How to deploy Spring Boot, JHipster app to tomcat 8 and redirect domain to this app

This is, how to do it on Ubuntu 16 on AWS EC2.

1. Install tomcat 8 - follow this: https://www.digitalocean.com/community/tutorials/how-to-install-apache-tomcat-8-on-ubuntu-16-04
2. In /opt/tomcat/webapps/ create myApp folder [assuming you have myApp.war file to deploy]
3. Redirect your domain to ip of your server.
4. Redirect port 8080 to 80:

   sudo iptables -A PREROUTING -t nat -p tcp --dport 80 -j REDIRECT --to-ports 8080
   

   And make it persistent:

   sudo apt-get install iptables-persistent
   

5. For now, copy to /opt/tomcat/webapps/myApp index.jsp from /opt/tomcat/webapps/ROOT.
6. Change ownership of /opt/tomcat/webapps/myApp and its content to tomcat
7. In /opt/tomcat/conf/server.xml, before </Engine> tag, add:

    <Host name="myApp.com" appBase="webapps" unpackWARs="false" autoDeploy="false">
   <Alias>www.myApp.com</Alias>
   <Context path="" docBase="/opt/tomcat/webapps/myApp" debug="0" privileged="true" />
   <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" 
   prefix="myApp_access_log." suffix=".txt" 
   pattern="%h %l %u %t &quot;%r&quot; %s %b" resolveHosts="false" />
   </Host>
   

8. sudo systemctl restart tomcat
9. Go to www.myApp.com and you should see tomcat home page, as it was copied in point 5.
10. Copy myApp.war to /opt/tomcat/webapps/ - it will override existing files and deploy your app

Points 5-10 are necessarily, because tomcat seeing your app in server.xml Host section, trying to redeploy it, causing hang.