I have two docker-compose.yml files. In the first one, I run a mongodb instance:
version: '3'
services:
mongodb:
image: mongo:latest
container_name: "mongodb"
volumes:
- ./data/db:/data/db
ports:
- 27017:27017
In the second one, I run my web app and I want to link it with mongodb container:
version: '3'
services:
webapp:
build:
context: .
external_links:
- mongodb
ports:
- 8080:8080
But, when I run my webapp, I get a connection error. I'm connecting to this URI:
const DB_URI = 'mongodb://mongodb:27017/mydb';
but I get MongoNetworkError. What am I missing?
I would recommend you to use those two services in the same docker-compose file and replace external_links with links
version: '3'
services:
mongodb:
image: mongo:latest
container_name: "mongodb"
volumes:
- ./data/db:/data/db
ports:
- 27017:27017
webapp:
build:
context: .
links:
- mongodb
depends_on:
- mongodb
ports:
- 8080:8080
How could I ensure mongodb is up and running before webapp is started?
AFAIK, the links will take care of the the situation.
or
You could use depends_on
Solved. Hosts were not accessible because they were in different networks. Creating a network (https://docs.docker.com/compose/networking/) and running both services in that network solved the problem.
Related
I have this really simple setup with a web app in one container and a Postgres service running in another container.
I need to connect to the Postgres container and thought PGHOST="db" would point to that container ..?
But I keep getting Error: getaddrinfo ENOTFOUND "db" at GetAddrInfoReqWrap.onlookup that I read as; can't find the "db" host ...
What am I missing here?
version: "3.9"
services:
web:
build: .
ports:
- "8081:3011"
links:
- db
environment:
- PGHOST="db"
- PGDATABASE="testdb"
- PGUSER="postgres"
- PGPASSWORD="postgres"
db:
image: postgres
ports:
- "5432:5432"
volumes:
- /usr/local/var/postgresql#13
Try this config. You don't need quotes when passing env variables. And it is better to use depends_on here to make sure DB is up and running before your app starts.
version: "3.9"
services:
web:
build: .
ports:
- "8081:3011"
depends_on:
- db
environment:
- PGHOST=db
- PGDATABASE=testdb
- PGUSER=postgres
- PGPASSWORD=postgres
db:
image: postgres
ports:
- "5432:5432"
volumes:
- /usr/local/var/postgresql#13
Normally I'd have an instance neo4j running in Docker, then in a script I access the driver like so:
self.driver = GraphDatabase.driver(uri="bolt://localhost:7687", auth=("username", "password"))
I'm now putting this script itself into a Docker container, but I now get the error message:
neo4j.exceptions.ServiceUnavailable: Failed to establish connection to IPv6Address(('::1', 7687, 0, 0)) (reason [Errno 99] Cannot assign requested address)
What uri (or other parameter) needs changing to access a neo4 Docker instance, from another docker container?
Within my docker-compose.yml, I have:
version: '3'
services:
neo4j:
container_name: neo4j
image: neo4j:3.5
restart: always
environment:
- NEO4J_dbms_memory_pagecache_size=2G
- dbms_connector_bolt_tls__level=OPTIONAL
- NEO4J_dbms_memory_heap_max__size=3500M
- NEO4J_AUTH=neo4j/start
volumes:
- $HOME/neo4j/data:/data
- $HOME/neo4j/logs:/logs
- $HOME/neo4j/import:/import
- $HOME/neo4j/plugins:/plugins
ports:
- 7474:7474
- 7687:7687
appgui:
container_name: appgui
image: python:3.7.3-slim
build:
context: ./APPGUI/
volumes:
- ./APPGUI/:/usr/src/app/
restart: always
environment:
PORT: 5000
FLASK_DEBUG: 1
ports:
- 80:80
depends_on:
- neo4j
I also can't access my web app (http://localhost:5000)
Your service can't connect to localhost Neo4j, because it is inside a docker container, and localhost points to the docker containers instead of your local machine.
In this case, it is best to run both containers with docker-compose. You want to set the depends on feature in the other docker container. Here is an example docker-compose.yml file from my project.
version: '3.7'
services:
neo4j:
image: neo4j:4.1.2
restart: always
hostname: neo4jngs
container_name: neo4jngs
ports:
- 7474:7474
- 7687:7687
api:
build:
context: ./API
hostname: api
restart: always
container_name: api
ports:
- 3000:3000
depends_on:
- neo4j
As you can see, the api container is a service that will connect to Neo4j. Now you can change the driver settings to:
self.driver = GraphDatabase.driver(uri="bolt://neo4j:7687", auth=("username", "password"))
And you are good to go.
I solved it and it was actually a dumb mistake, but one that could happen to others I guess...
In the docker-compose.yml:
build: ./APP1/
needs to be in quotes, so:
build: './APP1/'
However Tomaž Bratanič provided me with some helpful tips to get a resolve.
I've built two NEST app which shares a common database. I've been trying to figure out a way to make these two apps to get data from the Mongo db container. I'm stuck with this process.
docker-compose.yml with app 1
version: '3'
services:
backend:
image: 'example-image_1:1.0.0'
working_dir: /app/example-app-1/backend/example-app-1-api
environment:
- DB_URL=mongodb://0.0.0.0:27017/example_app_1
- BACKEND_PORT=3333
- BACKEND_IP=0.0.0.0
restart: always
network_mode: "host"
ports:
- '3333:3333'
command: ['node', 'main.js']
depends_on:
- mongodb
expose:
- 3333
mongodb:
image: 'mongo:latest'
environment:
- 'MONGODB_DATABASE="example_app_1"'
ports:
- '27017:27017'
expose:
- 27017
docker-compose.yml with app-2
version: '3'
services:
backend:
image: 'example_app_2:1.0.0'
working_dir: /app/example_app_2/backend/example-app-2-api
environment:
- DB_URL=mongodb://0.0.0.0:27017/example_app_2
- BACKEND_PORT=8888
- BACKEND_IP=0.0.0.0
restart: always
ports:
- '8888:8888'
command: ['node', 'main.js']
expose:
- 8888
mongodb:
image: 'mongo:latest'
environment:
- 'MONGODB_DATABASE="example_app_2"'
ports:
- '27017:27017'
expose:
- 27017
I need help in making these app communicate with common container - mongodb
Click link for Architecture Setup
Since you're using 2 different docker-compose.yml you're actually running 2 backend and 2 mongodb on 2 docker-networks
One of the 2 mongo won't start cause the port is already occupied.
Option 1 (nicer):
services:
backend_1:
...
ports:
- '8888:8888'
backend_2:
...
ports:
- '8899:8899'
mongodb:
ports:
- '27017:27017'
This setup provides 3 container on the same network.
Now you can access at mongo from both backends at <mongo_ip>:27017
Option 2 (ugly):
services:
backend:
...
ports:
- '8888:8888'
mongodb:
ports:
- '27017:27017'
And in another docker-compose
services:
backend:
...
ports:
- '8888:8888'
This setup provides 3 container on 2 different network.
In this setup each docker-compose.yml has it's own docker network, so from the second backend service you have to connect to another docker network to access the container.
I have a sample app which consists of three parts:
mongo database
node api (server side)
angular web app (client side)
the goal is to containerize those three parts and run the app.
so to reach there I've created docker-compose.yml file like below:
# docker-compose -f docker-compose.prod.yml build
# docker-compose -f docker-compose.prod.yml up -d
# docker-compose -f docker-compose.prod.yml down
version: '3'
services:
mongodb:
image: mongo
container_name: mongodb-instance-microservices
ports:
- "27020:27017"
networks:
- microservices-network
client:
container_name: client-instance-microservices
image: client-microservices
build:
context: ./client
dockerfile: prod.dockerfile
ports:
- "8080:80"
- "443:443"
depends_on:
- api
networks:
- microservices-network
api:
container_name: api-instance-microservices
image: api-microservices
build:
context: ./server
dockerfile: server.dockerfile
environment:
- NODE_ENV=production
ports:
- "3000:3000"
depends_on:
- mongodb
networks:
- microservices-network
networks:
microservices-network:
driver: bridge
in the server side i am running the main app.js which is trying to connect to the mongodb using this connection string:
mongodb://mongodb-instance-microservices:27020/TestDatabase
the problem is the server can not connect to the mongo db container.
i tried to expose the default port for mongo like below:
mongodb:
image: mongo
container_name: mongodb-instance-microservices
ports:
- "27017:27017"
networks:
- microservices-network
and update the connection string in the app.js file like this:
mongodb://mongodb-instance-microservices:27017/TestDatabase
and it's work fine.
the question is how to expose different port for mongo container and make it work fine?
When you connect between services using a Docker-internal network, you always connect to the internal port of the service. You don't explicitly need to publish ports (in Compose, with a ports: directive); if you do, the port you'd connect to is the one on the right.
Style-wise, also note that you don't need to manually declare a private network with default options that will only be used within this Docker Compose file (Compose will do something very similar to that for you), and you don't need to declare container_name: just for inter-container connectivity (Compose will add a network alias that matches the name of the service).
This is my compose file:
version: '3'
services:
web:
container_name: dash
build:
context: .
dockerfile: Dockerfile
args:
webpackVersion: 2.2.1
nodeVersion: "6.x"
ports:
- "3036:3036"
links:
- mongodb:dbhost
depends_on:
- mongodb
mongodb:
container_name: mongodb
build:
context: .
dockerfile: Dockerfile-mongodb
Right now web has access to mongodb container where I keep app configs. But I also need to be able access port 3306 on my local machine where I'm running docker-compose, from web.
I tried to follow the documentation, but I'm new in docker so it looks pretty complicated for me, how to use networking in docker-compose.
If any one can help me to understand this I'll be really grateful!
I found only one way to open all host ports, is to use network_mode: host
it should be also possible by using network but in my case first solution was enough.
version: '3'
services:
web:
container_name: dash
network_mode: host
build:
context: .
dockerfile: Dockerfile
args:
webpackVersion: 2.2.1
nodeVersion: "6.x"
ports:
- "3036:3036"
links:
- mongodb:dbhost
depends_on:
- mongodb
mongodb:
container_name: mongodb
network_mode: host
build:
context: .
dockerfile: Dockerfile-mongodb
network_mode: host won't work on mac, you should run docker in VB