Solaris 里reboot 与 init 6有什么不同?

lazyoracle

Solaris 里reboot 与 init 6有什么不同?

bloomit

From the user point of view, we may think that for solaris.

  init 6 = reboot

But it is not true.

there are two main difference between init 6 and /usr/sbin/reboot cmd:

1. /usr/sbin/reboot do not call the script in rc0 that execute the kill cmd.
2. /usr/sbin/reboot do not notified user while it is about to restart system.

I remerber that these things are explained in detail in SUN book SA238. Check it yourself and may you get more...

lazyoracle

Thanks for swift response. Would you mind let\'s go beyond SA238 a little bit?

Like you said, \'init 6\' calls any shutdown scripts (/etc/rc0.d/K*) to bring the system down sanely; \'reboot\' bypassses those. But I \'init 6\'  doesn\'t broadcast warning messages either. (that is why shutdown is recommended)

Actually  I am more interested in what happens exactly after shutting down the system. according to man, \'init 6\' stops OS then brings system to the state defined by initdefault entry in /etc/inittab; \'reboot\' simply performs a sync operation on disks then initiates a multi-user reboot.

I am wondering
1. do both commands bring the system down to firmware state (before starting up)?  I mean is it true that to the same extent both commands reset the system?

2. do both commands start the system up the same way?
I thought they are same, but recently I found when executing \'reboot\' those startup scripts in /etc/rc2.d are not performed. weird?

Thanks.

bloomit

You can reference SA 238 Chapter 13: System Boot Process

UNIX system is designed for continuous running, so there is a little complex to explain the boot process. In brief, as for my comprehension

最初由 lazyoracle 发布
[B]I am wondering
1. do both commands bring the system down to firmware state (before starting up)?  I mean is it true that to the same extent both commands reset the system?
[/B]

Yes

最初由 lazyoracle 发布
[B]2. do both commands start the system up the same way?
I thought they are same, but recently I found when executing 'reboot' those startup scripts in /etc/rc2.d are not performed. weird?
[/B]

[B]The reboot command performs an immediate shutdown and brings the system to run level 3 by default.[/B]

Look at this pic, you will get what you want.

lazyoracle

[B]The reboot command performs an immediate shutdown and brings the system to run level 3 by default.[/B]

Thanks again for coming back. This is just where I don\'t get it. Since \'reboot\' brings to run level 3, /sbin/rc2 and /sbin/rc3 will be called, /etc/rc2.d/* are supposed to be performed, right? but this did not happen to my box.

bloomit

最初由 lazyoracle 发布
[B]
Thanks again for coming back. This is just where I don\'t get it. Since \'reboot\' brings to run level 3, /sbin/rc2 and /sbin/rc3 will be called, /etc/rc2.d/* are supposed to be performed, right? but this did not happen to my box. [/B]

Startup scripts in /etc/rc3.d is for run level 3.

When you get into run level 3, all ther services in /etc/rc2.d and /etc/rc3.d are started.

for your problem, does all the script in rc2.d don\'t start or only some? just something related some specific script...

GOOD LUCK!