I have created a spring app and i want to connect it to redis server which is deployed on docker-compose i put the needed properties as follow :
spring.redis.host=redis
spring.redis.port=6379
But i keep getting a ConnexionException so how can i Know on which host redis is running and how to connect to it.
Here is my docker-compose file :
version: '2'
services:
redis:
image: 'bitnami/redis:5.0'
environment:
# ALLOW_EMPTY_PASSWORD is recommended only for development.
- ALLOW_EMPTY_PASSWORD=yes
- REDIS_DISABLE_COMMANDS=FLUSHDB,FLUSHALL
ports:
- '6379:6379'
volumes:
- 'redis_data:/bitnami/redis/data'
volumes:
redis_data:
driver: local
From docker compose documentation
By default Compose sets up a single network for your app. Each container for a service joins the default network and is both reachable by other containers on that network, and discoverable by them at a hostname identical to the container name
If you want to access redis by container name ('redis' in this case), the Spring boot application has also be deployed as a docker compose service, but it doesn't appear in the docker-compose file that you've provided in the question, so please add it.
Alternatively If you're trying to run the spring boot application on host machine, use 'localhost' instead of 'redis' in order to access the redis container.
Another approach you can use is "docker network" , Below are the steps to follow :
Create a docker network for redis
docker network create redis-docker
Spin up redis container is redis-docker network.
docker run -d --net redis-docker --name redis-stack -p 6379:6379 -p 8001:8001 redis/redis-stack:latest
Inspect the redis-docker container
docker network inspect redis-docker
Copy the "IPv4Address" IP and paster in application.yml
Now build , start your application.
Related
I have a problem here that I really cannot understand. I already saw few topics here with the same problem and those topics was successfully solved. I basically did the same thing and cannot understand what I'm doing wrong.
I have a Spring application container that tries to connect to a Mongo container through the following Docker Composer:
version: '3'
services:
app:
build: .
ports:
- "8080:8080"
links:
- db
db:
image: mongo
volumes:
- ./database:/data
ports:
- "27017:27017"
In my application.properties:
spring.data.mongodb.uri=mongodb://db:27017/app
Finally, my Dockerfile:
FROM eclipse-temurin:11-jre-alpine
WORKDIR /home/java
RUN mkdir /home/java/bar
COPY ./build/libs/foo.jar /home/java/bar/foo.jar
CMD ["java","-jar", "/home/java/bar/foo.jar"]
When I run docker compose up --build I got:
2022-11-17 12:08:53.452 INFO 1 --- [null'}-db:27017] org.mongodb.driver.cluster : Exception in monitor thread while connecting to server db:27017
Caused by: java.net.UnknownHostException: db
Running the docker compose ps I can see the mongo container running well, and I am able to connect to it through Mongo Compass and with this same Spring Application but outside of container. The difference running outside of container is the host from spring.data.mongodb.uri=mongodb://db:27017/app to spring.data.mongodb.uri=mongodb://localhost:27017/app.
Also, I already tried to change the host for localhost inside of the spring container and didnt work.
You need to specify MongoDB host, port and database as different parameters as mentioned here.
spring.data.mongodb.host=db
spring.data.mongodb.port=27017
spring.data.mongodb.authentication-database=admin
As per the official docker-compose documentation the above docker-compose file should worked since both db and app are in the same network (You can check if they are in different networks just in case)
If the networking is not working, as a workaround, instead of using localhost inside the spring container, use the server's IP, i.e, mongodb://<server_ip>:27017/app (And make sure there is no firewall blocking it)
I am connecting to Redis from the spring boot app on the outside machine where the Redis server docker container is not running. When the app tries to connect to Redis, the app can't connect properly until the sent request is timed out. Meanwhile, if I try to connect from:
Inside the machine where the Redis server docker container is running with the host is localhost, I could connect it. And, I don't know why I can't connect by setup host value as a numerical IP/alphabetical (URL), only works with "localhost."
Outside machine where the Redis server docker container is not running with Redis client app GUI for management, I could connect it.
application.properties:
spring.redis.host=pc-1
spring.redis.port=6379
pc-1 is alias from some numerical ip. I'am using hosts feature from
windows to aliasing/redirecting it.
.env:
REDIS_PORT=6379
docker-compose.yml:
redis:
image: redis:latest
ports:
- "${REDIS_PORT}:6379"
command:
# - redis-server
# - --requirepass "${REDIS_PASSWORD}"
networks:
- redis
healthcheck:
test: ["CMD-SHELL", "redis-cli ping"]
interval: 10s
timeout: 10s
retries: 3
I need help on this issue.
Use the --service-ports flag to the docker compose command to publish the ports you've defined in the docker compose file.
Other debugging tips:
Hardcode the ${REDIS_PORT} variable in case the value is not getting set or set a default like ${REDIS_PORT:-default}
Pass the env file explicitly like docker compose --env-file ./somedir/.env up in case the env file is not being pick up
Use docker inspect to get container status, check the networking info
I'm pretty new to docker, and I've tried searching about networking but haven't found a solution that's worked.
I have a Laravel app that is using Laradock.
I also have an external 3rd party API that runs in its own docker container.
I basically want to specify the container name of the api inside my laravel .env file, and have it dynamically resolve the container ip so I can make API calls from my Laravel app. I can already do this with services that are already part of laradock like mariadb/mysql, but since my API is located in an external container, it can't connect to it.
I tried making a network and attaching them with;
docker network create my-network
Then inside my docker-compose.yml files for each of the containers, I specified;
networks:
my-network:
name: "my-network"
But if I try and ping them with;
docker exec -ti laradock-workspace-1 ping my-api
I can't connect and can't really figure out why. Was hoping someone familiar with docker might be able to explain why since I'm sure it's something very obvious I'm missing. Thanks!
By default Docker Compose uses a bridge network to provision inter-container communication. Read this article for more info about inter-container networking.
What matters for you, is that by default Docker Compose creates a hostname that equals the service name in the docker-compose.yml file.
Consider the following docker-compose.yml:
version: '3.9'
services:
server:
image: node:16.9.0
container_name: server
tty: true
stdin_open: true
depends_on:
- mongo
command: bash
mongo:
image: mongo
environment:
MONGO_INITDB_DATABASE: my-database
When you run docker-compose up, Docker will create a default network and assigns the service name as hostname for both mongo and server.
You can now access the backend container via:
docker exec -it server bash
And now you can ping the mongo container using Dockers internal network (default on port 27017 in this case):
curl -v http://mongo:27017/my-database
That's it. The same applies for your setup.
I have a basic spring boot application with gradle which makes calls to an Oracle database and the database properties are specified in an application.properties file.
I created a Docker image of the spring boot application with the plugin "com.google.cloud.tools.jib" and using the following command:
./gradlew jibDockerBuild --image=app1
I have a docker-compose file in which i specify the image as an service and i want the application to start when i run the command: "docker-compose up"
The docker-compose file is the following:
version: '3'
services:
app1:
image: "app1"
ports:
- "8731:8731"
But when I hit the run the "docker-compose up" command in CMD I recieve the following exception:
java.sql.SQLRecoverableException: IO Error: The Network Adapter could not establish the connection
More informations:
My Oracle database is a docker container with the name : "ORA12201_1" and port 3769
Inside the application.properties the database properties specified are correct since I am amble to start the application from IntelliJ
you can connect from IntelliJ without problem as the container exposes the port (3769) to the host (your PC), but now you are trying to connect from one Docker container to another.
The containers do not share the network (isolation) so you need to connect them.
One of the recommended approach is User-defined networks
Create first a network
docker network create --driver bridge my_network
Run the applications
docker run -p 5432:5432 --network my_network -d --name=postgres postgres
docker run -p 5050:80 --network my_network -d --name=pgadmin dpage/pgadmin4
You can verify they are effectively running on the same network with
docker network inspect my_network
Spring Boot config
You can now connect from one to another using host.docker.internal as hostname, for example in your Spring Boot application.properties
spring.datasource.url=jdbc:postgresql://host.docker.internal:5432/postgres
I need to connect spring boot application in one docker container to a Cassandra database in another container.
There are two ways.
"scripted" approach, where you first docker run cassandra container, then you docker run your app. You have to make sure first container exposes ports second container can connect to, or while starting second container reference ports from first by name
use docker compose, that should more or less look like this:
version: '2'
services:
cassandra:
image: cassandra:3.11.5
ports:
- 7000:7000
springapp:
image: springapp:latest
ports:
- 8080:8080
environment:
CASSANDRA_CONTACTPOINTS: 127.0.0.1
CASSANDRA_PORT: 7000