why my Cassandra exit automatically and not showing log?

[jumo77]

Cassandra exit automatically and can't see log.

Hi, I'm 3month docker user, and new to Cassandra.

I heard Cassandra is great NoSQL database for handling vast amounts of queries,
so I'm trying to run it on my ubuntu 20.04 server.

At first try, didn't wanted to use docker, and run it in my ubuntu server.
But couldn't run it on my server.

So I'm trying to run it by docker.
I used this script.

docker run --name cass_cluster cassandra:latest
docekr ps -a

And this came out.
5eed81eb133a cassandra:latest "docker-entrypoint.s…" 7 seconds ago Exited (137) 5 seconds ago cass_cluster

So I logged it, but nothing came out.

First thing first, there's NO PROBELM WITH DOCKER.
I'm running nginx, node.js, next.js.
Second, my ubuntu server is new. I RENT NEW SERVER FOR CASSANDRA.
It's 5$ for month, but what ever. I'm using clean, nothing existing server.
Nothing? Yes nothing.
Third, I tested rest of them. NGINX, NODE.JS WORKS FINE.
So I tried to log my cassandra cluster with
docker logs cass_cluster
Fourth, NO LOG CAME OUT.
This is the main reason I came up with.
NginX, Node.js worked just fine, but not in cassandra.

I need help. I'm literally begging for the reason.