[Serusers] ser mysql/cache sync

[Greger V. Teigre]

I am not aware of a publicly available patch for LVS to do Call-id 
stickiness.
g-)

Jack Wei wrote:
> Greger,
>
> Thanks for the help.  Do you know if a patch is readily available?  I
> am currently using Ultra Monkey.
>
> Jack
>
> --- "Greger V. Teigre" <greger at teigre.com> wrote:
>
>> Jack Wei wrote:
>>> i am running a cluster with 2 sers.  i start the 1st ser and several
>>> users registers.  the users show up in both the cache and the mysql
>>> db.  then i start the 2nd ser, and it loads the db into the cache.
>>> when the cache entries in the 2nd server times out, the entries are
>>> deleted from the db.  however, when the users registers in the 1st
>>> ser, they aren't entered into the db.  how do i fix this problem?
>>>
>>> the db_mode is set to "2" w/ timer_interval at "10".  i've even
>>> tried setting the db_mode to "1", but that didn't help.
>>
>> Write-through DB mode will write all usrloc changes to the DB.
>> However, all locations are cached in ser memory. This means that
>> there is no way a secondary ser can reload a location from DB. If a
>> location is not found in memory, it is assumed not there.  A new
>> caching approach has been discussed previously on this list (or was
>> it serdev?).
>>
>> You can do the following:
>> - Use write-through DB mode to the shared SQL DB
>> - Use t_replicate to the secondary ser
>> - On the secondary ser, call save_memory() instead of save() (as the
>> location has already been saved in DB)
>>
>> This only works for deployment scenarios where EUCs are not NATed.
>> The reason is that the secondary ser will have another public IP
>> address than the primary and restricted NATs will not accept
>> incoming packets from other IPs than the one the EUC has registered
>> to.
>>
>> The way to solve this is to either route all INVITEs coming to the
>> secondary through the primary (ex. using Path) or to set up LVS (or
>> similar) where both SERs have the same IP address.  However,
>> currently LVS does not do Call-id based load balancing and people
>> who report this scenario have patched LVS or use a commercial load
>> balancing solution.
>>
>> g-)
>>
>>
>
>
> Jack Wei
>
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