红帽全球峰会6.32. Operator Lifecycle Manager (OLM) Classic Operators
The following sections pertain to Operator Lifecycle Manager (OLM) Classic that has been included with OpenShift Container Platform 4 since its initial release. For OLM v1, see Operator Lifecycle Manager (OLM) v1 Operators.
Operator Lifecycle Manager (OLM) Classic helps users install, update, and manage the lifecycle of Kubernetes native applications (Operators) and their associated services running across their OpenShift Container Platform clusters. It is part of the Operator Framework, an open source toolkit designed to manage Operators in an effective, automated, and scalable way.
图 6.1. OLM (Classic) workflow
OLM runs by default in OpenShift Container Platform 4.21, which aids cluster administrators in installing, upgrading, and granting access to Operators running on their cluster. The OpenShift Container Platform web console provides management screens for cluster administrators to install Operators, as well as grant specific projects access to use the catalog of Operators available on the cluster.
For developers, a self-service experience allows provisioning and configuring instances of databases, monitoring, and big data services without having to be subject matter experts, because the Operator has that knowledge baked into it.
6.32.1. OLM Operator
The OLM Operator is responsible for deploying applications defined by CSV resources after the required resources specified in the CSV are present in the cluster.
The OLM Operator is not concerned with the creation of the required resources; you can choose to manually create these resources using the CLI or using the Catalog Operator. This separation of concern allows users incremental buy-in in terms of how much of the OLM framework they choose to leverage for their application.
The OLM Operator uses the following workflow:
- Watch for cluster service versions (CSVs) in a namespace and check that requirements are met.
If requirements are met, run the install strategy for the CSV.
注意A CSV must be an active member of an Operator group for the install strategy to run.
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