[CentOS] wordpess can't connect to DB but mediawiki can
Tim Dunphy
bluethundr at gmail.com
Sun Aug 16 02:45:43 UTC 2015
>
> You were doing this (looking at the mysql.db table) on your
> "db.example.com" machine, correct?
db.example.com is a load balanced VIP. The VIP is being handled by
keepalived and HA/Proxy. There are two DB's setup in master/master
replication. The two databases and two load balancers are on AWS. The web
server and varnish servers are on digital ocean.
I setup a grant on db1 to allow access to the database from the load
balancers. And those permissions were automatically replicated over to the
second database. Once I set that up I was able to mysql into the load
balanced database and the media wiki started working. But the wordpress
site and the test php script still couldn't access the load balanced
database.
Thanks
On Sat, Aug 15, 2015 at 10:26 PM, Richard <
lists-centos at listmail.innovate.net> wrote:
> You were doing this (looking at the mysql.db table) on your
> "db.example.com" machine, correct?
>
>
> ------------ Original Message ------------
> > Date: Saturday, August 15, 2015 19:32:25 -0400
> > From: Tim Dunphy <bluethundr at gmail.com>
> > To: CentOS mailing list <centos at centos.org>
> > Subject: Re: [CentOS] wordpess can't connect to DB but mediawiki
> can
> >
> >>
> >> "Use" that db and then issue:
> >> select * from db where Db='jfwiki' or Db='jokefire' order by
> >> Host;
> >
> >
> > Well yeah. I used the mysql database before I issued that command.
> >
> >
> > MariaDB [(none)]> use mysql
> > Reading table information for completion of table and column names
> > You can turn off this feature to get a quicker startup with -A
> >
> > Database changed
> >
> > Then if I run that command for some reason there's no jfwiki or
> > jokefire entry in the db table:
> >
> > MariaDB [mysql]> select * from db where Db='jfwiki' or
> > Db='jokefire' order by Host;
> > Empty set (0.00 sec)
> >
> >
> > For some reason another database I imported to do bacula backups
> > has an entry in the db table:
> >
> > MariaDB [mysql]> select Host,Db from db;
> > +-----------+--------+
> >| Host | Db |
> > +-----------+--------+
> >| % | bacula |
> >| localhost | bacula |
> > +-----------+--------+
> > 2 rows in set (0.00 sec)
> >
> > However I'm thinking more along the lines of my php mysql client
> > having an issue. Although I'm still a little stuck on why the wiki
> > works without any problem and why neither my php script nor
> > wordpress are able to connect to the db. It's really strange how
> > that's happening!
> >
> >
> > On Sat, Aug 15, 2015 at 6:12 PM, Richard
> > <lists-centos at listmail.innovate.net
> >> wrote:
> >
> >>
> >> > Date: Saturday, August 15, 2015 17:57:03 -0400
> >> > From: Tim Dunphy <bluethundr at gmail.com>
> >>
> >> >>
> >> >> [this isn't really a centos issue, even if you're using centos,
> >> >> which isn't obvious. that said ...]
> >> >
> >> >
> >> > Yeah that's true. But this list tends to be rather helpful for
> >> > general problems that are less specific to centos. Sometimes. :)
> >> > Really seems to depend...
> >> >
> >> > Incidentally I am using centos on all hosts:
> >> >
> >> ># cat /etc/redhat-release
> >> > CentOS Linux release 7.0.1406 (Core)
> >> >
> >> > OK now that that's out of the way, for some reason I don't seem
> >> > to have an entry in my db database for either jokefire or
> >> > jfwiki:
> >> >
> >> > MariaDB [mysql]> select * from db where Db like 'jfwiki' or Db
> >> > like 'jokefire';
> >> > Empty set (0.00 sec)
> >> >
> >> > Not sure why that would be the case. They're definitely there on
> >> > this database server:
> >> >
> >> > MariaDB [mysql]> show databases;
> >> > +--------------------+
> >> >| Database |
> >> > +--------------------+
> >> >| bacula |
> >> >| information_schema |
> >> >| jfwiki |
> >> >| jokefire |
> >> >| mysql |
> >> >| performance_schema |
> >> > +--------------------+
> >> > 6 rows in set (0.00 sec)
> >> >
> >> > Any other ideas?
> >> >
> >> > Thanks,
> >> > Tim
> >> >
> >> > On Sat, Aug 15, 2015 at 3:07 PM, Richard wrote:
> >> >
> >> >>
> >> >>
> >> >> > Date: Saturday, August 15, 2015 13:53:28 -0400
> >> >> > From: Tim Dunphy <bluethundr at gmail.com>
> >> >> >
> >> >> > Hey guys,
> >> >> >
> >> >> > I'm running both a wordpress site as well as a mediawiki off
> >> >> > of the same web servers. The mediawiki site works great! The
> >> >> > wordpress site, meh. Not so much. I keep getting the common
> >> >> > database connection error:
> >> >> >
> >> >> > Error establishing a database connection
> >> >> >
> >> >> > And as far as I can tell the settings between the mediawiki
> >> >> > site and the wordpress site are nearly identical.
> >> >>
> >> >> < ... snip ... >
> >> >>
> >> >> [this isn't really a centos issue, even if you're using centos,
> >> >> which isn't obvious. that said ...]
> >> >>
> >> >> I would start by looking at the access control entries for the
> >> >> wp and mw dbs, (in the mysql.db table). Based on what you are
> >> >> trying here, there should be matching entries in that table
> >> >> for the "Db"s "jokefire" and "jfwiki" (e.g., for the Host as
> >> >> well as the various _priv fields).
> >> >>
> >> >> select * from db where Db='jokefire' or Db='jfwiki' order by
> >> >> Host\g
> >> >>
> >> >> There may be something else going on, but without knowing that
> >> >> the access control is as it should be there's not much value in
> >> >> speculating.
> >> >>
> >>
> >> The mysql access control bits are in tables in the mysql db that's
> >> in your list above.
> >>
> >> +---------------------------+
> >> | Tables_in_mysql |
> >> +---------------------------+
> >> | columns_priv |
> >> | db |
> >> | event |
> >> | func |
> >> ...
> >>
> >> "Use" that db and then issue:
> >>
> >> select * from db where Db='jfwiki' or Db='jokefire' order by
> >> Host;
> >>
> >>
> >> _______________________________________________
> >> CentOS mailing list
> >> CentOS at centos.org
> >> http://lists.centos.org/mailman/listinfo/centos
>
> ------------ End Original Message ------------
>
>
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