115 lines
2.9 KiB
ReStructuredText
115 lines
2.9 KiB
ReStructuredText
Zun in Kolla
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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." [1].
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Preparation and Deployment
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--------------------------
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Zun requires kuryr and etcd services, for more information about how to
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configure kuryr refer to :doc:`kuryr-guide`.
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To allow Zun Compute connect to the Docker Daemon, add the following in the
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``docker.service`` file on each zun-compute node.
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ExecStart= -H tcp://<DOCKER_SERVICE_IP>:2375 -H unix:///var/run/docker.sock --cluster-store=etcd://<DOCKER_SERVICE_IP>:2379 --cluster-advertise=<DOCKER_SERVICE_IP>:2375
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.. note::
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``DOCKER_SERVICE_IP`` is zun-compute host IP address. ``2375`` is port that
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allows Docker daemon to be accessed remotely.
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By default zun is disabled in the ``group_vars/all.yml``.
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In order to enable it, you need to edit the file globals.yml and set the
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following variables:
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::
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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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Deploy the OpenStack cloud and zun.
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::
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$ kolla-ansible deploy
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Verify
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------
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Generate the credentials file.
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::
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$ kolla-ansible post-deploy
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Source credentials file.
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::
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$ . /etc/kolla/admin-openrc.sh
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Download and create a glance container image.
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::
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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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::
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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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::
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openstack subnet set --no-dhcp <subnet>
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Verify container is created.
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::
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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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$ 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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::
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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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