[ERROR] The data directory needs to be specified.
3、生成授权表/opt/modules/mysql/bin mysql_install_db
执行： ./mysql_install_db --user=mysql
报错：
1、 The data directory needs to be specified.
指定了数据目录 --datadir=/opt/modules/mysql/data/
继续报错：The data directory '/opt/modules/mysql/data/' already exist and is not empty.
改回之前，完整的报错：
mysql_install_db is deprecated.Please consider switching to mysqld --initialize
The data directory needs to be specified.
大概意思： mysql_install_db 已经不再推荐使用了，建议改成 mysqld –initialize 完成实例初始化
改为：./mysqld --user=mysql --datadir=/opt/modules/mysql/data/ --basedir=/opt/modules/mysql
有报错
Could not create unix socket lock file /var/lib/mysql/mysql.sock.lock.
Unable to setup unix socket lock file.
Aborting
目录不存在或者权限不足，所以我们直接使用命令
mkdir -p /var/log/mysql/ 创建目录
chown -R mysql:mysql /var/log/mysql/ 设置权限
重新执行：./mysqld --user=mysql --datadir=/opt/modules/mysql/data/ --basedir=/opt/modules/mysql
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