Working with Docker

In this article, we’ll go through a real quick way of starting a Docker Swarm service without installing and setting up the environment — PWD.

Let’s start playing with Docker in PWD

Play with Docker

Login with you Docker Hub account. Click on start, as shown below.

Play with Docker

Here you see two options to create the Docker instance,

1. Click on the button, ADD NEW INSTANCE, to create a single instance

Adding a New Instance

2. Click on the Wrench to set up five instances of an operating system running Docker.

Docker Instances

You can opt to go with 3 Managers and 2 Workers or 5 Managers and no Workers.

It’s going to connect all five together with the Swarm Kit tooling. All instances are ready to use:

Docker Swarm Kit

Let’s Run a Service of Three replicas

A basic understanding of the Docker run command is a plus if you want to create a Docker service  via the create  command. But, it is fine even if you don’t have experience i this area.

We’re going to type a single command that will create a new Swarm service that runs three instances of the same container across three nodes in a highly available fashion.

We’re going to run a simple Nginx web server and use the default page in Nginx.

docker seervice create --name hello --replicas 3 \

 --detach=false --publish 8000:80 nginx

Default Page in Nginx

As the result of the command you will see the the service is created and you can view it at port 8000.

Nginx Server

Now you can check with the services created in the instances

docker ps -a

Docker Instances

For reading, this may take more time compare to implemention. Let’s jump in and implement it. Have fun playing with Docker.

source: https://dzone.com/articles/play-with-docker-docker-swarm