System Admin Projects

System Administration Tips for Linux

Procedure for checking System, after login
check for suspicious activity when you login..

check the environment...
...]# set
show who is logged on and what they are doing...
...]# w
report process status -- make sure all needed processes are running (ex: apache, mysql, ssh)...
...]# ps -auxf
display used/free memory...
...]# free -m
display network interface information -- make sure your interfaces are up and running...
...]# ifconfig
show network connections -- see what ports your system is listening on and the programs behind those ports...
...]# netstat -ape
view logged activity...
...]# less /var/log/secure
view logged activity...
...]# less /var/log/messages
show listing of last logged in users...
...]# last
show log of login activity by user name...
...]# lastlog
list loaded modules...
...]# lsmod

Services

Killing processes

Changing Hostname

Update local host aliases