1.jenkins安装

1、jenkins安装

# 导入镜像
wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat-stable/jenkins.repo

# 导入公钥
rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key

# 安装jenkins
yum install -y jenkins

2、修改配置文件

[root@centos7 ~]# vi /etc/sysconfig/jenkins

修改这部分：

## Default:     8080
## ServiceRestart: jenkins
#
# Port Jenkins is listening on.
# Set to -1 to disable
#
JENKINS_PORT="8091"

## Type:        string
## Default:     ""
## ServiceRestart: jenkins

3、启动jenkins

[root@iZ8vb41aj4ty78qk0yso8yZ conf.d]# 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.

4、查看jenkins的启动状态

[root@iZ8vb41aj4ty78qk0yso8yZ conf.d]# 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.
[root@iZ8vb41aj4ty78qk0yso8yZ conf.d]# systemctl status jenkins
● jenkins.service - LSB: Jenkins Automation Server
   Loaded: loaded (/etc/rc.d/init.d/jenkins; bad; vendor preset: disabled)
   Active: failed (Result: exit-code) since Mon 2021-03-15 16:00:27 CST; 27s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 21712 ExecStart=/etc/rc.d/init.d/jenkins start (code=exited, status=1/FAILURE)

Mar 15 16:00:27 iZ8vb41aj4ty78qk0yso8yZ systemd[1]: Starting LSB: Jenkins Automation Server...
Mar 15 16:00:27 iZ8vb41aj4ty78qk0yso8yZ runuser[21717]: pam_unix(runuser:session): session opened for user jenkins by (uid=0)
Mar 15 16:00:27 iZ8vb41aj4ty78qk0yso8yZ jenkins[21712]: Starting Jenkins bash: /usr/bin/java: No such file or directory
Mar 15 16:00:27 iZ8vb41aj4ty78qk0yso8yZ runuser[21717]: pam_unix(runuser:session): session closed for user jenkins
Mar 15 16:00:27 iZ8vb41aj4ty78qk0yso8yZ jenkins[21712]: [FAILED]
Mar 15 16:00:27 iZ8vb41aj4ty78qk0yso8yZ systemd[1]: jenkins.service: control process exited, code=exited status=1
Mar 15 16:00:27 iZ8vb41aj4ty78qk0yso8yZ systemd[1]: Failed to start LSB: Jenkins Automation Server.
Mar 15 16:00:27 iZ8vb41aj4ty78qk0yso8yZ systemd[1]: Unit jenkins.service enter

出现这种情况的解决办法是：
修改 jenkins 的配置文件中使用的 jdk 路径

[root@iZ8vb41aj4ty78qk0yso8yZ conf.d]# echo $JAVA_HOME
/usr/local/jdk1.8.0_201

[root@iZ8vb41aj4ty78qk0yso8yZ conf.d]# vi /etc/init.d/jenkins

注意：这里echo $JAVA_HOME 出来的路径，后面一定跟启动路径（/bin/java）

5、重启并查看 jenkins 状态

systemctl daemon-reload

systemctl restart jenkins