目录

官网安装方法

安装java，**注意java版本，新版本jenkins只支持jdk11及以上

安装jenkins

Jenkins启动失败的七个问题

jenkins 部署脚本

Nginx转发jenkins服务

官网安装方法

Redhat Jenkins Packages (jenkins-ci.org)https://mirrors.jenkins-ci.org/redhat/

安装java，**注意java版本，新版本jenkins只支持jdk11及以上

1、查看本机是否自带java：rpm -qa|grep java

2、有则卸载：rpm -e --nodeps java*

3、查看yum中jdk版本：yum search jdk

发现有java11，列出java11：yum list |grep java-11

看到有文档、源码这些包，没必要安装，所以安装开头的那三个就可以了。

yum install -y java-11-openjdk-headless-11.0.5.10-0.el7_7.x86_64 java-11-openjdk-11.0.5.10-0.el7_7.x86_64 java-11-openjdk-devel-11.0.5.10-0.el7_7.x86_64

可能各个centos版本的jdk版本不一样，输入完yum install -y后挨个用鼠标选择包名后按shift+ins键就可以复制到命令行了，避免手打打错字。

5、安装完成直接java -version就可以出现版本信息。

6、配置环境变量

安装完之后，默认的安装目录是在: /usr/lib/jvm/

跟java8比，已经没有了dt.jar和tools.jar了，并且去看安装位置的jre，发现有一个已经指向了jdk文件夹（懵逼脸）。

在profile文件中添加如下内容

#set java environment
JAVA_HOME=/usr/lib/jvm/java-11-openjdk-11.0.5.10-0.el7_7.x86_64
JRE_HOME=$JAVA_HOME
CLASS_PATH=.:$JRE_HOME/lib
PATH=$PATH:$JAVA_HOME/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH

让修改生效：source /etc/profile

安装jenkins

sudo wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat-stable/jenkins.repo
sudo rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key
sudo yum upgrade

yum install fontconfig java-11-openjdk  
yum install jenkins

 说明：默认安装目录

Jenkins启动失败的七个问题

1、jdk版本和路径问题（注意第6个问题）

which java

 vim /etc/init.d/jenkins

2、用户名问题

查看/etc/sysconfig/jenkins的JENKINS_USER="root"，如果不是root，而是jenkins或者其它，要改成root。或者相反操作。

或者/usr/lib/systemd/system/jenkins.service的，同上处理。

老版本：

        vim /etc/sysconfig/jenkins

        systemctl daemon-reload

新版本：

        vim /usr/lib/systemd/system/jenkins.service

        User=root   

        Group=root

systemctl daemon-reload

3、log权限问题

 cd /var/log

chmod 777 -R jenkins/

4、启动方法问题（如果是CS9，则需要执行第一步）

cp /etc/rc.d/init.d/functions /etc/init.d/

cd /etc/init.d/

./jenkins status

./jenkins stop

./jenkins start

5、卸载jenkins

yum remove jenkins

rm -rf /etc/sysconfig/jenkins.rpmsave

rm -rf /var/cache/jenkins/

rm -rf /etc/init.d/jenkins.rpmsave

 6、无法使用systemctl启动jenkins

 vim /usr/lib/systemd/system/jenkins.service

修改上图为：

Environment="JAVA_HOME=/usr/java/jdk-17.0.4"

其中/usr/java/jdk-17.0.4为使用which java命令得到的路径。

systemctl daemon-reload

systemctl enable jenkins

7、端口占用，可能需要修改端口（修改前kill所有jenkins进程）

查看/etc/sysconfig/jenkins的JENKINS_PORT="8086"

或者/usr/lib/systemd/system/jenkins.service的Environment="JENKINS_PORT=8086"

老版本：

vim /etc/sysconfig/jenkins

systemctl daemon-reload

新版本：

vim /usr/lib/systemd/system/jenkins.service

systemctl daemon-reload

systemctl start jenkins.service

systemctl stop jenkins.service

systemctl status jenkins.service

netstat -ntap | grep 8086

jenkins 部署脚本

 方式二：日志会在 jenkins 任务里

Nginx转发jenkins服务

upstream jenkins {
  keepalive 32; # keepalive connections
  server 127.0.0.1:8080; # jenkins ip and port
}

# Required for Jenkins websocket agents
map $http_upgrade $connection_upgrade {
  default upgrade;
  '' close;
}

server {
  listen   80;       # Listen on port 80 for IPv4 requests
  server_name   ;  # replace 'jenkins.example.com' with your server domain name
  # this is the jenkins web root directory
  # (mentioned in the /etc/default/jenkins file)
  root            /var/run/jenkins/war/;

  access_log      /var/log/nginx/jenkins.access.log;
  error_log       /var/log/nginx/jenkins.error.log;

  # pass through headers from Jenkins that Nginx considers invalid
  ignore_invalid_headers off;

  location ~ "^/static/[0-9a-fA-F]{8}/(.*)$" {
    # rewrite all static files into requests to the root
    # E.g /static/12345678/css/something.css will become /css/something.css
    rewrite "^/static/[0-9a-fA-F]{8}/(.*)" /$1 last;
  }

  location /userContent {
    # have nginx handle all the static requests to userContent folder
    # note : This is the $JENKINS_HOME dir
    root /var/lib/jenkins/;
    if (!-f $request_filename){
      # this file does not exist, might be a directory or a /**view** url
      rewrite (.*) /$1 last;
      break;
    }
    sendfile on;
  }

  location / {
      sendfile off;
      proxy_pass         http://jenkins;
      proxy_redirect     default;
      proxy_http_version 1.1;

      # Required for Jenkins websocket agents
      proxy_set_header   Connection        $connection_upgrade;
      proxy_set_header   Upgrade           $http_upgrade;

      proxy_set_header   Host              $host;
      proxy_set_header   X-Real-IP         $remote_addr;
      proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
      proxy_set_header   X-Forwarded-Proto $scheme;
      proxy_max_temp_file_size 0;

      #this is the maximum upload size
      client_max_body_size       10m;
      client_body_buffer_size    128k;

      proxy_connect_timeout      90;
      proxy_send_timeout         90;
      proxy_read_timeout         90;
      proxy_buffering            off;
      proxy_request_buffering    off; # Required for HTTP CLI commands
      proxy_set_header Connection ""; # Clear for keepalive
  }

}