I have two docker containers. I'm trying to curl between one and the other container.
I've set up a common network.
Here is my docker-compose:
version: '3.8'
services:
web:
build: ./webapp/.
container_name: storyweb
command: python3 /app/manage.py runserver 0.0.0.0:8000
volumes:
- ./webapp/:/app/
ports:
- 8007:8000
networks:
- backend
env_file:
- ./.env.dev
novnc:
container_name: dramatica
build: ./dramatica/.
environment:
# Adjust to your screen size
- DISPLAY_WIDTH=1200
- DISPLAY_HEIGHT=800
- PUID=1000
- PGID=1000
ports:
- "8008:8080"
volumes:
- ./dramatica:/app
networks:
- backend
restart: unless-stopped
depends_on:
- web
entrypoint: /app/entrypoint.sh
networks:
backend:
driver: bridge
I'm tryin gto curl from inside vovnc container:
curl -i web:8007
I've also tried storyweb.
Any idea why this is not working?
When your server container runs a server process
python3 /app/manage.py runserver 0.0.0.0:8000
connections between containers need to go to that port 8000. ports: aren't used or required here, and can be removed if you don't require the service to be directly accessible from outside containers on the same Docker network.
If you are trying the command curl -i web:8007 from your host machine. It will not work. You try this command from inside a container. You can try the following method
curl -i localhost:8007
docker-compose novnc curl -i web:8007
Related
my system contains 3 dockers:
mongodb
api backend, built with Nestjs
web application, build with Nuxt.js
the mongo and the backend seems to be working, because i can access the swagger at localhost:3000/api/.
the Nuxtjs web app is failing, and i'm getting 500 Nuxtserver error.
Dockerfile (for the web app):
FROM node:12.13-alpine
ENV APP_ROOT /src
RUN mkdir ${APP_ROOT}
WORKDIR ${APP_ROOT}
ADD . ${APP_ROOT}
RUN npm install
RUN npm run build
ENV HOST 0.0.0.0
EXPOSE 4000
docker-compose.yml:
version: "3"
services:
# backend nestjs app
api:
image: nestjs-api-server
container_name: my-api
depends_on:
- db
restart: unless-stopped
environment:
- NODE_ENV=production
ports:
- 3000:3001
networks:
- mynet
links:
- db
# mongodb
db:
image: mongo
container_name: db_mongo
restart: unless-stopped
volumes:
- ~/data/:/data/db
ports:
- 27017:27017
networks:
- mynet
# front web app, nuxt.js
web:
image: nuxtjs-web-app
container_name: my-web
depends_on:
- api
restart: always
ports:
- 4000:4000
environment:
- BASE_URL=http://localhost:3000/api
command:
"npm run start"
networks:
- mynet
networks:
mynet:
driver: bridge
Looks like the nuxtjs app cannot connect to the api. in the log i see:
ERROR connect ECONNREFUSED 127.0.0.1:3000
But why? the swagger (coming from the same api) works fine on http://localhost:3000/api/#/.
Any idea?
environment:
- BASE_URL=http://localhost:3000/api
localhost in a container means inside that particular container. i.e., it will try to resolve port 3000 in my-web container itself.
Basically from front-end you cannot do container communication. May be you can communicate via public hostname or ip or you can make use of extra_hosts concept in docker-compose to resolve localhost.
Got it. The problem was in nuxtServerInit. This is a very special method on vuex, and it is running in the server. i called $axios from it, and i guess you can't do that.
once i commented that method, it's working fine.
I have an issue I discovered while trying to try PHPUnit tests with CURL commands. I always get:
Connecting to `www.example.local` (www.example.local)|127.0.0.1|:80... failed: Connection refused.
I then tried to run wget and curl commands from the container command line, same problem. I have docker working like this.
In my computer’s /etc/hosts
127.0.0.1 www.example.local
127.0.0.1 api.example.local
and so forth and it works when accessing the sites in my browser. In my docker-compse.yml, I have:
version: “3.4”
volumes:
postgres_database :
external: false
mysql_data : {}
schemas:
external: false
services:
php:
build:
context : ./
dockerfile : Dockerfile
network: host
volumes:
- ./:/code
- ./uploads.ini:/usr/local/etc/php/conf.d/uploads.ini
depends_on: [ "postgres"]
ports:
- "9000:9000"
expose:
- "9000"
container_name: binge_php
web:
image: nginx:latest
build:
context : ./
dockerfile : Dockerfile_Nginx
network: host
ports:
- "80:80"
expose:
- "0"
volumes:
- ./:/code
- ./site.conf:/etc/nginx/conf.d/site.conf
- ./nginx_custom_settings.conf:/etc/nginx/conf.d/nginx_custom_settings.conf
links:
- php
depends_on:
- php
container_name: binge_nginx
What might I be doing wrong that is preventing me from running curl commands from inside the PHP container?
I don't how to run the docker-compose equivalent of my code
docker run -d --name=server --restart=always --net network --ip 172.18.0.5 -p 5003:80 -v $APP_PHOTO_DIR:/app/mysql-data -v $APP_CONFIG_DIR:/app/config webserver
I've done this:
version: '3'
services:
server:
image: app-dependencies
ports:
- "5003:80"
volumes:
- ./app:/app
command: python /app/app.py
restart: always
networks:
app_net:
ipv4_address: 172.18.0.5
Are you sure you need an IP address for container? It is not recommended practice, why do you want to set it explicitly?
docker-compose.yml
version: '3'
services:
server: # correct, this would be container's name
image: webserver # this should be image name from your command line
ports:
- "5003:80" # correct, but only if you need to communicate to service from ouside
volumes: # volumes just repeat you command line, you can use Env vars
- $APP_PHOTO_DIR:/app/mysql-data
- $APP_CONFIG_DIR:/app/config
command: ["python", "/app/app.py"] # JSON notation strongly recommended
restart: always
Then docker-compose up -d and that's it. You can access your service from host with localhost:5003, no need for internal IP.
For networks, I always include in the docker-compose file, the network specification. If the network already exists, docker will not create a new one.
version: '3'
services:
server:
image: app-dependencies
ports:
- "5003:80"
volumes:
- ./app:/app
command: python /app/app.py
restart: always
networks:
app_net:
ipv4_address: 172.18.0.5
networks:
app_net:
name: NETWORK_NAME
driver: bridge
ipam:
config:
- subnet: NETWORK_SUBNET
volumes:
VOLUME_NAME:
driver:local
And you will need to add the volumes separately to match the docker run command.
I'm trying to make service that can forward remote database port to container and at the same time can be accessible by alias hostname from other containers to work with them.
I am think that make all containers communicate by host network is bad practice, so i am trying to setup that configuration.
When i am triyng to add to php-fpm service network with driver: host, docker says
only one instance of "host" network is allowed
When i am trying to set php-fpm service with this
networks
- host
Docker says that he cant find out network with this name.
When i try to define network in docker-compose by id of built-in host, it just cant start this container.
This is my docker-compose:
version: '3.2'
networks:
backend-network:
driver: bridge
frontend-network:
driver: bridge
volumes:
redis-data:
home-dir:
services:
&app-service app: &app-service-template
build:
context: ./docker/app
dockerfile: Dockerfile
volumes:
- ./src:/app:rw
- home-dir:/home/user
hostname: *app-service
environment:
FPM_PORT: &php-fpm-port 9001
FPM_USER: "${USER_ID:-1000}"
FPM_GROUP: "${GROUP_ID:-1000}"
APP_ENV: local
HOME: /home/user
command: keep-alive.sh
networks:
- backend-network
&php-fpm-service php-fpm:
<<: *app-service-template
user: 'root:root'
restart: always
hostname: *php-fpm-service
ports: [*php-fpm-port]
environment:
FPM_PORT: *php-fpm-port
FPM_USER: "${USER_ID:-1000}"
FPM_GROUP: "${GROUP_ID:-1000}"
APP_ENV: local
HOME: /home/user
entrypoint: /fpm-entrypoint.sh
command: php-fpm --nodaemonize -R -d "opcache.enable=0" -d "display_startup_errors=On" -d "display_errors=On" -d "error_reporting=E_ALL"
networks:
- backend-network
- frontend-network
nginx:
build:
context: ./docker/nginx
dockerfile: Dockerfile
restart: always
working_dir: /usr/share/nginx/html
environment:
FPM_HOST: *php-fpm-service
FPM_PORT: *php-fpm-port
ROOT_DIR: '/app/public' # App path must equals with php-fpm container path
volumes:
- ./src:/app:ro
ports: ['9999:80']
depends_on:
- *php-fpm-service
networks:
- frontend-network
Network scheme (question about green line):
Host works on Debian 7 (updates prohibited) and conainer works with lastest Alpine
I am using Docker version 1.12.3 and docker-compose version 1.8.1. I have some services which contains for example elasticsearch, rabbitmq and a webapp
My problem is that a service can not access another service by its host becuase docker-compose does not put all service hots in /etc/hosts file. I don't know their IP's because it is defined on docker-compose up phase.
I use networks feature as it is described at https://docs.docker.com/compose/networking/ instead of links because I do circular reference and links doesn't support it. But using networks does not put all services hosts to each service nodes /etc/hosts file. I set container_name, I set hostname but nothing happened. What I am missing;
Here is my docker-compose.yml;
version: '2'
services:
elasticsearch1:
image: elasticsearch:5.0
container_name: "elasticsearch1"
hostname: "elasticsearch1"
command: "elasticsearch -E cluster.name=GameOfThrones -E node.name='Ned Stark' -E discovery.zen.ping.unicast.hosts=elasticsearch1,elasticsearch2,elasticsearch3"
volumes:
- "/opt/elasticsearch/data"
ports:
- "9200:9200"
- "9300:9300"
networks:
- webapp
elasticsearch2:
image: elasticsearch:5.0
container_name: "elasticsearch2"
hostname: "elasticsearch2"
command: "elasticsearch -E cluster.name=GameOfThrones -E node.name='Daenerys Targaryen' -E discovery.zen.ping.unicast.hosts=elasticsearch1,elasticsearch2,elasticsearch3"
volumes:
- "/opt/elasticsearch/data"
networks:
- webapp
elasticsearch3:
image: elasticsearch:5.0
container_name: "elasticsearch3"
hostname: "elasticsearch3"
command: "elasticsearch -E cluster.name=GameOfThrones -E node.name='John Snow' -E discovery.zen.ping.unicast.hosts=elasticsearch1,elasticsearch2,elasticsearch3"
volumes:
- "/opt/elasticsearch/data"
networks:
- webapp
rabbit1:
image: harbur/rabbitmq-cluster
container_name: "rabbit1"
hostname: "rabbit1"
environment:
- ERLANG_COOKIE=abcdefg
networks:
- webapp
rabbit2:
image: harbur/rabbitmq-cluster
container_name: "rabbit2"
hostname: "rabbit2"
environment:
- ERLANG_COOKIE=abcdefg
- CLUSTER_WITH=rabbit1
- ENABLE_RAM=true
networks:
- webapp
rabbit3:
image: harbur/rabbitmq-cluster
container_name: "rabbit3"
hostname: "rabbit3"
environment:
- ERLANG_COOKIE=abcdefg
- CLUSTER_WITH=rabbit1
networks:
- webapp
my_webapp:
image: my_webapp:0.2.0
container_name: "my_webapp"
hostname: "my_webapp"
command: "supervisord -c /etc/supervisor/supervisord.conf -n"
environment:
- DYNACONF_SETTINGS=settings.prod
ports:
- "8000:8000"
tty: true
networks:
- webapp
networks:
webapp:
driver: bridge
This is how I understand they can't comunicate with each other;
I get this error on elasticserach cluster initialization;
Caused by: java.net.UnknownHostException: elasticsearch3
And this is how I docker-composing
docker-compose up
If the container expects the hostname to be available immediate when the container starts that is likely why it's failing.
The hostname isn't going to exist until the other containers start. You can use an entrypoint script to wait until all the hostnames are available, then exec elasticsearch ...