I have three docker containers that all need access to postgres on port 5432. Running each independently I can pass -p 5432:5432 but I can't run two or more at a time because they conflict.
I'm hoping to get around this issue with docker compose but I need direction on how to do that port mapping in the yml.
This is what I have, which is not working :
version: '2'
services:
foo:
image: mynamespace/foo
ports:
- "5432:5432"
bar:
image: mynamespace/bar
ports:
- "5432:5432"
baz:
image: mynamespace/baz
ports:
- "5432:5432"
You don't need to open the port on every container. You only have to open it for your database container. Which results in something like this:
version: '2'
services:
foo:
image: mynamespace/foo
bar:
image: mynamespace/bar
baz:
image: mynamespace/baz
Related
I'm trying to access to my mongo database on docker with adminmongo.
Here's my docker-compose.yml
version: '3'
services:
mongo:
image: mongo
volumes:
- ~/data:/data/db
restart: always
expose:
- 6016
adminmongo:
image: mrvautin/adminmongo
expose:
- 1234
links:
- mongo:mongo
When i do a docker-compose up everything works fine, adminmongo also return me this : adminmongo_1_544d9a6f954c | adminMongo listening on host: http://localhost:1234
But when i go to localhost:1234 my navigator is telling me this page doesn't exist.
Here's what a docker ps return me :
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
9c27d4a89254 mrvautin/adminmongo "/bin/sh -c 'node ap…" 38 seconds ago Up 33 seconds 1234/tcp iris_adminmongo_1_544d9a6f954c
2a7496a8c56a mongo "docker-entrypoint.s…" 40 minutes ago Up 38 seconds 6016/tcp, 27017/tcp iris_mongo_1_7f00356a3adc
I've found 2 issues here:
1st: Exposing a port is not enough. expose is just documentation, you need to publish (bind) a port to the host to be reachable. This is how it's done:
ports:
- 1234:1234
2nd: you have to configure adminmongo to listen to 0.0.0.0 because by default it starts listening on 127.0.0.1 and this makes it accessible only inside the container itself. From the documentation page you've included in your question, the Configuration section states that this can be done by passing an environment variable:
All above parameters are usable through the environment which makes it very handy to when using adminMongo as a docker container! just run docker run -e HOST=yourchoice -e PORT=1234 ...
Since you are using docker-compose, this is done by the following:
environment:
- HOST=0.0.0.0
Working example:
version: '3'
services:
mongo:
image: mongo
volumes:
- ~/data:/data/db
restart: always
expose:
- 6016
adminmongo:
image: mrvautin/adminmongo
ports:
- 1234:1234
environment:
- HOST=0.0.0.0
Example of docker-compose works :
version: '3'
services:
server:
container_name: docker_api_web_container
image: docker_api_web
build: .
volumes:
- ./src:/usr/src/node-app/src
- ./package.json:/usr/src/node-app/package.json
environment:
- ENV=DEVELOPMENT
- PORT=4010
ports:
- '9000:4010'
depends_on:
- 'mongo'
mongo:
container_name: docker_mongo_container
image: 'mongo'
ports:
- '27017:27017'
adminmongo:
container_name: docker_adminmongo_container
image: mrvautin/adminmongo
links: ['mongo:mongo']
environment:
- HOST=0.0.0.0
ports:
- '1234:1234'
You have to expose your service to the outside world like this:
version: '3'
services:
mongo:
image: mongo
volumes:
- ~/data:/data/db
restart: always
adminmongo:
image: mrvautin/adminmongo
ports:
- 1234:1234
Now you can access your adminmongo by http://localhost:1234.
And you don't have to use links here.Since compose creates a network and joins all services in the compose files. You can access other containers with their service names.
I've done a docker-compose up and been able to run my web service attached to a postgresql image. Problem is, I can't view the data on postico when I try to access the database. The name of the image is db and when i try to specify hostname to be "db" on postico before i connect, i get an error saying hostname not found. I've entered my credentials, port and database name the same way i keyed them in my docker-compose file.
Does anybody know how i can find the correct setup to connect to within the container?
version: '3.6'
services:
phoenix:
# tell docker-compose which Dockerfile it needs to build
build:
context: .
dockerfile: Dockerfile.phoenix.development
# map the port of phoenix to the local dev port
ports:
- 4000:4000
# mount the code folder inside the running container for easy development
volumes:
- ./my_app:/app
# make sure we start mongodb when we start this service
# links:
# - db
depends_on:
- db
- redis
environment:
GOOGLE_CLIENT_ID: ${GOOGLE_CLIENT_ID}
GOOGLE_CLIENT_SECRET: ${GOOGLE_CLIENT_SECRET}
FACEBOOK_CLIENT_ID: ${FACEBOOK_CLIENT_ID}
FACEBOOK_CLIENT_SECRET: ${FACEBOOK_CLIENT_SECRET}
POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
POSTGRES_USER: ${POSTGRES_USER}
go:
build:
context: .
dockerfile: Dockerfile.go.development
ports:
- 8080:8080
volumes:
- ./genesys-api:/go/src/github.com/sc4224/genesys-api
depends_on:
- db
- redis
- phoenix
db:
container_name: db
image: postgres:latest
ports:
- "5432:5432"
environment:
POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
POSTGRES_USER: ${POSTGRES_USER}
volumes:
- ./data/db:/data/db
restart: always
redis:
container_name: redis
image: redis:latest
ports:
- "6379:6379"
volumes:
- ./data/redis:/data/redis
entrypoint: redis-server
restart: always
use hostname as localhost.
You can't use the hostname db outside the internal docker network. That would work in the applications running in the same network.
Since you exposed the db to run on port 5432, it's exposed via 0.0.0.0:5432->5432/tcp and therefore is accessible with localhost as host and port 5432
How to access postgres-docker container other docker container without ip address?
I want to store data in postgres by using myweb. in jar given host like localhost:5432/db..
Here my compose file:
version: "3"
services:
myweb:
build: ./myweb
container_name: app
ports:
- "8080:8080"
- "9090:9090"
networks:
- front-tier
- back-tier
depends_on:
- "postgresdb"
postgresdb:
build: ./mydb
image: ppk:postgres9.5
volumes:
- dbdata:/var/lib/postgresql
ports:
- "5432:5432"
networks:
- back-tier
volumes:
dbdata: {}
networks:
front-tier:
back-tier:
Instead of localhost:5432/db.. use postgresdb:5432/db.. connection string.
By default the container has the same hostname as the service name.
Here is my minimal working example, which is connecting a java client (boxfuse/flyway) with postgres server. The most important part is the heath check, which is delaying the start of the myweb container to the time when postgres is ready to accept connections.
Note that this can be directly executed by docker-compose up, it dosen't have any other dependencies. Both the images are from docker hub.
version: '2.1'
services:
myweb:
image: boxfuse/flyway
command: -url=jdbc:postgresql://postgresdb/postgres -user=postgres -password=123 info
depends_on:
postgresdb:
condition: service_healthy
postgresdb:
image: postgres
environment:
- POSTGRES_PASSWORD=123
healthcheck:
test: "pg_isready -q -U postgres"
That is the Docker Networking problem. The solution is to use postgresdb:5432/db in place of localhost:5432/db because the two service is in the same network named back-tier and docker deamon will use name service like a DNS name to make communication between the two container. I think that my solution will help you so.
Here is my docker compose file:
version: "3.3"
services:
test:
image: test
networks:
- mongo_net
ports:
- 4000:80
depends_on:
- mongodb
links:
- mongodb
mongodb:
image: mongo:latest
networks:
- mongo_net
ports:
- 27017:27017
volumes:
- local_data:/data/db
volumes:
local_data:
networks:
mongo_net:
driver: bridge
The 'test' image cannot find the 'mongodb' instance.
My assumption is that the 'links' section would connect the two, but it is not happening.
What am I missing?
for your compose file try just using depends_on. links is deprecated and maybe thats why you are currently getting issues since this is a V3 compose file.
I want to use my app from a docker container with anothers docker container, one for postgres and one for solr.
My docker compose is:
version: '3'
services:
core:
build: ./core
ports:
- "8081:8081"
environment:
- "SPRING_PROFILES_ACTIVE=production"
links:
- postgresdb
- solrdb
postgresdb:
image: postgres:9.4
container_name: postgres
ports:
- "5432:5432"
environment:
- DB_DRIVER=org.postgresql.Driver
- DB_URL=jdbc:postgresql://localhost:5432/db
- DB_USERNAME=db
- DB_PASSWORD=db
networks:
default:
solrdb:
image: solr:5.5
container_name: solr
ports:
- "8983:8983"
environment:
- DB_URL=http://localhost:8984/solr
networks:
default:
networks:
default:
external:
name: mynet
And already I have containers for solr and postgres created, just I want to use it. How I can do it?
You have already exposed the ports for solrdb and the postgresdb. So in your other container access these Dbs by the container names and the exposed port.
For example, solrDb should be accessed via solrdb:8983 and
the postgresdb should be accessed via postgresdb:5432
Edit :
Make sure that both the containers are operating in the same network. You need to add this network field for all the containers.
postgresdb:
image: postgres:9.4
container_name: postgresdb
ports:
- "5432:5432"
environment:
- DB_DRIVER=org.postgresql.Driver
- DB_URL=jdbc:postgresql://localhost:5432/db
- DB_USERNAME=db
- DB_PASSWORD=db
networks:
default:
and in the end of all the docker file
networks:
default:
external:
name: <your-network-name>
And make sure that your predefined network is running prior to the start of these containers.
To create the network :
docker network create --driver overlay --scope global <your-network-name>
Note : Your container ('postgresdb') will be accessible by postgresdb:5432