Thread: SQLSTATE[08006] [7] server closed the connection unexpectedly

Yvon Thoraval wrote:
> I do have a strange probleme when connecting to a database thru php using PDO.
> When connecting to the php script thru a browser i get the following error :
> HTTP 500 (Internal Server Error)
> 
> 
> Not really informative, then i've tried the php script thru Command Line where i get :
> yt@D620 /home/yt/Sites/yt_tests $ php index.php
> PHP Fatal error:  Uncaught exception 'PDOException' with message 'SQLSTATE[08006] [7] server closed
> the connection unexpectedly
>     This probably means the server terminated abnormally
>     before or while processing the request.' in /home/yt/Sites/yt_tests/index.php:75
> Stack trace:
> #0 /home/yt/Sites/yt_tests/index.php(75): PDO->__construct('pgsql:dbname=yt...', 'yt', 'yvon5533')
> #1 {main}
>   thrown in /home/yt/Sites/yt_tests/index.php on line 75
> zsh: exit 255   php index.php
> 
> 
> Line 75 being :
> $db = new PDO("pgsql:dbname=$dbname;host=$host;", $username, $password );
> 
> I should say i do NOT have any prob when connecting directly to this database using :
> $ psql -h <IPV4 or IPV6 of the PostgreSQL server> -U yt -d yt_tests
> 
> I'm stuck, i don't see any way to debugg that prob.

Is this repeatable?

That message normally means that the server process crashed.
What is in the PostgreSQL server log file?
You may want to set log_statement='all' in postgresql.conf
to get more context.

Yours,
Laurenz Albe

Yvon Thoraval wrote:
>> You may want to set log_statement='all' in postgresql.conf

> i did this change , restart PostgreSQL and test again, with the same error, however postgres log
> didn't report any error, as far as i understand the log :
> 
> 2012-09-14 18:43:14 CEST LOG:  received fast shutdown request
> 2012-09-14 18:43:14 CEST LOG:  aborting any active transactions
> 2012-09-14 18:43:14 CEST LOG:  autovacuum launcher shutting down
> 2012-09-14 18:43:14 CEST LOG:  shutting down
> 2012-09-14 18:43:14 CEST LOG:  database system is shut down
> 2012-09-14 18:43:17 CEST LOG:  database system was shut down at 2012-09-14 18:43:14 CEST
> 2012-09-14 18:43:17 CEST LOG:  incomplete startup packet
> 2012-09-14 18:43:17 CEST LOG:  database system is ready to accept connections
> 2012-09-14 18:43:17 CEST LOG:  autovacuum launcher started

Well, "received fast shutdown request" would explain what is
going on.  The server shuts down, and all active connections
are terminated, which on the client end looks exactly like
you described.

What is odd is that you say it is repeatable.
What could be sending SIGINT to the postmaster whenever
you try to connect?  Are database server and web server
on the same machine?
Try to find out what is going on there.
How does the log look when you enable
log_connections and log_disconnections in postgresql.conf?

Yours,
Laurenz Albe