skip-column-names
             -e 'SHOW STATUS LIKE "wsrep_local_state_comment"'

ansible/roles/mariadb/tasks/recover_cluster.yml

@@ -142,7 +142,7 @@
 
 - name: Set first MariaDB container as primary
   become: true
-  shell: "docker exec {{ mariadb_service.container_name }} mysql -uroot -p{{ database_password }} -e \"SET GLOBAL wsrep_provider_options='pc.bootstrap=yes';\""
+  shell: "{{ kolla_container_engine }} exec {{ mariadb_service.container_name }} mysql -uroot -p{{ database_password }} -e \"SET GLOBAL wsrep_provider_options='pc.bootstrap=yes';\""
   no_log: True
   when:
     - bootstrap_host is defined
@@ -151,7 +151,7 @@
 - name: Wait for MariaDB to become operational
   become: true
   command: >-
-    docker exec {{ mariadb_service.container_name }}
+    {{ kolla_container_engine }} exec {{ mariadb_service.container_name }}
     mysql -uroot -p{{ database_password }}
     --silent --skip-column-names
     -e 'SHOW STATUS LIKE "wsrep_evs_state"'

ansible/roles/mariadb/tasks/restart_services.yml

@@ -30,7 +30,7 @@
 - name: Wait for MariaDB service to sync WSREP
   become: true
   command: >-
-    docker exec {{ mariadb_service.container_name }}
+    {{ kolla_container_engine }} exec {{ mariadb_service.container_name }}
     mysql -uroot -p{{ database_password }}
     --silent --skip-column-names
     -e 'SHOW STATUS LIKE "wsrep_local_state_comment"'

ansible/roles/monasca/tasks/bootstrap.yml

@@ -44,7 +44,7 @@
 # [1] https://github.com/influxdata/influxdb-python#influxdb-pre-v110-users
 - name: List influxdb databases
   become: true
-  command: "docker exec influxdb influx -host {{ monasca_influxdb_address }} -port {{ monasca_influxdb_http_port }} -execute 'show databases'"
+  command: "{{ kolla_container_engine }} exec influxdb influx -host {{ monasca_influxdb_address }} -port {{ monasca_influxdb_http_port }} -execute 'show databases'"
   run_once: True
   delegate_to: "{{ groups['influxdb'][0] }}"
   register: monasca_influxdb_database
@@ -53,7 +53,7 @@
 - name: Creating monasca influxdb database
   become: true
   command: >
-    docker exec influxdb influx -host {{ monasca_influxdb_address }} -port {{ monasca_influxdb_http_port }} -execute
+    {{ kolla_container_engine }} exec influxdb influx -host {{ monasca_influxdb_address }} -port {{ monasca_influxdb_http_port }} -execute
     'CREATE DATABASE {{ monasca_influxdb_name }} WITH DURATION {{ monasca_influxdb_retention_policy.duration }}
     REPLICATION  {{ monasca_influxdb_retention_policy.replication_count }} NAME {{ monasca_influxdb_retention_policy.name }}'
   run_once: True
@@ -68,7 +68,7 @@
 - name: List monasca kafka topics
   become: true
   command: >
-    docker exec kafka /opt/kafka/bin/kafka-topics.sh
+    {{ kolla_container_engine }} exec kafka /opt/kafka/bin/kafka-topics.sh
     --zookeeper localhost
     --list
   register: kafka_topics
@@ -78,7 +78,7 @@
 - name: Create monasca kafka topics if they don't exist
   become: true
   command: >
-    docker exec kafka /opt/kafka/bin/kafka-topics.sh
+    {{ kolla_container_engine }} exec kafka /opt/kafka/bin/kafka-topics.sh
     --create
     --topic {{ item.name }}
     --partitions {{ item.partitions }}
@@ -94,7 +94,7 @@
 - name: Remove monasca kafka topics for disabled services
   become: true
   command: >
-    docker exec kafka /opt/kafka/bin/kafka-topics.sh
+    {{ kolla_container_engine }} exec kafka /opt/kafka/bin/kafka-topics.sh
     --delete
     --topic "{{ item.name }}"
     --zookeeper localhost

ansible/roles/murano/tasks/import_library_packages.yml

@@ -15,7 +15,7 @@
 - name: Checking if Murano core and applications library packages exist
   become: true
   command: >
-    docker exec murano_api murano
+    {{ kolla_container_engine }} exec murano_api murano
     --os-username {{ openstack_auth.username }}
     --os-password {{ openstack_auth.password }}
     --os-system-scope {{ openstack_auth.system_scope }}
@@ -31,7 +31,7 @@
 - name: Importing Murano core library package
   become: true
   command: >
-    docker exec murano_api murano
+    {{ kolla_container_engine }} exec murano_api murano
     --os-username {{ openstack_auth.username }}
     --os-password {{ openstack_auth.password }}
     --os-system-scope {{ openstack_auth.system_scope }}
@@ -47,7 +47,7 @@
 - name: Importing Murano applications library package
   become: true
   command: >
-    docker exec murano_api murano
+    {{ kolla_container_engine }} exec murano_api murano
     --os-username {{ openstack_auth.username }}
     --os-password {{ openstack_auth.password }}
     --os-system-scope {{ openstack_auth.system_scope }}

ansible/roles/neutron/tasks/rolling_upgrade.yml

@@ -37,7 +37,7 @@
 
 - name: Checking neutron pending contract scripts
   become: true
-  command: "docker exec -t neutron_server neutron-db-manage --subproject {{ item }} has_offline_migrations"
+  command: "{{ kolla_container_engine }} exec -t neutron_server neutron-db-manage --subproject {{ item }} has_offline_migrations"
   register: neutron_check_contract_db_stdout
   ignore_errors: yes
   with_items: "{{ neutron_rolling_upgrade_services }}"

ansible/roles/nova-cell/handlers/main.yml

@@ -122,7 +122,7 @@
     cmd: >
       set -o pipefail &&
       echo {{ libvirt_sasl_password }} |
-      docker exec -i nova_libvirt
+      {{ kolla_container_engine }} exec -i nova_libvirt
       saslpasswd2 -c -p -a libvirt {{ libvirt_sasl_authname }}
     executable: /bin/bash
   changed_when: true

ansible/roles/nova-cell/tasks/discover_computes.yml

@@ -14,7 +14,7 @@
     - name: Discover nova hosts
       become: true
       command: >
-        docker exec nova_conductor nova-manage cell_v2 discover_hosts --by-service --cell_uuid {{ nova_cell_settings.cell_uuid }}
+        {{ kolla_container_engine }} exec nova_conductor nova-manage cell_v2 discover_hosts --by-service --cell_uuid {{ nova_cell_settings.cell_uuid }}
       changed_when: False
 
   # Delegate to a cell conductor.

ansible/roles/nova-cell/tasks/wait_discover_computes.yml

@@ -8,7 +8,7 @@
     - name: Waiting for nova-compute services to register themselves
       become: true
       command: >
-        docker exec kolla_toolbox openstack
+        {{ kolla_container_engine }} exec kolla_toolbox openstack
         --os-interface {{ openstack_interface }}
         --os-auth-url {{ openstack_auth.auth_url }}
         --os-username {{ openstack_auth.username }}

ansible/roles/nova/tasks/refresh_scheduler_cell_cache.yml

@@ -7,6 +7,6 @@
   # Docker bug (https://github.com/moby/moby/issues/11065), this might cause the
   # container to be stopped if we restart Docker or reboot the server as we
   # use the 'unless-stopped' restart policy by default.
-  shell: "kill -HUP `docker inspect -f '{% raw %}{{ .State.Pid }}{% endraw %}' nova_scheduler`"
+  shell: "kill -HUP `{{ kolla_container_engine }} inspect -f '{% raw %}{{ .State.Pid }}{% endraw %}' nova_scheduler`"
   when:
     - inventory_hostname in groups['nova-scheduler']

ansible/roles/nova/tasks/upgrade.yml

@@ -1,7 +1,7 @@
 ---
 - name: Check nova upgrade status
   become: true
-  command: docker exec -t nova_api nova-status upgrade check
+  command: "{{ kolla_container_engine }} exec -t nova_api nova-status upgrade check"
   register: nova_upgrade_check_stdout
   when: inventory_hostname == groups['nova-api'][0]
   failed_when: false

ansible/roles/octavia/tasks/hm-interface.yml

@@ -23,7 +23,7 @@
   vars:
     port_id: "{{ port_info.id }}"
   command: >
-    docker exec kolla_toolbox openstack
+    {{ kolla_container_engine }} exec kolla_toolbox openstack
     --os-interface {{ openstack_interface }}
     --os-auth-url {{ octavia_user_auth.auth_url }}
     --os-identity-api-version 3
@@ -43,7 +43,7 @@
     port_id: "{{ port_info.id }}"
   become: True
   command: >
-    docker exec openvswitch_vswitchd ovs-vsctl --may-exist \
+    {{ kolla_container_engine }} exec openvswitch_vswitchd ovs-vsctl --may-exist \
     add-port br-int {{ octavia_network_interface }} \
     -- set Interface {{ octavia_network_interface }} type=internal \
     -- set Interface {{ octavia_network_interface }} external-ids:iface-status=active \

ansible/roles/openvswitch/handlers/main.yml

@@ -19,7 +19,7 @@
 
 - name: Waiting for openvswitch_db service to be ready
   become: true
-  command: docker exec openvswitch_db ovs-vsctl --no-wait show
+  command: "{{ kolla_container_engine }} exec openvswitch_db ovs-vsctl --no-wait show"
   register: check_result
   until: check_result is success
   changed_when: False

ansible/roles/openvswitch/tasks/post-config.yml

@@ -18,7 +18,7 @@
 
 - name: Ensuring OVS bridge is properly setup
   become: true
-  command: docker exec openvswitch_db /usr/local/bin/kolla_ensure_openvswitch_configured {{ item.0 }} {{ item.1 }}
+  command: "{{ kolla_container_engine }} exec openvswitch_db /usr/local/bin/kolla_ensure_openvswitch_configured {{ item.0 }} {{ item.1 }}"
   register: status
   changed_when: status.stdout.find('changed') != -1
   when:

ansible/roles/ovs-dpdk/handlers/main.yml

@@ -26,7 +26,7 @@
     service_name: "ovsdpdk-db"
     service: "{{ ovsdpdk_services[service_name] }}"
   become: true
-  command: docker exec "{{ service.container_name }}" ovs-vsctl --no-wait show
+  command: "{{ kolla_container_engine }} exec {{ service.container_name }} ovs-vsctl --no-wait show"
   register: check_result
   until: check_result is success
   changed_when: False
@@ -39,7 +39,7 @@
     service: "{{ ovsdpdk_services[service_name] }}"
   become: true
   command: >
-    docker exec {{ service.container_name }} /bin/sh -c
+    {{ kolla_container_engine }} exec {{ service.container_name }} /bin/sh -c
     'CONFIG_FILE={{ container_config_directory }}/ovs-dpdkctl.conf {{ container_config_directory }}/ovs-dpdkctl.sh init'
   register: status
   changed_when: status.stdout.find('changed') != -1
@@ -73,7 +73,7 @@
     service: "{{ ovsdpdk_services[service_name] }}"
   become: true
   command: >
-    docker exec {{ service.container_name }} /bin/sh -c
+    {{ kolla_container_engine }} exec {{ service.container_name }} /bin/sh -c
     'CONFIG_FILE={{ container_config_directory }}/ovs-dpdkctl.conf {{ container_config_directory }}/ovs-dpdkctl.sh init'
   register: status
   changed_when: status.stdout.find('changed') != -1

ansible/roles/prechecks/tasks/service_checks.yml

@@ -1,7 +1,7 @@
 ---
 - name: Checking Docker version
   become: true
-  command: docker --version
+  command: "{{ kolla_container_engine }} --version"
   register: result
   changed_when: false
   when: inventory_hostname in groups['baremetal']

ansible/roles/rabbitmq/tasks/restart_services.yml

@@ -19,4 +19,4 @@
     service_name: "rabbitmq"
     service: "{{ rabbitmq_services[service_name] }}"
   become: true
-  command: "docker exec {{ service.container_name }} rabbitmqctl wait {{ rabbitmq_pid_file }}"
+  command: "{{ kolla_container_engine }} exec {{ service.container_name }} rabbitmqctl wait {{ rabbitmq_pid_file }}"

ansible/roles/redis/tasks/check.yml

@@ -1,7 +1,7 @@
 ---
 - name: Redis ping pong check
   become: true
-  command: "docker exec redis redis-cli -h {{ api_interface_address }} -a {{ redis_master_password }} ping"
+  command: "{{ kolla_container_engine }} exec redis redis-cli -h {{ api_interface_address }} -a {{ redis_master_password }} ping"
   register: redis_check
   changed_when: "redis_check.stdout != 'PONG'"
   failed_when: "redis_check.stdout != 'PONG'"

ansible/roles/swift/tasks/reconfigure.yml

@@ -44,7 +44,7 @@
 
 - name: Check the configs
   become: true
-  command: docker exec -u root {{ item.name }} /usr/local/bin/kolla_set_configs --check
+  command: "{{ kolla_container_engine }}exec -u root {{ item.name }} /usr/local/bin/kolla_set_configs --check"
   changed_when: false
   failed_when: false
   register: check_results

ansible/roles/swift/tasks/start.yml

@@ -1,10 +1,10 @@
 ---
 - name: Looking up disks for Swift
   become: true
-  command: docker exec -t kolla_toolbox sudo -E ansible localhost
+  command: "{{ kolla_container_engine }} exec -t kolla_toolbox sudo -E ansible localhost
     -m find_disks
-    -a "name={{ swift_devices_name }}
+    -a \"name={{ swift_devices_name }}
-        match_mode={{ swift_devices_match_mode }}"
+        match_mode={{ swift_devices_match_mode }}\""
   register: swift_disk_lookup
   changed_when: swift_disk_lookup.stdout.find('localhost | SUCCESS => ') != -1 and
                     (swift_disk_lookup.stdout.split('localhost | SUCCESS => ')[1] | from_json).changed

ansible/roles/zun/handlers/main.yml

@@ -80,7 +80,7 @@
     service_name: "zun-cni-daemon"
     service: "{{ zun_services[service_name] }}"
   become: true
-  command: "docker cp {{ service.container_name }}:/opt/loopback /opt/cni/bin/"
+  command: "{{ kolla_container_engine }} cp {{ service.container_name }}:/opt/loopback /opt/cni/bin/"
   # NOTE(yoctozepto): it would be cleaner to listen only on image change
   # but there is no such mechanism (yet) and container change should be
   # good enough (better than including config change triggers)

etc/kolla/globals.yml

@@ -71,6 +71,13 @@ workaround_ansible_issue_8743: yes
 # Optionally change the path to sysctl.conf modified by Kolla Ansible plays.
 #kolla_sysctl_conf_path: /etc/sysctl.conf
 
+################
+# Container engine
+################
+
+# Valid options are [ docker ]
+# kolla_container_engine: docker
+
 ################
 # Docker options
 ################