Windows Server Insiders Build 16257 Adds WSL, RSAT, New SDK & Mobile Emulator Builds Released

Windows Subsystem for Linux along with a compliment Linux distributions, new Windows 10 SDK Preview Build 16257, Mobile Emulator Build 15235 released.

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Windows Server

The second Insider Preview Build 16257 of Windows Server pushed to those register at the Windows Insiders for Business program or Windows Insider program, on Tuesday, includes Remote Server Administration Tools (RSAT) packages.

"RSAT, when installed on a Windows 10 client, allows users to remotely manage and administer Insider builds of Windows Server via GUI tools." The tool is valid on Windows 10 client builds greater than 16250.

In addition, this release also brings Windows Subsystem for Linux (WSL) along with a compliment of Linux distributions to Windows Server. Microsoft notes, that at this time, WSL doesn't support persistent Linux services such as daemons and jobs as background tasks.

For those new to Server, "WSL runs unmodified Linux (ELF64) binaries natively, and let you run node.js, Ruby, Python, Perl, Bash scripts or other tools that expect Linux behaviors, environment, or filesystem-layout."

To enable WSL and install a Linux distribution, see Enable Windows Subsystem for Linux and Install a Linux distribution in the Windows Server 2016 Installation Guide on GitHub.

New Linux environment on Windows Server
New Linux environment on Windows Server

Those interested can navigate to Windows Server Insider Preview download page, where the latest build and matching symbols are available. Also, Matching Windows Server container images will be available via the Docker Hub.

Microsoft has also provided free license keys for unlimited activations, and can be used throughout the pre-release cycle of Windows Server.

Server Datacenter Core: B69WH-PRNHK-BXVK3-P9XF7-XD84W

  • Server Standard Core: V6N4W-86M3X-J77X3-JF6XW-D9PRV

  • Windows 10 SDK Preview Build 16257 and Mobile Emulator Build 15235 released today, can be downloaded from developer section on Windows Insider.

    See the full changelog of the build 16257 below, General Scenario Highlights:

    Developers and Containers:

    • New base container images (available on Windows Insider Docker Hub repo)
      • Optimized Nano Server base image (over 70% smaller)
        • The .NET team is providing a preview image based on Nano Server with .NET Core 2.0
        • The PowerShell team is providing a preview image based on PowerShell 6.0
      • Optimized Server Core base image (over 20% smaller)
    • Support for SMB volume mounting
    • Infrastructure for Orchestrators
      • Networking enhancements for ongoing Kubernetes work
      • Named pipe mapping support
    • Bug fixes, performance enhancements

    Cloud Guest:

    • IIS
      • TLS info: administrators can make specific recommendations to default to HTTPS
    • Disaster Recovery
      • Storage Replica Test Failover
    • Guest + Host better together
      • vPMEM in Guest: Tenants can use and manage PMEM/SCM
      • Tenant-Aware VM Start Ordering: App Ready / OS Heartbeat for better load balancing
      • Guest RDMA
    • Improvement in time accuracy
    • Azure enlightened clusters – optimized to run on Azure IaaS

    Cloud Host:

    • Software Defined Data Center (SDDC) host
      • Security
        • Shielded Linux VM
        • SDN: Encrypted virtual networks
        • Secure clusters
        • SMB 1 disabled by default
      • Resiliency and Availability
        • SDN: Reduced downtime for tenant connections through gateways
        • Spaces Direct: Scoped Spaces to mitigate impact of multi-node loss
        • Spaces Direct: Marginal drive handling for predictive detection of drive failures
      • Efficiency
        • Data Deduplication available for ReFS
        • New Data Deduplication DataPort API for optimized ingress/egress
        • Space efficiency with ReFS Compaction
        • Performant Spaces Direct Multi Resilient Volumes (MRV)
      • Hyper-converged Scale
        • Cluster Sets: Significantly increases hyper-converged SDDC cloud scale by grouping multiple clusters into a larger fabric
      • Hardware support
        • Support for Storage Class Memory (SCM) in Spaces Direct