1. Kube-for-mac Hey Look It's Kubernetes On Docker For Mac

Published on October 11, 2018 Google created to help developers better manage their containerized applications across clusters. Although a beta version was released in 2014, the first stable release of Kubernetes was just made available in September 2018. The following Kubernetes tutorial will cover the basic architecture and uses for this popular new tool. The Need for Containerization Today’s internet users don’t tolerate downtime, so developers have had to find ways to perform maintenance and updates without interrupting their services. Containers, or isolated environments that include everything needed for an application to run, make it easy for developers to edit and deploy apps on the fly.

Oct 12, 2018 - Each components has its own resources and can be scaled individually. Each instance has Docker Community Edition (CE) and Kubeadm already. First one can search for application stack using helm search. To swarm clusters, even if Kubernetes is enabled in Docker for Mac. Oct 25, 2018 - This is what is advertised to my container in docker/kube. From within that network, docker.for.mac.localhost is reachable. But as the above doc explain, Docker for Mac implementation is all about making it appear to the user as if there. Docker/kubernetes is on it's on network within my machine, as per. Last night I got Kubernetes running on Docker for Mac. I'm not sure if this is evil or not yet. Certainly both the Docker and Kubernetes teams tell you not to do it. Use at your own risk. ¯ _(ツ)_/¯ I like to start with a Docker factory reset first. Because then you know where the button is.

Thus, containerization has become a preferred method for packaging, deploying and updating distributed web applications. Of course, managing such apps across more than one machine can get complicated very quickly.

That’s why Google set out to develop an open source system that would simplify the “deployment, scaling and operations” of containerized applications across multiple hosts. The result was Kubernetes, which allows developers to create and manage “clusters” of physical and virtual machines in order to coordinate cooperation via a shared network.

The Benefits of Kubernetes Kubernetes alleviates the burdens of manually managing your containers in a large scale production environment. If set up properly, Kubernetes can save developers time and money by automating infrastructure resource management. For example, when an instance fails, Kubernetes automatically re-creates it. The end result is a smoother user experience and less downtime for your apps. Using Kubernetes comes with a learning curve, but the rewards are well worth the effort. Kubernetes Architecture A Kubernetes cluster is a network of containers capable of communicating with each other.

You can have a small cluster that runs on just one machine, or you can make massive clusters that operate across several machines. Machines in a cluster are assigned specific roles.

Kube-for-mac Hey Look It's Kubernetes On Docker For Mac

A Kubernetes cluster typically consists of: The Master Server The master server is the primary machine responsible for facilitating communication between the cluster’s different components. The master server uses what’s called a declarative plan to run applications most efficiently using the available infrastructure. Nodes The other machines in a Kubernetes cluster act as nodes that perform workloads with the assistance of local and external resources. Nodes communicate with the master through an agent called a kubelet.

Configuration data for each node is stored in a distributed key-value store known as etcd. A Container Runtime Each node must have a container runtime, such as Docker, to process instructions from the master server. Docker’s job, of course, is to create and manage containers. A Network Containers need a network and IP addresses to facilitate communication.

Web developers have several to choose from. The Kubernetes API End users can interact with the cluster via the main API, and developers control their containerized applications using a command line tool called. These components all work together to ensure that the desired state of an application matches the state of the cluster. A deeper look into Kubernetes’s inner workings could take up several web pages. Fortunately, the official has all of that information.

The Kubernetes website also has several interactive tutorials. Objects and Workloads The Kubernetes object model provides primitives allowing developers to define workloads, facilitate scaling and interact with objects. These are the main types of objects and workloads you’ll be dealing with: Pods Containers are themselves contained in objects called pods. Pods are made up of one or more containers that work together and share a life cycle on the same node. For example, a pod may consist of a main container that runs the application server and a helper container responsible for retrieving files when it detects changes to external repositories. Kubernetes clusters manage each pod as a single unit. Replication Controllers and Sets Replication controllers and replication sets make horizontal scaling possible by defining pod templates and creating replicas to distribute workloads.

Deployments Deployments are the high-level objects that developers work with directly to manage the life cycles of pods. They describe the desired state of an application. When deployments get modified, Kubernetes automatically adjusts all replica sets, which makes it possible to perform updates without affecting application availability.

Services Pods are only accessible within their Kubernetes cluster, so to make your applications available to the outside word, pods must be exposed as services. A Kubernetes service groups together related pods and presents them to end users as a single entity. Getting Started With Kubernetes Before you can start creating clusters with Kubernetes, you must download and install several things.

For the purposes of this tutorial, we’ll need:., a lightweight distribution that lets you run Kubernetes clusters locally. A virtualization software like., the command line client for Kubernetes. A container runtime like Creating a Cluster Let’s learn how to create a simple cluster using Kubernetes. We’ll use Minikube to create a small virtual machine and deploy a cluster with just one node. Install VirtualBox and follow the installation instructions for your OS.

Alternatively, you can use KVM2 or any hypervisor you prefer. 2 Install Kubectl Kubectl is how you, the developer, interact with your clusters. You can and find installation instructions on the Kubernetes website. Install Docker If you don’t already have it set up, download and install.

Linux users can consult the to find installation instructions for their distribution. Install Minikube See the for everything you need to set up Minikube for Windows, Mac or Linux. Run Minikube After all that set up, creating a cluster requires just a single step.

From the command line, enter: minikube start Now, to confirm that your cluster is running, enter: kubectl get nodes If done correctly, you should see some information about your cluster such as its status and a version number. Configuring Kubectl If you followed the steps above and installed Minikube, then kubectl should have automatically configured itself to access the cluster you created. You can confirm this with the following command: kubectl cluster-info The /.kube/config file defines which API endpoints and clusters kubectl can access. Determining which cluster kubectl interacts with is referred to as “setting the context.” To see all of your available contexts, use this command: kubectl config use-context minikube You can change the context using the KUBECONFIG variable. If everything was correctly configured, you should be able to open the Kubernetes dashboard in a browser with this command: minikube dashboard The Kubernetes Dashboard The Kubernetes dashboard tells you everything you need to know about your cluster. To determine if your dashboard is up and running, enter this command: kubectl get pods -n kube-system Look for an entry that begins with kubernetes-dashboard.

Before you can view your dashboard, you must run the following command to proxy to the API: kubectl proxy Now, the Kubernetes API will be available at To open your dashboard in a browser, visit the following url: Source: Creating a Service As mentioned earlier, pods are initially only accessible via their internal IP addresses within a cluster. To make your containers accessible outside of Kubernetes, pods must be exposed as services. A Kubernetes service is basically an internal load balancer that serves as an ambassador for pods. To expose a pod, use this kubectl command: kubectl expose deployment hello-node -type=LoadBalancer The -type=LoadBalancer flag lets Kubernetes know that you want to expose the service to the public. Just replace hello-node with the name of your application’s container.

You can view your newly created service with this command: kubectl get services If your cloud provider supports load balancers, you may be given an external IP address to access the service. If you’re using Minikube, the -type=LoadBalancer flag makes your service accessible via the minikube service command. Summary Considering the tool’s complexity and usefulness, it’s hard to believe that Kubernetes is an open source tool. Don’t be intimidated by the seemingly complex architecture and confusing spelling. If you’re working on a big project across multiple machines, Kubernetes can make your life a lot easier.