Job for mysqld.service failed in Centos 7

Question

OS:Centos 7 Linux 3.10.0-229.el7.x86_64

MySQL: mysql57-community-release-el7-7.noarch.rpm

I installed MySQL server

Answer 1

For me the above answer did not help, so here is my solution.

Find out open mysqld process

ps -ef | grep mysqld

And kill all those process

pkill -9 mysqld

Finally start it the same by using

systemctl start mariadb

Issue resolved....

Answer 2

Check below things to fix the issue

1. Check the permission of mysql data dir using below command. The ownership should be mysql:mysql and the directory permission should be 700

   # ls -ld /var/lib/mysql/

2. Check the permission of databases inside mysql data dir using below command. The ownership should be mysql:mysql for all the files inside that directory

   # ls -lh /var/lib/mysql/

3. Check the listening network tcp ports using below command

   # netstat -ntlp

4. Check the mysql log files for any error using below command.

   # cat /var/log/mysql/mysqld.log

5. Try to start mysql using below command

   # mysqld_safe --defaults-file=/etc/my.cf