Monitoring Linux

Monitoring a Linux System

·       Search the boot log to see all the section where the network interface has been mentioned

dmesg | grep eth0                  

dmesg | grep network | grep interface

·       Find out what is the cache size of your PC’s processor

vmstat     (or hwinfo)   

·       Find out the IRQ number associated with the interrupts generated by your Ethernet card

dmesg | grep irq

·       Find out the PCI Bus IDs of the USB Controllers on your PC

lspci

·       Start the ssh service on your PC and establish a local connection to it by using ssh username@localhost

o   Use netstat to find out the process ids of all TCP connections established on your machine

sudo apt-get install ssh;

sudo /etc/init.d/ssh start   or sudo service ssh start;

netstat

·       Which version of Linux kernel is currently installed on your system?

uname -mrs (-a all)

·       Show the duration of last 5 logins at your system

last -5