Verifying the Runlevel

How to know the runlevel of the system?
command to know the runlevel :     who -r

run-level 3  2017-08-23

(we have to ON run-level 3)

Where we have to ON runlevel 3 on the system  or any runlevel to the system?

cat  /etc/inittab  > we have to vi  /etc/inittab and update the  id:3:initdefault:  ---> ` to make your system works on runlevel 3  `  .

id:3:initdefault:

Details:

0 – HALT (Shutdown).

1 - Single User.

2 – Multi-User (No Network or Remote Filesystem).

3 –is a typical system runlevel (Full Multi-user (Including Networking and Remote Filesystem).

4 – unused

5 – X11 (Full Multi-User with Graphical Desktop Environment).

6 – Reboot

How to ON  or verify runlevel for specific service ?
for example:

ftp server

Verify:

chkconfig  --list | grep ftp

run level 3 should be on (it means it(that specific ftp service) has to be start on boot time).

Note: If the run level 3 is not ON  for the ipsec,we need to add them.

This is how to on them:(for the specific service):
chkconfig --level 3 ftp on