Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Fixed
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5.5.45, 10.0.21, 10.1.6
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None
Description
The mysql.server init script doesn't check all server configuration groups. This happens because it uses the following arguments to "my_print_defaults":
/usr/bin/my_print_defaults mysqld server mysql_server mysql.server
This causes a problem because the mysql.server script needs to use some of the server configuration options, such as datadir.
For example, let's say we have the following configuration file:
$ cat /etc/my.cnf.d/server.cnf
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#
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# These groups are read by MariaDB server.
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# Use it for options that only the server (but not clients) should see
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#
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# See the examples of server my.cnf files in /usr/share/mysql/
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#
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# this is read by the standalone daemon and embedded servers
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[server]
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# this is only for the mysqld standalone daemon
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[mysqld]
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# this is only for embedded server
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[embedded]
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# This group is only read by MariaDB servers, not by MySQL.
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# If you use the same .cnf file for MySQL and MariaDB,
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# you can put MariaDB-only options here
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[mariadb]
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# This group is only read by MariaDB-10.0 servers.
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# If you use the same .cnf file for MariaDB of different versions,
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# use this group for options that older servers don't understand
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[mariadb-10.0]
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log_bin
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binlog_format=ROW
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server_id=1
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skip_name_resolve
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datadir=/exports/mysql
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What does my_print_defaults give us with the arguments that mysql.server uses? Nothing, because it doesn't check the mariadb-10.0 configuration group:
$ /usr/bin/my_print_defaults mysqld server mysql_server mysql.server
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If we instead use the --mysqld argument, then it finds the correct settings:
$ /usr/bin/my_print_defaults --mysqld
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--log_bin
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--binlog_format=ROW
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--server_id=1
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--skip_name_resolve
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--datadir=/exports/mysql
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A side-effect of this bug is that you can't set datadir in the mariadb-10.0 configuration group.
$ /usr/bin/my_print_defaults --mysqld | grep "datadir"
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--datadir=/exports/mysql
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$ sudo service mysql start
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Starting MySQL. SUCCESS!
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$ mysql -u root --execute="SHOW GLOBAL VARIABLES LIKE 'datadir'"
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+---------------+-----------------+
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| Variable_name | Value |
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+---------------+-----------------+
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| datadir | /var/lib/mysql/ |
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+---------------+-----------------+
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