Webserver in this case means
PHP / MYSQL / Apache 2
You would need node.js based Web-Environment
./nodebb upgrade conducts an upgrade of your NodeBB installation. It is typically run after new code is checked out via git, or if your installation directory has been overwritten with a new version of NodeBB.
It does a number of things in sequence, but did you know you can also instruct the upgrader to run only a subset of those tasks?
Here are the options for
./nodebb upgrade [-mipsb] -m merge; merges the latest package.json from install/ into the root level package.json file -i install; runs the package manager installation (npm or yarn) -p plugins; checks the NodeBB package manager for new plugin versions and upgrades them as necessary -s schema; runs database schema upgrade scripts as necessary -b build; builds NodeBB assets
You are able to run any combination of those options, and running
./nodebb upgrade with no flags at all will execute all of the above tasks.
Cool and for context a link to the upgrade doc section - https://docs.nodebb.org/configuring/upgrade/