docker-compose redis and redis commander - docker

Question

I use the windows docker toolbox and I am confused what I am missing. I want to use redis commander (https://www.npmjs.com/package/redis-commander) with a docker image redis from the docker hub.
I used the docker-compose.yml from above link:
version: '3'
services:
redis:
container_name: redis
hostname: redis
image: redis
redis-commander:
container_name: redis-commander
hostname: redis-commander
image: rediscommander/redis-commander:latest
build: .
restart: always
environment:
- REDIS_HOSTS=local:redis:6379
ports:
- 8081:8081
Now I can start the app with the toolbox IP on port 8081
Ther it says undefined redis server: local:redis:6379:0
Since I am using the toolbox I assume I have to put some IP correct in the compose file.
Using redis alone with $ docker run --name some-redis -d redis
works and I can reach the server und er local:6379
But what means REDIS_HOSTS=local:redis:6379
Any help to set this up correctly?

Answer 1

For fix that you need link redis and redis-commander like that:
version: "3.9"
services:
redis:
image: redis:6.2.5
command: redis-server --requirepass ${REDIS_PASSWORD}
volumes:
- redis:/var/lib/redis
- redis-config:/usr/local/etc/redis/redis.conf
ports:
- ${REDIS_PORT}:6379
networks:
- redis-network
redis-commander:
image: rediscommander/redis-commander:latest
restart: always
environment:
REDIS_HOSTS: redis
REDIS_HOST: redis
REDIS_PORT: redis:6379
REDIS_PASSWORD: ${REDIS_PASSWORD}
HTTP_USER: root
HTTP_PASSWORD: root
ports:
- 8081:8081
networks:
- redis-network
volumes:
redis:
redis-config:
networks:
redis-network:
driver: bridge
or that:
version: "3.9"
services:
redis:
image: redis:6.2.5
command: redis-server --requirepass ${REDIS_PASSWORD}
volumes:
- redis:/var/lib/redis
- redis-config:/usr/local/etc/redis/redis.conf
ports:
- ${REDIS_PORT}:6379
links:
- redis-commander
redis-commander:
image: rediscommander/redis-commander:latest
restart: always
environment:
REDIS_HOSTS: redis
REDIS_HOST: redis
REDIS_PORT: redis:6379
REDIS_PASSWORD: ${REDIS_PASSWORD}
HTTP_USER: root
HTTP_PASSWORD: root
ports:
- 8081:8081
volumes:
redis:
redis-config:

Answer 2

i think you missed to link your 2 containers.
the redis container needs a port + link and the redis-commander the correct environment.
you can only use the container name for the link/environment.
version: '3'
services:
redis:
container_name: redis
hostname: redis
image: redis
ports:
- "6379:6379"
links: redis-commander
redis-commander:
container_name: redis-commander
hostname: redis-commander
image: rediscommander/redis-commander:latest
build: .
restart: always
environment:
- REDIS_HOSTS=redis
ports:
- "8081:8081"

Answer 3

REDIS_HOSTS=local:redis:6379 means it will create config file to connect to docker container with the hostname redis on port 6379 and will have the connection name or label as local.
REDIS_HOSTS is used when you want to have multiple connection, separated by comma.
There are some ways to write REDIS_HOSTS as mentioned in the documentation.
hostname
label:hostname
label:hostname:port
label:hostname:port:dbIndex
label:hostname:port:dbIndex:password
Example:
Let say you want to use redis for two app called app1 and app2. app1 will have the db index 1, app2 will have the db index 2. The REDIS_HOSTS would look like:
REDIS_HOSTS=app1:redis:6379:1,app2:redis:6379:2
The working docker-compose.yml you could use (add network):
version: '3'
services:
redis:
container_name: redis
hostname: redis
image: redis
networks:
- redis_network
redis-commander:
container_name: redis-commander
hostname: redis-commander
image: rediscommander/redis-commander:latest
build: .
restart: always
environment:
- REDIS_HOSTS=local:redis:6379
ports:
- 8081:8081
networks:
- redis_network
networks:
redis_network:
driver: bridge