Prerequisites

Minimum hardware requirements:

256 MB of RAM

1 GB of drive space (although 10 GB is a recommended minimum if running Jenkins as a Docker container)

Recommended hardware configuration for a small team:

1 GB+ of RAM

50 GB+ of drive space

Sofware requirements:

Java 8 - either a Java Runtime Environment (JRE) or a Java Development Kit (JDK) is fine
Note: This is not a requirement if running Jenkins as a Docker container.

查看系统版本

[root@localhost logs]# uname -a
Linux localhost.localdomain 2.6.32-696.el6.i686 #1 SMP Tue Mar 21 18:53:30 UTC 2017 i686 i686 i386 GNU/Linux

[root@localhost logs]# getconf LONG_BIT
32

1、安装JDK运行环境

//下载JDK安装包（oracle官网下载最新jdk-8u162-linux-i586.tar.gz）

//解压JDK安装包
tar -zxvf jdk-8u162-linux-i586.tar.gz /usr/local/

//设置环境变量
vi /etc/profile
export JAVA_HOME=/usr/local/jdk1.8.0_162
export CLASSPATH=.:$JAVA_HOME/lib.tools.jar
export PATH=$JAVA_HOME/bin:$PATH

//更新环境变量
source /etc/profile

//检查java版本
[root@localhost ~]# java -version
java version "1.8.0_162"
Java(TM) SE Runtime Environment (build 1.8.0_162-b12)
Java HotSpot(TM) Server VM (build 25.162-b12, mixed mode)

2、安装Tomcat环境

//下载Tomcat安装包（apache官网下载最新apache-tomcat-9.0.6）

//解压Tomcat安装包
tar –zxvf apache-tomcat-9.0.6.tar.gz

//查看默认端口是否占用
netstat -antp

//修改Tomcat默认端口
vi /devops/apache-tomcat-9.0.6/conf/server.xml

#默认端口
<Connector port="8080" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />

#修改后端口
<Connector port="9080" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" /> 

//其他端口根据实际情况修改
//启动Tomcat服务
cd /devops/apache-tomcat-9.0.6/bin
./startup.sh start

//停止Tomcat服务
./startup.sh stop

//重启Tomcat服务
./startup.sh restart

3、部署Jenkins程序

//复制jenkins war包到Tomcat webapps目录

cp jenkins.war /devops/apache-tomcat-9.0.6/webapps

//Jenkins hash密码值

cat /root/.jenkins/secrets/initialAdminPassword