问题描述
我有一个网站托管在生产共享托管上。该网站通过代码中的 localhost 连接到数据库。在我的docker-compose中，我有一个 php：5.6-apache 和 mysql：5.6 实例。
I have a website hosted on shared hosting on production. The website connects to the database via localhost in the code. In my docker-compose I have a php:5.6-apache and mysql:5.6 instance.
是否仍然要告诉docker-compose将Web容器上的端口3306转发到db容器上的3306，以便当Web容器在3306上连接到localhost时被发送到3306上的db并同时将Web容器上的端口80共享给外界？
Is there anyway to tell docker-compose to have port 3306 on the web container port forwarded to 3306 on the db container so that when the web container ties to connect to localhost on 3306 it gets sent to db on 3306 and also share port 80 on the web container to the outside world?
当前docker-compose.yml：
Current docker-compose.yml:
version: "3"
services:
web:
build: .
#image: php:5.6-apache
ports:
- "8080:80"
environment:
- "APP_LOG=php://stderr"
- "LOG_LEVEL=debug"
volumes:
- .:/var/www/html
network_mode: service:db # See https://stackoverflow.com/a/45458460/95195
# networks:
# - internal
working_dir: /var/www
db:
image: mysql:5.6
ports:
- "3306:3306"
environment:
- "MYSQL_XXXXX=*****"
volumes:
- ./provision/mysql/docker-entrypoint-initdb.d:/docker-entrypoint-initdb.d
# networks:
# - internal
networks:
internal:
driver: bridge
当前错误：
推荐答案
是可以的。您需要使用 network_mode 选项。参见下面的示例
Yes it is possible. You need to use the network_mode option. See the below example
version: '2'
services:
db:
image: mysql
environment:
MYSQL_ROOT_PASSWORD: root
ports:
- "80:80"
- "3306:3306"
app:
image: ubuntu:16.04
command: bash -c "apt update && apt install -y telnet && sleep 10 && telnet localhost 3306"
network_mode: service:db
输出
app_1 | Trying 127.0.0.1...
app_1 | Connected to localhost.
app_1 | Escape character is '^]'.
app_1 | Connection closed by foreign host.
network_mode：service：db 指示码头工人不为其自己的专用网络分配 app 服务。而是让它加入 db 服务的网络。因此，您需要做的任何端口映射都需要在 db 服务本身上进行。
network_mode: service:db instructs docker to not assign the app services it own private network. Instead let it join the network of db service. So any port mapping that you need to do, needs to happen on the db service itself.
我通常使用的方式不同，我创建了一个 base 服务，该服务运行无限循环，而 db 和 app 服务都在基础服务网络上启动。所有端口映射都需要在基本服务上进行。
The way I usually use it is different, I create a base service which runs a infinite loop and the db and app service both are launched on base service network. All ports mapping need to happen at the base service.
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