How do I clear my Jenkins/Hudson build history?

Use the script console (Manage Jenkins > Script Console) and something like this script to bulk delete a job's build history https://github.com/jenkinsci/jenkins-scripts/blob/master/scriptler/bulkDeleteBuilds.groovy

That script assumes you want to only delete a range of builds. To delete all builds for a given job, use this (tested):

// change this variable to match the name of the job whose builds you want to delete
def jobName = "Your Job Name"
def job = Jenkins.instance.getItem(jobName)

job.getBuilds().each { it.delete() }
// uncomment these lines to reset the build number to 1:
//job.nextBuildNumber = 1
//job.save()

This answer is for Jenkins

1. Go to your Jenkins home page → Manage Jenkins → Script Console

   

2. Run the following script there. Change copy_folder to your project name

Code:

def jobName = "copy_folder"
def job = Jenkins.instance.getItem(jobName)
job.getBuilds().each { it.delete() }
job.nextBuildNumber = 1
job.save()

My post

If you click Manage Hudson / Reload Configuration From Disk, Hudson will reload all the build history data.

If the data on disk is messed up, you'll need to go to your %HUDSON_HOME%\jobs\<projectname> directory and restore the build directories as they're supposed to be. Then reload config data.

If you're simply asking how to remove all build history, you can just delete the builds one by one via the UI if there are just a few, or go to the %HUDSON_HOME%\jobs\<projectname> directory and delete all the subdirectories there -- they correspond to the builds. Afterwards restart the service for the changes to take effect.