1、下载Jenkinsyum源
wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat-stable/jenkins.repo
2、导入Jenkins
rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key
3、yum下载
yum -y install jenkins
4、添加jdk
oracle官网下载jdkhttps://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
5、解压jdk
tar xf jdk-8u211-linux-x64.tar.gz
6 、移动jdk至指定目录
mv jdk1.8.0_211 /usr/local/jdk1.8.0_211
7、配置环境变量：/etc/profile
export JAVA_HOME=/usr/local/jdk1.8.0_211
export JAVA_BIN=JAVA_HOME/lib
export CLASSPATH=.:JAVA_LIB/dt.jar
export PATH=PATH
8、启动Jenkins
service Jenkins start
8、通过web页面登录Jenkins
http://123.56.200.25:8080
安装后若出现找不到/usr/bin/java，解决如下：
1、修改etc/init.d/jenkins中以下段即可
candidates=" /usr/local/jdk1.8.0_211/bin/java 增加这一行
/etc/alternatives/java
2、vim /etc/sysconfig/ jenkins
JENKINS_JAVA_CMD="/usr/local/jdk1.8.0_211/bin/java"
安装后启动出现了jenkins dead but pid file exists错误，解决如下：
解决办法：
- lsof -i:8080
2.杀掉进程相关进程
kill -9 进程号
3.查看已安装的java
rpm -qa | grep java
4.卸载java
yum remove java*
5.安装java
yum install java-1.8.0-openjdk
6.启动jenkins
service jenkins start
7.查看jenkins状态
service jenkins status
jenkins (pid 20887) is running…
8.查看8080端口状态
lsof -i:8080
java 20887 jenkins 163u IPv6 80130 0t0 TCP *:webcache (LISTEN)
9.浏览器访问
服务器ip：8080 （默认）
管理员密码： cat /var/lib/jenkins/secrets/initialAdminPassword
安装插件：gitlab gitlabHook