jenkins第一个pipeline

sudo wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat-stable/jenkins.repo
sudo rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key
sudo yum upgrade
sudo yum install jenkins

//清理yum缓存，如果安装不成功，下面命令可重复执行
sudo yum clean all
sudo yum -y remove jenkins
rm -rf /var/cache/jenkins
rm -rf /var/lib/jenkins/
sudo yum install jenkins