![]() ![]() Likewise, docker top can be used to return the running processes from the container. docker run -d -isolation=hyperv /windows/servercore:ltsc2019 ping localhost -t To contrast, this example starts a Hyper-V isolated container with a ping process as well. Handles NPM(K) PM(K) WS(K) VM(M) CPU(s) Id SI ProcessName It is the same process visible from both container and host. In this example there is one, and the process id matches that from the container. On the container host, the get-process command can be used to return any running ping processes from the host. The process in this example has an ID of 3964. Using the docker top command, the ping process is returned as seen inside the container. docker run -d /windows/servercore:ltsc2019 ping localhost -t Here, a process-isolated container is being deployed and will be hosting a long-running ping process. This example demonstrates the differences in isolation capabilities between process and Hyper-V isolation. By using this feature on Windows 10 Pro and Enterprise, you must also ensure that your host and container version tags match, otherwise the container may fail to start or exhibit undefined behavior. You should continue to use Windows Server as the host for production deployments. Your host must be running Windows 10 build 17763+ and you must have a Docker version with Engine 18.09 or newer. Running with process isolation on Windows 10 Pro and Enterprise is meant for development/testing. Users must directly request process isolation by using the -isolation=process flag. Starting with the Windows 10 October 2018 update, users running a Windows 10 Pro or Enterprise host can run a Windows container with process isolation. Windows containers running on Windows 10 Pro and Enterprise default to running with Hyper-V isolation. Windows containers running on Windows Server default to running with process isolation. docker run -it -isolation=process /windows/servercore:ltsc2019 cmd To create a container with process isolation through Docker, use the -isolation parameter to set -isolation=process. ![]() docker run -it -isolation=hyperv /windows/servercore:ltsc2019 cmd To create a container with Hyper-V isolation using Docker, use the -isolation parameter to set -isolation=hyperv. Managing Hyper-V-isolated containers with Docker is nearly identical to managing process-isolated containers. The presence of the virtual machine provides hardware-level isolation between each container as well as the container host. With Hyper-V isolation, multiple container instances run concurrently on a host however, each container runs inside of a highly optimized virtual machine and effectively gets its own kernel. This isolation mode offers enhanced security and broader compatibility between host and container versions. sharing synchronization objects (semaphores, mutexes, etc).Windows containers don't currently support: sharing host device visibility into the container.customizing and sharing the network namespace.mapping a port from the host into the container.mapping a named pipe from host into the container.mapping shared files or volumes from host into the container.Windows containers support the following: These operations must be deliberately requested by the user and should be done with careful consideration since it may compromise the security posture of the container. ![]() There are cases when it is useful to pierce the isolation boundary. There are numerous namespaces on Windows that get isolated on a per-container basis: For example, the file system is probably the best-known namespace. A namespace provides access to information, objects, or resources via a name. Windows containers virtualize access to various operating system namespaces. This is approximately the same as how Linux containers run. When running in this mode, containers share the same kernel with the host as well as each other. With process isolation, multiple container instances run concurrently on a given host with isolation provided through namespace, resource control, and other process isolation technologies. ![]() This is the "traditional" isolation mode for containers and is what is described in the Windows containers overview. The difference between the isolation modes is to what degree of isolation is created between the container, the host operating system, and all of the other containers running on that host. They also produce and consume the same container images. Containers running under both isolation modes are created, managed, and function identically. Windows containers offer two distinct modes of runtime isolation: process and Hyper-V isolation. Applies to: Windows Server 2022, Windows Server 2019, Windows Server 2016 ![]()
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