centos mysql 설치 문제

yum -y install pcre-devel lua-devel libxml2-devel ncurses-devel zlib zlib devel curl openssl openssl-devel libtermcap-devel libc-client-devel bison gcc g++ cpp gcc-c++ freetype freetype-devel freetype-utils gd gd-devel libjpeg libjpeg-devel libpng libpng-devel curl curl-devel flex php-mbstring libexif-devel cmake

yum update

adduser -M -s /bin/false mysql

cd /home
mkdir mysql
cd mysql
mkdir data
mkdir log
chown mysql:mysql data
chown mysql:mysql log

drwxr-xr-x. 2 mysql mysql 4096 2015-11-20 23:32 data
drwxr-xr-x. 2 mysql mysql 4096 2015-11-20 23:32 log

cmake -DCMAKE_INSTALL_PREFIX=/usr/local/mysql-5.7.9 -DMYSQL_DATADIR=/home/mysql/data -DDEFAULT_CHARSET=euckr -DDEFAULT_COLLATION=euckr_korean_ci -DWITH_EXTRA_CHARSETS=all -DDOWNLOAD_BOOST=1 -DWITH_BOOST=/usr/local/boost

make && make install

ln -s /usr/local/mysql-5.7.9 /usr/local/mysql

chown -R mysql:mysql mysql-5.7.9

cd /home

chown -R mysql:mysql mysql

cd /usr/local/mysql/support-files

cp my-default.cnf /etc/my.cnf

cd /usr/local/mysql/bin

./mysqld --initialize --user=mysql --datadir=/home/mysql/data

./mysqld_safe &

ps -ef | grep mysql

./bin/mysqladmin -u root password 1234

위와 같은 과정으로 설치했습니다.

하지만 데몬 구동 후에

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
위와 같은 오류가 발생합니다. ㅠㅠ