Re: [leshan-dev] Shared Redis instance

[Eva Rott <eva.rott@xxxxxxxxxxxx>]

Hi,

thanks for the quick response.

> Let me ask back, why do you want to use redis at all?
> To persist some state? The DTLS session? The lwm2m data 
(registrations and observe-requests)?

I would indeed like to persist the lwm2m registrations and observations 
across application / server restarts.

> (Maybe you looking more for something as a "graceful restart".)
I've only found information about the graceful restart combined with 
DTLS, so I guess that's not the solution for me, or did I miss something 
there?

Best regards
Eva



On 24.03.22 10:18, Kraus Achim (IOB/PAD-DDA-HU) via leshan-dev wrote:
> Hi Eva,
>
> > I have a question concerning the use of Redis. I have multiple Leshan servers with few clients registered on each and I'd like to use only one Redis instance for all of them.
>
> Let me ask back, why do you want to use redis at all?
> To persist some state? The DTLS session? The lwm2m data (registrations and observe-requests)?
>
> Usually redis was used in order to share that data among several nodes of a cluster.
>
> If there is a different requirement or useful function, I guess you should address that more directly.
> (Maybe you looking more for something as a "graceful restart".)
>    
> Mit freundlichen Grüßen / Best regards
>
>   Achim Kraus
>
> Bosch IoT Hub - Product Area IoT Platform (IOC/PAP-HU)
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>
> -----Original Message-----
> From: leshan-dev <leshan-dev-bounces@xxxxxxxxxxx> On Behalf Of Eva Rott
> Sent: Mittwoch, 23. März 2022 21:53
> To: leshan-dev@xxxxxxxxxxx
> Subject: [leshan-dev] Shared Redis instance
>
> Hi,
>
> I have a question concerning the use of Redis. I have multiple Leshan servers with few clients registered on each and I'd like to use only one Redis instance for all of them.
>
> Now I was wondering, how I could achieve that. For example, is it possible to add a prefix to the Redis keys? E.g. FIRST_APP:REG:EP, OTHER_APP:REG:EP.
>
> The only other thing I've found so far is the database int value that can be specified when creating the JedisPool. This would be my fallback solution but I'd definitely prefer not having to keep track of the database IDs.
>
> I've also thought about overriding/modifying the Redis key prefixes in the RedisRegistrationStore but since they are private I'm not really considering going toward that direction.
>
>
> Any help will be very much appreciated.
>
> Thanks in advance.
>
> Best regards
> Eva
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