hongbin 1eeb3a5395 Revert "zun: Deprecate Zun provisionally"
This reverts commit f8d4db54db8f2ab2c7f99f0fcbc456177d33ddad.

Reason for revert: Zun was deprecated due to the hard dependency on old version of docker and etcd. Right now, the problem was fixed.

Change-Id: I9fe760e2b9b774b5ea623e6b305de004fc0c6dd2
2024-01-22 12:25:51 +00:00

3.3 KiB

Zun - Container service

"Zun is an OpenStack Container service. It aims to provide an OpenStack API for provisioning and managing containerized workload on OpenStack." For more details about Zun, see OpenStack Zun Documentation.

Preparation and Deployment

By default Zun and its dependencies are disabled. In order to enable Zun, you need to edit globals.yml and set the following variables:

enable_zun: "yes"
enable_kuryr: "yes"
enable_etcd: "yes"
docker_configure_for_zun: "yes"
containerd_configure_for_zun: "yes"

Docker reconfiguration requires rebootstrapping before deploy. Make sure you understand the consequences of restarting Docker. Please see rebootstrapping for details. If it's initial deploy, then there is nothing to worry about because it's initial bootstrapping as well and there are no running services to affect.

$ kolla-ansible bootstrap-servers

Finally deploy:

$ kolla-ansible deploy

Verification

  1. Generate the credentials file:

    $ kolla-ansible post-deploy
  2. Source credentials file:

    $ . /etc/kolla/admin-openrc.sh
  3. Download and create a glance container image:

    $ docker pull cirros
    $ docker save cirros | openstack image create cirros --public \
      --container-format docker --disk-format raw
  4. Create zun container:

    $ zun create --name test --net network=demo-net cirros ping -c4 8.8.8.8

    Note

    Kuryr does not support networks with DHCP enabled, disable DHCP in the subnet used for zun containers.

    $ openstack subnet set --no-dhcp <subnet>
  5. Verify container is created:

    $ zun list
    
    +--------------------------------------+------+---------------+---------+------------+------------+-------+
    | uuid                                 | name | image         | status  | task_state | addresses  | ports |
    +--------------------------------------+------+---------------+---------+------------+------------+-------+
    | 3719a73e-5f86-47e1-bc5f-f4074fc749f2 | test | cirros        | Created | None       | 172.17.0.3 | []    |
    +--------------------------------------+------+---------------+---------+------------+------------+-------+
  6. Start container:

    $ zun start test
    Request to start container test has been accepted.
  7. Verify container:

    $ zun logs test
    PING 8.8.8.8 (8.8.8.8): 56 data bytes
    64 bytes from 8.8.8.8: seq=0 ttl=45 time=96.396 ms
    64 bytes from 8.8.8.8: seq=1 ttl=45 time=96.504 ms
    64 bytes from 8.8.8.8: seq=2 ttl=45 time=96.721 ms
    64 bytes from 8.8.8.8: seq=3 ttl=45 time=95.884 ms
    
    --- 8.8.8.8 ping statistics ---
    4 packets transmitted, 4 packets received, 0% packet loss
    round-trip min/avg/max = 95.884/96.376/96.721 ms

For more information about how zun works, see zun, OpenStack Container service.