CentOS7MySql5.6.39安装

1.检查系统是否安装了mariadb

rpm -qa | grep mariadb

发现已经安装，卸载

rpm -e --nodeps mariadb-libs-5.5.52-1.el7.x86_64

2.创建mysql用户组

groupadd mysql

useradd -g mysql mysql

tar -zxvf mysql-5.6.39-linux-glibc2.12-x86_64.tar.gz

mv 解压出来的文件夹名 /usr/local/mysql

cp my-default.cnf /etc/my.cnf

3.my.cnf编辑

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html
# *** DO NOT EDIT THIS FILE. It's a template which will be copied to the
# *** default location during install, and will be replaced if you
# *** upgrade to a newer version of MySQL.
[mysql]
default-character-set=utf8
socket=/var/lib/mysql/mysql.sock

[mysqld]

# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M

# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin

# These are commonly set, remove the # and set as required.
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data
port=3306
server_id=1
socket=/var/lib/mysql/mysql.sock
max_cOnnections=200
character-set-server=utf8
default-storage-engine=INNODB
lower_case_table_name=1
max_allowed_packet=16M

# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M 

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES 

mkdir /var/lib/mysql

yum install -y perl-Data-Dumper

./scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data/

chown -R mysql:mysql data

chown 777 /etc/my.cnf

cp ./support-files/mysql.server /etc/rc.d/init.d/mysqld

chmod +x /etc/rc.d/init.d/mysqld

chkconfig --add mysqld

chkconfig --list mysqld

mysql -uroot -p
没有密码直接回车
use mysql;
update user set password=password('root') where user='root' and host='localhost';
flush privileges;
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root' WITH GRANT OPTION;
flush privileges;