Docker Community Forums

Share and learn in the Docker community.

How connect two docker containers

Hello. I have two docker containers with .net core app. First container has exposed port 44333 second 44399.
I can get access localy by exposed port to the images in first docker by localhost:44333/getImages and I got all images. But when my second docker invokes this request localhost:44333/getImages there is an error:
System.Net.WebException: Cannot assign requested address Cannot assign requested address
I tried put this two containers in one network but it does not works.

Second container must connect to first container by using service name instead of localhost. Service name act as dns for the given container which should be used to call them.

1 Like

You will need a Linode with Docker CE installed to follow along with the steps in this guide.

These steps install Docker Community Edition (CE) using the official Ubuntu repositories. To install on another distribution, or to install on Mac or Windows, see the official installation page.

Remove any older installations of Docker that may be on your system:

sudo apt remove docker docker-engine
Make sure you have the necessary packages to allow the use of Docker’s repository:

sudo apt install apt-transport-https ca-certificates curl software-properties-common gnupg
Add Docker’s GPG key:

curl -fsSL | sudo apt-key add -
Verify the fingerprint of the GPG key:

sudo apt-key fingerprint 0EBFCD88
You should see output similar to the following:

pub rsa4096 2017-02-22 [SCEA]
9DC8 5822 9FC7 DD38 854A E2D8 8D81 803C 0EBF CD88
uid [ unknown] Docker Release (CE deb)
sub rsa4096 2017-02-22 [S]

Add the stable Docker repository:

sudo add-apt-repository “deb [arch=amd64] $(lsb_release -cs) stable”
For Ubuntu 19.04, if you get an E: Package ‘docker-ce’ has no installation candidate error, this is because the stable version of docker is not yet available. Therefore, you will need to use the edge / test repository.

sudo add-apt-repository “deb [arch=amd64] $(lsb_release -cs) stable edge test”
Update your package index and install Docker CE:

sudo apt update
sudo apt install docker-ce
Add your limited Linux user account to the docker group:

sudo usermod -aG docker $USER
After entering the usermod command, you will need to close your SSH session and open a new one for this change to take effect.
Check that the installation was successful by running the built-in “Hello World” program:

docker run hello-world