[ome-users] Omero Cluster Setup

[Josh Moore]

On Fri, Mar 29, 2019 at 5:53 AM qingwei wei <tchengwee at gmail.com> wrote:
>
> Hi Josh,

Hi Cw,


> What i want to achieve is HA for Omero Server, scalability is good to have but i can do away with that. I currently already configure Patroni for Postgres and i would like to have Omero Server to be HA also.

OMERO does not yet support multi-master. We're in the process of
separating out various pieces of functionality into microservices to
enable it, but the common session service is not yet implemented.
(Likely to be redis in our case).

You can use read-only instances however as one or more slaves that can
continue processing non-write activities while you, for example,
restart your master node. This is the ansible configuration for the
read-only copies running behind the Image Data Resource (IDR):

https://github.com/IDR/deployment/blob/fbc2d2d362f34ea8bbf8691b0f1290e91d14a995/ansible/idr-omero-readonly.yml#L82


> Regards,
> Cw

Hope that helps,
~Josh.


> On Thu, Mar 28, 2019 at 5:09 AM Josh Moore <josh at glencoesoftware.com> wrote:
>>
>> On Wed, Mar 27, 2019 at 7:34 AM qingwei wei <tchengwee at gmail.com> wrote:
>> >
>> > Hi,
>>
>> Hi Cw,
>>
>>
>> > I manage to setup Omero Server and Omero Web and i am currently planning to setup Omero Server cluster. I am currently looking at the following links:
>> >
>> > https://docs.openmicroscopy.org/omero/5.4.0/sysadmins/grid.html
>> > https://docs.openmicroscopy.org/omero/5.4.0/developers/Server/Clustering.html
>> >
>> > 1. Am i right to say that grid is for distributed background processing and blitz is for user session?
>>
>> Generally, yes. The "Processor" described in the documentation is for
>> running OMERO.scripts
>> (https://docs.openmicroscopy.org/omero/5.4.10/developers/scripts/index.html).
>>
>> > 2. For the grid setup, the example on multiple nodes is assigning slave-node for processor node. Can we have both master and slave running as processor node?
>>
>> Yes, that's fine. There are two layers here.
>>
>>  * Masters and slaves are nodes. The only thing that the master _must_
>> run is the router:
>> https://github.com/openmicroscopy/openmicroscopy/blob/develop/etc/templates/grid/default.xml#L50
>>
>>  * The OMERO "servers" run inside of those nodes. Processors can be
>> any. It's best to only have one Blitz server in the master node. It's
>> a bit out of date, but you might find looking at
>> https://github.com/openmicroscopy/omero-grid-docker#running-the-images
>> informative for how to launch different servers.
>>
>>
>> > 3. For the blitz setup, am i right to say i just need to follow the grid setup guide but make sure i add the blitz server instance on both master and slave node?
>>
>> No. There should be only one blitz service. Unfortunately, the user
>> session component is not horizontally scalable. If that's what you
>> want, you might prefer to look at a read-only copy:
>> https://docs.openmicroscopy.org/omero/5.4.10/developers/Server/Clustering.html#read-only
>>
>>
>> > 4. I need to run this config for blitz cluster setup?
>> >
>> > bin/omero config set omero.cluster.redirector configRedirector
>>
>> That's an extension point that's not particularly used. Depending on
>> what you are trying to achieve,
>> it might become of value. Can you tell us more about what you would
>> like to do with OMERO?
>>
>>
>> > Thanks,
>> > Cw
>>
>> ~J.
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