Beta Branch centos 6 maraidb error log & logrotation in 123.09beta01

centos 6 maraidb error log & logrotation in 123.09beta01

MariaDB 10.0.29+ and 10.1.21+ changed the way mysql log-error is setup by mysqld_safe. The mysqld_safe prior to those versions use to create the defined log-error file and chown mysql user permissions to it i.e. if you set in /etc/my.cnf log-error=/var/log/mysqld.log, mysqld_safe would chown the /var/log/mysqld.log file with apprioriate permssions for mysql user. The latest MariaDB versions removed the chown ability due to a potential security issue of being able to change permission of root owned files to whatever you want. So it's up to MariaDB end users to create the log-error defined mysql error log with the appropriate permissions yourself. This update does just that manual creates /var/log/mysqld.log error log and chown to mysql user and group ownership with 640 file permissions. The update also sets up apprioriate updated mysql logrotation config files /etc/logrotate.d/mysql and /etc/logrotate.d/mysql-slowlog to ensure proper log rotation with the mysql user/group ownership and 640 file permissions. This issue comes up for CentOS 6 and prevents MariaDB mysql server from starting up with MariaDB 10.0.29+ and 10.1.21+ so the committed fixes allow you set in /etc/my.cnf log-error=/var/log/mysqld.log and start up MariaDB mysql server properly.

This doesn't really affect CentOS 7 as MariaDB on CentOS 7 uses systemd and mysql error logging is done via journalctl instead via command

Code (Text):

journalctl -u mariadb --no-pager

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123.09beta01 branch

• Branch: https://github.com/centminmod/centminmod/tree/123.09beta01
• Commit History: https://github.com/centminmod/centminmod/commits/123.09beta01

 

manual test of new mysql logrotation

Code (Text):

logrotate -d /etc/logrotate.d/mysql
reading config file /etc/logrotate.d/mysql
reading config info for /var/log/mysqld.log 

Handling 1 logs

rotating pattern: /var/log/mysqld.log  after 1 days (8 rotations)
empty log files are not rotated, log files >= 0 are rotated earlier, old logs are removed
considering log /var/log/mysqld.log
  log does not need rotating
not running postrotate script, since no logs were rotated

 

For specifics of mysqld_safe changes in 10.0.29+ & 10.1.21+ [MDEV-11841] mysqld_safe_helper: Can't create/write to file '/var/log/mysqld.log' - JIRA

 

And more info related to the changes at Security Vulnerability CVE-2016-6664 / CVE-2016-5617 | MariaDB