我有几个域共享一个公共IP(EC2实例)。我的设置是这样的:
/home/ubuntu
包含docker-compose.yml
:
version: '3'
services:
nginx-proxy:
image: "jwilder/nginx-proxy"
container_name: nginx-proxy
volumes:
- /var/run/docker.sock:/tmp/docker.sock:ro
ports:
- "80:80"
restart: "always"
这将创建一个名为ubuntu_default
的网络,该网络将允许其他撰写实例加入。 nginx-proxy
图像会为其他组合实例创建反向代理,以便您可以访问example.com并被路由到适当的组合实例中的适当的UI。
/home/ubuntu/example.com/project-1
包含一个docker-compose.yml
,例如:
version: '3'
services:
db:
build: "./db" # mongo
volumes:
- "./data:/data/db"
restart: "always"
api:
build: "./api" # a node backend
ports:
- "9005:9005"
restart: "always"
depends_on:
- db
ui:
build: "./ui" # a react front end
ports:
- "8005:8005"
restart: "always"
environment:
- VIRTUAL_HOST=project-1.example.com # this tells nginx-proxy which domain to proxy
- VIRTUAL_PORT=8005 # this tells nginx-proxy which port to proxy
networks:
default:
external:
name: ubuntu_default
/home/ubuntu/testing.com/project-2
包含一个docker-compose.yml
,例如:
version: '3'
services:
db:
build: "./db" # postgres
volumes:
- "./data:/var/lib/postgresql/data"
restart: "always"
api:
build: "./api" # a python backend
ports:
- "9000:9000"
restart: "always"
depends_on:
- db
ui:
build: "./ui" # a react front end
ports:
- "8000:8000"
restart: "always"
environment:
- VIRTUAL_HOST=testing.com,www.testing.com # tells nginx-proxy which domains to proxy
- VIRTUAL_PORT=8000 # tells nginx-proxy which port to proxy
networks:
default:
external:
name: ubuntu_default
所以基本上:
...而且只要我一次只运行一个,一切都可以完美运行。当我启动两个Compose实例时,/ api url开始冲突。我可以坐在其中之一上并反复刷新,有时会在example.com/api中看到一个,有时会在testing.com/api中看到一个。
我现在不知道发生了什么。也许我要应对的前提存在根本缺陷,但似乎是Docker / Compose的预期用途。我乐于接受建议,否则可以实现相同的目的。
答案 0 :(得分:1)
Docker容器在其网络上使用DNS查找进行通信。如果多个容器在同一网络上具有相同的别名,则它将在具有每个网络连接的容器之间循环负载均衡。如果您不希望容器彼此通信,那么您不希望它们在同一个docker网络上。好消息是,您可以使用多个网络来解决此问题,而不是将api和db服务器放在前端代理网络上:
version: '3'
services:
db:
build: "./db" # postgres
volumes:
- "./data:/var/lib/postgresql/data"
restart: "always"
api:
build: "./api" # a python backend
ports:
- "9000:9000"
restart: "always"
depends_on:
- db
ui:
build: "./ui" # a react front end
ports:
- "8000:8000"
restart: "always"
networks:
- default
- proxy
environment:
- VIRTUAL_HOST=testing.com,www.testing.com # tells nginx-proxy which domains to proxy
- VIRTUAL_PORT=8000 # tells nginx-proxy which port to proxy
networks:
proxy:
external:
name: ubuntu_default
如果您不覆盖默认网络,则docker将为您的撰写项目创建一个,并将其用于未分配给另一个网络的任何容器。