Tomcat – Can’t access Tomcat 6 Manager app

I tried out KiaMorot's answer with Tomcat 8.0.32, but it did not work. It did work when I added the option "-s 0" (salt lenth zero) when generating the digested password:

sudo /opt/apache-tomcat-8.0.32/bin/digest.sh -s 0 -a MD5 'developer:UserDatabase:my clear text password'

In this citation of my command I omitted my clear text password and replaced it with the string "my clear text password". Please keep the single quotes, otherwise the shell will interpret special characters in your password.

You can check whether omitting the -s option is your problem as follows. If I do the digest.sh command multiple times without the -s option, I get different results although the command-line of each repetition is the same.

I edited two files : server.xml & tomcat-users.xml

STEP 1 : I added this line to the server.xml, this line must be added under Engine context same as the picture:

<Realm className="org.apache.catalina.realm.MemoryRealm" />

here you can see the picture :

STEP 2 : then I edited tomcat-users.xml and added the lines below :

<!--
  NOTE:  The sample user and role entries below are wrapped in a 
  comment and thus are ignored when reading this file. Do not forget
  to remove <!.. ..> that surrounds them.
-->

  <role rolename="tomcat"/>
  <role rolename="role1"/>
  <role rolename="manager"/>
  <role rolename="manager-script"/>
  <role rolename="manager-gui"/>
  <user username="tomcat" password="tomcat" roles="tomcat"/>
  <user username="both" password="tomcat" roles="tomcat,role1"/>
  <user username="role1" password="tomcat" roles="role1"/>
  <user username="admin" password="tomcat" roles="manager-gui,manager-script "/> 

</tomcat-users>

NOTE : I recommend you to copy and paste my text and replace it by yours

Restart tomcat and you're ready to go !