10-30-2009
Thanks for the answer.
Actually what I did not understand before was what was the value of running 2 instances of the same application on one node during the failover? If the resource group contains the same application on both nodes, why not just make takeover not happen here ? Because from the client point of view, the service still exists while running two same instances on one node may make the node overloaded.
As zxmaus pointed out that two same instances can server different purposes(say, database 1 is used for trading, database 2 for reporting). I think that makes sense. But if two instances serve the same purpose I still don't see the value in it.
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LEARN ABOUT DEBIAN
passenger-status
passenger-status(8) Adminstration Commands passenger-status(8)
NAME
passenger-status - inspect Phusion Passenger's internal status
SYNOPSIS
passenger-status [pid]
DESCRIPTION
passenger-status looks at the current status of a Phusion Passenger installation. It will locate Phusion Passenger automatically if it is
running and will give you a list of instances if there is more than one Phusion Passenger instance running. You can then select the
instance by specifying the relevant PID on the command line.
The general information section shows the following details:
max The maximum number of application instances that Phusion Passenger will spawn. This equals the value given for PassengerMaxPoolSize
in the configuration.
count The number of application instances that are currently alive. This value is always less than or equal to max.
active The number of application instances that are currently processing requests. This value is always less than or equal to count.
inactive
The number of application instances that are currently not processing requests, i.e. are idle. Idle application instances will be
shutdown after a while, as can be specified with PassengerPoolIdleTime in the configuration. The value of inactive equals count -
active.
The applications section shows each application instance, which directory it belongs to. The sessions field shows how many HTTP client are
currently being processed by that application instance.
OPTIONS
pid The process ID of the Phusion Passenger instance you want to look at
SEE ALSO
passenger-memory-stats(8), ps(1), top(1)
User guide at http://www.modrails.com/documentation.html
AUTHOR
Phusion Passenger is written by Phusion (http://www.phusion.nl)
"Phusion" and "Phusion Passenger" are trademarks of Hongli Lai & Ninh Bui.
This manual page was written by Neil Wilson <neil@brightbox.co.uk> for the Ubuntu project (but may be used by others).
Phusion Passenger 2.0 passenger-status(8)