Changes between Version 5 and Version 6 of Internal/VirtualPL/ParallelImaging

Timestamp:

Sep 19, 2006, 4:04:06 PM (18 years ago)

Author:

shruti

Comment:

—

Internal/VirtualPL/ParallelImaging

@@ -21 +21 @@
 
 As a first step, some changes have been made to the imageNodes shell script which result in the identification of any concurrent running instance of nodeHandler. If the nodeHandler is already being run, it gives out a warning message to the user and exits. The nodeHandler in the meanwhile continues the imaging of the nodes. In case nodeHandler is not running, it will go ahead and image the nodes as specified. The modified imageNodes (imageNodes_new) is attached at the end of the page.
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+Date : 9/19/06
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+To image the nodes in parallel, instead of running multiple instances of nodeHandler, we are trying to bypass the nodeHandler itself and. The basic three functions of the nodeHandler 
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+1. Creating soft links with the node to server the basic memory based image,
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+2. Launching the frisbee server
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+3. And reseting the respective nodes.
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+will now be performed by the shell script imageNodes itself.
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+All these three commands can be executed using the xml querries at the command line. The querries for these three operations are:
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+For creating soft pxe links with a particular node:
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+http://pxe:5012/pxe/getAddress?img=<image name>&node=<node ID>&ip=<ip address of node>
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+For launching the frisbee server:
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+http://frisbee:5012/frisbee/getAddress?img=<image name to be launched>
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+In case the image is already launched, it will return the multicast address and port number for that image. If not it will launch that image on new port number and a default multicast address. Since new images are launched on new port, different multicast addresses for different images are not required.
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+Similarly the cmc service can be used to reset the nodes as follows:
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+http://cmc:5012/cmc/reset?x=<x co-ordinate of node>?&y=<y coordinate of node>
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+To implement these changes the imageNodes has been changed a bit. 
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+1. On running imageNodes it fisrt checks for the domain its running on and the nodes on which it has to serve the soft pxe link. It then creates a soft link using the pxe server, with the subnet number of the domain itself. 
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+2. It then launches the frisbee server on the tftpboot and starts giving out the image specified at the command line.
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+3. Resets the specific nodes using cmc.
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+The changed copy of imageNodes is attached at the end of the page.