What is default administrator password for Tomcat?

When you want to deploy your application to tomcat server , you may do it using admin UI but how can you access it? Do you know default admin password?
Actually tomcat does not provide any default password. You need to add users to $TomcatHome/conf/tomcat-users.xml and provide role as manager-gui(For tomcat 7 and 8) and manager (For tomcat 6).

Default tomcat-users.xml

As you can see, there are no users defined in above xml.You can simply add user as below:

tomcat-users.xml

<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 required to 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 is strongly recommended that you do NOT use one of the users in the commented out section below since they are intended for use with the examples web application. --> <!-- NOTE: The sample user and role entries below are intended for use with the examples web application. They are wrapped in a comment and thus are ignored when reading this file. If you wish to configure these users for use with the examples web application, do not forget to remove the <!.. ..> that surrounds them. 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"/> --> <role rolename="manager-gui"/> <user username="arpit" password="arpit" roles="manager-gui"/> </tomcat-users>

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<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 required   to 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 is   strongly recommended that you do NOT use one of the users in the commented out   section below since they are intended for use with the examples web   application. --> <!--   NOTE:  The sample user and role entries below are intended for use with the   examples web application. They are wrapped in a comment and thus are ignored   when reading this file. If you wish to configure these users for use with the   examples web application, do not forget to remove the <!.. ..> that surrounds   them. 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"/> -->   <role rolename="manager-gui"/> <user username="arpit" password="arpit" roles="manager-gui"/> </tomcat-users>

You need to use role as manager-gui for tomcat 7, tomcat 8 and manager for tomcat 6