Docker: 无法连接到其他容器

Question

docker-compose.yml

version: '3'

volumes:
  wp-assets:

services:
  mariadb:
    build: ./requirements/mariadb
    environment:
      - MYSQL_ROOT_HOST=${MYSQL_ROOT_HOST}
      - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}
      - MYSQL_DATABASE=${MYSQL_DATABASE}
      - MYSQL_USER=${MYSQL_USER}
      - MYSQL_PASSWORD=${MYSQL_PASSWORD}

    ports:
      - "127.0.0.1:3306:3306"
      - "127.0.0.1:9999:9999" # test

  wordpress:
    environment:
      - WORDPRESS_DB_HOST=${WORDPRESS_DB_HOST}
      - WORDPRESS_DB_USER=${WORDPRESS_DB_USER}
      - WORDPRESS_DB_PASSWORD=${WORDPRESS_DB_PASSWORD}
      - WORDPRESS_DB_NAME=${WORDPRESS_DB_NAME}
      - WORDPRESS_TABLE_PREFIX=${WORDPRESS_TABLE_PREFIX}
      - WORDPRESS_AUTH_KEY=${WORDPRESS_AUTH_KEY}
      - WORDPRESS_SECURE_AUTH_KEY=${WORDPRESS_SECURE_AUTH_KEY}
      - WORDPRESS_LOGGED_IN_KEY=${WORDPRESS_LOGGED_IN_KEY}
      - WORDPRESS_NONCE_KEY=${WORDPRESS_NONCE_KEY}
      - WORDPRESS_AUTH_SALT=${WORDPRESS_AUTH_SALT}
      - WORDPRESS_SECURE_AUTH_SALT=${WORDPRESS_SECURE_AUTH_SALT}
      - WORDPRESS_LOGGED_IN_SALT=${WORDPRESS_LOGGED_IN_SALT}
      - WORDPRESS_NONCE_SALT=${WORDPRESS_NONCE_SALT}
    volumes:
      - wp-assets:/var/wp-assets
    build: ./requirements/wordpress
    ports:
      # host_port == 127.0.0.1:9000, allow only localhost
      - "127.0.0.1:9000:9000"

  nginx:
    #    image: nginx:latest
    depends_on: 
      - wordpress
    volumes:
      - wp-assets:/var/wp-assets
    build: ./requirements/nginx
    ports:
      # host_port == 0.0.0.0:8080, allow all interfaces
      - "8080:80"

mariadb/Dockerfile

FROM debian:buster

# install mariadb-server
RUN apt update && apt install -y mariadb-server

# allow connection from wordpress (host name)
RUN sed -e 's/127.0.0.1/wordpress/' \
        -i '/etc/mysql/mariadb.conf.d/50-server.cnf'

# used for socket
RUN mkdir -p /var/run/mysqld && \
    chown -R mysql:mysql /var/lib/mysql /var/run/mysqld && \
    chmod 777 /var/run/mysqld && \ 
    touch /var/run/mysqld/mysqld.sock

# init db here

COPY docker-entrypoint.sh /
RUN chmod +x /docker-entrypoint.sh

#ENTRYPOINT ["/docker-entrypoint.sh"]
ENTRYPOINT ["tail", "-f"]

我试图将 mariadb 连接到 wordpress (mariadb-client)，但出现错误： Can't connect to MySQL server on 'mariadb'

所以我测试端口是好的。但是，虽然 nginx:80 或 wordpress:9000 等其他端口可以被其他容器访问，但 mariadb 的端口拒绝连接。

我无法弄清楚 mariadb 容器与其他容器之间的区别。有什么问题吗？

Answer 1

您的 MariaDB Dockerfile 的入口点是

ENTRYPOINT ["tail", "-f"]

所以它实际上并不运行 MariaDB。

您可能需要将其注释掉并在

中回复

ENTRYPOINT ["/docker-entrypoint.sh"]

Answer 2

我对端口感到困惑。我认为每个容器只能通过 opening 个端口进行通信，但没有 LISTENing 个端口。 Docker-compose ports:只是绑定端口，与LISTEN.

无关

Docker: 无法连接到其他容器

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