is there good instruction to add Lucee inside existing Tomcat? I fould only some outdated docs

It's really the same as any other JAVA app. Download the WAR file from the lucee site, add your CFML files, re-package the WAR then throw it in the webapps folder of your servelet.

First I went into 'install jar, configure web.xml' rabbit hole - it did not work. Deploying war gave same result at first try. Instead of Tomcat's hello screen - now 404 page 🙂 will recreated clean environment and try again.

Make sure you configure the web.conf to be the default context (/). Or, the webapp will, by default, deploy in a seprate context (a directory off your webroot).

Still playing around with it, cannot find the way to deploy WAR or JAR, probably this cloud provider has their PaaS offering with Tomcat pre-configured the way I cannot figure out myself. and it's not immediately compatible with Lucee. There's no shortage of cloud providers, I will probably just go with Digital Ocean and their plain Linux droplets, there's more freedom.

A default install of Tomcat will have you just drop the .WAR file into the %tomcat_install%\webapps directory. There is also the http://server/host-manager application that allows you to upload and deploy as well (if you have a login/password setup to it)

yep, absense of Manager app was a red flag that I ignored 🙂 something is not right, war file was not unwar-ed too 🙂 that's how cloud provider configured it, no option to change, but I rather will go with plain Linux