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Docker For Mac Experimental Mode10/14/2021
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. This was the first time Kubernetes version 1.9.6 & Docker Compose 1.21.0 was introduced under any Docker Desktop edition. Docker for Mac 18.04.0 CE Edge Release went GA early last month. Experimental mode is listed under Server.
![]() Docker Experimental Mode Software Developers To#1: Docker for Mac support Docker Swarm, Swarm Mode & KubernetesStarting from Docker for Mac 17.12 CE Edge Release, Docker Inc introduced a standalone Kubernetes server and client, as well as Docker CLI integration. This is not the right time for software developers to experiment with Apple.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. 2.So you can run x86 Mac apps, but its likely x86 Docker images will be.This variable can be unset (the default, in which case Kubernetes is the orchestrator) or set to swarm or kubernetes.2-minutes to Kubernetes Cluster on Docker for Mac 18.01 using Swarm CLI#2: You can use the same Docker Compose to build Swarm & Kubernetes ClusterYes, you read it correct. Starting from Docker for Mac 17.12, Docker introduced a new type called “Stack” under compose.docker.com. You can use the DOCKER_ORCHESTRATOR variable to override the default orchestrator for a given terminal session or a single Docker command. 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. Docker “Moby” on Hyperkit serves as the single swarm node. 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. When Kubernetes support is enabled, you can deploy your workloads, in parallel, on Kubernetes, Swarm, and as standalone containers.#4: Support for NFS Volume sharing under Swarm as well as KubernetesWith Docker for Mac 18.03 release, NFS Volume sharing support for both Swarm & Kubernetes was introduced. This means that now you can run containers for different Linux architectures, such as arm, mips, ppc64le, and even s390x. Clone the Repository $git clone Change to the right location $cd docker101/play-with-kubernetes/examples/stack-deploy-on-mac/Example-1 : Demonstrating a Simple Web Application Building the Web Application Stack $docker stack deploy -c docker-stack1.yml myapp1Verifying using Kubectl $kubectl get podsVerifying if the web application is accessible $curl localhost:8083Cleaning up the Stack $docker stack rm myapp`Example:2 – Demonstrating ReplicaSet Building the Web Application Stack $docker stack deploy -c docker-stack2.yml myapp2Ajeets-MacBook-Air:testenviron ajeetraina$ kubectl get stacksAjeets-MacBook-Air:testenviron ajeetraina$ kubectl get podsAjeets-MacBook-Air:testenviron ajeetraina$ kubectl get stacks myapp2 -o yamlSelfLink: /apis/compose.docker.com/v1beta2/namespaces/default/stacks/myapp2Uid: b25bf776-03d6-11e8-8d4c-025000000001Cleaning up the Stack $docker stack rm myapp25 Minutes to Bootstrap Kubernetes Cluster on GKE using Docker for Mac 18.03.0#3: Docker for Mac provides Multi-Architecture SupportDocker for Mac provides binfmt_misc multi architecture support. Let me showcase an example which shows how one can use the same YAML file to build Swarm Mode as well as K8s cluster. It convert docker-compose files to k8s manifests (something like kompose) before deployment. 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.![]() Docker for Mac VM is entirely built with LinuxKitHow to enter into LinuxKit VM? $screen ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/ttyLinuxkit-025000000001:~# cat /etc/os-release000-metadata 0 stopped /containers/onboot/000-metadata T06:27:44.345735031Z root001-sysfs 0 stopped /containers/onboot/001-sysfs T06:27:44.768313965Z root002-binfmt 0 stopped /containers/onboot/002-binfmt T06:27:45. Check it out.Context Switching Made Easy under Kubernetes powered Docker for Mac 18.02.0Other attractive features of Docker for Mac 18.04 includes – Enable Kubernetes under Preference Pane UICd docker101/for-mac/nfs Execute the below script on your macOS system sh env_vars.shWARNING: This script will shut down running containers.The nfsd service does not appear to be running.Bringing up Your Application docker stack deploy -c docker-compose.yml myapp2NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGEKubernetes ClusterIP 10.96.0.1 443/TCP 1d? > kubectl describe po web-0Container ID: docker://ec9ad2a3192bdeb0cc5028453310f40fd0ac3595021b070465c4e7725f626d63/var/run/secrets/kubernetes.io/serviceaccount from default-token-n8trf (ro)Type: PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)Type: Secret (a volume populated by a Secret)Tolerations: node.kubernetes.io/not-ready:NoExecute for 300sNode.kubernetes.io/unreachable:NoExecute for 300sNormal Scheduled 5m default-scheduler Successfully assigned web-0 to docker-for-desktopNormal SuccessfulMountVolume 5m kubelet, docker-for-desktop MountVolume.SetUp succeeded for volume "pvc-bbdc7903-3dad-11e8-a612-025000000001"Normal SuccessfulMountVolume 5m kubelet, docker-for-desktop MountVolume.SetUp succeeded for volume "default-token-n8trf"Normal Pulled 5m kubelet, docker-for-desktop Container image "alpine:3.6" already present on machineNormal Created 5m kubelet, docker-for-desktop Created containerNormal Started 5m kubelet, docker-for-desktop Started container#5: Docker for Mac support context switching from docker-for-desktop to Cloud instances in a matter of a ClickStarting 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. Install Docker for Mac 18.03 and future version
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