Docker connect to remote box through host port forwarding

dockerport-forwarding

So, i have a Docker container with an app that needs to connect to Redis instance on remote machine. There is no direct connection to that Redis host from Docker container or from Docker host, but i can establish port forwarding from Docker host to that Redis box.

Port forwarding established on Docker host: ssh -L 8810:REDIS_HOST:6379 someUser@someHost

Docker Container (App) -> requests to localhost:8810 or to DOCKER_HOST_IP:8810 
 isn't forwarded to REDIS_HOST.

Do i need to modify somehow DOCKER_HOST port forwarding or it's hosts file to make that work?

Best Answer

It turns out that you need to add -g to SSH port forwarding and then use DOCKER_HOST ip to make requests from App in the container

Related Solutions

Docker – connecting from docker container to docker host

All you need is Docker's link capabilities [deprecated]

Just get rid of all the complicated stuff you tried to do and start using named containers and then link them to each other.

Iptables – Forwarding a port on the loopback interface to a remote IP/port

I would use socat for that:

socat TCP-LISTEN:6379,fork TCP:10.1.0.2:6379

You might want to run this using supervisor or a similar tool. On ubuntu:

apt-get install socat supervisor

cat > /etc/supervisor/conf.d/redis-socat.conf << EOF
[program:redis-socat]
command = socat TCP-LISTEN:6379,fork TCP:10.1.0.2:6379
autorestart = true
user = nobody
EOF

supervisorctl reload

Now you can start/stop the redis-socat process using:

supervisorctl start redis-socat 
supervisorctl stop redis-socat

It will also automatically start at boot time.

Best Answer

Related Solutions

Docker – connecting from docker container to docker host

Iptables – Forwarding a port on the loopback interface to a remote IP/port

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