Re: [Bug / Question ] " authentication_timeout " is invalid.

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От 林俊彥
Тема Re: [Bug / Question ] " authentication_timeout " is invalid.
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Msg-id CAGRvhK2a+8bcY7pAZy47Ke=Tn99Vhgw1GJ=pEWgojEroqiLa4A@mail.gmail.com
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Ответ на Re: [Bug / Question ] " authentication_timeout " is invalid.  (Jeff Janes <jeff.janes@gmail.com>)
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Hi , Jeff,
      Thank you for reply.  I used to use in the following ways but still could not be verified:
-----------  Log start ---------------------
[BEGIN] 2015/9/17 11:51:51
[postgres@pg95 ~]$ cat test.sh 

#!/bin/bash
ip a |grep eth0
psql -h 100.200.100.211<<EOF
show authentication_timeout;
select now();
\! sh net_test.sh
select now();
EOF

[postgres@pg95 ~]$ cat net_test.sh 

#!/bin/bash
sudo ifdown eth0
sleep 90
sudo ifup eth0

[postgres@pg95 ~]$ ./test.sh 
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfif
o_fast state UP qlen 1000
    inet 100.200.100.211/8 brd 100.255.255.255 scope global eth0
 authentication_timeout 
------------------------
 1min
(1 row)
              now              
-------------------------------
 2015-09-17 11:52:43.842508+08
(1 row)
              now              
-------------------------------
 2015-09-17 11:54:18.161079+08
(1 row)

[END] 2015/9/17  11:54:35

-----------  Log end  ----------------------


Could you give me an example to verify it? Let me verify it is active or not. thank you !!


best regards,

James



2015-09-16 23:52 GMT+08:00 Jeff Janes <jeff.janes@gmail.com>:
On Wed, Sep 16, 2015 at 3:27 AM, 林俊彥 <james.lin@cenoq.com> wrote:
Hi, sir,

the "postgresql.conf" 's "authentication_timeout"  is not active.

The Log:
-------------------------------------------------------------------------------------------------
[BEGIN] 2015/9/16  17:57:37
[postgres@pg95 ~]$ psql -V
psql (PostgreSQL) 9.5alpha2
[postgres@pg95 ~]$ time psql -c 'show authentication_timeout ;'
Password: 
 authentication_timeout 
------------------------
 1min
(1 row)
real 4m39.528s
user 0m0.003s
sys 0m0.002s

[END] 2015/9/16  18:03:10
---------------------------------------------------------------------------------------------------
The document is said :
From: 


authentication_timeout (integer)

Maximum time to complete client authentication, in seconds. If a would-be client has not completed the authentication protocol in this much time, the server closes the connection. This prevents hung clients from occupying a connection indefinitely. The default is one minute (1m). This parameter can only be set in the postgresql.conf file or on the server command line.


I can't find about this information or solution by goolge search or forum,
Please tell me how to verify it is active . or check it  running?

What happens behind the scenes is that psql first tries to connect without a password.  It is told that it can't connect without a password.  It closes the uncompleted connection.  Then psql asks you for a password, waits until you enter one, and then starts a new connection using the password. So during the wait time, there is no pending connection to the database to be timed out.  It is the client program psql which is doing the waiting, not the database server.

Cheers,

Jeff


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