Upgrading plugins using Plugin Manager
We'll upgrade our Jenkins using the first strategy. We are upgrading from one newish LTS version to the next LTS version, therefore we're not expecting any plugin version incompatibility issues. Even so, to minimize the possibility, let's upgrade all the plugins before upgrading the controller.
Log in to Jenkins as the admin
user, click Manage Jenkins, and then Manage Plugins. On the Updates tab, check all the boxes that are available for an upgrade. In Figure 8.4, notice that LDAP cannot be upgraded because version 2.4 is not compatible with the current version of Jenkins. But wait a minute. The current version of the LDAP plugin is 1.26, which is far back from 2.4. Would version 2.0, 2.1, 2.2, or 2.3 be compatible with the current Jenkins? How do we look up the version compatibility chart for older versions of a plugin?