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Remote reboot script

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# 1  
Old 08-26-2014
Remote reboot script
I'm a beginner in shell scripting and doing simple scripts for work requirement.

Code:
#!/bin/bash

for blade in  `cat machines.txt` 

do

  rsh  $blade 'reboot'

done

but when I try it with root password it's throwing error saying permission denied.We're using same root password for all the machines.
Does this work or is there any other way to reboot machines remotely using script?

RA
Last edited by Franklin52; 08-26-2014 at 07:24 AM.. Reason: Please use code tags
# 2  
Old 08-26-2014
Can you log in interactively with rsh?
# 3  
Old 08-26-2014
Lightbulb
How do you run/execute this script? I guess you try to run it like so: ./yourscript.sh but probably this won't work due to the missing execute bit on the newly created script.

I see two solutions: You set that bit manually with chmod u+x yourscript.sh or you override it like so bash yourscript.sh

Code:
$ cat <<EOF >test-script.sh
> #!/bin/bash
> echo TEST
> EOF
$ ./test-script.sh
bash: ./test-script.sh: Permission denied
$ bash test-script.sh 
TEST
$ chmod u+x test-script.sh 
$ ./test-script.sh 
TEST
$

# 4  
Old 08-27-2014
I agree with RudiC,

Can you prove that you can connect as a plain command first? If not, then there is a bigger problem than just a permission denied.

You could also try rsh localhost to check it's not the rsh command itself that is not denied.

A few questions though:-
  • What OS and versions are in play here?
  • Does it fail to connect to every server in the list, or just the first and abort?
  • Are you expecting to supply a password, or should this be a trusted connection?
  • When the shutdown/boot does fire off, how do you expect your process to return? Would being killed off by the shutdown be acceptable?

It might be slightly neater to use:-
Code:
while read blade
do
   rsh $blade 'reboot'
done < machines.txt



Robin
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