Could not connect to docker redis container from docker application container with docker-compose - spring

Question

I faced the problem with docker-compose.
I tried a lot of themes here on StackOverflow, but it seems that i tried almost everything, but anyway my app does not work.
I have a docker-compose multiapp configuration with:
application
mysql
redis
The point is that when mysql and redis containers are up, my application that is in container throws an error:
org.springframework.context.ApplicationContextException: Failed to start bean 'springSessionRedisMessageListenerContainer';
nested exception is
org.springframework.data.redis.listener.adapter.RedisListenerExecutionFailedException: org.springframework.data.redis.RedisConnectionFailureException: Unable to connect to Redis;
nested exception is
io.lettuce.core.RedisConnectionException: Unable to connect to localhost/<unresolved>:6379;
nested exception is
org.springframework.data.redis.RedisConnectionFailureException: Unable to connect to Redis;
nested exception is
io.lettuce.core.RedisConnectionException: Unable to connect to localhost/<unresolved>:6379
However, when i launch my application in IDE instead of docker container, everything works well!
so it seems that the problem in Docker, i.e. in container settings. But, on the other hand, the container's application successfully connects to mysql, and the problem is only about redis container.
i'm confused. moreover, i wonder what means in localhost/<unresolved>:6379.
the docker-compose file looks like this:
version: '3.9'
services:
mysql-docker:
container_name: mysql-docker
image: mysql:8.0.31
restart: always
ports:
- "3306:3306"
volumes:
- ${MYSQL_DATA}:/var/lib/mysql
environment:
- MYSQL_DATABASE=${MYSQL_DATABASE}
- MYSQL_USER=${MYSQL_USER}
- MYSQL_PASSWORD=${MYSQL_PASSWORD}
- MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}
env_file:
- ./.env
healthcheck:
test: mysql sys --user=${MYSQL_ROOT_USER} --password=${MYSQL_ROOT_PASSWORD} --silent --execute "SELECT 1;"
interval: 3s
timeout: 10s
retries: 10
networks:
- my-network
redis-docker:
depends_on:
mysql-docker:
condition: service_healthy
container_name: redis-docker
image: redis:7.0.5
restart: always
ports:
- 6379:6379
command: "redis-server --loglevel warning --port ${SPRING_REDIS_PORT} --requirepass ${SPRING_REDIS_PASSWORD}"
volumes:
- ${SPRING_REDIS_DATA}:/var/lib/redis
env_file:
- ./.env
healthcheck:
test: [ "CMD", "redis-cli", "--raw", "incr", "ping" ]
interval: 3s
timeout: 10s
retries: 10
networks:
- my-network
app:
depends_on:
mysql-docker:
condition: service_healthy
redis-docker:
condition: service_healthy
links:
- redis-docker
- mysql-docker
build: ./
restart: on-failure
env_file:
- ./.env
volumes:
- ${SPRING_M2_BUILD_DATA}:/root/.m2
stdin_open: true
tty: true
networks:
- my-network
networks:
my-network:
driver: bridge
Dockerfile for application is not interesting, there is just standart FROM, COPY and RUN gradle clean build.
Properties for redis in application.properties:
spring.redis.host=localhost
spring.redis.port=6379
spring.redis.password=verySecuredPassword
in .env file (it is needed for potential kubernetes):
SPRING_REDIS_PASSWORD=verySecuredPassword
SPRING_REDIS_PORT=6379
SPRING_REDIS_URL=redis://redis-docker:${SPRING_REDIS_PORT}
There are no other config files. As i got, there is no need for them - the application works well when it is not in container.
Moreover, it seems that the problem is not about binding redis to 0.0.0.0 (btw i tried that too - didn't work) - because it refuses only 'dockerized' connections somehow. But i could be wrong, ofc.
I tried redis-cli ping from windows powershell - and got pong. So, the redis obiously works, works correctly (becauseof correctness of application launched into IDE) and accepts connections.
What am i missing?