Re: Need inputs on postgresql HA with consul cluster

Hi Kaido,

Using patroni 3+ version, even though enabled failsafe_mide, still if
consul cluster down, master db going down. Replicas remaining same.

On Thu, Dec 21, 2023, 09:49 Rambabu V <ram(dot)wissen(at)gmail(dot)com> wrote:

> thanks Kaido, applied to the above option. getting good result.
>
> On Thu, Dec 21, 2023 at 2:30 AM kaido vaikla <kaido(dot)vaikla(at)gmail(dot)com>
> wrote:
>
>> @Rambabu
>> You can try this: DCS Failsafe Mode
>> https://patroni.readthedocs.io/en/master/dcs_failsafe_mode.html#id2
>> https://speakerdeck.com/cyberdemn/failsafe-patroni-3-dot-0
>> br
>> Kaido
>>
>>
>> On Wed, 20 Dec 2023 at 19:42, kaido vaikla <kaido(dot)vaikla(at)gmail(dot)com>
>> wrote:
>>
>>> Consul is DCS for patroni. If consul cluster is completely down, then
>>> patroni is unaware of state of cluster.
>>> And "In above case if consul down , db master node going down, replica
>>> nodes remains recovery mode"
>>> is expected. Actually this behave protects database from split brain
>>>
>>> br
>>> Kaido
>>>
>>>
>>> On Wed, 20 Dec 2023 at 03:52, Rambabu V <ram(dot)wissen(at)gmail(dot)com> wrote:
>>>
>>>> Hi Karthik,
>>>>
>>>> This is docker based Postgtresql, behavior is different than our normal
>>>> one for failover and promotion.
>>>>
>>>> On Wed, Dec 20, 2023, 03:05 Karthik Yellapragada <
>>>> karthik(dot)yellapragada(at)gmail(dot)com> wrote:
>>>>
>>>>> May be you can pg auto failover..
>>>>>
>>>>> On Tue, Dec 19, 2023 at 9:33 AM Rambabu V <ram(dot)wissen(at)gmail(dot)com>
>>>>> wrote:
>>>>>
>>>>>> Thanks, any alternative solution for my requirement .
>>>>>>
>>>>>> In above case if consul down , db master node going down, replica
>>>>>> nodes remains recovery mode.its complete downtime.
>>>>>>
>>>>>> On Tue, Dec 19, 2023, 22:23 Scott Ribe <scott_ribe(at)elevated-dev(dot)com>
>>>>>> wrote:
>>>>>>
>>>>>>> > On Dec 19, 2023, at 7:12 AM, Rambabu V <ram(dot)wissen(at)gmail(dot)com>
>>>>>>> wrote:
>>>>>>> >
>>>>>>> > Hi Team,
>>>>>>> >
>>>>>>> > We have implemented postgresql HA with Patroni + Consul cluster on
>>>>>>> Docker based PostgreSQL Setup.
>>>>>>> >
>>>>>>> > We are seeing the issue below.
>>>>>>> >
>>>>>>> > our consul cluster built with 3 nodes, if consul cluster
>>>>>>> completely down, Patroni triggering failover.
>>>>>>> > Is there any option to prevent this failure even if the consul
>>>>>>> cluster is down also?
>>>>>>> >
>>>>>>> > and also any effective alternative for HA for docker based
>>>>>>> PostgreSQL setup?
>>>>>>>
>>>>>>> How do you expect to have working HA without working networking?
>>>>>>>
>>>>>>> --
>>>>> Thanks & Regards
>>>>> Karthik Yellapragada
>>>>> +1 860 830 5235
>>>>>
>>>>