Trying to import a MySQL dump and/or starting mysqld return the following error :
[ERROR] bdb: fatal region error detected; run recovery
[ERROR] Fatal error: Can’t open and lock privilege tables: Table ‘host’ is read only
Probably the MySQL database directory does not have the right privileges. The permission scheme should look like this :
MySQL directory = 755 own by mysql and group mysql
Database directory = 700 own by mysql and group mysql
Database directory tables = 660 own by mysql and group mysql