How to search using ssh on multiple hosts?

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How to search using ssh on multiple hosts?

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04-23-2014

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How to search using ssh on multiple hosts?

Hi guys - I am having a hard time trying to figure how to search for a certain string on config files hosted on multiple hosts.

This is an example:

Code:

Hostnames: myhost1.mycompany.com|myhost2.mycompany.com|myhost3.mycompany.com
 
String to search for: myipaddress.somehost.com
 
Directory structure (different in every host): /somedir/somedir/somedir

I understand that maybe I would need a script to solve this issue? as there are many hosts.

Any guidance would help.

DallasT

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04-23-2014

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if you have the passwordless ssh set-up between the server you are running the script and the target hostnames,

Code:

STRING='myipaddress.somehost.com'
DEST_PATH='/somedir/somedir/somedir'
old_IFS="${IFS}"
IFS="|"
echo 'myhost1.mycompany.com|myhost2.mycompany.com|myhost3.mycompany.com' | while read hname
do
  ssh -t -t ${hname} <<! > /log/dir/output.log
  grep ${STRING} ${DEST_PATH}/*
  exit
  !
done

IFS="${old_IFS}"

This User Gave Thanks to SriniShoo For This Post:

SriniShoo

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04-23-2014

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hi SriniShoo - thank you again. Some questions while I try this:

do I need to explicitly create this path:

Code:

/log/dir/output.log

Also is this a perl script? if not, what file extention should I save it as?

DallasT

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04-23-2014

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This is a shell script and you can save it with '.sh' extention.
Yes, you have to have the directory '/log/dir' created and the file gets created through the script. You can change the path to any other directory you have access to.

SriniShoo

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04-23-2014

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I get this error. I did not add any additional lines though:

Code:

./myscript.sh: line 14: syntax error: unexpected end of file

DallasT

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04-23-2014

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Sorry for the typo. Remove spaces before '!'

Code:

STRING='myipaddress.somehost.com'
DEST_PATH='/somedir/somedir/somedir'
old_IFS="${IFS}"
IFS="|"
echo 'myhost1.mycompany.com|myhost2.mycompany.com|myhost3.mycompany.com' | while read hname
do
  ssh -t -t ${hname} <<! > /log/dir/output.log
  grep ${STRING} ${DEST_PATH}/*
  exit
!
done

IFS="${old_IFS}

Also, please paste the entire myscript.sh file

SriniShoo

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04-23-2014

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Now i get another error:

Code:

./myscript.sh: line 7: /logs/output.log: No such file or directory

I have a "logs" dir inside the directory that contains "myscript.sh"

here is the full script:

Code:

STRING='mysearchstring'
DEST_PATH='/somedir/somedir/'
old_IFS="${IFS}"
IFS="|"
echo 'myhost1.mycompany.com|myhost2.mycompany.com|myhost3.mycompany.com' | while read hname
do
  ssh -t -t ${hname} <<! > /logs/output.log
  grep ${STRING} ${DEST_PATH}/*
  exit
!
done
IFS="${old_IFS}"

---------- Post updated at 09:58 AM ---------- Previous update was at 09:51 AM ----------

Actually i fixed the path

However, I just realized that its not passwordless connection. Hence the script dies

DallasT

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