Kubernetes lifecycle management

Kubernetes lifecycle management

The Kubernetes lifecycle management (LCM) engine in Docker Enterprise (DE) Container Cloud consists of the following components:

LCM controller

Responsible for all LCM operations. Consumes the LCMCluster object and orchestrates actions through LCM agent.

LCM agent

Relates only to UCP clusters deployed using DE Container Cloud, and is not used for attached UCP clusters. Runs on the target host. Executes Ansible playbooks in headless mode.

Helm controller

Responsible for the lifecycle of the Helm charts. It is installed by LCM controller and interacts with Tiller.

The Kubernetes LCM components handle the following custom resources:

  • LCMCluster

  • LCMMachine

  • HelmBundle

The following diagram illustrates handling of the LCM custom resources by the Kubernetes LCM components. On a managed cluster, apiserver handles multiple Kubernetes objects, for example, deployments, nodes, RBAC, and so on.