Can multiple tomcat, on a single server be configured with nginx load balancer to increase the concurrency of the website?

at present, I have a website with both static and dynamic interfaces. I wonder if I can build a tomcat cluster on a server and then use nginx to configure load balancers. Can I increase the number of concurrency of this website?
Server environment: general ubuntu, configuration, 4G memory, 1T hard disk, low bandwidth.
if concurrency can be increased, why can it be increased?
if you can"t increase concurrency, why not? The details of the principle are not clear.

Linux-operation-and-maintenance load-balancing nginx java tomcat

Mar.10,2021

cannot in most cases. No one can explain the principle clearly. This is the result of the test.

the fundamental reason for determining concurrency is database access. Secondly, the amount of concurrency that a server can carry is not determined by software, but depends on hardware performance

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b37ed6-2c0b5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b37ed6-2c0b5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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