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ankush grover wrote:
hey friends,
Thanks for the all efforts and guidance that people took to help me in
configuring Clustering of Apache servers.I have 2 questions regarding the
LVS
a) I have 2 Apache servers running with Load Balancing through WLC
algorithm.Now suppose 1 server has 15 Active Connections and the 2nd Server
has 20 connections.Now suppose the server 2 goes down what will happen to
the connections made to Server 2 will those connection automatically shifted
to Server 1 or the clients will get the error message.
If you're using ldirectord (which it sounds like you are, from your
previous posts(?)), it will be fine. That is, the ldirectord (running on
the director) will detect that the 2nd apache server is not responding
to requests, and will remove the 2nd server from the table of real
servers to send requests to. All clients who were connected to the 2nd
server will automatically and seamlessly (provided there are no session
issues etc. involved) be reconnected to the 1st server.
You can test this by shutting down apache on the 2nd server and doing an
'ipvsadm -L' on the director. You should see that the only real server
servicing the service is the 1st apache server.
If both the 1st apache server and the 2nd apache server are still real
servers for the service when you have shut down apache on the 2nd
server, adjust your ldirectord.cf file so that it tests a connection to
the real servers to make sure that apache is responding to requests.
Horms posted this earlier - this is the sort of thing that tests that
apache is listening to requests on the real servers:
# Virtual Server for HTTP
virtual=192.168.1.42:80
fallback=127.0.0.1:80
real=192.168.1.67:80 gate
real=192.168.1.68:80 gate
service=http
request="index.html"
receive="Test Page"
scheduler=rr
#persistent=600
protocol=tcp
checktype=negotiate
What I want is that If any of the Server goes down the connections made to
that server should automatically redirected to the other server.
Please don't mind I have not gone through the whole documentation on LVS.
b) Any software which can show the Real Time Statistics on Cluster Servers
like number of connections made to the Servers,CPU load,Bandwidth
consumption,hard disk consumption etc. The most important If any server goes
down an email to the concerned person for that server telling that the
server is down.
You want something like Nagios for this. This is beyond the scope of
LVS, but plenty of web resources are available for Nagios and other
monitoring tools.
Cheers,
Guy.
Thanks & Regards
Ankush Grover
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