Error 1045 mysql new installation on OSX 10.9.3

Question

after new mysql-5.7.4-m14-osx10.7-x86_64 installation,
I typed "/usr/local/mysql/bin/mysql" I got "ERROR 1045 (28000): Access denied for user 'username'@'localhost' (using password: NO)"
I type "ps auxww | grep mysql", I got"
_mysql            224   0.0  6.6  3188416 552216   ??  S     7:58pm   0:01.50 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=/usr/local/mysql/data/Dongs-MacBook-Pro.local.err --pid-file=/usr/local/mysql/data/Dongs-MacBook-Pro.local.pid --socket=/var/mysql/mysql.sock --port=8888
root               65   0.0  0.0  2461016   1064   ??  Ss    7:58pm   0:00.04 /bin/sh /usr/local/mysql/bin/mysqld_safe --user=mysql
dongzhong         594   0.0  0.0  2432784    604 s000  S+    8:56pm   0:00.00 grep mysql"
I type "sudo nano /Library/LaunchDaemons/com.mysql.mysql.plist", I got
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-$
<plist version="1.0">
  <dict>
    <key>KeepAlive</key>
    <true/>
    <key>Label</key>
    <string>com.mysql.mysqld</string>
    <key>ProgramArguments</key>
    <array>
    <string>/usr/local/mysql/bin/mysqld_safe</string>
    <string>--user=mysql</string>
    </array>
  </dict>
</plist>
I also have turned on my internet sharing but still access denial. Please help me

Answer 1

Take a look at this article. 
http://www.howtoforge.com/reset-forgotten-mysql-root-password
I tried this with mysql 5.7.4 (Milestone 14) and OS X 10.10 (Yosemite) and it works.  It should work on 10.9 too (though I haven't tried it on Mavericks).
5.7.4 installs with a randomly generated password for mysql root.  On Linux RPM installs, this initial password is stored in /etc/mysql/.mysqlsecret - which you are supposed to use for the initial login.  Couldn't find it's equivalent anywhere on OS X.  Will file a bug report with MySQL.