Generating Manifests and Metadata

This document describes how to manage packaging and shipping your Operator in the following stages:

  • Generate your first release - encapsulate the metadata needed to install your Operator with the Operator Lifecycle Manager and configure the permissions it needs from the generated SDK files.
  • Update your Operator - apply any updates to Operator manifests made during development.
  • Upgrade your Operator - carry over any customizations you have made and ensure a rolling update to the next version of your Operator.

Overview

Several operator-sdk subcommands manage operator-framework manifests and metadata, in particular ClusterServiceVersion‘s (CSVs), for an Operator: generate bundle, generate packagemanifests, and generate kustomize manifests. See this CLI overview for details on each command. These manifests come in two different formats, bundle and package manifests, which are described in detail below. Ideally the bundle format should be used as this is the default packaging format in operator-framework. However the package manifests format is still supported by operator-framework tooling.

Kustomize files

operator-sdk generate kustomize manifests generates a CSV kustomize base config/manifests/bases/<operator-name>.clusterserviceversion.yaml and a config/manifests/bases/kustomization.yaml by default. These files are required as kustomize build input in downstream commands.

By default, the command starts an interactive prompt if a CSV base in config/manifests/bases is not present to collect UI metadata. You can disable the interactive prompt by passing --kustomize=false.

  1. $ operator-sdk generate kustomize manifests
  2. INFO[0000] Generating CSV manifest version 0.1.0
  4. Display name for the operator (required):
  5. > memcached
  7. Comma-separated list of keywords for your operator (required):
  8. > app, operator
  9. ...

For Go Operators only: the command parses CSV markers from Go API type definitions, located in ./api for single group projects and ./apis for multigroup projects, to populate certain CSV fields. You can set an alternative path to the API types root directory with --apis-dir. These markers are not available to Ansible or Helm project types.

ClusterServiceVersion manifests

CSV’s are manifests that define all aspects of an Operator, from what CustomResourceDefinitions (CRDs) it uses to metadata describing the Operator’s maintainers. They are typically versioned by semver, much like Operator projects themselves; this version is present in both their metadata.name and spec.version fields. The CSV generator called by generate <bundle|packagemanifests> requires certain input manifests to construct a CSV manifest; all inputs are read when either command is invoked, along with a CSV’s base, to idempotently regenerate a CSV.

The following resource kinds are typically included in a CSV, which are addressed by config/manifests/bases/kustomization.yaml:

  • Role: define Operator permissions within a namespace.
  • ClusterRole: define cluster-wide Operator permissions.
  • Deployment: define how the Operator’s operand is run in pods.
  • CustomResourceDefinition: definitions of custom objects your Operator reconciles.
  • Custom resource examples: examples of objects adhering to the spec of a particular CRD.

Generate your first release

You’ve recently run operator-sdk init and created your APIs with operator-sdk create api. Now you’d like to package your Operator for deployment by OLM. Your Operator is at version v0.0.1; the Makefile variable VERSION should be set to 0.0.1.

Bundle format

A bundle consists of manifests (CSV and CRDs) and metadata that define an Operator at a particular version. You may have also heard of a bundle image. From the bundle docs:

An Operator Bundle is built as a scratch (non-runnable) container image that contains operator manifests and specific metadata in designated directories inside the image. Then, it can be pushed and pulled from an OCI-compliant container registry. Ultimately, an operator bundle will be used by Operator Registry and OLM to install an operator in OLM-enabled clusters.

At this stage in your Operator’s development, we only need to worry about generating bundle files; bundle images become important once you’re ready to publish your Operator.

SDK projects are scaffolded with a Makefile containing the bundle recipe by default, which wraps generate kustomize manifests, generate bundle, and other related commands.

By default make bundle will generate a CSV, copy CRDs, and generate metadata in the bundle format:

  1. $ make bundle
  2. $ tree ./bundle
  3. ./bundle
  4. ├── manifests
  5. │   ├── cache.my.domain_memcacheds.yaml
  6. │   └── memcached-operator.clusterserviceversion.yaml
  7. └── metadata
  8.     └── annotations.yaml

Bundle metadata in bundle/metadata/annotations.yaml contains information about a particular Operator version available in a registry. OLM uses this information to install specific Operator versions and resolve dependencies. That file and bundle.Dockerfile contain the same annotations, the latter as LABELs, which do not need to be modified in most cases; if you do decide to modify them, both sets of annotations must be the same to ensure consistent Operator deployment.

Channels

Metadata for each bundle contains channel information as well:

Channels allow package authors to write different upgrade paths for different users (e.g. beta vs. stable).

Channels become important when publishing, but we should still be aware of them beforehand as they’re required values in our metadata. make bundle writes the channel alpha by default.

Package manifests format

A package manifests format consists of on-disk manifests (CSV and CRDs) and metadata that define an Operator at all versions of that Operator. Each version is contained in its own directory, with a parent package manifest YAML file containing channel-to-version mappings, much like a bundle’s metadata.

If your Operator is already formatted as a package manifests and you do not wish to migrate to the bundle format yet, you should add the following to your Makefile to make development easier:

  1. # Options for "packagemanifests".
  2. ifneq ($(origin FROM_VERSION), undefined)
  3. PKG_FROM_VERSION := --from-version=$(FROM_VERSION)
  4. endif
  5. ifneq ($(origin CHANNEL), undefined)
  6. PKG_CHANNELS := --channel=$(CHANNEL)
  7. endif
  8. ifeq ($(IS_CHANNEL_DEFAULT), 1)
  9. PKG_IS_DEFAULT_CHANNEL := --default-channel
  10. endif
  11. PKG_MAN_OPTS ?= $(FROM_VERSION) $(PKG_CHANNELS) $(PKG_IS_DEFAULT_CHANNEL)
  13. # Generate package manifests.
  14. packagemanifests: manifests
  15.   operator-sdk generate kustomize manifests -q
  16.   kustomize build config/manifests | operator-sdk generate packagemanifests -q --version $(VERSION) $(PKG_MAN_OPTS)

By default make packagemanifests will generate a CSV, a package manifest file, and copy CRDs in the package manifests format:

  1. $ make packagemanifests
  2. $ tree ./packagemanifests
  3. ./packagemanifests
  4. ├── 0.0.1
  5. │   ├── cache.my.domain_memcacheds.yaml
  6. │   └── memcached-operator.clusterserviceversion.yaml
  7. └── memcached-operator.package.yaml

Update your Operator

Let’s say you added a new API App with group app and version v1alpha1 to your Operator project, and added a port to your manager Deployment in config/manager/manager.yaml.

If using a bundle format, the current version of your CSV can be updated by running:

  1. $ make bundle

If using a package manifests format, run:

  1. $ make packagemanifests

Running the command for either format will append your new CRD to spec.customresourcedefinitions.owned, replace the old data at spec.install.spec.deployments with your updated Deployment, and update your existing CSV manifest. The SDK will not overwrite user-defined fields like spec.maintainers.

Upgrade your Operator

Let’s say you’re upgrading your Operator to version v0.0.2, and you’ve already updated the VERSION variable in your Makefile to 0.0.2. You also want to add a new channel beta, and use it as the default channel.

If using a bundle format, a new version of your CSV can be created by running:

  1. $ make bundle CHANNELS=beta DEFAULT_CHANNEL=beta

If using a package manifests format, run:

  1. $ make packagemanifests FROM_VERSION=0.0.1 CHANNEL=beta IS_CHANNEL_DEFAULT=1

Running the command for either format will persist user-defined fields, updates spec.version, and populates spec.replaces with the old CSV version’s name.

CSV fields

Below are two lists of fields: the first is a list of all fields the SDK and OLM expect in a CSV, and the second are optional.

For Go Operators only: Several fields require user input (labeled user) or a CSV marker (labeled marker). This list may change as the SDK becomes better at generating CSV’s. These markers are not available to Ansible or Helm project types.

Required:

  • metadata.name: a unique name for this CSV of the format <operator-name>.vX.Y.Z, ex. app-operator.v0.0.1.
  • spec.version: semantic version of the Operator, ex. 0.0.1.
  • spec.installModes: what mode of installation namespacing OLM should use. Currently all but MultiNamespace are supported by SDK Operators.
  • spec.customresourcedefinitions: any CRDs the Operator uses. Certain fields in elements of owned will be filled by the SDK.
    • owned: all CRDs the Operator deploys itself from it’s bundle.
      • name: CRD’s metadata.name.
      • kind: CRD’s metadata.spec.names.kind.
      • version: CRD’s metadata.spec.version.
      • description (marker) : description of the CRD.
      • displayName (marker) : display name of the CRD.
      • resources (marker) : any Kubernetes resources used by the CRD, ex. Pod‘s and ConfigMap‘s.
      • specDescriptors (marker) : UI hints for inputs and outputs of the Operator’s spec.
      • statusDescriptors (marker) : UI hints for inputs and outputs of the Operator’s status.
      • actionDescriptors (user) : UI hints for an Operator’s in-cluster actions.
    • required (user) : all CRDs the Operator expects to be present in-cluster, if any. All required element fields must be populated manually.

Optional:

  • spec.description (user) : a thorough description of the Operator’s functionality.
  • spec.displayName (user) : a name to display for the Operator in Operator Hub.
  • spec.keywords (user) : a list of keywords describing the Operator.
  • spec.maintainers (user) : a list of human or organizational entities maintaining the Operator, with a name and email.
  • spec.provider (user) : the Operator provider, with a name; usually an organization.
  • spec.labels (user) : a list of key:value pairs to be used by Operator internals.
  • metadata.annotations.alm-examples: CR examples, in JSON string literal format, for your CRD’s. Ideally one per CRD.
  • metadata.annotations.capabilities: level of Operator capability. See the Operator maturity model for a list of valid values.
  • spec.replaces: the name of the CSV being replaced by this CSV.
  • spec.links (user) : a list of URL’s to websites, documentation, etc. pertaining to the Operator or application being managed, each with a name and url.
  • spec.selector (user) : selectors by which the Operator can pair resources in a cluster.
  • spec.icon (user) : a base64-encoded icon unique to the Operator, set in a base64data field with a mediatype.
  • spec.maturity: the Operator’s maturity, ex. alpha.

Last modified July 24, 2020: [v0.19.x] cmd/operator-sdk/generate/packagemanifests: add `—from-version` flag (#3509) (#3524) (a48569c6)