Centos8 creates wordpress+mysql error reports according to the official website of docker

The article of this film is the last

The operating system is centos8, Better not use this .
And then according to Official website installation wordpress course do , Exactly the same as , Visit the website after installation .

Error establishing a database connection.

I can't find a lot of solutions on the Internet , Used to docker-compose up -d Starting up , So you can't see the error , use docker-compose up After starting , You can see the error prompt

If you encounter the same problem, you can refer to This web site , Many people inside gave advice .
1、 First determine centos Whether the port of is open , Reference resources This
2、
I changed it wordpress Under the container wp-config.php The file is successful .
Refer to the following screenshot , But change it directly wp-config file , After restarting the container, it will become and docker-compose The file is the same , In the figure below, the author also said that this is not a good solution , It's better to change docker-compose Document bar . See the original text for details .

The gateway address in the figure can be obtained through the following command .

The gateway address is used here , no need ip Address .
It's over wp-config.php After that, it is easy or docker service , It will take effect directly . restart docker It changed back .

Postscript ：

After understanding , I think it's my computer , Official website docker-compose The document must be ok , I can use the official website now , But I'm not sure what caused the mistake in the first place . Maybe some of these attempts lead to the normal operation of the current .

If this error occurs , The first firewall Stop , Then restart docker service , Or change the mount directory , Recreate docker-compose up -d once , It may also be a problem with the previous configuration .

1、sudo systemctl disable firewalld
2、systemctl restart docker

About why to change db Just look for the gateway This blog .