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Your PHP installation appears to be missing the MySQL extension which is required by WordPress.

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I recently deployed a new WordPress installation to my existing production webserver running Apache, MySQL and PHP for other websites, yet I was presented with the following message.

“Your PHP installation appears to be missing the MySQL extension which is required by WordPress.”

This thread at wordpress.org did not help me, however I was able to solve the problem, but this thread is now marked as closed. That’s poor form because I can’t share the solution I found.

My PHP configuration file did not have the following.

#php.ini
[PHP]
extension=mysql.so

Adding this and restarting Apache did not fix the problem.

The problem was more fundamental and required PHP to be recompiled. Orginally PHP was configured with the ‘–with-mysqli’ option. PHP requires the ‘–with-mysql’ which is rather stupid they have this dependency.

Recompiling PHP and adding the necessary extension were both necessary to get my new WordPress installation operational.

Installing WordPress on Oracle Enterprise Linux LAMP stack

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A company blog can be easily configured in under 10 minutes using WordPress, a popular open source LAMP product that runs a reported 12+ million blogs including those found at CNN, NY Times, Wall Street Journal (WSJ), ZDNet, MTV, People Magazine, Playstation and eBay.

A company blog is a great way for the dissemination of information to your user base as well as enabling a means of user feedback via comments.

The following steps show you how to download, configure and get your WordPress blog operational.

Software Pre-Requisites

Software Installation

su -
cd /tmp
wget  http://wordpress.org/latest.tar.gz
cd /var/www/html
tar xfz /tmp/latest.tar.gz
mv wordpress blog

You can now visit http://localhost/blog and you will be presented with a message of an un-configured WordPress environment. You can streamline the MySQL portion of this configuration with the following commands.

cd blog
sed -e "s/database_name_here/blog/;s/username_here/blog_user/;s/password_here/sakila/" wp-config-sample.php > wp-config.php
mysql -uroot -p -e "CREATE SCHEMA blog"
mysql -uroot -p -e "CREATE USER blog_user @localhost IDENTIFIED BY 'sakila'"
mysql -uroot -p -e "GRANT SELECT,INSERT,UPDATE,DELETE,CREATE on blog.* TO blog_user@localhost"

Returning now to http://localhost/blog you simply only need to specify a Title, password and email address, click Save and your Blog at http://localhost/blog is complete and operational.



MySQL Structures

Looking at the tables that are created by the installation process:

$ mysql -ublog_user -psakila blog

mysql> show tables;
+-----------------------+
| Tables_in_blog        |
+-----------------------+
| wp_commentmeta        |
| wp_comments           |
| wp_links              |
| wp_options            |
| wp_postmeta           |
| wp_posts              |
| wp_term_relationships |
| wp_term_taxonomy      |
| wp_terms              |
| wp_usermeta           |
| wp_users              |
+-----------------------+
11 rows in set (0.00 sec)

mysql> SELECT table_name,engine,table_rows FROM information_schema.tables WHERE table_schema = 'blog';
+-----------------------+--------+------------+
| table_name            | engine | table_rows |
+-----------------------+--------+------------+
| wp_commentmeta        | MyISAM |          0 |
| wp_comments           | MyISAM |          1 |
| wp_links              | MyISAM |          7 |
| wp_options            | MyISAM |        109 |
| wp_postmeta           | MyISAM |          1 |
| wp_posts              | MyISAM |          2 |
| wp_term_relationships | MyISAM |          8 |
| wp_term_taxonomy      | MyISAM |          2 |
| wp_terms              | MyISAM |          2 |
| wp_usermeta           | MyISAM |         13 |
| wp_users              | MyISAM |          1 |
+-----------------------+--------+------------+
11 rows in set (0.00 sec)

Additional References

Short URL for this post rb42.com/oel-install-wordpress

Has your blog been hacked?

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While not a MySQL topic, as most of my readers view my MySQL Blog, my WordPress blog has been hacked? Has yours?

Like many, I’m sure you may have read about it like at WordPress blogs under attack from hack attack but I was surprised when my custom permlinks did not work.

Being surprised I looked at Administrator accounts, and I found that there was one more number then being displayed in the list. I had to dig into the database to find the problem.

mysql> select * from wp_users where ID in (select user_id from wp_usermeta where meta_key = 'wp_capabilities' and meta_value like '%admin%');
+-----+-------------+------------------------------------+---------------+------------------------------+---------------------------+---------------------+---------------------+-------------+--------------+
| ID  | user_login  | user_pass                          | user_nicename | user_email                   | user_url                  | user_registered     | user_activation_key | user_status | display_name |
+-----+-------------+------------------------------------+---------------+------------------------------+---------------------------+---------------------+---------------------+-------------+--------------+
|   1 | admin       | $P$BHZFK/prDplb/W/024yrH49JvAmmCE. | ronald        | [email protected] | http://ronaldbradford.com | 2005-11-21 23:43:47 |                     |           0 | Ronald       |
| 127 | ronald      | $P$B..e75VtFsv9bUGj5H5NTiXXPQIitr1 | ronald        | [email protected]    | http://ronaldbradford.com | 2009-02-22 20:13:33 |                     |           0 | ronald       |
| 133 | ChaseKent87 | $P$Bl8cVSzBums33Md6u2PQtUVY2PPBHK. | chasekent87   |                              |                           | 2009-09-05 06:36:59 |                     |           0 | ChaseKent87  |
+-----+-------------+------------------------------------+---------------+------------------------------+---------------------------+---------------------+---------------------+-------------+--------------+
3 rows in set (0.00 sec)

mysql> delete from wp_users where ID=133;
mysql> delete from wp_usermeta where user_id=133;

However the damage has been done, and an update to the recommend 2.8.4 is unlikely to fix the data corruption.

Being a good DBA I have a nightly backup of my database. Being a diligent system administrator, I have not 1 copy, by 3 copies of my system, one on my web site and two offsite.

The problem is I don’t keep older backups of my data, only a day old version.