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The virtual webservers are configured using puppet by this file: https://github.com/apache/infrastructure-p6/blob/production/data/nodes/netbeans-vm1.apache.org.yaml (note that this is a private github repository for ASF committers). All ASF committers can pull from the repository, make modifications, push these modifications into a branch of the repository and create PRs from that (the repository can not be forked!). The PRs then need to be merged by a member of the infrastructure team. Depending on the intended change, this can be easier, than explaining the change that is intendend in an issue.