[pgpool-general: 1728] Re: pgpool - issue with md5

Tatsuo Ishii ishii at postgresql.org
Tue May 14 08:15:22 JST 2013


It seems the trace is not very usefull because it was not against
right process. Pgpool consists of multiple process. You need to attach
one of pgpool child process you are trying to connect. Unfortunately
the process is determined by kernel, and we cannnot predict it. So
here is the workaround:

1) set "num_init_children = 1". This will limit the number of process
possbily selected by the kernel to 1. Restart pgpool.

2)  Look for the process number which looks like by ps:

5052 pts/6    S      0:00 pgpool: wait for connection request

3) attach strace to the process and start session from psql
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese: http://www.sraoss.co.jp

> Hi,
> I tried strace, with pgpool running in daemon mode, with debug option. Would it be possible to have a look at the trace output and identify what is wrong?
> Regards,
> Jayadevan
> 
> 
>>-----Original Message-----
>>From: Tatsuo Ishii [mailto:ishii at postgresql.org]
>>Sent: Thursday, May 09, 2013 9:12 AM
>>To: web at mr-paradox.net
>>Cc: Jayadevan M; ishii at postgresql.org; pgpool-general at pgpool.net
>>Subject: Re: [pgpool-general: 1706] Re: pgpool - issue with md5
>>
>>> sounds smilier to the problem i had the solution was:
>>> http://www.pgpool.net/mediawiki/index.php/FAQ
>>> I cannot use MD5 authentication if start pgpool without -n option. Why?
>>> You must have given -f option as a relative path: i.e. "-f pgpool.conf", rather
>>than full path: i.e. "-f /usr/local/etc/pgpool.conf". Pgpool tries to locate the
>>full path of pool_passwd (which is neccesary for MD5 auth) from pgpool.conf
>>path. This is fine with -n option. However if pgpool starts without -n option, it
>>changes current directory to "/", which is neccessary processs for
>>daemonizing. As a result, pgpool tries to open "/pool_passwd", which will not
>>successs.
>>
>>Good point. So Jayadevan may look into different pool_passwd file. strace will
>>reveal the problem...
>>--
>>Tatsuo Ishii
>>SRA OSS, Inc. Japan
>>English: http://www.sraoss.co.jp/index_en.php
>>Japanese: http://www.sraoss.co.jp
>>
>>> On May 8, 2013, at 8:00 PM, Jayadevan M
>><jayadevan.maymala at ibsplc.com> wrote:
>>>
>>>> Hi,
>>>> Though the password I am supplying is the same and I have not made any
>>changes to the pgpol password, the values in the error message change. Is
>>that how it should be?
>>>>
>>>> 2013-05-08 18:23:48 DEBUG: pid 3301: password does not match:
>>>> frontend:md57a15dc0847a23d5def2b5c7941d8460d
>>>> pgpool:md5f51e3de26a7f16dbc7ff99b582e882ab
>>>> 2013-05-08 18:23:51 DEBUG: pid 3317: password does not match:
>>>> frontend:md54d973dd3805852de6ef2a9d15a46346d
>>>> pgpool:md554da49b85b7f3f2ebb9bc676182f9d69
>>>>
>>>> Regards,
>>>> Jayadevan
>>>> -----Original Message-----
>>>> From: Tatsuo Ishii [mailto:ishii at postgresql.org]
>>>> Sent: Thursday, May 09, 2013 4:29 AM
>>>> To: Jayadevan M
>>>> Cc: pgpool-general at pgpool.net
>>>> Subject: Re: pgpool - issue with md5
>>>>
>>>>> Hi,
>>>>> I have been trying to get md5 authentication work with pgpool and keep
>>running into issues (pgpool not picking the right pool_passwd file and so on).
>>Right now, all that seems to be solved, but I am getting a "psql: FATAL:
>>password authentication failed for user "hbsi"" error. I am attaching the
>>debug output from pgpool. It looks like the password from the frontend and
>>the one in pgpool config keeps changing.
>>>>> An error
>>>>
>>>> It seems the cause of the error is apparent: you supplied wrong password.
>>>>
>>>> 2013-05-08 18:23:51 DEBUG: pid 3317: password does not match:
>>>> frontend:md54d973dd3805852de6ef2a9d15a46346d
>>>> pgpool:md554da49b85b7f3f2ebb9bc676182f9d69
>>>>
>>>> Are you sure to give pgpool same password which is used when you
>>created pool_passwd entry?
>>>>
>>>>> read_password_packet_password: failed to read password packet "p"
>>>>> is also present.
>>>>
>>>> This is normal. psql tries to connect to pgpool with no auth and pgpool
>>rejects it with the message, then psql retry with md5 auth.
>>>> --
>>>> Tatsuo Ishii
>>>> SRA OSS, Inc. Japan
>>>> English: http://www.sraoss.co.jp/index_en.php
>>>> Japanese: http://www.sraoss.co.jp
>>>>
>>>>
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> 
> 
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