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Full Discussion: Parse configuration file & add line in particular section
Top Forums Shell Programming and Scripting Parse configuration file & add line in particular section Post 302505573 by Aeudian on Thursday 17th of March 2011 10:02:01 AM
Old 03-17-2011
Parse configuration file & add/remove line in particular section
Greetings,

I recently built a replicated DRBD, Heartbeat, & iSCSI Target Initiator storage server on Ubuntu 10.04 to offer shared storage to server Vmware ESX and Microsoft Clusters. Everything works flawlessly, however I wanted to make a script to create, remove, grow volumes to offer ESX rather then having a technical diagram and instructions so that other technicians are able to do this process with limited Linux knowledge.

I know the basis to Linux scripting with variables and command scripting but I am not sure how to approach parsing a configuration file for iSCSI Target Initiator and adding lines between existing lines under a sub group. I figure it has to be done in an array but I am not sure how to keep it within a parameter as well as add a line adding the next sequential number available.

Let me give an example of my configuration file called ietd.conf:

Code:
Target iqn.2011-03.stroageserver.workgroup.net:VMware.Storage.1
	IncomingUser iqn.1998-01.com.vmware:esx001-3c494e40 password
	IncomingUser iqn.1998-01.com.vmware:esx002-7e5d5341 password
	IncomingUser iqn.1998-01.com.vmware:esx003-76a022ad password
        Lun 0 Path=/dev/replicated/resources,Type=blockio
        Lun 1 Path=/dev/replicated/volume1,Type=blockio
        Lun 2 Path=/dev/replicated/volume2,Type=blockio
	Alias VMwareStorageArray
        MaxConnections         1
        InitialR2T             Yes
        ImmediateData          No
        MaxRecvDataSegmentLength 8192
        MaxXmitDataSegmentLength 8192
        MaxBurstLength         262144
        FirstBurstLength       65536
        DefaultTime2Wait       2
        DefaultTime2Retain     20
        MaxOutstandingR2T      8
        DataPDUInOrder         Yes
        DataSequenceInOrder    Yes
        ErrorRecoveryLevel     0
        HeaderDigest           CRC32C,None
        DataDigest             CRC32C

Target iqn.2011-03.stroageserver.workgroup.net:Microsoft.Storage.1
	IncomingUser MSiSCSIAdmin password
        Lun 1 Path=/dev/replicated/volume3,Type=blockio
	Alias MicrosoftStorageArray
        MaxConnections         1
        InitialR2T             Yes
        ImmediateData          No
        MaxRecvDataSegmentLength 8192
        MaxXmitDataSegmentLength 8192
        MaxBurstLength         262144
        FirstBurstLength       65536
        DefaultTime2Wait       2
        DefaultTime2Retain     20
        MaxOutstandingR2T      8
        DataPDUInOrder         Yes
        DataSequenceInOrder    Yes
        ErrorRecoveryLevel     0
        HeaderDigest           CRC32C,None
        DataDigest             CRC32C

What I need to do is when my script asks the user which Server they wish to add storage too (lets say ESX) that it targets “Target iqn.2011-03.stroageserver.workgroup.net:VMware.Storage.1” and reads each “Lun #.....” and adds a line below LUN 2 (in example configuration file) as LUN 3? I will replace “/dev/replicated/<volume>” with a variable which I can do. I just do not know how to parse only the lines between “Target iqn” and the next “Target ign” looking for “LUN #” and adding a new line below the existing LUN with a higher sequential number.

I am also not sure how to approach gaps in LUN numbers when volumes are deleted. My assumption is to take the highest LUN # under the target and add one to it but I am not sure if this is correct?

Any insight would be great. Thanks.
Last edited by Aeudian; 03-22-2011 at 12:24 PM.. Reason: Title Change
 

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