Connect to Redis Docker container from Vagrant machine - docker

Question

We're making move to Docker from Vagrant.
Our first aim is to move some services out first. In this case I'm trying to host a redis server on a docker container and connect to it from my vagrant machine.
On the vagrant machine there is an apache2 webserver hosting a Laravel App
It's the connection part I'm struggling with, currently I have
Dockerfile.redis
FROM redis:3.2.12
RUN redis-server
docker-compose.yml (concatenated)
version: '3'
services:
redis:
build:
context: .
dockerfile: Dockerfile.redis
working_dir: /opt
ports:
- "6379:6379"
I've tried various way to connect to this:
Attempt 1
Using the host ip 10.0.2.2 in the config in Laravel. Results in a "Connection refused"
Attempt 2
Set up a network in the docker compose
redis:
build:
context: .
dockerfile: Dockerfile.redis
working_dir: /opt
network:
- app_net:
ipv4_address: 172.16.238.10
ports:
- "6379:6379"
networks:
app_net:
driver: bridge
ipam:
driver: default
- subnet: 172.16.238.0/24
This instead results in timeouts. Most solutions seem to require a gateway configured on the network, but this isn't configurable in docker compose 3. Is there maybe a way around this?
If anyone can give any guidance that would be great, most guides talk about connect to dockers in a vagrant rather than from one.
FYI - this is using Docker for Mac and version 3 of docker compose

Answer 1

We were able to get this going use purely docker compose and not having a dockerfile for redis at all:
redis:
image: redis
container_name: redis
working_dir: /opt
ports:
- "6379:6379"
Once done like this, able to connect to redis from within the vagrant file using
redis-cli -h 10.0.2.2
Or as the following in laravel, although we're using environment variables to set these)
'redis' => [
'client' => 'phpredis',
'default' => [
'host' => '10.0.2.2',
'password' => null,
'port' => 6379,
'database' => 0,
]
]

Answer 2

Your Attempt 1 should work actually. When you create a service without defining a network, docker-compose automatically creates a bridge network. For example:
When you run docker-compose up on this:
version: '3'
services:
redis:
build:
context: .
dockerfile: Dockerfile.redis
working_dir: /opt
ports:
- "6379:6379"
docker-compose creates a bridge network named <project name>_default, which is docker_compose_test_default in my case, as shown below:
me#myshell:~/docker_compose_test $ docker network ls
NETWORK ID NAME DRIVER SCOPE
6748b1ea4b85 bridge bridge local
4601c6ea30c3 docker_compose_test_default bridge local
80033acaa6e4 host host local
When you inspect your container, you can see that an IP has already been assigned to it:
docker inspect e6b196f952af
...
"Networks": {
"bridge": {
...
"Gateway": "172.18.0.1",
"IPAddress": "172.18.0.2",
You can then use this IP to connect from the host or your vagrant box:
me#myshell:~/docker_compose_test $ redis-cli -h 172.18.0.2 -p 6379
172.18.0.2:6379> ping
PONG