PS:
搭建测试环境的时候开启管理端进行测试 开启管理端
生产环境中 关闭管理端

cat conf/tomcat-users.xml 
<?xml version="1.0" encoding="UTF-8"?>
<tomcat-users xmlns="http://tomcat.apache.org/xml"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="http://tomcat.apache.org/xml tomcat-users.xsd"
              version="1.0">
  <role rolename="manager-gui"/>
  <role rolename="admin-gui"/>
  <user username="tomcat" password="tomcat" roles="manager-gui,admin-gui"/>
</tomcat-users>

重启
./bin/shutdown.sh
./bin/startup.sh

8.5之后版本修改

[root@RainGod tomcat]# vim webapps/host-manager/META-INF/context.xml 
[root@RainGod tomcat]# vim webapps/manager/META-INF/context.xml 
127 替换为 \d+\