for my two containers:
Container 1:
- name: boxoffice
- containerPort : 80
- hostPort: 3030
- service installed : apache2 and php
command run container 1:
docker run --name=boxoffice -p 3030:80 -v /Users/mac/Desktop/storage-web:/var/www/app -d --link=db medoneapache:latest
Container 2:
- name: db
- containerPort : 3306
- hostPort: 3306
- service installed : mysql
command run container 2:
docker run --name=db -p 3306:3306 -v /Users/mac/Desktop/storage-db:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=medone -d mysqlmedone:1.0
i linked the first container "boxoffice" to the second container "db" via --link=db
and i create a php file to test the mysql connection that having a database called : profil
connection-php-mysql.php (/var/www/app) in "boxoffice" container:
<?php
$servername = "db";
$username = "root";
$password = "medone";
// Create connection
$conn = mysqli_connect($servername, $username, $password);
// Check connection
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}
echo "Connected successfully";
?>
Here is the error that i got :
Warning: mysqli_connect(): The server requested authentication method unknown to the client [caching_sha2_password] in /var/www/app/index.php on line 7
Warning: mysqli_connect(): (HY000/2054): The server requested authentication method unknown to the client in /var/www/app/index.php on line 7 Connection failed: The server requested authentication method unknown to the client
i inspected the first container to get the host ip address : 172.17.0.2 and replaced it with db as servername but i got the same error
and i can't get the username as root getting the error:
mysql -u root
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
You need to upgrade to PHP 7.4.4.
The support for caching_sha2_password has been added both in mysqli and PDO only in PHP 7.4.4.
The relevant feature-request: https://bugs.php.net/bug.php?id=79275
The GitHub PR: https://github.com/php/php-src/pull/5210