Chapter 7. Containerized services

Director installs the core OpenStack Platform services as containers on the overcloud. This section provides some background information on how containerized services work.

7.1. Containerized service architecture

Director installs the core OpenStack Platform services as containers on the overcloud. The templates for the containerized services are located in the /usr/share/openstack-tripleo-heat-templates/deployment/.

You must enable the OS::TripleO::Services::Podman service in the role for all nodes that use containerized services. When you create a roles_data.yaml file for your custom roles configuration, include the OS::TripleO::Services::Podman service along with the base composable services. For example, the IronicConductor role uses the following role definition:

- name: IronicConductor
  description: |
    Ironic Conductor node role
  networks:
    InternalApi:
      subnet: internal_api_subnet
    Storage:
      subnet: storage_subnet
  HostnameFormatDefault: '%stackname%-ironic-%index%'
  ServicesDefault:
    - OS::TripleO::Services::Aide
    - OS::TripleO::Services::AuditD
    - OS::TripleO::Services::BootParams
    - OS::TripleO::Services::CACerts
    - OS::TripleO::Services::CertmongerUser
    - OS::TripleO::Services::Collectd
    - OS::TripleO::Services::Docker
    - OS::TripleO::Services::Fluentd
    - OS::TripleO::Services::IpaClient
    - OS::TripleO::Services::Ipsec
    - OS::TripleO::Services::IronicConductor
    - OS::TripleO::Services::IronicPxe
    - OS::TripleO::Services::Kernel
    - OS::TripleO::Services::LoginDefs
    - OS::TripleO::Services::MetricsQdr
    - OS::TripleO::Services::MySQLClient
    - OS::TripleO::Services::ContainersLogrotateCrond
    - OS::TripleO::Services::Podman
    - OS::TripleO::Services::Rhsm
    - OS::TripleO::Services::SensuClient
    - OS::TripleO::Services::Snmp
    - OS::TripleO::Services::Timesync
    - OS::TripleO::Services::Timezone
    - OS::TripleO::Services::TripleoFirewall
    - OS::TripleO::Services::TripleoPackages
    - OS::TripleO::Services::Tuned

7.2. Containerized service parameters

Each containerized service template contains an outputs section that defines a data set passed to the OpenStack Orchestration (heat) service. In addition to the standard composable service parameters (see Section 6.2.4, “Examining role parameters”), the template contains a set of parameters specific to the container configuration.

puppet_config

Data to pass to Puppet when configuring the service. In the initial overcloud deployment steps, director creates a set of containers used to configure the service before the actual containerized service runs. This parameter includes the following sub-parameters:

  • config_volume - The mounted volume that stores the configuration.
  • puppet_tags - Tags to pass to Puppet during configuration. OpenStack uses these tags to restrict the Puppet run to the configuration resource of a particular service. For example, the OpenStack Identity (keystone) containerized service uses the keystone_config tag to ensure that all require only the keystone_config Puppet resource run on the configuration container.
  • step_config - The configuration data passed to Puppet. This is usually inherited from the referenced composable service.
  • config_image - The container image used to configure the service.
kolla_config
A set of container-specific data that defines configuration file locations, directory permissions, and the command to run on the container to launch the service.
docker_config

Tasks to run on the configuration container for the service. All tasks are grouped into the following steps to help director perform a staged deployment:

  • Step 1 - Load balancer configuration
  • Step 2 - Core services (Database, Redis)
  • Step 3 - Initial configuration of OpenStack Platform service
  • Step 4 - General OpenStack Platform services configuration
  • Step 5 - Service activation
host_prep_tasks
Preparation tasks for the bare metal node to accommodate the containerized service.

7.3. Preparing container images

The overcloud installation requires an environment file to determine where to obtain container images and how to store them. Generate and customize this environment file that you can use to prepare your container images.

Note

If you need to configure specific container image versions for your overcloud, you must pin the images to a specific version. For more information, see Pinning container images for the overcloud.

Procedure

  1. Log in to your undercloud host as the stack user.
  2. Generate the default container image preparation file:

    $ openstack tripleo container image prepare default \
      --local-push-destination \
      --output-env-file containers-prepare-parameter.yaml

    This command includes the following additional options:

    • --local-push-destination sets the registry on the undercloud as the location for container images. This means that director pulls the necessary images from the Red Hat Container Catalog and pushes them to the registry on the undercloud. Director uses this registry as the container image source. To pull directly from the Red Hat Container Catalog, omit this option.
    • --output-env-file is an environment file name. The contents of this file include the parameters for preparing your container images. In this case, the name of the file is containers-prepare-parameter.yaml.

      Note

      You can use the same containers-prepare-parameter.yaml file to define a container image source for both the undercloud and the overcloud.

  3. Modify the containers-prepare-parameter.yaml to suit your requirements.

7.4. Container image preparation parameters

The default file for preparing your containers (containers-prepare-parameter.yaml) contains the ContainerImagePrepare heat parameter. This parameter defines a list of strategies for preparing a set of images:

parameter_defaults:
  ContainerImagePrepare:
  - (strategy one)
  - (strategy two)
  - (strategy three)
  ...

Each strategy accepts a set of sub-parameters that defines which images to use and what to do with the images. The following table contains information about the sub-parameters that you can use with each ContainerImagePrepare strategy:

ParameterDescription

excludes

List of regular expressions to exclude image names from a strategy.

includes

List of regular expressions to include in a strategy. At least one image name must match an existing image. All excludes are ignored if includes is specified.

modify_append_tag

String to append to the tag for the destination image. For example, if you pull an image with the tag 16.1.3-5.161 and set the modify_append_tag to -hotfix, the director tags the final image as 16.1.3-5.161-hotfix.

modify_only_with_labels

A dictionary of image labels that filter the images that you want to modify. If an image matches the labels defined, the director includes the image in the modification process.

modify_role

String of ansible role names to run during upload but before pushing the image to the destination registry.

modify_vars

Dictionary of variables to pass to modify_role.

push_destination

Defines the namespace of the registry that you want to push images to during the upload process.

  • If set to true, the push_destination is set to the undercloud registry namespace using the hostname, which is the recommended method.
  • If set to false, the push to a local registry does not occur and nodes pull images directly from the source.
  • If set to a custom value, director pushes images to an external local registry.

If you set this parameter to false in production environments while pulling images directly from Red Hat Container Catalog, all overcloud nodes will simultaneously pull the images from the Red Hat Container Catalog over your external connection, which can cause bandwidth issues. Only use false to pull directly from a Red Hat Satellite Server hosting the container images.

If the push_destination parameter is set to false or is not defined and the remote registry requires authentication, set the ContainerImageRegistryLogin parameter to true and include the credentials with the ContainerImageRegistryCredentials parameter.

pull_source

The source registry from where to pull the original container images.

set

A dictionary of key: value definitions that define where to obtain the initial images.

tag_from_label

Use the value of specified container image metadata labels to create a tag for every image and pull that tagged image. For example, if you set tag_from_label: {version}-{release}, director uses the version and release labels to construct a new tag. For one container, version might be set to 16.1.3 and release might be set to 5.161, which results in the tag 16.1.3-5.161. Director uses this parameter only if you have not defined tag in the set dictionary.

Important

When you push images to the undercloud, use push_destination: true instead of push_destination: UNDERCLOUD_IP:PORT. The push_destination: true method provides a level of consistency across both IPv4 and IPv6 addresses.

The set parameter accepts a set of key: value definitions:

KeyDescription

ceph_image

The name of the Ceph Storage container image.

ceph_namespace

The namespace of the Ceph Storage container image.

ceph_tag

The tag of the Ceph Storage container image.

name_prefix

A prefix for each OpenStack service image.

name_suffix

A suffix for each OpenStack service image.

namespace

The namespace for each OpenStack service image.

neutron_driver

The driver to use to determine which OpenStack Networking (neutron) container to use. Use a null value to set to the standard neutron-server container. Set to ovn to use OVN-based containers.

tag

Sets a specific tag for all images from the source. If not defined, director uses the Red Hat OpenStack Platform version number as the default value. This parameter takes precedence over the tag_from_label value.

Note

The container images use multi-stream tags based on the Red Hat OpenStack Platform version. This means that there is no longer a latest tag.

7.5. Guidelines for container image tagging

The Red Hat Container Registry uses a specific version format to tag all Red Hat OpenStack Platform container images. This format follows the label metadata for each container, which is version-release.

version
Corresponds to a major and minor version of Red Hat OpenStack Platform. These versions act as streams that contain one or more releases.
release
Corresponds to a release of a specific container image version within a version stream.

For example, if the latest version of Red Hat OpenStack Platform is 16.1.3 and the release for the container image is 5.161, then the resulting tag for the container image is 16.1.3-5.161.

The Red Hat Container Registry also uses a set of major and minor version tags that link to the latest release for that container image version. For example, both 16.1 and 16.1.3 link to the latest release in the 16.1.3 container stream. If a new minor release of 16.1 occurs, the 16.1 tag links to the latest release for the new minor release stream while the 16.1.3 tag continues to link to the latest release within the 16.1.3 stream.

The ContainerImagePrepare parameter contains two sub-parameters that you can use to determine which container image to download. These sub-parameters are the tag parameter within the set dictionary, and the tag_from_label parameter. Use the following guidelines to determine whether to use tag or tag_from_label.

  • The default value for tag is the major version for your OpenStack Platform version. For this version it is 16.1. This always corresponds to the latest minor version and release.

    parameter_defaults:
      ContainerImagePrepare:
      - set:
          ...
          tag: 16.1
          ...
  • To change to a specific minor version for OpenStack Platform container images, set the tag to a minor version. For example, to change to 16.1.2, set tag to 16.1.2.

    parameter_defaults:
      ContainerImagePrepare:
      - set:
          ...
          tag: 16.1.2
          ...
  • When you set tag, director always downloads the latest container image release for the version set in tag during installation and updates.
  • If you do not set tag, director uses the value of tag_from_label in conjunction with the latest major version.

    parameter_defaults:
      ContainerImagePrepare:
      - set:
          ...
          # tag: 16.1
          ...
        tag_from_label: '{version}-{release}'
  • The tag_from_label parameter generates the tag from the label metadata of the latest container image release it inspects from the Red Hat Container Registry. For example, the labels for a certain container might use the following version and release metadata:

      "Labels": {
        "release": "5.161",
        "version": "16.1.3",
        ...
      }
  • The default value for tag_from_label is {version}-{release}, which corresponds to the version and release metadata labels for each container image. For example, if a container image has 16.1.3 set for version and 5.161 set for release, the resulting tag for the container image is 16.1.3-5.161.
  • The tag parameter always takes precedence over the tag_from_label parameter. To use tag_from_label, omit the tag parameter from your container preparation configuration.
  • A key difference between tag and tag_from_label is that director uses tag to pull an image only based on major or minor version tags, which the Red Hat Container Registry links to the latest image release within a version stream, while director use tag_from_label to perform a metadata inspection of each container image so that director generates a tag and pulls the corresponding image.

7.6. Obtaining container images from private registries

The registry.redhat.io registry requires authentication to access and pull images. To authenticate with registry.redhat.io and other private registries, include the ContainerImageRegistryCredentials and ContainerImageRegistryLogin parameters in your containers-prepare-parameter.yaml file.

ContainerImageRegistryCredentials

Some container image registries require authentication to access images. In this situation, use the ContainerImageRegistryCredentials parameter in your containers-prepare-parameter.yaml environment file. The ContainerImageRegistryCredentials parameter uses a set of keys based on the private registry URL. Each private registry URL uses its own key and value pair to define the username (key) and password (value). This provides a method to specify credentials for multiple private registries.

parameter_defaults:
  ContainerImagePrepare:
  - push_destination: true
    set:
      namespace: registry.redhat.io/...
      ...
  ContainerImageRegistryCredentials:
    registry.redhat.io:
      my_username: my_password

In the example, replace my_username and my_password with your authentication credentials. Instead of using your individual user credentials, Red Hat recommends creating a registry service account and using those credentials to access registry.redhat.io content.

To specify authentication details for multiple registries, set multiple key-pair values for each registry in ContainerImageRegistryCredentials:

parameter_defaults:
  ContainerImagePrepare:
  - push_destination: true
    set:
      namespace: registry.redhat.io/...
      ...
  - push_destination: true
    set:
      namespace: registry.internalsite.com/...
      ...
  ...
  ContainerImageRegistryCredentials:
    registry.redhat.io:
      myuser: 'p@55w0rd!'
    registry.internalsite.com:
      myuser2: '0th3rp@55w0rd!'
    '192.0.2.1:8787':
      myuser3: '@n0th3rp@55w0rd!'
Important

The default ContainerImagePrepare parameter pulls container images from registry.redhat.io, which requires authentication.

For more information, see "Red Hat Container Registry Authentication".

ContainerImageRegistryLogin

The ContainerImageRegistryLogin parameter is used to control whether an overcloud node system needs to log in to the remote registry to fetch the container images. This situation occurs when you want the overcloud nodes to pull images directly, rather than use the undercloud to host images.

You must set ContainerImageRegistryLogin to true if push_destination is set to false or not used for a given strategy.

parameter_defaults:
  ContainerImagePrepare:
  - push_destination: false
    set:
      namespace: registry.redhat.io/...
      ...
  ...
  ContainerImageRegistryCredentials:
    registry.redhat.io:
      myuser: 'p@55w0rd!'
  ContainerImageRegistryLogin: true

However, if the overcloud nodes do not have network connectivity to the registry hosts defined in ContainerImageRegistryCredentials and you set ContainerImageRegistryLogin to true, the deployment might fail when trying to perform a login. If the overcloud nodes do not have network connectivity to the registry hosts defined in the ContainerImageRegistryCredentials, set push_destination to true and ContainerImageRegistryLogin to false so that the overcloud nodes pull images from the undercloud.

parameter_defaults:
  ContainerImagePrepare:
  - push_destination: true
    set:
      namespace: registry.redhat.io/...
      ...
  ...
  ContainerImageRegistryCredentials:
    registry.redhat.io:
      myuser: 'p@55w0rd!'
  ContainerImageRegistryLogin: false

7.7. Layering image preparation entries

The value of the ContainerImagePrepare parameter is a YAML list. This means that you can specify multiple entries. The following example demonstrates two entries where director uses the latest version of all images except for the nova-api image, which uses the version tagged with 16.0-44:

ContainerImagePrepare:
- tag_from_label: "{version}-{release}"
  push_destination: true
  excludes:
  - nova-api
  set:
    namespace: registry.redhat.io/rhosp-rhel8
    name_prefix: openstack-
    name_suffix: ''
- push_destination: true
  includes:
  - nova-api
  set:
    namespace: registry.redhat.io/rhosp-rhel8
    tag: 16.1-44

The includes and excludes parameters use regular expressions to control image filtering for each entry. The images that match the includes strategy take precedence over excludes matches. The image name must the includes or excludes regular expression value to be considered a match.

7.8. Modifying images during preparation

It is possible to modify images during image preparation, and then immediately deploy the overcloud with modified images.

Note

Red Hat OpenStack Platform (RHOSP) director supports modifying images during preparation for RHOSP containers, not for Ceph containers.

Scenarios for modifying images include:

  • As part of a continuous integration pipeline where images are modified with the changes being tested before deployment.
  • As part of a development workflow where local changes must be deployed for testing and development.
  • When changes must be deployed but are not available through an image build pipeline. For example, adding proprietary add-ons or emergency fixes.

To modify an image during preparation, invoke an Ansible role on each image that you want to modify. The role takes a source image, makes the requested changes, and tags the result. The prepare command can push the image to the destination registry and set the heat parameters to refer to the modified image.

The Ansible role tripleo-modify-image conforms with the required role interface and provides the behaviour necessary for the modify use cases. Control the modification with the modify-specific keys in the ContainerImagePrepare parameter:

  • modify_role specifies the Ansible role to invoke for each image to modify.
  • modify_append_tag appends a string to the end of the source image tag. This makes it obvious that the resulting image has been modified. Use this parameter to skip modification if the push_destination registry already contains the modified image. Change modify_append_tag whenever you modify the image.
  • modify_vars is a dictionary of Ansible variables to pass to the role.

To select a use case that the tripleo-modify-image role handles, set the tasks_from variable to the required file in that role.

While developing and testing the ContainerImagePrepare entries that modify images, run the image prepare command without any additional options to confirm that the image is modified as you expect:

sudo openstack tripleo container image prepare \
  -e ~/containers-prepare-parameter.yaml
Important

To use the openstack tripleo container image prepare command, your undercloud must contain a running image-serve registry. As a result, you cannot run this command before a new undercloud installation because the image-serve registry will not be installed. You can run this command after a successful undercloud installation.

7.9. Updating existing packages on container images

Note
Red Hat OpenStack Platform (RHOSP) director supports updating existing packages on container images for RHOSP containers, not for Ceph containers.

Procedure

  • The following example ContainerImagePrepare entry updates in all packages on the container images by using the dnf repository configuration of the undercloud host:

    ContainerImagePrepare:
    - push_destination: true
      ...
      modify_role: tripleo-modify-image
      modify_append_tag: "-updated"
      modify_vars:
        tasks_from: yum_update.yml
        compare_host_packages: true
        yum_repos_dir_path: /etc/yum.repos.d
      ...

7.10. Installing additional RPM files to container images

You can install a directory of RPM files in your container images. This is useful for installing hotfixes, local package builds, or any package that is not available through a package repository.

Note

Red Hat OpenStack Platform (RHOSP) director supports installing additional RPM files to container images for RHOSP containers, not for Ceph containers.

Procedure

  • The following example ContainerImagePrepare entry installs some hotfix packages on only the nova-compute image:

    ContainerImagePrepare:
    - push_destination: true
      ...
      includes:
      - nova-compute
      modify_role: tripleo-modify-image
      modify_append_tag: "-hotfix"
      modify_vars:
        tasks_from: rpm_install.yml
        rpms_path: /home/stack/nova-hotfix-pkgs
      ...

7.11. Modifying container images with a custom Dockerfile

You can specify a directory that contains a Dockerfile to make the required changes. When you invoke the tripleo-modify-image role, the role generates a Dockerfile.modified file that changes the FROM directive and adds extra LABEL directives.

Note

Red Hat OpenStack Platform (RHOSP) director supports modifying container images with a custom Dockerfile for RHOSP containers, not for Ceph containers.

Procedure

  1. The following example runs the custom Dockerfile on the nova-compute image:

    ContainerImagePrepare:
    - push_destination: true
      ...
      includes:
      - nova-compute
      modify_role: tripleo-modify-image
      modify_append_tag: "-hotfix"
      modify_vars:
        tasks_from: modify_image.yml
        modify_dir_path: /home/stack/nova-custom
      ...
  2. The following example shows the /home/stack/nova-custom/Dockerfile file. After you run any USER root directives, you must switch back to the original image default user:

    FROM registry.redhat.io/rhosp-rhel8/openstack-nova-compute:latest
    
    USER "root"
    
    COPY customize.sh /tmp/
    RUN /tmp/customize.sh
    
    USER "nova"

7.12. Deploying a vendor plugin

To use some third-party hardware as a Block Storage back end, you must deploy a vendor plugin. The following example demonstrates how to deploy a vendor plugin to use Dell EMC hardware as a Block Storage back end.

For more information about supported back end appliances and drivers, see Third-Party Storage Providers in the Storage Guide.

Procedure

  1. Create a new container images file for your overcloud:

    $ openstack tripleo container image prepare default \
        --local-push-destination \
        --output-env-file containers-prepare-parameter-dellemc.yaml
  2. Edit the containers-prepare-parameter-dellemc.yaml file.
  3. Add an exclude parameter to the strategy for the main Red Hat OpenStack Platform container images. Use this parameter to exclude the container image that the vendor container image will replace. In the example, the container image is the cinder-volume image:

    parameter_defaults:
      ContainerImagePrepare:
        - push_destination: true
          excludes:
      	   - cinder-volume
          set:
            namespace: registry.redhat.io/rhosp-rhel8
            name_prefix: openstack-
            name_suffix: ''
            tag: 16.1
            ...
          tag_from_label: "{version}-{release}"
  4. Add a new strategy to the ContainerImagePrepare parameter that includes the replacement container image for the vendor plugin:

    parameter_defaults:
      ContainerImagePrepare:
        ...
        - push_destination: true
          includes:
            - cinder-volume
          set:
            namespace: registry.connect.redhat.com/dellemc
            name_prefix: openstack-
            name_suffix: -dellemc-rhosp16
            tag: 16.1-2
            ...
  5. Add the authentication details for the registry.connect.redhat.com registry to the ContainerImageRegistryCredentials parameter:

    parameter_defaults:
      ContainerImageRegistryCredentials:
        registry.redhat.io:
          [service account username]: [service account password]
        registry.connect.redhat.com:
          [service account username]: [service account password]
  6. Save the containers-prepare-parameter-dellemc.yaml file.
  7. Include the containers-prepare-parameter-dellemc.yaml file with any deployment commands, such as as openstack overcloud deploy:

    $ openstack overcloud deploy --templates
        ...
        -e containers-prepare-parameter-dellemc.yaml
        ...

    When director deploys the overcloud, the overcloud uses the vendor container image instead of the standard container image.

    IMPORTANT
    The containers-prepare-parameter-dellemc.yaml file replaces the standard containers-prepare-parameter.yaml file in your overcloud deployment. Do not include the standard containers-prepare-parameter.yaml file in your overcloud deployment. Retain the standard containers-prepare-parameter.yaml file for your undercloud installation and updates.