Do not quit install phpmyadmin in docker, what to do?

Question

PHP

I'm trying to install phpmyadmin with docker, it fails to connect to the network.
Error: mysqli:: real_connect
(): (HY000/1130): Host '172.**.*.*' is not allowed to connect to this MySQL server

# For more information: https://laravel.com/docs/sail
version: '3'
services:
    laravel.test:
        build:
            context: ./vendor/laravel/sail/runtimes/8.1
            dockerfile: Dockerfile
            args:
                WWWGROUP: '${WWWGROUP}'
        image: sail-8.1/app
        extra_hosts:
            - 'host.docker.internal:host-gateway'
        ports:
            - '${APP_PORT:-80}:80'
        environment:
            WWWUSER: '${WWWUSER}'
            LARAVEL_SAIL: 1
            XDEBUG_MODE: '${SAIL_XDEBUG_MODE:-off}'
            XDEBUG_CONFIG: '${SAIL_XDEBUG_CONFIG:-client_host=host.docker.internal}'
        volumes:
            - '.:/var/www/html'
        networks:
            - sail
        depends_on:
            - mysql
            - redis
            - meilisearch
            - selenium
    mysql:
        image: 'mysql/mysql-server:8.0'
        ports:
            - '${FORWARD_DB_PORT:-3306}:3306'
        environment:
            MYSQL_ROOT_PASSWORD: '${DB_PASSWORD}'
            MYSQL_ROOT_HOST: "%"
            MYSQL_DATABASE: '${DB_DATABASE}'
            MYSQL_USER: '${DB_USERNAME}'
            MYSQL_PASSWORD: '${DB_PASSWORD}'
            MYSQL_ALLOW_EMPTY_PASSWORD: 1
        volumes:
            - 'sailmysql:/var/lib/mysql'
        networks:
            - sail
        healthcheck:
            test: ["CMD", "mysqladmin", "ping", "-p${DB_PASSWORD}"]
            retries: 3
            timeout: 5s
    phpmyadmin:
        image: phpmyadmin/phpmyadmin
        ports:
            - 8080:80
        environment:
            MYSQL_USERNAME: "${DB_USERNAME}"
            MYSQL_ROOT_PASSWORD: "${DB_PASSWORD}"
            PMA_HOST: mysql
        networks:
            - sail
    redis:
        image: 'redis:alpine'
        ports:
            - '${FORWARD_REDIS_PORT:-6379}:6379'
        volumes:
            - 'sailredis:/data'
        networks:
            - sail
        healthcheck:
            test: ["CMD", "redis-cli", "ping"]
            retries: 3
            timeout: 5s
    meilisearch:
        image: 'getmeili/meilisearch:latest'
        platform: linux/x86_64
        ports:
            - '${FORWARD_MEILISEARCH_PORT:-7700}:7700'
        volumes:
            - 'sailmeilisearch:/data.ms'
        networks:
            - sail
        healthcheck:
            test: ["CMD", "wget", "--no-verbose", "--spider",  "http://localhost:7700/health"]
            retries: 3
            timeout: 5s
    mailhog:
        image: 'mailhog/mailhog:latest'
        ports:
            - '${FORWARD_MAILHOG_PORT:-1025}:1025'
            - '${FORWARD_MAILHOG_DASHBOARD_PORT:-8025}:8025'
        networks:
            - sail
    selenium:
        image: 'selenium/standalone-chrome'
        volumes:
            - '/dev/shm:/dev/shm'
        networks:
            - sail
networks:
    sail:
        driver: bridge
volumes:
    sailmysql:
        driver: local
    sailredis:
        driver: local
    sailmeilisearch:
        driver: local

Answer 1

Go to mysql container: docker-compose exec mysql bash
Connect to MySQL.
Look what's in the user table: Make sure the host is really "%". If not, then either do "%". Or create a separate user.
SELECT User,Host,Password,plugin FROM mysql.user;