一、安装java环境

yum install -y java-11-openjdk*

 三、将Jenkins存储库添加到yum repos

wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat-stable/jenkins.repo --no-check-certificate
rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key

 四、安装配置Jenkins

#安装jenkins
yum install -y jenkins

 修改配置文件

vim /etc/sysconfig/jenkins
JENKINS_USER="root"
JENKINS_PORT="8888"

 五、启动Jenkins

systemctl  start jenkins

 启动失败，jerkins服务启动时间较长，超过了一定时间就会被systemd认定启动失败，可以通过修改/usr/lib/systemd/system/jenkins.service文件

vim /usr/lib/systemd/system/jenkins.service
# 修改TimeoutStartSec=0
systemctl daemon-reload
systemctl start jenkins

 六、访问页面

 页面无法正常访问

netstat -nltp 查看修改的端口发现没有生效，没有监听8888端口

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