Centos 7 ；CRT 7
jdk安装：
1.打开官网http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
勾选Accept License Agreement
选择rpm安装包，右键，复制链接地址
2.下载rpm包到虚拟机
wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u161-b12/2f38c3b165be4555a1fa6e98c45e0808/jdk-8u161-linux-x64.rpm
3.在usr下面创建java文件夹，并把rpm包移到/usr/java
[root@localhost usr]#mkdir java
[root@localhost ~]#mv jdk-8u161-linux-x64.rpm /usr/java
4.安装jdk
cd /usr/java
yum install jdk-8u161-linux-x64.rpm
5.查看jdk版本信息
Jenkins安装
1.在usr/local下创建webserver文件夹，下载Jenkins war包到该目录下
wget http://mirrors.jenkins-ci.org/war/latest/jenkins.war
2.启动Jenkins
java -jar /usr/local/webserver/jenkins.war --httpPort=8080
备注：初始密码会打印在启动日志中，注意查看
3.启动成功：Jenkins is fully up and running
4.访问：http://服务器IP:8080/
备注：如果浏览器打不开可能是虚拟机防火墙没关，执行命令 service firewalld stop
