[ome-users] Marino don't shows thumbnails of Images

[Ilya Goldberg]

I'll jump in too.

In a remote client (like shoola or a browser), there are two  
connections.  One is to the OME back-end, and one is to the image  
server (OMEIS).  The back-end keeps track of which image server a given  
image is on and generates appropriate URLs for the client to retrieve  
image data (i.e. the thumbs, etc).

The location of the image server is stored in the repositories table.   
Its possible to use several image servers simultaneously (but each  
image is associated with exactly one OMEIS).
The thumbnail display is done by making the client get it directly from  
the appropriate image server, which can be on a different machine than  
the "back-end".  This arrangement allows for a great deal of  
scaleability.

Now, if you put everything on localhost, and that's the only name you  
use for all your servers, then everything will work out fine as long as  
your "remote" clients are not actually remote - as long as all  
connections are local.  When you try to contact a "back-end" over a  
network, it will generate URLs for the appropriate image servers based  
on settings in the repositories table.  If these are all on  
"localhost", then the remote client will be told to look for the images  
on "localhost" (i.e. locally), instead of on the real image server  
(which is remote).

In other words, you have to tell the back-end (in the repositories  
table) the name by which the OMEIS server is known to all the other  
computers that might connect to it.
The easy, correct way is to use a fully qualified network name (a FQDN)  
for the image server and back-end (i.e. when the installer asks you for  
the URL to use for the OMEIS).  Depending on your networking setup,  
that may require a dynamic DNS server hooked up to your DHCP server, or  
doing things manually by assigning IP addresses and playing around with  
hosts files.  A good networking setup should ensure that all computers  
have a FQDN resolvable by the local DNS.

A better default setting would probably be the result of a  
reverse-lookup on the host's IP address.


As Tomasz pointed out, these settings can be modified using the ome  
command-line tool (this is only available in CVS-HEAD now, not in the  
current stable release).

-Ilya


On Aug 25, 2005, at 10:06 AM, gerhard wrote:

> Chris Allan wrote:
>> Gerhard,
>>
>> UPDATE repositories SET image_server_url = <the_proper_url> WHERE  
>> attribute_id = 2;
>>
>> Ciao.
>>
>> -Chris
>>
>> On Thu, Aug 25, 2005 at 01:04:30PM +0200, gerhard wrote:
>>
>>> Chris Allan wrote:
>>>
>>>> I'd say you've got the image server URL misconfigured.
>>>>
>>>> Open up "psql ome" as authenticated user and run:
>>>>
>>>> SELECT * FROM repositories;
>>>>
>>>> What's the result of that?
>>>>
>>>> Ciao.
>>>>
>>>> -Chris
>>>>
>>>>
>>>> On Wed, Aug 24, 2005 at 06:08:16PM +0200, gerhard wrote:
>>>>
>>>>
>>>>> I installed OME on two different computers. If I access Marino on  
>>>>> each
>>>>> computer local I can see the thumbnails of imported pictures. So I  
>>>>> think
>>>>> it's not a browser problem. But if I access marino remote I can  
>>>>> see the
>>>>> thumbnails just on one of the two ome-installed computers. On the  
>>>>> second
>>>>> it doesn't work. Theres just a small bar where the thumb should be.
>>>>>
>>>>> I'll be glad if someone has an idea about that problem.
>>>>> gerhard
>>>>> _______________________________________________
>>>>> ome-users mailing list
>>>>> ome-users at lists.openmicroscopy.org.uk
>>>>> http://lists.openmicroscopy.org.uk/mailman/listinfo/ome-users
>>>>>
>>>>>
>>>>
>>>>
>>> Thanks for reply here's the output:
>>>
>>> postgres at BIO-INFO39:~> psql -d ome -c"select * from repositories"
>>> attribute_id | module_execution_id |        image_server_url         
>>> | path | is_local
>>> --------------+--------------------- 
>>> +--------------------------------+------+----------
>>>            2 |                     | http://localhost/cgi-bin/omeis  
>>> |      | f
>>> (1 row)
>>>
>>>
>>>
>>
>>
> Thanks Chris,
> now it works.
>
> Do you know if there's an environment variable or something like that.
> Because as I mentioned I installed OME on two computers. On one I could
> see the thumbnails when I connected remote but on the other there was
> just a bar where the thumbnail should be. As you gave me the hint that  
> I
> should look into the repositories table I did this on both computers.
> But there was no difference.
> Sorry about that question I am just trying to understand the system.
>
> Thanks a lot
> gerhard
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