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Full Discussion: How to troubleshoot a 1000 nodes Apache cluster?
Operating Systems Linux Red Hat How to troubleshoot a 1000 nodes Apache cluster? Post 302750895 by thmnetwork on Wednesday 2nd of January 2013 06:36:54 PM
Old 01-02-2013
The load balancer is going to be a choking point (bandwidth and CPU utilization-wise). If it's bandwidth you may consider increasing the number of links. You can try to increase links through interface bonding. If it's CPU utilization, you might consider multiple load balances (kind of like google.com does) so you can spread load amongst several physical machines. I'd recommend doing that latter anyways, for availability reasons.

Before anyone can give you specific advice though, you need to localize the performance issue. For example, if you run a jMeter test against the serving nodes directly is that faster? If it is, then the load balancer is the choke point. If not then you may check to see if the network links are being saturated with some sort of command-line bandwidth checking tool (I use bwm-ng). If that's not the issue then move onto CPU, memory, etc. Once you've done that you should be in a better position to do something about the performance problems.

It's also possible that it's an application-level latency. For example if a particular website is served by a particular DB cluster and that cluster is going slow it may slow down the end user's experience.
 

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LEARN ABOUT DEBIAN

crm_report

1.1.7(8)						  System Administration Utilities						  1.1.7(8)

NAME

       1.1.7 - Part of the Pacemaker cluster resource manager

SYNOPSIS

       crm_report -f "YYYY-M-D H:M:S" [-t "YYYY-M-D H:M:S"] [additional options] [dest]

DESCRIPTION

       crm_report - Create a tarball containing everything needed when reporting cluster problems

OPTIONS

       -V     increase verbosity

       -v,--version
	      software version

       --features
	      software features

       -f, --from time
	      time to start from: "YYYY-M-D H:M:S"  (do not forget the quotes)

       -t, --to time
	      time to finish at (default: now)

       -T, --cts test
	      CTS test or set of tests to extract

       --cts-log
	      CTS master logfile

       -n, --nodes nodes
	      node names for this cluster only needed if the cluster is not active on the current machine accepts both -n "a b" and -n a -n b

       -l, --logfile file
	      log file to collect, normally this will be determined automatically

       -p patt
	      additional regular expression to match variables to be removed (default: "passw.*")

       -L patt
	      additional regular expression to match in log files for analysis (default: CRIT: ERROR:)

       -M     collect only the logs specified by -l

       -S, --single-node
	      single node operation; don't try to start report collectors on other nodes

       -c, --cluster type
	      force the cluster type (corosync,openais,heartbeat,logmaster)

       -A, --openais
	      force the cluster type to be OpenAIS

       -C, --corosync
	      force the cluster type to be CoroSync

       -H, --heartbeat
	      force the cluster type to be Heartbeat

       -u, --user user
	      ssh username for cluster nodes (default: root)

       --dest a custom destination directory/file

       dest   a custom destination directory/file

EXAMPLES

	      crm_report  -f  "2011-12-14 13:05:00" unexplained-apache-failure crm_report -f 2011-12-14 -t 2011-12-15 something-that-took-multiple
	      days crm_report -f 13:05:00   -t 13:12:00   brief-outage

1.1.7 - ee0730e13d124c3d58f00016c3376a1de5323cff		    April 2012								  1.1.7(8)
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