Docker Tutorial – Docker Container Tutorial for Beginners
In this Docker tutorial for beginners, we’re going to be running our first Docker container in production. You’ll get to see just how quick, simple, and STABLE it is to use Docker for deploying your web applications.
We’re going to spin up a Digital Ocean server (get $10 free digital ocean credit if you sign up here:
Then, we’re going to run a basic web server container that was built from a Dockerfile. This webserver Docker image can be run on our server as one or more containers. If we had a cluster of Docker machines, we could run many of these containers seamlessly.
High-Availability Docker #1:
– Cluster computing – CoreOS is our solution here. CoreOS allows us to make an expandable cluster of computers so we can add more computers should our application need more power to scale. CoreOS also allows us to run services on any machine in the cluster and they can all communicate with each other.
High-Availability Docker #2:
– Scheduling: we shouldn’t manually choose which app runs on which machine – this thought doesn’t work at scale. Fleet will be our scheduler that decides where our apps/services run. If a CoreOS machine goes down, fleet will reschedule any services that it was running onto a new machine.
High-Availability Docker #3:
– Service Registration
Since we never know what ip address or port a service will be running on, we need to register that service so other services can find it and communicate with it. We’ll use Etcd and Flannel for this
High-Availability Docker #4:
– Service Discovery:
Now that services have registered, we can learn them and load balance between them with a generic docker nginx container
High-Availability Docker #5:
– Public DNS: Once the app is working, we need a fixed way for the outside world to access it. We’ll use Nginx and Confd for this. Confd will watch Etcd for service registration and when services come/go, it will build a new configuration file for Nginx and reload Nginx.
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