找到tomcat主目录下的子目录conf里面的tomcat-users.xml文件，
[corpwx@VM_0_17_centos conf]$ cat tomcat-users.xml
<?xml version="1.0" encoding="UTF-8"?>
<!--Licensed to the Apache Software Foundation (ASF) under one or morecontributor license agreements. See the NOTICE file distributed withthis work for additional information regarding copyright ownership.The ASF licenses this file to You under the Apache License, Version 2.0(the "License"); you may not use this file except in compliance withthe License. You may obtain a copy of the License athttp://www.apache.org/licenses/LICENSE-2.0Unless required by applicable law or agreed to in writing, softwaredistributed under the License is distributed on an "AS IS" BASIS,WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.See the License for the specific language governing permissions andlimitations under the License.
-->
<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">
<!--NOTE: By default, no user is included in the "manager-gui" role requiredto operate the "/manager/html" web application. If you wish to use this app,you must define such a user - the username and password are arbitrary. It isstrongly recommended that you do NOT use one of the users in the commented outsection below since they are intended for use with the examples webapplication.
-->
<!--NOTE: The sample user and role entries below are intended for use with theexamples web application. They are wrapped in a comment and thus are ignoredwhen reading this file. If you wish to configure these users for use with theexamples web application, do not forget to remove the <!.. ..> that surroundsthem. You will also need to set the passwords to something appropriate.
-->
<!--<role rolename="tomcat"/><role rolename="role1"/><user username="tomcat" password="<must-be-changed>" roles="tomcat"/><user username="both" password="<must-be-changed>" roles="tomcat,role1"/><user username="role1" password="<must-be-changed>" roles="role1"/>
-->
</tomcat-users>
默认是没有密码的，需要把
<user username="tomcat" password="<must-be-changed>" roles="tomcat"/>粘贴到
<tomcat-users>标签内，密码自己配置。