MySQL server start issues on Mavericks

Question

I am having difficulty using MySQL on my MacBook, I am trying to start my server using sudo mysqld_safe and this results in the following output:

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Answer 1

If you don't have any important data, the easiest would be to reinstall MariaDB from scratch (otherwise skip this step), e.g.

mv /usr/local/var/mysql /usr/local/var/mysql.bak
brew reinstall mariadb

Then fix the permissions by:

sudo chmod -R u+rwX,g+rwX,o-rwx /usr/local/var/mysql
sudo chown -R $USER:_mysql /usr/local/var/mysql

Restart MariaDB services by:

brew services restart mariadb

Consider configuring your MariaDB credentials by running:

mysql_secure_installation

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Troubleshooting

• In case it still doesn't work, check the logs for any further issues by:

  tail /usr/local/var/mysql/*.err
  

• For example check if in old config file consist any invalid settings, as they may be not supported anymore.

Answer 2

i fixed that by simply delete the ".err" file. Somehow the error log owned by "_mysql" and prevent mysqld zu start.

Answer 3

In my case I had a similar problem on Mac OS 10.10 Yosemite. For some reason when I killed the mysql process manually it changed the ownership of the error log file /usr/local/var/mysql/rally.local.err to _mysql instead of caleb. Unlike the accepted solution above, the whole rest of my directory is owned by caleb, not _mysql.

I fixed it by running sudo chown caleb /usr/local/var/mysql/rally.local.err

For the record I guess the proper way to stop and start the mysql server in Yosemite is with /usr/local/var/mysql/mysql.server start|stop|restart.

Answer 4

File permissions are definitely the cause of the issue. There are far better experts than me, but I recommend the following:

Ensure your entire data directory is owned by the _mysql user with permissions drwxr-xr-x.

In your case, it appears that your MySQL installation directory is your data directory. My data directory is in a subdirectory of the installation directory.

You can probably get up and running by changing permissions per the command:

sudo chown -R _mysql:admin /usr/local/var/mysql
sudo chmod -R u+rwX,g+rwX,o-rwx /usr/local/var/mysql

This may limit your dave account from accessing the mysql installation directory without sudo, so you may wish to tweak these permissions to include g+rwx if your dave user is a member of the admin group, which it appears to be. That tweak would be accomplished with:

sudo chmod -R g+rwx /usr/local/var/mysql