Recently I am busy,and haven't time to write something.I always want to learn some new knowledge.But I can slove it by search on internet when i happen to troubles.Maybe someone already think the problem is so easy. Does anyone master grow from a primary.

1、watch your boot level


#runlevel

this result will display a runlevel,if it return 2 means configration in /etc/rc2.d


2、check your boot service.

ls /etc/rc2.d/


display all boot service on runlevel 2


3、if you want  some services don't start  when opening.you use this command.

update-rc.d

214139188.png

4、only don't start on runlevel 2

sudo mv S20postfix K20postfix


5、add a service on some runlevel


ln -s postfix /etc/rc2.d/S20postfix