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i'm trying to change the datadir in mysql, i created a new directory with the user mysql as a owner, i know am not supposed to set the permission to 777. but even with this full permission still getting the same error in the log file whenever i try to start the mysql service.

[InnoDB] The innodb_system data file 'ibdata1' must be writable

user@user:~$ ls -l /database2/mysql | grep ibdata1 
-rwxrwxrwx 1 mysql mysql 12582912 Jan 15 15:24 ibdata1

any solution ?

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  • Are /database2 and /database2/mysql accessible to the mysql user? – mustaccio Jan 15 at 16:11
  • @mustaccio yes, both are owned by the mysql user. – Someone Jan 15 at 16:19
  • And both directories are at least dr-x------? – Rick James Jan 15 at 18:06
  • @RickJames yes, drwxr-xr-x 3 mysql mysql 4096 Jan 15 17:10 database2 – Someone Jan 15 at 18:26
  • @Someone - What OS? Is /database2 mounted? Is SELINUX in effect? – Rick James Jan 15 at 18:30
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After reading this article and getting a main idea about SELinux and Apparmor i have finally managed to solve the issue. The solution was adding the new path of my new datadir in /etc/apparmor.d/usr.sbin.mysqld like this:

/database2/ r,
/database2/** rwk,

Now restart the apparmor service and start the mysql service.

sudo systemctl restart apparmor
sudo systemclt start mysql

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