Jenkins monitors executions of repeated jobs, such as building a software
project or jobs run by cron. Among those things, current Jenkins focuses on the
following two jobs:
1. Building/testing software projects continuously
2. Monitoring executions of externally-run jobs,


Groupname and Username

You must have the 'jenkins' group and user to run this script,
for example:

  groupadd -g 251 jenkins
  useradd -g 251 -u 251 -r -s /bin/bash -d /var/lib/jenkins jenkins