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Joe, please take a look at this. It explains why I am asking this
question.
On my load balancer, you can see that I have two RS listening on port
3001, and both are up..
[root@lb1 ]# ipvsadm|grep 3001
TCP extrovert.mycharts.md:3001 lblc persistent 360
-> 192.168.10.62:3001 Masq 1 0 0
-> 192.168.10.61:3001 Masq 1 0 0
[root@lb1 scripts]#
Now I'll stop the service listening on the server at 192.168.10.61...
[root@appftp1 ]# service tomcat5_001 stop
Stopping tomcat: Using CATALINA_BASE: /alley/site001/tomcat5
Using CATALINA_HOME: /alley/site001/tomcat5
Using CATALINA_TMPDIR: /alley/site001/tomcat5/temp
Using JAVA_HOME: /usr/java/j2sdk1.4.2_09
Back on the load balancer, the down server is detected immediately...
[root@lb1 /]# ipvsadm|grep 3001
TCP extrovert.mycharts.md:3001 lblc persistent 360
-> 192.168.10.62:3001 Masq 1 0 0
-> 192.168.10.61:3001 Masq 0 0 0
[root@lb1 /]#
Now back on the RS, I'll start the service back up...
[root@appftp1 /]# service tomcat5_001 start|grep "startup in"
INFO: Server startup in 4023 ms
[root@appftp1 /]#
The LB instantly detects the RS is back up...
[root@lb1 /]# ipvsadm|grep 3001
TCP extrovert.mycharts.md:3001 lblc persistent 360
-> 192.168.10.62:3001 Masq 1 0 0
-> 192.168.10.61:3001 Masq 1 0 0
[root@lb1 /]#
So we know the healthchecks are working, right?
But now look at this. On the LB, I'll change the weight manually, check
it, wait 60 seconds, and check it again...
[root@lb1 /]# ipvsadm -e -t 192.168.5.100:3001 -r 192.168.10.61 -w 0 -m
[root@lb1 /]# ipvsadm|grep 3001
TCP extrovert.mycharts.md:3001 lblc persistent 360
-> 192.168.10.62:3001 Masq 1 0 0
-> 192.168.10.61:3001 Masq 0 0 0
[root@lb1 /]# sleep 60
[root@lb1 /]# ipvsadm|grep 3001
TCP extrovert.mycharts.md:3001 lblc persistent 360
-> 192.168.10.62:3001 Masq 1 0 0
-> 192.168.10.61:3001 Masq 0 0 0
[root@lb1 /]#
Still down after a full minute! And it will *stay* down until I run
ipvsadm with -w 1
This is what makes me wonder why I seem to get different behavior from
the command line than from the healthchecks. I'm sure it must be
something simple that I am overlooking.
--
Eric Robinson
Director of Information Technology
Physician Select Management, LLC
775.885.2211 x 111
-----Original Message-----
From: lvs-users-bounces@xxxxxxxxxxxxxxxxxxxxxx
[mailto:lvs-users-bounces@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of Robinson,
Eric
Sent: Thursday, December 04, 2008 8:28 AM
To: LinuxVirtualServer.org users mailing list.
Subject: Re: [lvs-users] How to Tell If an RS Is Really Up
>you're asking if you can tell whether a command like `date` was run by
>a script or from the command line.
Yeah, I figured that out belatedly. I was just explaining the process
that lead me there.
So now I need to figure out why I can set my servers' weights to 0 and
they don't bounce back to 1 after the next healthcheck. Conversely they
do automatically get set from 1 to 0 if the service running on the RS
goes down.
--
Eric Robinson
Disclaimer - December 4, 2008
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