Run level 확인
root@sanfran [/root]
# who -r
. run-level 3 Feb 25 11:48 3
0 S
run level 변경
root@sanfran [/root]
# init 2
root@sanfran [/root]
#
INIT: New run level: 2
/sbin/auto_parms: DHCP access is disabled
(see /etc/auto_parms.log)
logout root
Transition to run-level 2 in progress
_____________________________________
Transition to run-level 2 is complete.
Value of TERM has been set to
"vt100".
WARNING:
YOU ARE SUPERUSER !!
아래 서비스가 run level2에서는 없다.
root@sanfran [/root]
# ps -ef | grep dtrc
run level3 으로 가서 확인해보자
root@sanfran [/root]
# init 3
root@sanfran [/root]
#
INIT: New run level: 3
/sbin/auto_parms: DHCP access is disabled
(see /etc/auto_parms.log)
logout root
Transition to run-level 3 in progress
_____________________________________
Transition to run-level 3 is complete.
Value of TERM has been set to
"vt100".
WARNING:
YOU ARE SUPERUSER !!
root@sanfran [/root]
# ps -ef | grep dtrc
root 13328 1 0 10:03:14 ? 0:00 /sbin/sh /usr/dt/bin/dtrc
위와 같이 올라가 있는 서비스가 다름을 알 수 있다.
Runlevel(실행수준) 0~3
# who –r
# init
Run level 0 (=halt state)
-OS 모든 프로세스가 종료된 상태
-init 0 # shutdown –hy 0
-power on
Run level s (=single user mode)
-안전모드
-장애처리가 목적 최소한의 자원으로 부팅만!!
-/,/stand 만 마운트
-로그인과정 생략 à root passwd
분실
Run level 1(=single user mode)
-파일시스템 마운트(ß----/etc/fstab)
-hostname 설정
Run level 2(=multi user mode)
-network 설정(ip/netmask/gateway/dns)
버퍼에 내용을 디스크에 쓰기 (2~3회 실행 한번에 70%정도 수행하기 때문)
root@sanfran [/root]
# sync
현제 접속 상태
root@sanfran [/root]
# tty
/dev/console
runlevel 다르게 부팅하기
Press Any Key to interrupt Autoboot
\EFI\HPUX\AUTO ==> boot vmunix
Seconds left till autoboot - 10
Type 'help' for help
HPUX> boot vmunix –is (is or i1 or i2 or i3로 하면된다.)
INIT: Overriding default level with level
's'
INIT: SINGLE USER MODE
INIT: Running /sbin/sh
