java -version

cd /opt
wget http://www.us.apache.org/dist/tomcat/tomcat-9/v9.0.0.M1/bin/apache-tomcat-9.0.0.M1.tar.gz
tar xzf apache-tomcat-9.0.0.M1.tar.gz
mv apache-tomcat-9.0.0.M1 tomcat9

echo "export CATALINA_HOME="/opt/tomcat9"" >> /etc/environment
echo "export JAVA_HOME="/usr/lib/jvm/java-8-oracle"" >> /etc/environment
echo "export JRE_HOME="/usr/lib/jvm/java-8-oracle/jre"" >> /etc/environment
source ~/.bashrc

sudo nano $CATALINA_BASE/conf/tomcat-users.xml

<!-- user manager can access only manager section -->
<role rolename="manager-gui" />
<user username="manager" password="_SECRET_PASSWORD_" roles="manager-gui" />

<!-- user admin can access manager and admin section both -->
<role rolename="admin-gui" />
<user username="admin" password="_SECRET_PASSWORD_" roles="manager-gui,admin-gui" />