How to: Setting update centers
During the download, the CLI will use update centers defined by the following environment variables:

- `JENKINS_UC` - Main update center.
  This update center may offer plugin versions depending on the Jenkins LTS Core versions.
  Default value: https://updates.jenkins.io
- `JENKINS_UC_EXPERIMENTAL` - [Experimental Update Center](https://jenkins.io/blog/2013/09/23/experimental-plugins-update-center/).
  This center offers Alpha and Beta versions of plugins.
  Default value: https://updates.jenkins.io/experimental
- `JENKINS_INCREMENTALS_REPO_MIRROR` -
  Defines Maven mirror to be used to download plugins from the
  [Incrementals repo](https://jenkins.io/blog/2018/05/15/incremental-deployment/).
  Default value: https://repo.jenkins-ci.org/incrementals
- `JENKINS_UC_DOWNLOAD` - Download url of the Update Center.
  Default value: `$JENKINS_UC/download`
- `JENKINS_PLUGIN_INFO` - Location of plugin information.
  Default value: https://updates.jenkins.io/current/plugin-versions.json

It is possible to override the environment variables in images.

:exclamation: Note that changing update center variables **will not** change the Update Center being used by Jenkins runtime, it concerns only the plugin manager CLI.