设置 JENKINS_HOME 参数有三种方式(参见 Jenkins Wiki):

There are three ways to set the JENKINS_HOME parameter (cf. Jenkins Wiki):

• 作为系统环境变量，
• 作为系统属性，
• 作为 JNDI 环境条目.

• as a system environment variable,
• as a system property,
• as a JNDI environment entry.

前两个选项将适用于整个Tomcat服务器，因此需要使用JNDI.创建一个描述符文件 $CATALINA_BASE/conf/Catalina/localhost/jen-dev.xml 内容:

The first two options will apply to the entire Tomcat server, so you need to use JNDI. Create a descriptor file $CATALINA_BASE/conf/Catalina/localhost/jen-dev.xml with content:

<Context>
    <Environment type="java.lang.String" override="false"
                 name="JENKINS_HOME" value="/opt/jen-dev" />
</Context>

并为另一个 Jenkins 实例定义一个类似的描述符.

and define a similar descriptor for the other Jenkins instance.