docker有关phpmyadmin

Question

我正在使用官方映像（php-apache，mariadb，phpmyadmin，portainer）在linux上创建docker compose
运行良好
http://localhost:80（对于应用程序）
http://localhost:9000（面向讲师）
http://localhost:8080/（对于phpmyadmin）

但是要通过phpmyadmin访问数据库，我会收到错误消息

mysqli_real_connect(): (HY000/2002): php_network_getaddresses: 
getaddrinfo failed: Name or service not known 

另一个错误

mysqli_real_connect(): php_network_getaddresses: getaddrinfo failed: Name or service not known

您能帮我找到解决方法吗？或有什么主意吗？
非常感谢您的回复

$ docker-compose ps

Name                       Command               State           Ports
----------------------------------------------------------------------------------------
docker-test_apache       docker-php-entrypoint apac ...   Up      0.0.0.0:80->80/tcp
docker-test_mariadb      docker-entrypoint.sh --def ...   Up      3306/tcp
docker-test_phpmyadmin   /docker-entrypoint.sh apac ...   Up      0.0.0.0:8080->80/tcp
docker-test_portainer    /portainer -H unix:///var/ ...   Up      0.0.0.0:9000->9000/tcp

$ docker network ls

NETWORK ID          NAME                                DRIVER              SCOPE
07be9d66e300        bridge                              bridge              local
be235ccb569f        docker-test_apache                  bridge              local
eb025bc3e669        docker-test_backend                 bridge              local
cbcba6b521e3        docker-test_default                 bridge              local
415a1080b450        docker-test_frontend                bridge              local
e0a2e124f216        docker-test_mariadb                 bridge              local
28e3d3b445f5        docker-test_phpmyadmin              bridge              local
01d4e444e990        host                                host                local
9f4704eece00        none                                null                local

$ docker日志docker-test_phpmyadmin

phpMyAdmin not found in /var/www/html - copying now...
Complete! phpMyAdmin has been successfully copied to /var/www/html
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.25.0.2. Set the 'ServerName' directive globally to suppress this message
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.25.0.2. Set the 'ServerName' directive globally to suppress this message

我的docker-compose.yml

version: '3.7'
  services:
    apache:
      container_name: docker-test_apache
      ports:
        - 80:80
      environment:
        - APACHE_DOCUMENT_ROOT=${APACHE_DOCUMENT_ROOT}
      build:
        context: .
      volumes:
        - .:/var/www/html/
        - ./.docker/config/vhosts.conf:/etc/apache2/sites-available/000-default.conf
  #      - cache:/var/www/html/app/var/cache
  #      - log:/var/www/html/app/var/log
      networks:
        - apache

    mariadb:
      container_name: docker-test_mariadb
      image: mariadb:10.2
      environment:
        MYSQL_ROOT_PASSWORD: root
        MYSQL_DATABASE: sf-test
        MYSQL_USER: root
        MYSQL_PASSWORD: root
        MYSQL_TCP_PORT: 3306
      command: --default-authentication-plugin=mysql_native_password
      networks:
        - mariadb
      restart: always

    phpmyadmin:
      container_name: docker-test_phpmyadmin
      image: phpmyadmin/phpmyadmin:latest
      environment:
        PMA_HOST: mariadb
      depends_on:
        - mariadb
      ports:
        - 8080:80
      restart: always
      networks:
        - phpmyadmin

    portainer:
      image: portainer/portainer:latest
      container_name: docker-test_portainer
      command: -H unix:///var/run/docker.sock
      restart: always
      ports:
        - 9000:9000
      volumes:
        - /var/run/docker.sock:/var/run/docker.sock
        - .docker/portainer:/data

  networks:
    apache:
    mariadb:
    phpmyadmin:

  volumes:
    cache:
    log:
    portainer_data: