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mysql Starting MySQL in Linux

The server quit without updating PID file. Here's how to solve it.

I found a bunch of methods from the Internet as follows:

1. The requested URL/data/rekfan.pid was not found on this server.

Solution:

Give permission to execute "chown -R mysql:mysql /var/data"

"chmod -R 755 /usr/local/mysql/data" and restart mysqld!

2. There may already be a mysql process in the process

Solution:

Use the command "ps -ef| grep mysqld"See if there is a mysqld process

If there is a kill using "kill -9 process number" then restart mysqld!

3. Probably the second time mysql is installed on the machine, there is residual data affecting the service startup

Solution:

Go to mysql data directory/data to see if mysql-bin.index exists

Remove it quickly, it is the culprit. I am using the third method to solve!

4.mysql uses the/etc/my.cnf configuration file when no configuration file is specified at startup

Please open this file to see if there is a specified data directory (datadir) under the [mysqld] section

Solution: Please set this line under [mysqld]: datadir = /usr/local/mysql/data

5.Skip-federated field problem

Solution: Check if there are any uncommented skip-federated fields in/etc/my.cnf file, and comment them out immediately if there are any.

6. Error log directory does not exist

Workaround: Use the "chown" "chmod" command to give mysql owner and permissions

7.Selinux caused trouble, if it is centos system, selinux will be turned on by default

Solution:

Close it, open/etc/selinux/config, change SELINUX=enforcing to SELINUX=disabled and save to exit and restart the machine

The requested URL/usr/local/mysql/data was not found on this server.

Problem solving should be permission problem, localhost.localdomain.pid file cannot be generated

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