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RE: [Linux-cluster] ccs_test tool



Thanks James.
I don't know much about python, but it seems simple enough for my
purposes.

Greetings,
Marcos David

-----Original Message-----
From: linux-cluster-bounces redhat com
[mailto:linux-cluster-bounces redhat com] On Behalf Of James Parsons
Sent: quarta-feira, 15 de Novembro de 2006 19:03
To: linux clustering
Subject: Re: [Linux-cluster] ccs_test tool

Marcos Gil Ferreira David wrote:

>Is the result will be the stdin to another app, no problem running as 
>root.
>
>Guess will have to learn a bit about python...
>
>
>Thanks
>Marcos David
>
>-----Original Message-----
>From: linux-cluster-bounces redhat com
>[mailto:linux-cluster-bounces redhat com] On Behalf Of James Parsons
>Sent: quarta-feira, 15 de Novembro de 2006 17:42
>To: linux clustering
>Subject: Re: [Linux-cluster] ccs_test tool
>
>Marcos Gil Ferreira David wrote:
>
>  
>
>>Hello,
>>
>>I have a two-node cluster with several services running on it. Each of
>>    
>>
>
>  
>
>>these services needs an ip address that configured in the cluster (a 
>>Cluster IP Address).
>>
>>My problem is that in order for some of our applications to function 
>>properly I need to know the ip address that is assigned to a given 
>>service.
>>
>>Example:
>>
>>Extracted from /etc/cluster/cluster.conf:
>>
>>....
>>
>><service autostart="1" domain="cluster0" name="MySQL">
>>
>><fs ref="shared_mysql">
>>
>><ip ref="172.18.57.8">
>>
>><script ref="mysql"/>
>>
>></ip>
>>
>></fs>
>>
>></service>
>>
>>...
>>
>>Is there any application (perhaps ccs_test) that can give me the ip 
>>address assigned to the MySQL service (or any other service), without 
>>dumping the entire cluster.conf on console?
>>
>>    
>>
>No, but a python script could pull it out for you in prolly less than 
>20 lines. It would have to run as root, though, in order to read the 
>conf file. Do you need this to work in an automated fashion as stdin to

>another app?
>
>-J
>
>  
>
Ok...23 lines...you will need to add some error checking :)

#!/usr/bin/python
 


from xml.dom import minidom, Node
def main():
  try:
    parent = minidom.parse("/etc/cluster/cluster.conf")
  except IOError, e:
    pass  #Do something meaningful here
 


  nodes = parent.firstChild.getElementsByTagName('fs')
  for node in nodes:
    if node.hasAttribute('ref'):
      ref = node.getAttribute('ref')
      if ref.strip() == 'shared_mysql':
        ipnodes = node.getElementsByTagName('ip') #There had better be 
only one!       
        addr = ipnodes[0].getAttribute('ref')
        print addr
    else:
      pass  #Do something meaningful here as well...
 


 


if __name__ == "__main__":
  main()


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