Port 5444 not available

Q - Is there any compatibility issue with RHEL9.3 ?
A - Since Vertica version 24.1 RHEL 9.x is supported.

Q - Also agent port 5444 is not showing with netstat -tupln command.
A - This will print the network connections only while Vertica database is up.
Your database is probably down.
Try this as Vertica super user (dbadmin) to check your DB state: admintools -t list_allnodes

Q - Why we see: /etc/init.d/vertica_agent: No such file or directory
A - Since 2015, the majority of Linux distributions have adopted systemd, having replaced other init systems such as SysV init.
As mentioned in /etc/init.d/README, on systemd-based OS traditional init scripts have been replaced by native systemd services files.
Try: systemctl status verticad
And: systemctl | grep -i vertica

Thanks Mosheg,

But we have installed older Vertica version 10.0.1-14 . since we are planning to do copy cluster from the existing vertica cluster which is using this older version.

Is this version is supported with RHEL 9.3?

All vertica nodes are UP, still port 5444 is not showing.

RHEL 9.3 is not supported with vertica 10.0.1-14. Where are you checking for port 5444?