How to Connect to a Remote Docker Daemon ?

 

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Pre-Requisite: 

==> HOW TO INSTALL DOCKER IN WINDOWS AND MAC

==> How to create Docker Image From Scratch

Docker architecture

Docker uses a client-server architecture. The Docker client talks to the Docker daemon, which does the heavy lifting of building, running, and distributing your Docker containers. 

The Docker client and daemon can run on the same system, or you can connect a Docker client to a remote Docker daemon. 

The Docker client and daemon communicate using a REST API, over UNIX sockets or a network interface. Another Docker client is Docker Compose, that lets you work with applications consisting of a set of containers.

The Docker daemon

The Docker daemon (dockerd) listens for Docker API requests and manages Docker objects such as images, containers, networks, and volumes. A daemon can also communicate with other daemons to manage Docker services.

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==> How to create DOCKER IMAGE from SCRATCH <==
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Pre-Requisite:

• A Ubuntu 18.04 installed on one of VM instance
• Install Docker

Create the directory to store the configuration file.

sudo mkdir -p /etc/systemd/system/docker.service.d

Create a new file to store the daemon options.

sudo nano /etc/systemd/system/docker.service.d/options.conf

==> How to create your first Docker Image using Java?

Now make it look like this and save the file when you're done:

[Service]
ExecStart=
ExecStart=/usr/bin/dockerd -H unix:// -H tcp://0.0.0.0:2375

Now, reload the systemd daemon and restart the docker service:

# Reload the systemd daemon.
sudo systemctl daemon-reload

# Restart Docker.
sudo systemctl restart docker

That’s going to let you continue to connect to the Docker daemon from within the VM thanks to -H unix://, but it also exposes the Docker Daemon with -H tcp://0.0.0.0:2375 so that anyone can connect to it over the non-encrypted port.

Configuring your dev box to connect to the remote Docker daemon:

If you want to set DOCKER_HOST by default so it always connects remotely you can export it in your ~/.bashrc file. Here’s an example of that as a 1 liner:

echo "export DOCKER_HOST=tcp://X.X.X.X:2375" >> ~/.bashrc && source ~/.bashrc

That just adds the export line to your .bashrc file so it’s available every time you open your terminal. The source command reloads your bash configuration so it takes effect now.

Top 18 Docker Commands For Daily Usage

Testing

You can test the configuration using a simple curl command, like the following:

curl <docker-host-ip>:2375/v1.38/containers/json 

If you have any running containers, you will receive a non-empty json response.

Congratulations, you’re now able to connect to a remote Docker daemon.

Source: collabnix/dockerlabs

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