MySQL Daemon Failed to Start - centos 6

Question

EDIT: Look at the checkmarked answer comments to get your issue solved.

Whenever I try to start the SQLD service I get MySQL Daemon Failed to Start. I infact tried

Answer 1

 /etc/init.d/mysqld stop

 mysqld_safe --skip-grant-tables & mysql_upgrade

 /etc/init.d/mysqld stop

 /etc/init.d/mysqld start

Answer 2

The most likely cause for this error is that your mysql server is not running. When you type in mysql you are executing mysql client.

Try:

# sudo service mysql start
# mysql

Update (after OP included log in the question; taken from the comments below):

Thanks, saw your log. The log is saying the mysql user doesn't have proper access rights. I'm assuming your mysql user is mysql(this can be verified in /etc/my.cnf, execute

chown -R mysql:mysql /var/lib/mysql

and try starting mysqld again.

Answer 3

I had the same issue happening. When I checked the error.log I found that my disk was full.

Use:

df -h 

on the command line. it will tell you how much space you have left. mine was full. found my error.log file was 4.77GB. I downloaded it and then deleted it. Then I used service mysqld start and it worked.

Answer 4

For those who will be here in the future, if all above methods are not working, check the my.cnf file by:

$ sudo gedit /etc/my.cnf

Find the line start with:

bind-address=[an-IP-address]

Check if the IP address after the equal sign is correct. If you don't even know what the IP is, just use localhost, then you can only connect to MySQL inside the same host.

If you want to connect to MySQL remotely, you should actually comment out that line entirely, then it will listen on all IPs and ports which you need because you will be connecting remotely to it over public IPv4.

After that add a user to access your database such as:

mysql> GRANT ALL ON database_name.* TO user@xx.xxx.xx.xx IDENTIFIED BY 'your_password';

Replace xx.xx.xx.xx with your local IP address of your laptop/desktop or if it is dynamic you can add them either by: '192.168.0.%' as a dynamic C-class or '%' if you want to be able to connect from anywhere (this is less secure)

Also, if there's a firewall installed, one should open the port on the firewall;

For example in Ubuntu:

sudo ufw allow 3306/tcp
sudo service ufw restart

Now, check if the service is startable by:

$ sudo service mysqld start

Answer 5

It may be a permission issue,

Please try the following command /etc/init.d/mysqld start as root user.

Answer 6

Reference here 2.10.2.1 Troubleshooting Problems Starting the MySQL Server.

1.Find the data directory ,it was configured in my.cnf.

[mysqld]
datadir=/var/lib/mysql

2. Check the err file,it log the error message about why mysql server start failed. the name of err file is related with your hostname.

cd /var/lib/mysql
ll
tail (hostname).err

3.If you find some messages like :

InnoDB: Error: log file ./ib_logfile0 is of different size 0 33554432 bytes
InnoDB: than specified in the .cnf file 0 5242880 bytes!
170513 14:25:22 [ERROR] Plugin 'InnoDB' init function returned error.
170513 14:25:22 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
170513 14:25:22 [ERROR] Unknown/unsupported storage engine: InnoDB
170513 14:25:22 [ERROR] Aborting

then

delete ib_logfile0 and ib_logfile1

, then,

/etc/init.d/mysqld start