[Linux-cluster] Clarifications needed on Setting up a two node HA cluster

Digimer lists at alteeve.ca
Tue Jun 26 17:22:52 UTC 2012

Is your primary concern load balancing or high availability?

On 06/26/2012 10:36 AM, Zama Ques wrote:
> Hi ,
> I need to setup a two node HA cluster on top of HP blade servers using
> Redhat Cluster Solution.  I have started going through the docs and have
> the following  doubts as of now.
> I am planning to build my two node setup based on the following
> architecture as shown in Fig 1.1 in
> http://www.centos.org/docs/5/pdf/Cluster_Administration.pdf
> As per t'he above fig, I am planning to build my setup as per the
> following .
> 1) Each of the nodes will have two interfaces. One interface say eth0 on
> both the nodes will be assigned private addresses and
>      will be connected to a switch which will be used for cluster
> traffic.The other interface on both the nodes say eth1 will be
>      assigned public ip address and will be connected to another switch
> which is connected to internet via a firewall/router . I
>      will also be assigning a virtual public ip address to the cluster
> by configuring a ip resource in conga. This ip address I
>     will add it to  Listen directive in apache configuration file  so
> that apache listens on this ip address only to serve client
>      requests. This ip address will also resolve to a registered domain
> name for our portal which we are going to serve by this
>      setup.
>     And as a prerequisite for conga setup , I will update /etc/hosts on
> both nodes by supplying FQDNs
>     corresponding to private ip address assigned earlier on eth0 on both
> the nodes.
> 2) Regarding storage , I am not sure as of now what kind of storage
> device will be used . If it is not a SAN storage
> than I will  configure one of the partitions on the storage as iscsi
> target and will share it to both the cluster nodes.
>  From both the cluster nodes , I will create volumes using clvm and will
> use GFS on top of it as file system .
> 3)Regarding cluster resource , we will be using apache as one of the
> resource to serve http traffic. Will configure apache
> using Conga and after configuration is done , will copy the httpd config
> file manually to the other cluster node . Will not
> start apache service on both cluster nodes and will leave it to cluster
> software to start services . Will also do chkconfig
> httpd off on both the nodes and will also not update /etc/fstab with the
> GFS file system leaving it to cluster node to handle
> mounting of a file system.
> Sorry for writing too lenghthy  , but want to clear my doubts before
> starting up.
> Will be very much grateful if members can read my long mail with
> patience and reply back whether I am going in the right direction.
> Thanks in Advance
> Zaman
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