CentOS7 安装MySQL5.6

1.  检查是否有MariaDB和MySQL，如果有则卸载掉

 # rpm -qa | egrep "mariadb|mysql"
  mariadb-server-5.5.-.el7_5.x86_64
  mariadb-libs-5.5.-.el7_5.x86_64
  mariadb-5.5.-.el7_5.x86_64
  mariadb-devel-5.5.-.el7_5.x86_64
# rpm -e --nodeps mariadb-server-5.5. mariadb-libs-5.5. mariadb-5.5.-.el7_5.x86_64 mariadb-devel
# yum install autoconf -y

2. 下载MySQL5.6二进制安装包，选择（Linux-Generic）版

# wget https://cdn.mysql.com//Downloads/MySQL-5.6/mysql-5.6.42-linux-glibc2.12-x86_64.tar.gz

3. 解压到/usr/local中改名，并创建软链接

# tar xf mysql-5.6.-linux-glibc2.-x86_64.tar.gz  -C /usr/local/# mv /usr/local/mysql-5.6.-linux-glibc2.-x86_64 /usr/local/mysql-5.6.# ln -s /usr/local/mysql-5.6./ /usr/local/mysql
# ll /usr/local/
  total
  drwxr-xr-x.   root root     Apr    bin
  drwxr-xr-x.   root root     Apr    etc
  drwxr-xr-x.   root root     Apr    games
  drwxr-xr-x.   root root     Apr    include
  drwxr-xr-x.   root root     Apr    lib
  drwxr-xr-x.   root root     Apr    lib64
  drwxr-xr-x.   root root     Apr    libexec
  lrwxrwxrwx    root root    Nov  : mysql -> /usr/local/mysql-5.6./
  drwxr-xr-x   root root  Nov  : mysql-5.6.
  drwxr-xr-x.   root root     Apr    sbin
  drwxr-xr-x.   root root    Apr    share
  drwxr-xr-x.   root root     Apr    src

4. 创建用户组和用户名

# groupadd mysql
# useradd -g mysql mysql -s /sbin/nologin 

5. 修改配置文件

# cp /usr/local/mysql/support-files/my-default.cnf /etc/my.cnf
# mkdir /var/lib/mysql/
# chown -R mysql.mysql /var/lib/mysql
# cat /etc/my.cnf
[mysql]
default-character-set=utf8
[mysqld]
skip-name-resolve
port =
server_id =
log_bin = mysql-bin
socket=/var/lib/mysql/mysql.sock
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data
max_connections=
character-set-server=utf8
default-storage-engine=INNODB
lower_case_table_name=
max_allowed_packet=16M
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
[client]
socket  = /var/lib/mysql/mysql.sock

6. 进入mysql目录初始化数据

# chown mysql.mysql -R /usr/local/mysql
# cd /usr/local/mysql/scripts/
# ./mysql_install_db  --user=mysql  --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data

7. 配置环境变量

# echo "MYSQL_HOME=/usr/local/mysql" >>/etc/profile
# echo "PATH=$PATH:$MYSQL_HOME/bin" >> /etc/profile
# source /etc/profile

8. 启动MySQL，并设置开机自启

# cp /usr/local/mysql/support-files/mysql.server /etc/rc.d/init.d/mysqld
# chkconfig --add mysqld
# chkconfig mysqld on
# /etc/init.d/mysqld start

9. 设置数据库登录密码

# mysqladmin -uroot password ''

10. 登录数据库删除无用的帐号

# mysql -uroot -p''
  mysql> delete from mysql.user where user='';
  Query OK,  rows affected (0.00 sec)

  mysql> delete from mysql.user where host='::1';
  Query OK,  row affected (0.00 sec)
  mysql> select user,host from mysql.user;
  +------+----------------------------+
  | user | host                       |
  +------+----------------------------+
  | root | 127.0.0.1                  |
  | root | ---77               |
  | root | localhost                  |
  +------+----------------------------+
 rows in set (0.00 sec)