CentOS 7 Program self-booting problem

MySQL specific installation method see http://www.cnblogs.com/yoyotl/p/5752437.html

However, more instructions are needed for the self-starter section.

First, the problem phenomenon:

After the system restarts, it is found that the MYSQLD service starts normally, but application a that relies on MySQL database fails to start.

The view log shows that the link database failed when program a started.

Second, reason analysis:

The MYSQLD service is started normally.

The manual restart program A,a also works correctly at this time.

Conclusion: When program a starts, mysqld may not start.

Third, the starting sequence

The first thing to think about is to adjust the boot order of the MYSQLD service so that it is higher than my program A.

However, there is no startup script for Mysqld found under the/ETC/INIT.D path.

Iv. the solution of the idea

Follow the link to indicate that the installed mysqld is automatically started by default.

You can cancel the Mysqld self-boot and then write a startup script to make sure it starts before program a starts.

V. Solutions

1. Check the system's current default startup Project method, no longer a setup.

Systemctl List-unit-files

Execute this command to view the service startup and service status of the current system.

The results are shown below:

1 ... 2 Microcode.service                            3 Mysql.service                                4 Mysqld.service                               5 networkmanager-dispatcher.service           6 ...

2. Cancel the mysqld self-boot

Systemctl Disable Mysqld

After executing the command, review the service status of the current system:

1 ... 2 Microcode.service                            3 mysqld.service                              Disabled4 networkmanager-dispatcher.service           5 ...

3. Custom/etc/rc.local

First Execute systemctl start mysqld

Re-execute Starta

Problem solving.

CentOS 7 Program self-booting problem