[ERROR] The data directory needs to be specified.

admin

3、生成授权表

/opt/modules/mysql/bin   mysql_install_db
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执行： ./mysql_install_db --user=mysql
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( ~& T! ^7 D) x4 Y, ?# e报错：
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1、[ERROR]   The data directory needs to be specified.
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! ^/ P0 W3 h" T+ c4 y指定了数据目录 --datadir=/opt/modules/mysql/data/

5 W6 N1 _" [' C" A* D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：
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9 n( J/ K, y% U0 r1 N[WARNING]mysql_install_db is deprecated.Please consider switching to mysqld --initialize
[ERROR] The data directory needs to be specified.

+ E' {1 n$ c' N, F- I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
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改为：./mysqld --user=mysql --datadir=/opt/modules/mysql/data/ --basedir=/opt/modules/mysql
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有报错
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! X. s1 l- B6 ^1 _  b  j[ERROR] Could not create unix socket lock file /var/lib/mysql/mysql.sock.lock.
& J9 w- E( ]6 A4 \. }5 \8 u7 D) m; ~[ERROR] Unable to setup unix socket lock file.
[ERROR] Aborting

. d# g; J; X7 z# q9 @/ M4 @0 x目录不存在或者权限不足，所以我们直接使用命令
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mkdir -p /var/log/mysql/      创建目录

  s* U- |2 Y% L% O+ Zchown -R mysql:mysql /var/log/mysql/     设置权限

5 h$ b: `1 a+ h3 O1 X* \, Q重新执行：./mysqld --user=mysql --datadir=/opt/modules/mysql/data/ --basedir=/opt/modules/mysql