Tomcat, by default runs on port 8080. You may want to make it run on port 80. Changing the port to 80 in the tomcat configurations wont work as port 80 is a privileged port and needs user with admin/root privileges. Making tomcat run as a root user is a big no no as well, as it could compromise your tomcat installation. The best solution to make tomcat work on port 80 is to do a port redirect using iptables.
Port redirect: 80 => 8080
Here is a two liner solution to enable port redirection from port 80 to 8080 on a linux server
iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 8080 iptables -t nat -A OUTPUT -p tcp --dport 80 -j REDIRECT --to-ports 8080
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