I have pulled off DSpace high availability setup on 6.3 by using a high 
availability setup of both Postgres and Solr,  and using an NFS share for 
the assetstore folder. As a read-only database this worked fine but the 
issue arose when you wanted to authenticate a user. A clustering solution 
is required for the session objects, I suspect it may be possible to do at 
a Tomcat level but I have not attempted it.

If you are needing to run index-discovery constantly, I would take a look 
at your clustering solution for Solr as it may not be correctly 
synchronising data between nodes.

On Thursday, 24 February 2022 at 04:35:08 UTC+11 
[email protected] wrote:

> Dear, Mark
>
> Solr is running correctly, what I was missing was to index the 
> synchronized data. 
>
> After running */dspace/bin/dspace index-discovery*  I could visualize the 
> content of my repository (communities, collections and publications). Every 
> time the assetstore is synchronized I have to run the indexing. I was 
> planning to create a cron job to perform this process. 
>
> *If there is another method to configure Dspace in high availability*, 
> please let me know your comments. 
>
> Thank you very much
>
> El lunes, 21 de febrero de 2022 a las 8:28:06 UTC-5, [email protected] 
> escribió:
>
>> On Fri, Feb 18, 2022 at 10:35:26AM -0800, Gina Alegre Milla wrote: 
>> > In order to have high availability applied to my DSpace repository (7), 
>> I 
>> > have set up a DSpace master and replica, the database is synchronized 
>> and 
>> > assetstore is being shared to the replica via the NFS file system. 
>> > Initially everything was running normal, the data was being replicated 
>> but 
>> > when creating the collections and publications, the metadata of these 
>> is 
>> > not shown. 
>> > 
>> > Internally this information is stored in the database as well as in the 
>> > assetstore, but in the browser I can only visualize the communities. 
>> Indeed 
>> > in my master everything is working well, the problem is in the replica. 
>> > 
>> > Please if you could comment if I am configuring the replication 
>> correctly 
>> > or if I am ignoring something. Also if it is possible to use another 
>> method 
>> > to configure DSpace in high availability. 
>>
>> You haven't mentioned Solr. Is it working properly with the replica 
>> DSpace instance? 
>>
>> Do you find anything of interest in DSpace's logs on the replica host? 
>>
>> -- 
>> Mark H. Wood 
>> Lead Technology Analyst 
>>
>> University Library 
>> Indiana University - Purdue University Indianapolis 
>> 755 W. Michigan Street 
>> Indianapolis, IN 46202 
>> 317-274-0749 <(317)%20274-0749> 
>> www.ulib.iupui.edu 
>>
>

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