Re: FW: Setting up streaming replication problems - Mailing list pgsql-general

Do you mind me bumping the issue?

Zitat von "Thiemo Kellner, NHC Barhufpflege"
<thiemo.kellner@gelassene-pferde.biz>:

> Andreas, thanks for your reply.
>
>>> I try to set up synchronous streaming replication as try-out. I use my
>>> laptop with Debian 9 and PostgreSQL package 10+189.pgdg90+1. And of
>>> this PostgreSQL installation I have two clusters main (master) and
>>> main2 (hot standby). I tried with Rigg's book and the PostgreSQL
>>> documentation and some pages on the web, but fail miserably.
>>
>> you have one cluster with 2 nodes ;-)
>
> Ähm, right. Been more in a hurry than I thought as it shows below as well.
>
>> Note: it's a bad idea to build a synchronous cluster with only 2 nodes,
>> you need at least 3 nodes
>
> I am aware that synchronous clustering might deadlock the master. To
> have a hot standby on the same metal does not make much sense
> either. This is just a try out though. The proof of me being stupid,
> so to speak. ;-)
>
>> that's the recovery.conf, not pg_hba.conf. And you don't need it on the
>> master.
>
> Copy paste blunder (see above ;-))
>
>>> standby_mode = 'off'
>>> primary_conninfo = 'host=localhost user=repuser port=5433
>>> password=<md5 value of password>'
>>> restore_command = 'false'
>>
>> why that?
>
> Uhm, cannot remember *blush*, I removed it but it made no difference.
>
>> master or standby? confused...
>
> C&p blunder again. Standby.
>
>>> standby_mode = 'on'
>>> primary_conninfo = 'host=localhost user=repuser port=5433
>>> password=<md5 value of password>'
>>
>> the same port as above?
>
> I keep repeating myself: C&p blunder again: nope
>
>>> 1) I am not sure whether to put the md5 value of the repuser password
>>> into primary conninfo or the plain one. I don't feel the documentation
>>> or the book is clear on that.
>
> Anyone two dimes on that?
>
>>> 2) Starting the clusters, I do not see any attempt of the hot standby
>>> to connect to the master.
>
> I put logging back to more sane info as debug did not give me any
> useful information on that (maybe due to my noobdom). But I cannot
> see any connection attempt...
>
>> are the 2 nodes running on different ports?
>
> Yes, 5432 master, 5433 standby
>
>> You need only 1 recovery.conf, on the standby.
>
> But does it hurt? I just had the idea that role change would be
> easier. master <-> standby
>
>> restore_command = 'false'
>> is useless, i'm guessing that's the reason that the standby doesn't
>> connect to the master.
>
> Uhm, is it useless or does it prevent connection? Anyway, I removed
> it and it did not make a difference.
>
>> Greetings from Dresden, Andreas
>
> :-) Greetings from Bannholz@Hochrhein :-D
>
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