Tomcat 8.5之后无法进入管理页面

在使用Tomcat 8.5学习时，按照以往配置想进入管理页面，却出现如下问题：

You are not authorized to view this page.
By default the Host Manager is only accessible from a browser running on the same machine as Tomcat. If you wish to modify this restriction, you'll need to edit the Host Manager's context.xml file.
/application/tomcat/webapps/host-manager/META-INF/context.xml

经过百度，找到如下解决方案，亲测可行：
编辑/application/tomcat/webapps/manager/META-INF/context.xml和/application/tomcat/webapps/host-manager/META-INF/context.xml（/application/tomcat是tomcat程序的目录）这两个文件，将其中的这一行注释掉

<Valve className="org.apache.catalina.valves.RemoteAddrValve" allow="127\.\d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1" />

同时编辑 /application/tomcat/conf/tomcat-users.xml文件，设置用户名、密码

<role rolename="manager-gui"/>
<role rolename="admin-gui"/>
<user username="tomcat" password="tomcat" roles="manager-gui,admin-gui"/>

重启Tomcat即可。