[pgpool-general: 7296] Re: No TCP/IP connection to Pgpool on RHEL 8.2

[Anssi Kanninen]

Software versions are the same on both systems:
PostgreSQL 12.2
Pgpool 4.1.3

On 18 September 2020 02:31:11 EEST, Anssi Kanninen <anssi at iki.fi> wrote:
>Hello,
>
>My Pgpool doesn't work on RHEL 8.2.
>
>Eveythins runs smoothly on my Centos 8.1.1911 virtual machines but when
>I 
>transfer the same Pgpool/PostgreSQL configuration to customer's RHEL
>8.2, 
>I can not connect to Pgpool via TCP/IP.
>
>Here is a clip of my log on Centos when I successfully fail to 
>authenticate (x.x.x.x is a wrong interface, so this error is expected).
>So, "user" and "database" are show in the log.
>
>Sep 16 16:04:35 centos8i1 pgpool[6616]: [33-1] pid 6616: ERROR:  failed
>to authenticate
>Sep 16 16:04:35 centos8i1 pgpool[6616]: [33-2] pid 6616: DETAIL:  no
>pg_hba.conf entry for host "x.x.x.x", user "pgpool", database
>"postgres", SSL off
>
>Here is log of successful connection. Protocol Major is 3 and Minor is
>0.
>
>Sep 18 02:07:28 centos8i1 pgpool[27853]: [26-1] pid 27853: DEBUG: 
>reading startup packet
>Sep 18 02:07:28 centos8i1 pgpool[27853]: [26-2] pid 27853: DETAIL: 
>application_name: psql
>Sep 18 02:07:28 centos8i1 pgpool[27853]: [27-1] pid 27853: DEBUG: 
>reading startup packet
>Sep 18 02:07:28 centos8i1 pgpool[27853]: [27-2] pid 27853: DETAIL: 
>Protocol Major: 3 Minor: 0 database: postgres user: pgpool
>Sep 18 02:07:28 centos8i1 pgpool[27853]: [28-1] pid 27853: DEBUG: 
>creating new connection to backend
>Sep 18 02:07:28 centos8i1 pgpool[27853]: [28-2] pid 27853: DETAIL: 
>connecting 0 backend
>Sep 18 02:07:28 centos8i1 pgpool[27853]: [29-1] pid 27853: DEBUG: 
>creating new connection to backend
>Sep 18 02:07:28 centos8i1 pgpool[27853]: [29-2] pid 27853: DETAIL: 
>connecting 1 backend
>Sep 18 02:07:28 centos8i1 pgpool[27853]: [30-1] pid 27853: DEBUG: 
>creating new connection to backend
>Sep 18 02:07:28 centos8i1 pgpool[27853]: [30-2] pid 27853: DETAIL: 
>connecting 2 backend
>Sep 18 02:07:28 centos8i1 pgpool[27853]: [31-1] pid 27853: DEBUG: 
>authentication backend
>Sep 18 02:07:28 centos8i1 pgpool[27853]: [31-2] pid 27853: DETAIL: 
>auth kind:10
>Sep 18 02:07:28 centos8i1 pgpool[27853]: [32-1] pid 27853: DEBUG: 
>authentication backend 0
>Sep 18 02:07:28 centos8i1 pgpool[27853]: [32-2] pid 27853: DETAIL: 
>trying SCRAM authentication
>Sep 18 02:07:28 centos8i1 pgpool[27853]: [33-1] pid 27853: DEBUG: 
>SCRAM authentication successful for backend 0
>
>So, the above works.
>
>But then I transfer the same configuration to the customer's RHEL 8.2,
>the 
>same connection attempt shows this:
>
>Sep 18 01:48:31 haketikuqadb01 pgpool[348681]: [262-1] pid 348681:
>DEBUG:  I am 348681 accept fd 8
>Sep 18 01:48:31 haketikuqadb01 pgpool[348681]: [263-1] pid 348681:
>DEBUG:  reading startup packet
>Sep 18 01:48:31 haketikuqadb01 pgpool[348681]: [263-2] pid 348681:
>DETAIL:  Protocol Major: 1234 Minor: 5680 database:  user:
>Sep 18 01:48:31 haketikuqadb01 pgpool[348681]: [264-1] pid 348681:
>FATAL:  client authentication failed
>Sep 18 01:48:31 haketikuqadb01 pgpool[348681]: [264-2] pid 348681:
>DETAIL:  no pool_hba.conf entry for host "x.x.x.x", user "", database
>"", SSL off
>Sep 18 01:48:31 haketikuqadb01 pgpool[348681]: [264-3] pid 348681:
>HINT:  see pgpool log for details
>Sep 18 01:48:31 haketikuqadb01 pgpool[348612]: [46-1] pid 348612:
>DEBUG:  reaper handler
>Sep 18 01:48:31 haketikuqadb01 pgpool[348612]: [47-1] pid 348612: LOG: 
>child process with pid: 348681 exits with status 512
>
>Protocol Major and Minor numbers look strange and why the database name
>
>and user name are empty? Did it fail to read the incoming packet for
>some 
>reason? The connection was local but thru TCP/IP network interface.
>Linux 
>firewall was used but same ports were open on both clusters. SELinux is
>in 
>use.
>
>Psql client responds like this:
>
>psql: error: could not connect to server: server closed the connection
>unexpectedly
>         This propably means the server terminated abnormally
>         before or while processing the request.
>
>
>Here is my pool_hba.conf:
>
>local   all         all                               trust
>host    all         all         127.0.0.1/32          trust
>host    all         all         ::1/128               trust
>host    all         pgpool      samenet               scram-sha-256
>host    all         postgres    samenet               scram-sha-256
>
>My pool_passwd looks like this:
>
>postgres:AESmyencryptedpassword==
>pgpool:AESmyencryptedpassword==
>
>The psql command was as follows and the password was correct:
>
>$ psql -h x.x.x.x postgres pgpool -w
>
>So, something is different on our RHEL but what?
>
>Best regards,
>   Anssi
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