mysql: however file don't exists. Create writable for user 'mysql'.

第一次启动mysql5.7时,报错.

[root@test2 my57_3307]# /usr/local/mysql57/bin/mysqld_safe  --defaults-file=/dbdata/mysql/my57_3307/my57_3307.cnf  --ledir=/usr/local/mysql57/bin
2018-08-26T14:12:45.459798Z mysqld_safe error: log-error set to '/var/log/mysqld/my57_3307.log', however file don't exists. Create writable for user 'mysql'.

问题出在alert日志上.参数指定的日志文件不存在,那是必然的,因为是第一次启动,奇怪在mysql不会创建alert log...暂时没找到问题所在.

直接创建个空的日志文件,并启动,问题解决.

[root@test2 my57_3307]# touch /var/log/mysqld/my57_3307.log
[root@test2 my57_3307]# chown mysql /var/log/mysqld/my57_3307.log
[root@test2 my57_3307]# /usr/local/mysql57/bin/mysqld_safe  --defaults-file=/dbdata/mysql/my57_3307/my57_3307.cnf  --ledir=/usr/local/mysql57/bin
2018-08-26T14:13:54.454508Z mysqld_safe Logging to '/var/log/mysqld/my57_3307.log'.
2018-08-26T14:13:54.482116Z mysqld_safe Starting mysqld daemon with databases from /dbdata/mysql/my57_3307/data

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