#Docker network host mode on windows enterprise keygen#
We can include other options, both for the configuration of the service, and the configuration of the containers. publish if any ports are to be published externally replicas to specify the numbers of replicas at any one time name to give the service a friendly name This leads to some confusing documentation.įor version 1709 and beyond, the command to create a service using the overlay network and routing mesh is, for example:ĭocker service create to create a new service Windows Server before version 1709 supports the overlay network for communication between containers, but not the routing mesh for communication between external clients and containers. Connections from one container to another are on a private subnet shared across containers in the swarm, rather than on the subnet shared with the host. Connections from external clients arriving at any host are routed to any replica in the service (a “routing mesh”). This is a general problem with service scaling across hosts. The Docker solution is to use an Overlay network for swarm traffic. But we would still need to manage the addresses in a load balancer whenever a replica is created or removed. This way we can have more than one container listening on the same port. In the case of a docker service, we would need to do this whenever a new replica is created or removed.Īlternatively we can set up a transparent network, where the container has an externally reachable IP address. We would need to discover the dynamic ports and put them into an external load balancer. But then the client does not know what port on the host to connect to. If we do not define the host port (by using -publish 80), then one is created dynamically on the host, and so we can have more than one container listening on the same port. But this limits us to one container only, on that port. A port on the host is translated to a port on the container so, for example, we use -publish 80:80. The default network type in Docker is nat. In the Swarm section, we can see an overview of the cluster:īefore we create a service, we need to decide how external clients will connect to containers, and how containers will connect to each other. This is what we see in the dashboard after creating the swarm: I have described setting it up here: Windows Containers: Portainer GUI. If we want to use a GUI to see what is going on, we can use Portainer. The documentation for setting up and managing the swarm is here: Docker Swarm. We can add or remove nodes later, as workers or managers. To join a host as a worker, run: docker swarm join -token The default is to listen on all addresses on port 2377 (0.0.0.0:2377), so there is no need to specify it. To create the swarm, run: docker swarm init -advertise-addr
This trafffic synchronises the state of a service between hosts. TCP and UDP port 7946 is for the “control plane” communication between hosts (worker to worker).TCP port 2377 is for Docker communication between manager and worker.We need to open ports on the Windows firewall on each host to allow communication between the docker machines: Instead we can create a cluster of Windows hosts using the Azure virtual machine scale set with Windows Server 2016 Datacenter – with Containers. Azure Container Service (ACS) does not currently include Windows hosts, although it is changing so fast that may be out of date any time soon. To set up the Swarm cluster we need more than one machine, obviously.
The Containers feature in Windows Server 2016 by default includes Docker Swarm but not Docker Compose. Just to complete the picture, Docker Compose is the tool that creates an application from a set of services. A service is a collection of containers running with the same configuration, and following a set of rules to define the service. They communicate with each other to implement docker services. It defines machines as managers or workers. It work on Windows Server 2016 hosts, but the built-in routing mesh is not supported until the newest Windows Server version 1709, released in October 2017.ĭocker Swarm is the tool for managing containers across separate docker machines. Docker Swarm enables containers to be managed across different hosts.
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