What is the difference between starting mysql via chkconfig and mysqld_safe?

Posted on 2009-07-10
Medium Priority
Last Modified: 2012-05-07

I am noticing mysqld spontaneously stopping after a few minutes without logging any errors when i start it via $ service mysqld start. When I start it via $ mysqld_safe --user=mysql it seems to run fine. I noticed in /etc/init.d/mysql that this:

get_mysql_option mysqld datadir "/var/lib/mysql"

This is not the location of my datadir. Is this the problem? Do I need to customize the init script? Why isn't this init script using my values from /etc/my.cnf?

Question by:tomp_gl
1 Comment
LVL 61

Accepted Solution

Kevin Cross earned 2000 total points
ID: 24832502
mysqld_safe AFAIK is the recommended way to start MySQL instance on Netware and according to manual it is so for Linux: http://dev.mysql.com/doc/refman/5.1/en/mysqld-safe.html.

However, you are starting mysql should read the my.cnf file; however, any options specified as arguments to the start command will override what is the in the cnf file.  Therefore, the datadir "/var/lib/mysql" is overriding the correct value that is in your my.cnf.

Try changing to this:
get_mysql_option mysqld

And see if you have the same issues.  That is most likely the issue if that directory is invalid.  The fact that you are not starting with mysqld_safe is why you are not getting log of error causing the shutdown.  Moreover, if you note in your $ mysqld_safe --user=mysql method of starting datadir is not specified.  If you tried $ mysqld_safe --user=mysql --datadir="/var/lib/mysql" you may get the same symptom.


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