php cannot connect to mysql in docker-compose - mysql

Question

Here is my docker-compose
version: '2'
services:
nginx:
image: nginx:1.11.8-alpine
ports:
- "8081:80"
volumes:
- ./code:/usr/share/nginx/html
- ./html:/myapp
- ./site.conf:/etc/nginx/conf.d/site.conf
- ./default.conf:/etc/nginx/conf.d/default.conf
- ./error.log:/var/log/nginx/error.log
- ./nginx.conf:/etc/nginx/nginx.conf
links:
- phpfpm
phpfpm:
image: php7-fpm:latest
ports:
- "9000:9000"
volumes:
- ./code:/usr/share/nginx/html
links:
- db_mysql
db_mysql:
image: mysql:5.7.17
volumes:
- db_data:/var/lib/mysql
# restart: no
ports:
- "3306:3306"
environment:
MYSQL_ROOT_PASSWORD: root
MYSQL_DATABASE: wp2017
MYSQL_USER: wp
MYSQL_PASSWORD: wp2017
volumes:
db_data:
Here is how I build my own php7-fpm:lastest
FROM php:7.1-fpm-alpine
RUN docker-php-ext-install mysqli
I cannot connect to mysql container
$serverName = 'localhost';
$userName = 'wp';
$password = 'wp2017';
$dbName = 'wp2017';
$link = mysqli_connect($serverName, $userName, $password, $dbName);
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
I always get error: "
Warning: mysqli_connect(): (HY000/2002): No such file or directory in /usr/share/nginx/html/db.php on line 8
Connect failed: No such file or directory"
Where I run command
sudo netstat -tulpn | grep :3306
I get this
tcp6 0 0 :::3306 :::* LISTEN 15362/docker-proxy
Please help !

Answer 1

Change PHP script
$serverName = 'db_mysql';
It will work.