码头工人网络直接访问容器

Question

I try to migrate from multiple VM with static ip to container based solution.

Now I'm using VM with static ip:

I can ping and telnet my VMs telnet 10.48.0.10 5432 and telnet 10.48.0.11 5432

I want to create a single docker host that allows me to do the same :

It would be great if I can telnet 172.17.0.2 5432 and telnet 172.17.0.3 5432

I try to do it via docker because I want to manage the configuration.

What would be the proper way to do this ? Should I use a TCP Proxy inside a container to manage this ?

Answer 1

The solution is pretty simple.

create a network and bind it to the host

docker network create --subnet=10.0.0.0/24 -o "com.docker.network.bridge.host_binding_ipv4"="0.0.0.0" mynet

then run a container on mynet network

docker run -ti --net=mynet --ip=10.0.0.30 busybox

Now from another computer if you add route to your docker host (192.168.2.156) for this subnet :

sudo route add -net 10.0.0.0 netmask 255.255.255.0 gw 192.168.2.156

You can ping your container ( ping 10.0.0.30 )

Answer 2

If you want to access the containers from your host or from any other server that can get your host, you will need to map each container to a different port in the host server.

docker run -d -p 54321:5432 my_app
docker run -d -p 54322:5432 my_app

So you will can telnet 10.200.0.1 54321 and telnet 10.200.0.1 54322