Flow Chat for troubleshooting Linux server performance and basic problems and possible solutions

Hi Friends,

To Resolve the performance issue in Linux server (Cent Os and Redhat 6.x) and some basic issue
we have to follow specific steps (or we can say a flow chat ).

example :-

So request all friends to add steps or any doc or flow char for following issue

  1. CPU related
  2. RAM
  3. Disk
  4. Network
  5. DNS
  6. Application related.