Fix the Jenkins error: Invalid agent type Docker specified [any, label, none]

Jenkins Docker error: Invalid agent type

If you’re Jenkins Docker build jobs are failing with the following error, don’t fret, as there’s a simple fix.

Invalid agent type "docker" specified. Must be one of [any, label, none].

If you’ve hit this error, you likely have a Jenkinsfile that references a Docker container, but you haven’t installed either the Jenkins Docker plugin, or the Jenkins Docker Pipeline plugin. Just add those two Jenkins plugins and the Docker error will go away.

Quickly fix the Jenkins Docker invalid agent type error by installing the right plugins.