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Full Discussion: Rsh reboot in a loop?
Top Forums Shell Programming and Scripting Rsh reboot in a loop? Post 303026128 by MuntyScrunt on Tuesday 20th of November 2018 01:52:39 PM
Old 11-20-2018
Rsh reboot in a loop?
Hi folks. I'm trying to get the following script working for rebooting a bunch of clients. Up to now I've been using PSSH, but when they all startup again at the same time I get a few mount problems. So, I'm trying to stagger the reboot command. I know reboot will depend on what's running at the time. According to everything I've found the code attached should work.

But this script exits after the first iteration. I'm guessing the rsh command loses connection without getting a return so it produces an error "closed by remote host" which isn't getting caught

Could someone please help me out, this is starting to drive me nuts! I could do the same in python, but then I'm not learning anything.

Thanks.


Code:
#!/bin/bash
set +e

cat /nodes/nodes-128 | while read LINE; do
        echo "Attempting to reset - $LINE"
        rsh pi@$LINE sudo reboot now || true
        sleep .5
done

 

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LEARN ABOUT SUNOS

reboot

reboot(3C)																reboot(3C)

NAME

       reboot - reboot system or halt processor

SYNOPSIS

       #include <sys/reboot.h>

       int reboot(int howto, char *bootargs);

       The  reboot()  function	reboots  the  system.	The howto argument specifies the behavior of the system while rebooting and is a mask con-
       structed by a bitwise-inclusive-OR of flags from the following list:

       RB_AUTOBOOT     The machine is rebooted from the root filesystem on the default boot device. This is the default behavior. See boot(1M) and
		       kernel(1M).

       RB_HALT	       The processor is simply halted; no reboot takes place. This option should be used with caution.

       RB_ASKNAME      Interpreted by the bootstrap program and kernel, causing the user to be asked for pathnames during the bootstrap.

       RB_DUMP	       The  system  is	forced	to panic immediately without any further processing and a crash dump is written to the dump device
		       (see dumpadm(1M)) before rebooting.

       Any other howto argument causes the kernel file to boot.

       The interpretation of the bootargs argument is platform-dependent.

       Upon successful completion, reboot() never returns.  Otherwise, -1 is returned and errno is set to indicate the error.

       The reboot() function will fail if:

       EPERM	The {PRIV_SYS_CONFIG} privilege is not asserted in the effective set of the calling process.

       intro(1M), boot(1M), dumpadm(1M), halt(1M), init(1M), kernel(1M), reboot(1M), uadmin(2)

								    22 Mar 2004 							reboot(3C)
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