CentOs8 安装 Jenkins 总结

一、版本&安装

# 所选版本
jdk-8u361-linux-x64.rpm
jenkins-2.164.1-1.1.noarch.rpm

rpm -ivh *

二、Jenkins配置

1. 配置 Java 路径

在 /etc/rc.d/init.d/jenkins/candidates 中可以看到安装的Jenkins适配什么Java版本，比如能看出来我安装的 Jenkins 适配 Java1.7 和 Java1.8

vim /etc/rc.d/init.d/jenkins

# 找到如下部分，修改 Java 路径，注释掉其他
# 通过命令 which Java 查看 Java 路径
candidates="
#/etc/alternatives/java
#/usr/lib/jvm/java-1.8.0/bin/java
#/usr/lib/jvm/jre-1.8.0/bin/java
#/usr/lib/jvm/java-1.7.0/bin/java
#/usr/lib/jvm/jre-1.7.0/bin/java
/usr/bin/java
"

2. 配置用户名称(一定要改成root！！！)

用户默认是 Jenkins ，将 JENKINS_USER 的值改成root，如果不是 root 就会启动失败；我一开始用的admin，在启动环节疯狂报错

vim /etc/sysconfig/jenkins

# 只改 JENKINS_USER
JENKINS_HOME="/var/lib/jenkins"
JENKINS_JAVA_CMD=""
JENKINS_USER="root"
JENKINS_JAVA_OPTIONS="-Djava.awt.headless=true"
JENKINS_PORT="8080"
JENKINS_LISTEN_ADDRESS=""
JENKINS_HTTPS_PORT=""
JENKINS_HTTPS_KEYSTORE=""
JENKINS_HTTPS_KEYSTORE_PASSWORD=""
JENKINS_HTTPS_LISTEN_ADDRESS=""
JENKINS_DEBUG_LEVEL="5"
JENKINS_ENABLE_ACCESS_LOG="no"
JENKINS_HANDLER_MAX="100"
JENKINS_HANDLER_IDLE="20"
JENKINS_ARGS=""

3. 启动 &停止& 重启 Jenkins 命令

1. 启动

systemctl start jenkins

2. 停止

systemctl stop jenkins

3. 重启

systemctl restart jenkins

三、成功

启动后访问IP:8080

四、问题记录

1. 版本过高

All illegal access operations will be denied in a future release

启动后出现Java非法访问，我用的Java11出现，降低版本后错误改变，如有知晓解决，望留言，还请不吝赐教

2. 删除Jenkins

systemctl stop jenkins.service
rpm -e jenkins
rpm -qa | grep jenkins      # 查看是否还有jenkins依赖，有就删除
rm -rf /etc/sysconfig/jenkins.rpmsave
rm -rf /var/cache/jenkins/
rm -rf /var/lib/jenkins/
rm -rf /var/log/jenkins
rm -rf /usr/lib/jenkins

3. 删除Java

# 查看系统中默认安装的jdk：
rpm -qa|grep jdk
yum -y remove java-11-openjdk*

4. Jenkins用户名没有用root

# 启动报错
[root@test ~]# systemctl start jenkins
Job for jenkins.service failed because the control process exited with error code.
See "systemctl status jenkins.service" and "journalctl -xe" for details.

# 查看具体报错内容
[root@test ~]# systemctl status jenkins.service
● jenkins.service - LSB: Jenkins Automation Server
   Loaded: loaded (/etc/rc.d/init.d/jenkins; generated)
   Active: failed (Result: exit-code) since Fri 2023-02-24 00:32:56 CST; 37s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 1926718 ExecStart=/etc/rc.d/init.d/jenkins start (code=exited, status=1/FAILURE)
 Main PID: 1921125 (code=exited, status=1/FAILURE)

Feb 24 00:32:56 test systemd[1]: Starting LSB: Jenkins Automation Server...
Feb 24 00:32:56 test jenkins[1926718]: Starting Jenkins runuser: user admin does not exist
Feb 24 00:32:56 test jenkins[1926718]: [FAILED]
Feb 24 00:32:56 test systemd[1]: jenkins.service: Control process exited, code=exited stat>
Feb 24 00:32:56 test systemd[1]: jenkins.service: Failed with result 'exit-code'.
Feb 24 00:32:56 test systemd[1]: Failed to start LSB: Jenkins Automation Server.
lines 1-13/13 (END)...skipping...
● jenkins.service - LSB: Jenkins Automation Server
   Loaded: loaded (/etc/rc.d/init.d/jenkins; generated)
   Active: failed (Result: exit-code) since Fri 2023-02-24 00:32:56 CST; 37s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 1926718 ExecStart=/etc/rc.d/init.d/jenkins start (code=exited, status=1/FAILURE)
 Main PID: 1921125 (code=exited, status=1/FAILURE)

Feb 24 00:32:56 test systemd[1]: Starting LSB: Jenkins Automation Server...
Feb 24 00:32:56 test jenkins[1926718]: Starting Jenkins runuser: user admin does not exist
Feb 24 00:32:56 test jenkins[1926718]: [FAILED]
Feb 24 00:32:56 test systemd[1]: jenkins.service: Control process exited, code=exited status=1
Feb 24 00:32:56 test systemd[1]: jenkins.service: Failed with result 'exit-code'.
Feb 24 00:32:56 test systemd[1]: Failed to start LSB: Jenkins Automation Server.

将用户名改成 root 解决

# 成功启动
[root@test ~]# systemctl status jenkins.service
● jenkins.service - LSB: Jenkins Automation Server
   Loaded: loaded (/etc/rc.d/init.d/jenkins; generated)
   Active: active (exited) since Fri 2023-02-24 09:45:20 CST; 24s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 2006574 ExecStop=/etc/rc.d/init.d/jenkins stop (code=exited, status=0/SUCCESS)
  Process: 2006588 ExecStart=/etc/rc.d/init.d/jenkins start (code=exited, status=0/SUCCESS)
 Main PID: 1921125 (code=exited, status=1/FAILURE)

Feb 24 09:45:20 test systemd[1]: jenkins.service: Succeeded.
Feb 24 09:45:20 test systemd[1]: Stopped LSB: Jenkins Automation Server.
Feb 24 09:45:20 test systemd[1]: Starting LSB: Jenkins Automation Server...
Feb 24 09:45:20 test runuser[2006595]: pam_unix(runuser:session): session opened for user root by (uid=0)
Feb 24 09:45:20 test runuser[2006595]: pam_unix(runuser:session): session closed for user root
Feb 24 09:45:20 test jenkins[2006588]: Starting Jenkins [  OK  ]
Feb 24 09:45:20 test systemd[1]: Started LSB: Jenkins Automation Server.

5. Jenkins启动成功后，网页依然无法访问

可以说这是我遇见的最后一个坑了，您猜怎么着，在腾讯云防火墙加一下8080的规则就好了；以后一定记得维护安全组的端口

五、疑问

经过很久的折腾，我在想一个问题，如果一开始我用 root 当用户名，即使用的 Java11 以及最新版 Jenkins，启动时出现 Java 的非法访问警告，是否也能正常启动 Jenkins ？可惜我没有机器再让我尝试了，将这个疑问留存，下次我去尝试一下。有读者知道问题所在，还请您不吝赐教。