Windows server containers
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The document discusses the evolution and implementation of Docker containers, highlighting their benefits such as scalable deployment, resource efficiency, and ease of use in microservices. It covers the introduction of Docker in 2013, deployment steps, and integration with various tools, along with specific details on Windows Server Container capabilities. Limitations of Docker, particularly when transitioning between Linux and Windows environments, are also outlined.
Windows server containers
- 1. Vishwanath Srikanth DevOps Engineer, Microsoft
- 2. Physical Servers ContainersVirtual Servers • Space/Scaling Constraints • Higher Provisioning Time • Over/Under Utilization • Maintenance Hypervisor/Hosted Hypervisor • Scalable, Lesser Provisioning Time, Scale up/down easy, Less Maintenance. • Bare Metal - VMware, Hypervisor, Xen • Hosted – Virtual PC, Virtual Box etc.1965 & Before 1965 & After Bare Metal/Traditional OSBare Metal/Traditional OS Hypervisor/Hosted Hypervisor Guest Operating System Guest Operating System Containers 2013 & Future • 2013: Docker Introduced Containers, followed by MS in WS2016 (Aug-2015) • Easily Shippable • Complete Isolation • Very less turn up times • Programmable Virtualization Trends
- 3. www.docker.com • An Open Source framework built by Solomon Hykes and team @dotCloud to build, manage and deploy containers on Linux. • Written using Go (Google) Programming Language • Standardized in collaboration with Amazon, Cisco, Google, VM Ware and Microsoft and works consistently across all major Linux Brands. OCI – Open Container Initiative • Docker is built using LXC, namespaces, CGroups features on Linux. • Open Source, 2013: https://www.docker.com/contribute, 400 Million downloads so far. • Steps to deploy a Docker container. • Developers build application and package as Docker containers. These containers are published as images to Docker Hub or Private Image repository or Host Machine. • Containers are deployed on Linux Machine with Docker Engine Installed using any image repository. The images in repositories are inherently discoverable. • The Docker Engine on Host Machine can be invoked remotely via Docker CLI. • Docker enabled Linux Machines are available on Azure Image Gallery. VS can be used to perform 1-Click deployment to Docker machines. • Docker also gels very well with Machine configuration tools like Puppet, Chef, Vagrant and Ansible. C C C Docker Engine (Linux) Docker Hub/Private Image Repository C Build Applications Package using Docker CLI Publish Deploy
- 4. Windows Server Containers • Docker Engine for Windows Server available on Windows Server 2016 CTP 3 (Container Role) – Aug 2015. • Create, Build and Manage Containers using PowerShell or Docker (CLI) – Platform agnostic Docker Commands. • Visual Studio tools for Docker available as an Extension to VS 2015 enables on click deployment to Docker enabled Windows/Linux Machines. • Docker Engine re-written for Windows Open Sourced (libcontainer) is also open sourced – First Time Ever !! • Docker Engine on Windows uses namespaces isolation and resource governance for container isolation. • Windows Server Container Preview available on Azure Today !! (No GUI)
- 5. Use Cases for Containers Micro services: Containerized app can be converted to Images, multiple containers can be deployed using image within seconds. Apt for light-weight portable apps like micro services. Higher Utilization: Since a VM can be used to host Multiple applications in isolated containers. Easy to Scale: Container Images can used to scale the application to N instances within seconds. Easy Procurement: Since the kernel is already heated up, application deployment does not have to wait for full OS boot times. Reusability: One can easily deploy a container install custom applications (Redis, MySQL etc.) from Docker Host, customize the configuration and image it out and use many times.
- 6. Getting Started • Create a HOST Machine • Create a “Windows Server Container Preview” machine from Azure Image Gallery. (Recommended) • Create a “Windows Server 2016 CTP3” login and enable Container Role. • Preparing Dev Machine • Download Docker Tools for VS 2015 from here. • Quick Start Guides: https://msdn.microsoft.com/virtualization/windowscontai ners/containers_welcome PS Sample for Installing NGINX on WSC
- 7. Limitations Docker Containers created on Linux cannot be ported to windows. Docker Containers cannot be managed using PS library for Windows. ASP.NET 4.5 and below does not run on WSC yet, only option is ASP.NET 5.0. Not all Docker commands work today. If the OS needs patchingupgrade, the changesupgrade might ripple into containers as well • Hyper-V Containers: VMs have their own OS kernel files and memory • Hyper-V Containers can be managed using Docker, WSC can be deployed as Hyper-V Containers. • Better Security with Hyper-V Containers • MS working on Nano servers 1/20th size of previous servers specially designed for containers/Micro Services Hyper-V Containers