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I've installed MySQL 5.6 on a CentOS 7 server and I'm trying to change the error log location from the default /var/log/mysql.log to /var/log/mysqld.err. MySQL is running properly when I use the default file location, but the systemd service fails with err 13 - Permission Denied when I try to change the logfile location. I made sure to set the file access permissions and owner/group and restart the service with the following:

chown mysql:mysql /var/log/mysqld.err
chmod 640 /var/log/mysqld.err
systemctl daemon-reload
systemctl restart mysql

but the mysqld service still fails with the Permission Denied error when it tries to log output into /var/log/mysqld.err.

I've even tried setting the file access permissions on /var/log/mysqld.err to 777. In this case, the mysqld_safe script was able to write to the logfile successfully when I ran it manually, but the systemd service still fails even though I allowed any user to edit the file.

Are there settings other than file access rights and owner/group settings that limit what files a systemd service can access? As a side note, I have made no modifications to the service script that is installed from the MySQL repo, nor have I added any overwrite files for the service.

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    Did you check SELinux permissions? If its log is hardcoded in an SELinux rule, you'd have to add an other for your new file. looking at the file /var/log/audit/audit.log for denied entries as well as checking what gives semanage fcontext --list |grep mysql would give some informations about this – A.B Apr 18 '18 at 16:50
  • And a complimentary chcon (before correction) or restorecon (once fixed) could help. chcon -v --reference=/var/log/mysql.log /var/log/mysqld.err – A.B Apr 18 '18 at 16:59
  • @A.B You were right about the SELinux permissions. Thanks for the help. – Copernicus Apr 18 '18 at 17:25
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A.B was correct about the problem being with the SELinux permissions. The new file needed a mysqld_log_t type. I fixed the issue by changing the type:

chcon -t mysqld_log_t /var/log/mysqld.err

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