启动及升级
升级：http://updates.jenkins-ci.org/download/war/
启动：
su - jenkins -c '/usr/local/java/jdk1.8.0_212/bin/java -Djava.awt.headless=true -DJENKINS_HOME=/var/lib/jenkins -jar /usr/lib/jenkins/jenkins.war --logfile=/var/log/jenkins/jenkins.log --webroot=/var/cache/jenkins/war --httpPort=8080 --debug=5 --handlerCountMax=100 --handlerCountMaxIdle=20'示例：
nohup /usr/local/java/jdk1.8.0_231/bin/java -Djava.awt.headless=true -DJENKINS_HOME=/data/jenkins -jar /usr/local/jenkins/jenkins.war --logfile=/usr/local/jenkins/jenkins.log --webroot=/usr/local/jenkins/war --httpPort=88 --debug=5 --handlerCountMax=100 --handlerCountMaxIdle=20 &导出导入job
导出job：Jenkins的job都在$JENKINS_HOME/jobs目录（一般是/var/lib/jenkins/jobs）下，每个job一个目录
导入job：在目标Jenkins上，打开Manage Jenkins，选择Reload Configuration from Disk
