jenkins的安装

解决CentOS7.6上Jenkins安装及启动问题

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在CentOS7.6系统中安装Jenkins2.346.1(LTS)时，遇到准备就绪问题和端口冲突。解决方法包括：1)修改`hudson.model.UpdateCenter.xml`文件中的更新中心URL为清华大学开源软件镜像站；2)更改Jenkins服务配置文件中的默认端口以避免端口占用问题。

当前环境centos7.6

java JDK 1.8

jenkins版本：2.346.1（Long Term Support (LTS) Release Line）

注意点：jenkins和javaJDK版本有对应关系，否则安装不成功

rpm包下载：Index of /jenkins/redhat-stable/ | 清华大学开源软件镜像站 | Tsinghua Open Source Mirror

安装过程中出现：

问题1：一直出现Please wait while Jenkins is getting ready to work

解决方法: 找到jenkins工作目录，打开文件hudson.model.UpdateCenter.xml，把url修改为https://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/update-center.json

[root@study ~]# find / -name *.UpdateCenter.xml
/var/lib/jenkins/hudson.model.UpdateCenter.xml
[root@study ~]# vim /var/lib/jenkins/hudson.model.UpdateCenter.xml

<?xml version='1.1' encoding='UTF-8'?>
<sites>
  <site>
    <id>default</id>
    <url>https://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/update-center.json</url>
  </site>
</sites>

问题2：安装过程中出现端口号被占用：Caused: java.io.IOException: Failed to bind to 0.0.0.0/0.0.0.0:8080，需要更换端口号

解决方法：将8080端口改成其他未占用的端口号xxxx，依次执行如下2步：

a、修改vi /usr/lib/systemd/system/jenkins.service中端口号为xxxx，例如Environment="JENKINS_PORT=xxxx"

b、执行systemctl daemon-reload后，执行systemctl restart jenkins

Jan 02 23:35:22 study.centos.vbird jenkins[30692]: Caused: java.io.IOException: Failed to bind to 0.0.0.0/0.0.0.0:8080
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at org.eclipse.jetty.server.ServerConnector.openAcceptChannel(ServerConnector.java:349)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:310)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at org.eclipse.jetty.server.AbstractNetworkConnector.doStart(AbstractNetworkConnector.java:80)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at org.eclipse.jetty.server.ServerConnector.doStart(ServerConnector.java:234)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at org.eclipse.jetty.server.Server.doStart(Server.java:401)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at winstone.Launcher.<init>(Launcher.java:202)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: Caused: java.io.IOException: Failed to start Jetty
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at winstone.Launcher.<init>(Launcher.java:206)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at winstone.Launcher.main(Launcher.java:405)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at java.lang.reflect.Method.invoke(Method.java:498)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at Main._main(Main.java:342)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at Main.main(Main.java:117)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: java.lang.NoClassDefFoundError: hudson/util/HudsonFailedToLoad
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at hudson.WebAppMain$3.run(WebAppMain.java:261)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: Caused by: java.lang.ClassNotFoundException: hudson.util.HudsonFailedToLoad
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:538)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
Jan 02 23:35:22 study.centos.vbird jenkins[30692]: ... 1 more
Jan 02 23:35:22 study.centos.vbird systemd[1]: jenkins.service: main process exited, code=exited, status=1/FAILURE
Jan 02 23:35:22 study.centos.vbird systemd[1]: Failed to start Jenkins Continuous Integration Server.