You can also use Docker Machine, which comes with Docker for Mac, to create and experiment a multi-node swarm. While testing Kubernetes.

Docker for Mac 18.04.0 CE Edge Release went GA early last month. This was the first time Kubernetes version 1.9.6 & Docker Compose 1.21.0 was introduced under any Docker Desktop edition. ICYMI – Docker for Mac VM is entirely built with LinuxKit, hence this was the first release which enabled the RBD and CephFS kernel modules under LinuxKit VM. In case you’re new to RBD, the linux kernel RBD (rados block device) driver allows striping a linux block device over multiple distributed object store data objects. Usually the libceph module takes care of that.This release brought a number of fixes around upgrades from Docker for Mac 17.12, synchronisation between CLI `docker login` & GUI login, support for AUFS and much more.

Under this blog post, I will talk about top 5 exclusive and very useful features of Docker of Mac that you can’t afford to miss out.

#1: Docker for Mac support Docker Swarm, Swarm Mode & Kubernetes

Starting from Docker for Mac 17.12 CE Edge Release, Docker Inc introduced a standalone Kubernetes server and client, as well as Docker CLI integration. The Kubernetes server runs locally within your Docker instance, is not configurable, and is a single-node cluster.

One of the most anticipated feature introduced with this release was the Kubernetes server running within a Docker container on your local system. When Kubernetes support is enabled, you can deploy your workloads, in parallel, on Kubernetes, Swarm, and as standalone containers. Enabling or disabling the Kubernetes server does not affect your other workloads.

You can use Docker for Mac to test single-node features of swarm mode introduced with Docker Engine 17.12, including initializing a swarm with a single node, creating services, and scaling services. Docker “Moby” on Hyperkit serves as the single swarm node. You can also use Docker Machine, which comes with Docker for Mac, to create and experiment a multi-node swarm.

While testing Kubernetes, you may want to deploy some workloads in swarm mode. You can use the DOCKER_ORCHESTRATOR variable to override the default orchestrator for a given terminal session or a single Docker command. This variable can be unset (the default, in which case Kubernetes is the orchestrator) or set to swarm or kubernetes.

https://asciinema.org/a/179186

Check out my blog post:

#2: You can use the same Docker Compose to build Swarm & Kubernetes Cluster

Yes, you read it correct. Starting from Docker for Mac 17.12, Docker introduced a new type called “Stack” under compose.docker.com. This object, that you can create with kubectl or more easily with docker stack deploy, contains the compose file.Behind the scene, a controller watches for stacks and create/update corresponding kubernetes objets (deployments, services, etc). The job of the controller is to reconcile the stacks (stored in the api-server or crd) with k8s native object.

The docker stack deploy manages to deploy to K8s. It convert docker-compose files to k8s manifests (something like kompose) before deployment. Let me showcase an example which shows how one can use the same YAML file to build Swarm Mode as well as K8s cluster. U2 ee cam driver for mac download.

Clone the Repository

Change to the right location

Example-1 : Demonstrating a Simple Web Application

Building the Web Application Stack

Verifying the Stack

Verifying using Kubectl

Verifying if the web application is accessible

Cleaning up the Stack

Example:2 – Demonstrating ReplicaSet

Building the Web Application Stack

Verifying the Stack

Verifying using Kubectl

Verifying if the web application is accessible

Cleaning up the Stack

An Interesting Read:

#3: Docker for Mac provides Multi-Architecture Support

Docker for Mac provides binfmt_misc multi architecture support. This means that now you can run containers for different Linux architectures, such as arm, mips, ppc64le, and even s390x.

https://asciinema.org/a/179189

#4: Support for NFS Volume sharing under Swarm as well as Kubernetes

With Docker for Mac 18.03 release, NFS Volume sharing support for both Swarm & Kubernetes was introduced. To demonstrate this feature, follow the below steps:

Pre-Requisite:

• Install Docker for Mac 18.03 and future version
• Enable Kubernetes under Preference Pane UI

Cloning the Repository

Execute the below script on your macOS system

Bringing up Your Application

#5: Docker for Mac support context switching from docker-for-desktop to Cloud instances in a matter of a Click

Starting from Docker for Mac 18.02 RC release, the context switching feature was introduced which helped developers and operators to switch from docker-for-desktop to any Cloud environment in just a matter of a “toggle”.

I have a detailed blog post published early this year which demonstrates this feature with crystal clear examples. Check it out.

Other attractive features of Docker for Mac 18.04 includes –

• Docker for Mac VM is entirely built with LinuxKit

How to enter into LinuxKit VM?

• Docker for Mac uses raw format VM disks for systems running APFS on SSD on High Sierra by default
• DNS name docker.for.mac.host.internal should be used instead of docker.for.mac.localhost (still valid) for host resolution from containers.

Did you find this blog helpful? Feel free to share your experience. Get in touch with me at twitter @ajeetsraina.

If you are looking out for contribution/discussion, join me at Docker Community Slack Channel.