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MySQL error | Could not open file Permission denied:

Getting Error - Could not open file '/mysql/<db_name>/logs/<db_name>.err' for error logging: Permission denied:

If you are implementing systemctl to start, stop, and check status of mysqld and getting following error, while starting mysqld service, then check whether SeLinux is disabled or not.

mysqld[44278]: 2018-11-06T01:36:48.303642Z 0 [ERROR] [MY-010187] [Server] Could not open file '/mysql/<db_name>/logs/<db_name>.err' for error logging: Permission denied
mysqld[44278]: 2018-11-06T01:36:48.303785Z 0 [ERROR] [MY-010119] [Server] Aborting

Disable SeLinux:

Check whether SeLinux is enforcing or permissive
# getenforce
Enforcing

Edit file /etc/sysconfig/selinux and set SELINUX=permissive as follows and REBOOT server

# cat /etc/sysconfig/selinux
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
#SELINUX=enforcing
SELINUX=permissive
# SELINUXTYPE= can take one of three two values:
#     targeted - Targeted processes are protected,
#     minimum - Modification of targeted policy. Only selected processes are protected.
#     mls - Multi Level Security protection.
SELINUXTYPE=targeted

Execute following command to make sure SeLinux is permissive

#getenforce
Permissive

Explore more at -  

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/security-enhanced_linux/sect-security-enhanced_linux-working_with_selinux-changing_selinux_modes

 https://docs.fedoraproject.org/en-US/Fedora/11/html/Security-Enhanced_Linux/sect-Security-Enhanced_Linux-Working_with_SELinux-Enabling_and_Disabling_SELinux.html

If you like to configure SELINUX  and keep enforcing SELINUX - Explore it at https://blogs.oracle.com/jsmyth/selinux-and-mysql

If you have an access to Oracle - MOS -  Refer: How to set SELinux contexts for MySQL Server (Doc ID 2296123.1) to configure SELinux for MySQL database server.
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