Thursday, June 12, 2008

Undocumented VCB config.js feature

Duncan over at YellowBricks.com found a undocumented fearure in the VCB config.js file

One of my customers wanted to use the default VCB framework but did not want to quiesce the VM for several reasons. (Databases, Active Directory etc.) I could not find an option in the config.js file but noticed the following in the file glue.js:

// A fallback to be able to switch to non-quiesced snapshots
if (typeof(NO_QUIESCE) != "undefined") {
cmd +="-Q 0 ";
}

In other words, setting the option “NO_QUIESCE” with no value in config.js results in the VM not being quiesced, default it will quiesce the VM! I added the following line to the config.js file to accomplish this:

NO_QUIESCE=””;

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