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In case it's useful, I also have this in the debug log:

IP: 127.0.0.1
Start command line script update.php
[caches] cluster: EmptyBagOStuff, WAN: mediawiki-main-default, stash: db-replicated, message: SqlBagOStuff, session: SqlBagOStuff
[caches] LocalisationCache: using store LCStoreNull
[DBConnection] Wikimedia\Rdbms\LoadBalancer::openConnection: calling initLB() before first connection.
[DBReplication] Wikimedia\Rdbms\LBFactory::getChronologyProtector: using request info {
"IPAddress": "127.0.0.1",
"UserAgent": false,
"ChronologyProtection": false,
"ChronologyPositionIndex": 0
}
[DBConnection] Wikimedia\Rdbms\LoadBalancer::openConnection: failed to connect to database 0 at 'localhost'.
[DBConnection] Wikimedia\Rdbms\LoadBalancer::reportConnectionError: connection error: Unknown error ([Null])
[exception] [6b70dd5bdc9deadcca99506a] [no req] Wikimedia\Rdbms\DBConnectionError from line 1004 of /usr/share/mediawiki/includes/libs/rdbms/d
atabase/Database.php: Cannot access the database: No database connection
#0 [...etc. same as below]




-------- Original Message -------- (MI, 2020-11-29 11:23)
> I upgraded a Debian 9 "Stretch" server to Debian 10 "Buster", which
> also upgrades Mediawiki to version 1.31.
>
> Trying to run update.php, it fails with "Cannot access the database:
> No database connection":
>
> /var/lib/mediawiki/maintenance# php update.php
> MediaWiki 1.31.10 Updater
>
> Your composer.lock file is up to date with current dependencies!
> [6b70dd5bdc9deadcca99506a] [no req] Wikimedia\Rdbms\DBConnectionError from line 1004 of /usr/share/mediawiki/includes/libs/rdbms/database/Database.php: Cannot access the database: No database connection
> Backtrace:
> #0 /usr/share/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1140): Wikimedia\Rdbms\Database->reportConnectionError(string)
> #1 /usr/share/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(750): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
> #2 /usr/share/mediawiki/includes/GlobalFunctions.php(2813): Wikimedia\Rdbms\LoadBalancer->getConnection(integer, array, boolean)
> #3 /usr/share/mediawiki/maintenance/Maintenance.php(1311): wfGetDB(integer, array, boolean)
> #4 /usr/share/mediawiki/maintenance/update.php(147): Maintenance->getDB(integer)
> #5 /usr/share/mediawiki/maintenance/doMaintenance.php(94): UpdateMediaWiki->execute()
> #6 /usr/share/mediawiki/maintenance/update.php(248): require_once(string)
> #7 {main}
>
> The database is Postgresql, and I can access it fine with psql etc.
>
> In LocalSettings.php I have
>
> ## Database settings
> $wgDBtype = "postgres";
> $wgDBserver = "localhost";
> $wgDBname = "wikidb";
> $wgDBuser = "...hidden...";
> $wgDBpassword = "...hidden...";
>
> # Postgres specific settings
> $wgDBport = "5432";
> $wgDBmwschema = "mediawiki";
> $wgDBts2schema = "public";
>
> Thanks for any help...
>
> MI
>
>
> _______________________________________________
> MediaWiki-l mailing list
> To unsubscribe, go to:
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On Sun, Nov 29, 2020 at 5:24 AM MI <mi.lists@alma.ch> wrote:
>
> I upgraded a Debian 9 "Stretch" server to Debian 10 "Buster", which also upgrades Mediawiki to version 1.31.
>
> Trying to run update.php, it fails with "Cannot access the database: No database connection":

It sounds like you have a MySQL (or Postgres) problem.

There can be a few causes of MySQL problems. An upgrade can overwrite
mysql.conf. The directory permissions are not correct for MySQL
(especially logging).

I think you should first ensure MySQL is started and running.
https://duckduckgo.com/?q=troubleshot+mysql+start+problem.

Jeff

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