（1）查看war包所在的目錄
[root@linux-node2 ~]# rpm -ql jenkins
/etc/init.d/jenkins
/etc/logrotate.d/jenkins
/etc/sysconfig/jenkins
/usr/lib/jenkins
/usr/lib/jenkins/jenkins.war
/usr/sbin/rcjenkins
/var/cache/jenkins
/var/lib/jenkins
/var/log/jenkins

（2）下載最新穩定版的war包
[root@linux-node2 ~]# wget https://mirrors.tuna.tsinghua.edu.cn/jenkins/war/2.46/jenkins.war
--2017-12-21 14:56:10--  https://mirrors.tuna.tsinghua.edu.cn/jenkins/war/2.46/jenkins.war
Resolving mirrors.tuna.tsinghua.edu.cn (mirrors.tuna.tsinghua.edu.cn)... 101.6.6.178, 2402:f000:1:416:101:6:6:177
Connecting to mirrors.tuna.tsinghua.edu.cn (mirrors.tuna.tsinghua.edu.cn)|101.6.6.178|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 68663046 (65M) [application/java-archive]
Saving to: ‘jenkins.war’

36% [====================================================>                                                                                               ] 24,829,614   707KB/s  eta 60s

當前jenkins版本為2.32.2

（3）停止jenkins服務
[root@linux-node2 ~]# service jenkins stop
Stopping jenkins (via systemctl):                          [  OK  ]

（4）備份原來的war包，並拷貝最新版本war包到/usr/lib/jenkins目錄下
[root@linux-node2 ~]# cd /usr/lib/jenkins/
[root@linux-node2 jenkins]# mv jenkins.war jenkins-2.32.2.war.bak
[root@linux-node2 jenkins]# mv /root/jenkins.war .
[root@linux-node2 jenkins]# service jenkins start
Starting jenkins (via systemctl):                          [  OK  ]
[root@linux-node2 jenkins]# netstat -tulnp |grep 8080
tcp6       0      0 :::8080                 :::*                    LISTEN      47298/java   

成功升級到jenkins 2.46版本

2.jenkins備份

在jenkins界面創建一些項目，這裏使用rsync，主要是為了保持備份的屬性，如果使用scp或cp有時會導致文件屬性的改變而導致jenkins異常。

（1）創建備份目錄
[root@linux-node2 ~]# mkdir /data/backup/jenkins -p

（2）備份/var/lib/jenkins目錄
[root@linux-node2 ~]# rsync -raz --delete --progress /var/lib/jenkins /data/backup/jenkins/

（3）刪除/var/lib/jenkins/
[root@linux-node2 ~]# rm -rf /var/lib/jenkins/

[root@linux-node2 ~]# service jenkins restart
Restarting jenkins (via systemctl):  Job for jenkins.service failed because the control process exited with error code. See "systemctl status jenkins.service" and "journalctl -xe" for details.
                                                           [FAILED]
[root@linux-node2 ~]# service jenkins status
JENKINS_HOME directory does not exist: /var/lib/jenkins

（4）恢復備份
[root@linux-node2 ~]# rsync -raz --delete /data/backup/jenkins/jenkins /var/lib/
[root@linux-node2 ~]# service jenkins restart
Restarting jenkins (via systemctl):                        [  OK  ]

自動化部署之jenkins升級和備份