Ubuntu Lamp accessing mysql from outside

I installed this LAMP: https://github.com/teddysun/lamp

Everything is perfectly setup, I still have to access mysql from outside, I was expecting to find the usual bind-address in mysql config file:

[mysqld]
bind-address = 127.0.0.1

In looking inside the /etc/my.cnf I cannot find any bind-address variable.

I've checked as well into /etc/mysql/my.cnf /usr/etc/my.cnf ~/.my.cnf but the are all not-existent file.

Edit

This is the full config:

[mysql]

# CLIENT #

port                           = 3306
socket                         = /tmp/mysql.sock

[mysqld]

# GENERAL #
port                           = 3306
user                           = mysql
default-storage-engine         = InnoDB
socket                         = /tmp/mysql.sock

pid-file                       = /usr/local/mysql/data/mysql.pid
skip-name-resolve
skip-external-locking

# MyISAM #
key-buffer-size                = 32M

# INNODB #
innodb-log-files-in-group      = 2
innodb-log-file-size           = 64M

innodb-flush-log-at-trx-commit = 2
innodb-file-per-table          = 1
innodb-buffer-pool-size        = 256M

# CACHES AND LIMITS #
tmp-table-size                 = 32M
max-heap-table-size            = 32M
query-cache-type               = 0
query-cache-size               = 0
max-connections                = 256

thread-cache-size              = 50
open-files-limit               = 1024
table-open-cache               = 400


# SAFETY #
max-allowed-packet             = 16M
max-connect-errors             = 1000000

# DATA STORAGE #

datadir                        = /usr/local/mysql/data

# LOGGING #
log-error                      = /usr/local/mysql/data/mysql-error.log

Is there a specific/different setup for this LAMP script?

Answer

When not specifically defined the bind-address defaults to *

If the address is *, the server accepts TCP/IP connections on all server host IPv6 and IPv4 interfaces if the server host supports IPv6, or accepts TCP/IP connections on all IPv4 addresses otherwise. Use this address to permit both IPv4 and IPv6 connections on all server interfaces. This value is the default.