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After the integration with placement [1], we need to configure how zun-compute is going to work with nova-compute. * If zun-compute and nova-compute run on the same compute node, we need to set 'host_shared_with_nova' as true so that Zun will use the resource provider (compute node) created by nova. In this mode, containers and VMs could claim allocations against the same resource provider. * If zun-compute runs on a node without nova-compute, no extra configuration is needed. By default, each zun-compute will create a resource provider in placement to represent the compute node it manages. [1] https://blueprints.launchpad.net/zun/+spec/use-placement-resource-management Change-Id: I2d85911c4504e541d2994ce3d48e2fbb1090b813
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=======================
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Zun - Container service
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=======================
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"Zun is an OpenStack Container service. It aims to provide an
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OpenStack API for provisioning and managing containerized
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workload on OpenStack."
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For more details about Zun, see `OpenStack Zun Documentation
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<https://docs.openstack.org/zun/latest/>`__.
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Preparation and Deployment
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--------------------------
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By default Zun and its dependencies are disabled.
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In order to enable Zun, you need to edit globals.yml and set the
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following variables:
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.. code-block:: yaml
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enable_zun: "yes"
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enable_kuryr: "yes"
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enable_etcd: "yes"
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enable_placement: "yes"
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docker_configure_for_zun: "yes"
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Docker reconfiguration requires reboostrapping before deploy.
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Make sure you understand the consequences of restarting Docker.
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Please see :ref:`rebootstrapping` for details.
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If it's initial deploy, then there is nothing to worry about
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because it's initial bootstrapping as well and there are no
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running services to affect.
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.. code-block:: console
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$ kolla-ansible bootstrap-servers
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Finally deploy:
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.. code-block:: console
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$ kolla-ansible deploy
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Verification
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------------
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#. Generate the credentials file:
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.. code-block:: console
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$ kolla-ansible post-deploy
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#. Source credentials file:
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.. code-block:: console
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$ . /etc/kolla/admin-openrc.sh
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#. Download and create a glance container image:
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.. code-block:: console
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$ docker pull cirros
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$ docker save cirros | openstack image create cirros --public \
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--container-format docker --disk-format raw
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#. Create zun container:
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.. code-block:: console
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$ zun create --name test --net network=demo-net cirros ping -c4 8.8.8.8
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.. note::
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Kuryr does not support networks with DHCP enabled, disable DHCP in the
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subnet used for zun containers.
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.. code-block:: console
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$ openstack subnet set --no-dhcp <subnet>
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#. Verify container is created:
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.. code-block:: console
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$ zun list
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+--------------------------------------+------+---------------+---------+------------+------------+-------+
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| uuid | name | image | status | task_state | addresses | ports |
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+--------------------------------------+------+---------------+---------+------------+------------+-------+
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| 3719a73e-5f86-47e1-bc5f-f4074fc749f2 | test | cirros | Created | None | 172.17.0.3 | [] |
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+--------------------------------------+------+---------------+---------+------------+------------+-------+
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#. Start container:
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.. code-block:: console
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$ zun start test
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Request to start container test has been accepted.
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#. Verify container:
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.. code-block:: console
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$ zun logs test
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PING 8.8.8.8 (8.8.8.8): 56 data bytes
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64 bytes from 8.8.8.8: seq=0 ttl=45 time=96.396 ms
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64 bytes from 8.8.8.8: seq=1 ttl=45 time=96.504 ms
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64 bytes from 8.8.8.8: seq=2 ttl=45 time=96.721 ms
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64 bytes from 8.8.8.8: seq=3 ttl=45 time=95.884 ms
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--- 8.8.8.8 ping statistics ---
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4 packets transmitted, 4 packets received, 0% packet loss
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round-trip min/avg/max = 95.884/96.376/96.721 ms
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For more information about how zun works, see
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`zun, OpenStack Container service <https://docs.openstack.org/zun/latest/>`__.
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