+
+A sample of jjb config file located at `~/.config/jenkins_jobs/jenkins_jobs.ini`
+```
+[job_builder]
+ignore_cache=True
+keep_descriptions=False
+recursive=True
+retain_anchors=True
+update=jobs
+
+[jenkins]
+user=admin
+password=admin
+url=http://localhost:8080
+```
+
+4. There is [a bug](https://issues.jenkins-ci.org/browse/JENKINS-28466) of jenkins
+which makes some environemtn variables not usable. To fix the bug, we need 'Manage Jenkins' > 'Configure System' > 'click save without any changes'.