На FreeBSD 6.2-RELEASE был установлен mysql-server-4.1.25,
удалил его и установил другую, более позднюю версию mysql-server-5.5.5_1
После этого демон mysqld перестал загружаться, вот что в журнале:

    100806 12:00:46 mysqld_safe Starting mysqld daemon with databases from /var/db/mysql
    100806 12:00:46 [Warning] option 'thread_stack': unsigned value 65536 adjusted to 131072
    100806 12:00:46 [Warning] option 'thread_cache_size': unsigned value 131072 adjusted to 16384
    100806 12:00:46 [Warning] option 'thread_stack': unsigned value 65536 adjusted to 131072
    100806 12:00:46 [Warning] option 'thread_cache_size': unsigned value 131072 adjusted to 16384
    100806 12:00:46 [Note] Buffered information: Performance schema disabled (reason: start parameters).

    100806 12:00:46 [Note] Plugin 'FEDERATED' is disabled.
    /usr/local/libexec/mysqld: Table 'mysql.plugin' doesn't exist
    100806 12:00:46 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
    InnoDB: The InnoDB memory heap is disabled
    InnoDB: Mutexes and rw_locks use InnoDB's own implementation
    InnoDB: Compressed tables use zlib 1.2.3
    100806 12:00:46  InnoDB: highest supported file format is Barracuda.
    InnoDB: 127 rollback segment(s) active.
    100806 12:00:47 InnoDB 1.1.1 started; log sequence number 43634
    100806 12:00:47 [ERROR] /usr/local/libexec/mysqld: unknown option '--skip-locking'
    100806 12:00:47 [ERROR] Aborting

    100806 12:00:47  InnoDB: Starting shutdown...
    100806 12:00:52  InnoDB: Shutdown completed; log sequence number 1588724
    100806 12:00:52 [Note] /usr/local/libexec/mysqld: Shutdown complete

    100806 12:00:52 mysqld_safe mysqld from pid file /var/db/mysql/bx4.msk.vbrr.loc.pid ended

Хорошо, запускаю mysql_upgrade:

    /usr/ports/> mysql_upgrade
    Looking for 'mysql' as: mysql
    Looking for 'mysqlcheck' as: mysqlcheck
    Running 'mysqlcheck with default connection arguments
    mysqlcheck: Got error: 2002: Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2) when trying to connect
    FATAL ERROR: Upgrade failed
    /usr/ports/>

Что эта за ошибка такая - Can't connect to local MySQL server through socket '/tmp/mysql.sock'

Вот my.cnf:

    [root@bx4] /usr/ports/> cat /var/db/mysql/my.cnf
    # Example MySQL config file for small systems.
    #
    # This is for a system with little memory (<= 64M) where MySQL is only used
    # from time to time and it's important that the mysqld daemon
    # doesn't use much resources.
    #
    # You can copy this file to
    # /etc/my.cnf to set global options,
    # mysql-data-dir/my.cnf to set server-specific options (in this
    # installation this directory is /var/db/mysql) or
    # ~/.my.cnf to set user-specific options.
    #
    # In this file, you can use all long options that a program supports.
    # If you want to know which options a program supports, run the program
    # with the "--help" option.

    # The following options will be passed to all MySQL clients
    [client]
    #password       = your_password
    port            = 3306
    socket          = /tmp/mysql.sock

    # Here follows entries for some specific programs

    # The MySQL server
    [mysqld]
    port            = 3306
    socket          = /tmp/mysql.sock
    skip-locking

    ### key_buffer = 16K
    key_buffer = 256M
    ###8192K

    max_allowed_packet = 1M

    ###table_cache = 4
    table_cache = 512
    tmp_table_size = 128M
    join_buffer_size = 4M
    ###2048

    query_cache_limit = 2M
    query_cache_size = 256M
    query_cache_type = 1

    sort_buffer_size = 32M
    ###64K

    read_buffer_size = 256K
    read_rnd_buffer_size = 256K
    net_buffer_length = 2K
    thread_stack = 64K

    ###
    thread_cache = 128K
    #thread_cache_size = 128K

    # Don't listen on a TCP/IP port at all. This can be a security enhancement,
    # if all processes that need to connect to mysqld run on the same host.
    # All interaction with mysqld must be made via Unix sockets or named pipes.
    # Note that using this option without enabling named pipes on Windows
    # (using the "enable-named-pipe" option) will render mysqld useless!
    #
    #skip-networking
    server-id       = 1

    # Uncomment the following if you want to log updates
    #log-bin

    # Uncomment the following if you are NOT using BDB tables
    #skip-bdb

    # Uncomment the following if you are using InnoDB tables
    #innodb_data_home_dir = /var/db/mysql/
    #innodb_data_file_path = ibdata1:10M:autoextend
    #innodb_log_group_home_dir = /var/db/mysql/
    #innodb_log_arch_dir = /var/db/mysql/
    # You can set .._buffer_pool_size up to 50 - 80 %
    # of RAM but beware of setting memory usage too high
    #innodb_buffer_pool_size = 16M
    #innodb_additional_mem_pool_size = 2M
    # Set .._log_file_size to 25 % of buffer pool size
    #innodb_log_file_size = 5M
    #innodb_log_buffer_size = 8M
    #innodb_flush_log_at_trx_commit = 2
    #innodb_lock_wait_timeout = 50

    [mysqldump]
    quick
    max_allowed_packet = 16M

    [mysql]
    no-auto-rehash
    # Remove the next comment character if you are not familiar with SQL
    #safe-updates

    [isamchk]
    key_buffer = 8M
    sort_buffer_size = 8M

    [myisamchk]
    key_buffer = 8M
    sort_buffer_size = 8M

    [mysqlhotcopy]
    interactive-timeout
    [root@bx4] /usr/ports/>

Посоветуйте, пожалуйста, где настраивать?
В интернете всё облазил ничего не нашёл :-(