Solve the problem that PHP cannot access remote mysql _ PHP Tutorial-php Tutorial

Solve the problem that PHP cannot access remote mysql. The remote server can be accessed remotely. The problem I encountered was as follows: there are three servers A, B, and C, and C is the server. B can use PHP to successfully connect to mysql on Machine C, remote servers can be accessed remotely.

The problem I encountered was: there are three servers A, B, and C, and C is the server. B can use PHP to successfully connect to mysql on Machine C, while machine A cannot connect!

It can be said that it is certainly not a problem with the code, and the mysql settings on the server are also OK, because the B server can all be used.

It must have been A problem with Machine A's settings!

I searched on the internet and found that mysql authorization problems, php. ini modification, and firewall modification were not actually caused by these problems.

Finally, I thought about the SELINUX problem. I compared the two AB machines and set them differently! It's probably a problem!

The following settings are made:

Root, use vim to open the file/etc/selinux/config

Modify the value of SELINUX:

# SELINUX = enforcing

SELINUX = disabled

Save and exit.

Restart takes effect. if you do not want to restart, enter the command line

Setenforce 0

Press enter, OK

Bytes. The problem I encountered was: there are three servers A, B, and C, and C is the server. B can use PHP to successfully connect to mysql on Machine C, while machine...