[svlug] Mirroring of files to all nodes in a cluster

Link Dupont link at sub-pop.net
Tue Nov 21 20:31:39 PST 2017

I use syncthing to replicate certain directory subtrees across a few 
different systems. Works *really* well for my use of replicating stuff 
like ~/.dotfiles and ~/Documents.


On Tue, Nov 21, 2017 at 2:59 PM, Robert Hajime Lanning 
<lanning at lanning.cc> wrote:
> GlusterFS would work just fine.  It's just a matter of configuration.
> When you create a volume use replicate only with a replication factor
> set to your node count.
> Use the FUSE mount client pointing to localhost. The FUSE client will
> get the cluster configuration from the node you specify (localhost) 
> and
> will write to all replicas in real-time and read from the local 
> replica
> (replica with lowest latency).
> Do remember that this is not asynchronous replication.  Writes are
> real-time to all replicas and a write will not return until all
> available bricks are written to.  Locks are also attained on all
> replicas in real-time.
> On 11/21/17 10:04, David Rosenstrauch wrote:
>>  I'm looking for a Linux utility that will allow me to 
>> mirror/replicate a
>>  directory tree onto each and every node in a cluster, so that the 
>> data
>>  will reside on the local disk on each machine.  However, I'm not 
>> seeing
>>  anything that quite fits that bill.  So far I've found:
>>  * DRBD
>>  * Gluster FS
>>  However, each one doesn't seem to achieve what I want in some key 
>> way:
>>  * DRBD seems to only really work for 2-node master/slave replica 
>> type
>>  setups.  However I'm going to have a master and multiple slaves (at
>>  least 3 right now, and almost certainly more in the future).  It 
>> doesn't
>>  sound like DRBD supports that.
>>  * Gluster seems to be a distributed file system.  I.e., the data 
>> gets
>>  sharded and spread across the multiple nodes in the cluster.  
>> However,
>>  this would mean that there is not a complete local copy on each 
>> node.
>>  Anyone have a recommendation for tool that will achieve what I want?
>>  Obviously homegrown rsync scripts running on each node would be an
>>  option here, but I was hoping to not have to roll my own solution 
>> for
>>  this.  Also, of course, if I'm mistaken about either DRBD or 
>> Gluster's
>>  capabilities, please feel free to correct.
>>  Thanks,
>>  DR
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> --
> Mr. Flibble
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> http://www.linkedin.com/in/RobertLanning
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