vps centos check cpu and memery usage

For memery use:

free -m

You will see an output like this:

total       used       free     shared    buffers     cached

Mem:           512        462         49          0         46        127

-/+ buffers/cache:        287        224

Swap:         2047          0       2047

The important figure to look at is the “used” number in the “buffers/cache” row. This will tell you how much memory your processes are currently using. Memory allocation errors will occur if this number is higher than the total amount of memory and swap space. To see how much RAM is free, check the “free” column in the “buffers/cache” row.

for running process check use:

ps aux

The output will look like this:
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  0.0  0.1  10368   632 ?        Ss   Jan07   0:00 init [3]
root         2  0.0  0.0      0     0 ?        S<   Jan07   0:00 [migration/0]
root         3  0.0  0.0      0     0 ?        SN   Jan07   0:00 [ksoftirqd/0]
One of the benefits of a VPS is that, in the case of a memory shortage, you can upgrade RAM on-the-fly with little (Xen) to no (OpenVZ) downtime. Open a support ticket, or find us on live chat, if you need an upgrade!
For active listening port:
netstat -ntplau
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