root@xxxxx:/opt/apache-tomcat-8.5.15# ls conf/ -loa
total 236
drwx--x--x 3 tomcat   4096 Jun  1 08:18 .
drwxr-xr-x 9 tomcat   4096 Jun  1 08:30 ..
drwxr-x--- 3 tomcat   4096 Jun  1 08:18 Catalina
-rw------- 1 tomcat  12895 May  5 07:06 catalina.policy
-rw------- 1 tomcat   7376 May  5 07:06 catalina.properties
-rw------- 1 tomcat   1499 Jun  1 08:30 context.xml
-rw------- 1 tomcat   1149 May  5 07:06 jaspic-providers.xml
-rw------- 1 tomcat   2358 May  5 07:06 jaspic-providers.xsd
-rw------- 1 tomcat   3622 May  5 07:06 logging.properties
-rw------- 1 tomcat   8014 Jun  1 08:30 server.xml
-rw------- 1 tomcat   2260 Jun  1 08:50 tomcat-users.xml
-rw------- 1 tomcat   2633 May  5 07:06 tomcat-users.xsd
-rw------- 1 tomcat 168251 May  5 07:06 web.xml
root@xxxxx:/opt/apache-tomcat-8.5.15# 

<?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"/>
<user username="tomcat" password="s3cret" roles="manager-gui"/>

</tomcat-users>

root@xxxxx:/opt/apache-tomcat-8.5.15# ls conf/ -loa