How to find server resources via ssh?

Question

SSH

What is the ssh command to find out the characteristics actually allocated to the server. Centos
means memory, cores, hard, etc.
The hoster only claims that it has 2 cores / 2 RAM, but it seems that the RAM is really less.
current panel vesta stands.

Answer 1

Small benchmark:

Answer 2

RAM: cat /proc/meminfo
CPU: cat /proc/cpuinfo
HDD: fdisk -l

Answer 3

Inxi presents extensive output in a more readable way than other utilities and has many options for grouping it. The package provides invaluable help when using console linux, including when connecting remotely through an ssh tunnel.
sudo yum install epel-release
sudo yum install inxi
How to use it is written here:
www.binarytides.com/inxi-system-information-linux