我如何给一个容器一个静态ip，或者我如何链接两个Docker容器?

Question

我有一个RabbitMQ的容器，它必须连接到应用程序容器的外部IP，问题是这个外部IP是动态的，每次都在变化。因此，我每次都必须手动更改RabbitMQ的配置。也许你可以为应用设置一个静态ip容器，使它不会改变或以某种方式连接这两个容器?

version: '3'
services:
#PHP Service
app:
build:
context: .
dockerfile: Dockerfile
image: digitalocean.com/php
container_name: app
restart: unless-stopped
tty: true
environment:
SERVICE_NAME: app
SERVICE_TAGS: dev
working_dir: /var/www
volumes:
- ./:/var/www
- ./docker/php/local.ini:/usr/local/etc/php/conf.d/local.ini
networks:
- postgres
#Nginx Service
webserver:
image: nginx:alpine
container_name: webserver
restart: unless-stopped
tty: true
ports:
- "80:80"
- "443:443"
volumes:
- ./:/var/www
- ./docker/nginx/conf.d/:/etc/nginx/conf.d/
networks:
- postgres
#Redis
redis:
image: 'redis:alpine'
ports:
- "6379:6379"
#PostgreSQL        
postgres:
container_name: postgres_container
image: postgres
hostname: postgres
environment:
POSTGRES_DB: postgres
POSTGRES_USER: postgres
POSTGRES_PASSWORD: secret
PGDATA: /data/postgres
volumes:
- postgres:/data/postgres
ports:
- "5432:5432"
networks:
- postgres
restart: unless-stopped
pgadmin:
container_name: pgadmin_container
image: dpage/pgadmin4
environment:
PGADMIN_DEFAULT_EMAIL: ${PGADMIN_DEFAULT_EMAIL:[e-mail]}
PGADMIN_DEFAULT_PASSWORD: ${PGADMIN_DEFAULT_PASSWORD:-admin}
volumes:
- pgadmin:/root/.pgadmin
ports:
- "${PGADMIN_PORT:-5050}:80"
networks:
- postgres
restart: unless-stopped  
depends_on: 
- postgres     
#RabbitMQ
rabbit:
image: "rabbitmq:3-management"
hostname: "rabbit"
environment:
RABBITMQ_ERLANG_COOKIE: "SWQOKODSQALRPCLNMEQG"
RABBITMQ_DEFAULT_USER: "rabbitmq"
RABBITMQ_DEFAULT_PASS: "rabbitmq"
RABBITMQ_DEFAULT_VHOST: "/"
ports:
- "15672:15672"
- "5672:5672"
labels:
NAME: "rabbitmq"    
networks:
- postgres     
#ElasticSearch
elasticsearch:
image: docker.elastic.co/elasticsearch/elasticsearch:5.4.3
ports:
- "9200:9200"
- "9300:9300"
networks:
- postgres                      
#Docker Networks
networks:
postgres:
driver: bridge
volumes:
postgres:
pgadmin:  

Answer 1

如果它们在同一个网络中，你可以简单地使用服务名而不是IP，只使用应用程序，你可以在rabbitMQ容器中ping应用程序的服务名，它就可以工作了。

Answer 2

当您使用docker-compose时，所有containers已经在同一网络上。您可以使用指定的名称从另一个容器访问容器:例如，对于rabbitmq，它是rabbit对于redis，它将是redis