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Full Discussion: Restart TomEE frequently because URL is not responding
Top Forums Web Development Restart TomEE frequently because URL is not responding Post 303031362 by hicksd8 on Wednesday 27th of February 2019 04:32:05 AM
Old 02-27-2019
Be warned that bumping posts are against the rules on this forum and moderators might sanction you for it.

Which load balancer (LB) are you using??

However, I would be likely to compare the 4 configurations (conf/server.xml) to explore any differences seen. TomEE still uses normal Tomcat Clustering and that needs checking out.

I would be inclined to guess that the LB is not overloading node1, on the contrary, the LB is continuing to send requests to node1 after that node has failed (for some reason). There is a fault (hardware, software or configuration) with node1.

The two minute delay you see to load the page is, in fact, the timeout before the request is successfully delivered to a surviving node. If everything is configured properly, it shouldn't take this long. Furthermore, once the failed node is kicked out of the cluster (until you issue the command for it to rejoin), the LB should know that node1 is dead and no longer send requests to it. You then run on three nodes after failover and all is fine and dandy.

So your problem is that failover is not occurring in an orderly fashion. I would confirm whether node1 is actually joining the cluster at all or you have a cluster of three plus a stand-alone node.

The way it should work is that the four cluster members should know immediately if one of them fails. The failed node gets kicked out. The surviving nodes relay this state to the LB which no longer sends requests to the failed node.

Which LB are you using??

Ref:
Apache TomEE
How to Setup Load Balancing in Tomcat/TomEE with mod_proxy_balancer - Simples Assim
Tomcat Clustering - A Step By Step Guide | MuleSoft
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LEARN ABOUT MINIX

httppower

httppower(8)							     powerman							      httppower(8)

NAME

       httppower - communicate with HTTP based power distribution units

SYNOPSIS

       httppower [--url URL]

DESCRIPTION

       httppower  is  a  helper program for powerman which enables it to communicate with HTTP based power distribution units.	It is run interac-
       tively by the powerman daemon.

OPTIONS

       -u, --url URL
	      Set the base URL.

INTERACTIVE COMMANDS

       The following commands are accepted at the httppower> prompt:

       auth user:pass
	      Authenticate to the base URL with specified user and password, using ``basic'' HTTP authentication which sends the user and password
	      over the network in plain text.

       seturl URL
	      Set the base URL.  Overrides the command line option.

       get [URL-suffix]
	      Send an HTTP GET to the base URL with the optional URL-suffix appended.

       post [URL-suffix] key=val[&key=val]...
	      Send an HTTP POST to the base URL with the optional URL-suffix appended, and key-value pairs as argument.

FILES

       /usr/sbin/httppower
       /etc/powerman/powerman.conf

ORIGIN

       PowerMan was originally developed by Andrew Uselton on LLNL's Linux clusters.  This software is open source and distributed under the terms
       of the GNU GPL.

SEE ALSO

       powerman(1), powermand(8), httppower(8), plmpower(8), vpcd(8), powerman.conf(5), powerman.dev(5), powerman-devices(7).

       http://sourceforge.net/projects/powerman

powerman-2.3.5							    2009-02-09							      httppower(8)
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