jenkins - How to write Pipeline to discard old builds?

Question

The groovy syntax generator is NOT working for sample step properties: Set Job Properties. I've selected Discard old builds and then entered 10 in the Max # of builds to keep field and then Generate Groovy and nothing shows up.

Jenkins version: 2.7

Answer 1

As for declarative syntax, you can use the options block:

pipeline {
  options {
    buildDiscarder(logRotator(numToKeepStr: '30', artifactNumToKeepStr: '30'))
  }
  ...
}

Parameters for logRotator (from the source code):

• daysToKeepStr: history is only kept up to this days.
• numToKeepStr: only this number of build logs are kept.
• artifactDaysToKeepStr: artifacts are only kept up to this days.
• artifactNumToKeepStr: only this number of builds have their artifacts kept.

More information can be found in Cloudbees knowledge base and in the docs for options block.