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Thomas Champagne escribió:
Hi
I would like to create a high availability LAMP. But I have only two
machines.
I have read the Streamline High Availability and Load Balancing :
http://www.ultramonkey.org/3/topologies/sl-ha-lb-overview.html
The situation :
My config is available here :
http://jay.bertrand.free.fr/blog/uploads/images/cluster.png
I have two servers on Debian GNU/Linux Etch with IP : 10.5.195.40 and
10.5.195.41
There are two services on each servers : Apache and Mysql.
Each service have its IP and have a VIP address :
10.5.195.120 -> apache
10.5.195.121 -> Mysql
OK, In your case I will balance only apache and in the test includes a
test with a mysql connection.
Apache 1 --> Mysql 1
Apache 2 --> Mysql 2
You need one PC more to use with keepalived, lvs director, ultramonkey ....
In the test you can test a page of the server which connects with
mysql... If mysql goes down.. all the server goes down and you have
another server OK...
The problem :
Accessing services from a remote client (outside the cluster) to the
VIP is
ok.
But when the client is the cluster, it always connects on the local
machine.
For example, when Apache connects to the VIP Mysql with PHP script, it
always connect to the local Mysql.
It was ok. It's caused for ROUTES.
So if Mysql is down on the local but up on the other, Apache can't
connect
to Mysql.
I have read that to solve the problem in the LVS HOwTO :
http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.LVS-DR.html#realserver_as_client_in_LVS-DR
But as it is written in the man page of iptables :
"Please note: This target requires kernel support that might not be
available in official Linux kernel sources or
Debian's packaged Linux kernel sources. And if support for this
target is
available for the specific Linux kernel source
version, that support might not be enabled in the current Linux kernel
binary."
This command returns nothing :
ls /lib/modules/2.6.18-4-686/kernel/net/ipv4/netfilter/ | grep ROUTE
So, I can't use the target ROUTE.
There is an other solution ?
Thomas Champagne
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