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From Roland RoLaNd <r_o_l_a_...@hotmail.com>
Subject RE: [users@httpd] syncing across web cluster
Date Mon, 23 Jan 2012 15:02:38 GMT


Thank you for your prompt reply.
I'm considering the rsync option as such;
for i in {1..7};do rsync -auze ssh  Source user@$i:destination  #on all 7 servers
though i might have a prob if a user edits a document (.doc files) on lets say ws1 and the
other servers sync to it ..


> Date: Mon, 23 Jan 2012 09:56:37 -0500
> From: mark@catseye.org
> To: users@httpd.apache.org
> CC: r_o_l_a_n_d@hotmail.com
> Subject: Re: [users@httpd] syncing across web cluster
> 
> On January 23, 2012 9:35 , Roland RoLaNd <r_o_l_a_n_d@hotmail.com> wrote:
> > i've successfully setup web clustering between 7 web servers.
> 
> How did you set up clustering?  There are several ways, and which one 
> you chose can affect the answer to your question below.
> 
> 
> 
> > now i'm having a prob where a user uploads a file, and it only exists 
> > on the server that his session landed on.
> >
> > I'm seeking your help in possible ways to propagate files uploaded 
> > across servers.
> 
> Let's assume your web servers are running under Linux.
> 
> The easiest way (ignoring what you've already done to set up clustering) 
> is to use NFS to share the document root directories for your web 
> virtual hosts and/or to share the upload directories.  That is, one of 
> your machines will be a fileserver and export these directories to all 
> of the other web servers in your cluster.  If you need fault tolerance, 
> you can have multiple front-end servers with heartbeat and automatic 
> failover, possibly backed by a SAN.
> 
> Another option is to have all web servers in your cluster periodically 
> (say, once every 5 minutes) synchronize their upload directories with 
> one another -- or, better and easier, a central host -- via rsync.
> 
> What may be the best way is to not store the files in a filesystem, but 
> instead store them in a database -- preferably a NoSQL database such as 
> MongoDB or Cassandra -- so that all web servers can access them.  This 
> would require changing any script that uses the uploaded files to 
> retrieve them from the database instead of from the filesystem.
> 
> --
>    Mark Montague
>    mark@catseye.org
> 
 		 	   		  
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