KIND (or Kubernetes-in-Docker) is one of the Kubernetes SIG. MetalLB as a method for getting an easy load balancer on-premises for. Routing mesh for Windows docker hosts is supported on Windows Server 2019 (and above), but not on Windows Server 2016. Users seeking an alternative load balancing strategy on Windows Server 2016 today can setup an external load balancer (e.g. NGINX) and use Swarm’s publish-port mode to expose container host ports over which to balance traffic.

This topic applies to Docker Enterprise.

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Once you’ve joined multiple manager nodes for high-availability, you canconfigure your own load balancer to balance user requests across allmanager nodes.

This allows users to access UCP using a centralized domain name. Ifa manager node goes down, the load balancer can detect that and stop forwardingrequests to that node, so that the failure goes unnoticed by users.

Load-balancing on UCP

Since Docker UCP uses mutual TLS, make sure you configure your load balancer to:

• Load-balance TCP traffic on ports 443 and 6443.
• Not terminate HTTPS connections.
• Use the /_ping endpoint on each manager node, to check if the nodeis healthy and if it should remain on the load balancing pool or not.

Load balancing UCP and DTR

By default, both UCP and DTR use port 443. If you plan on deploying UCP and DTR,your load balancer needs to distinguish traffic between the two by IP addressor port number.

• If you want to configure your load balancer to listen on port 443:
  • Use one load balancer for UCP, and another for DTR,
  • Use the same load balancer with multiple virtual IPs.
• Configure your load balancer to expose UCP or DTR on a port other than 443.

Additional requirements

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In addition to configuring your load balancer to distinguish between UCP and DTR, configuring a load balancer for DTR has additional requirements.

Configuration examples

Use the following examples to configure your load balancer for UCP.

You can deploy your load balancer using:

Where to go next