WARNING: Overriding the default dynamic port range can have consequences on other processes/services on the host that rely on available TCP ports from the non-ephemeral range, so this range should be selected carefully. As a workaround, users can also increase the default Windows configuration of ephemeral ports available using a command such as netsh int ipv4 set dynamicportrange TCP.DSR mode is fully implemented and available on newer Windows Server Insider build 18945 (or higher) only. For a permanent solution, kube-proxy load balancing should be set to DSR mode.To resolve this issue, a few steps can be taken: A heuristical summary of how many 64-block port reservations are approximately available will also be generated in reservedports.txt. A success number less than 10 indicates the ephemeral pool is running out of free space. The script reserves 10 ranges of 64 TCP ephemeral ports (to emulate HNS behavior), counts reservation successes & failures, then releases the allocated port ranges. The CollectLogs.ps1 will also mimic HNS allocation logic to test port pool allocation availability in the ephemeral TCP port range, and report success/failure in reservedports.txt. Users can identify this issue by running CollectLogs.ps1 script and consulting the *portrange.txt files. This issue may manifest itself through errors in kube-proxy such as: Policy creation failed: hcnCreateLoadBalancer failed in Win32: The specified port already exists. This is due to the high number of ports reserved on each node for every (non-DSR) load balancer. dynamic port range, which by default covers ports 49152 through 65535). In the (default) kube-proxy configuration, nodes in clusters containing many (usually 100+) load balancers may run out of available ephemeral TCP ports (a.k.a. On Windows, kube-proxy creates a HNS load balancer for every Kubernetes service in the cluster. Common networking errors Load balancers are plumbed inconsistently across the cluster nodes You can also always use alternative service managers like nssm.exe to always run these processes (flanneld, kubelet & kube-proxy) in the background for you. Starting with Kubernetes version 1.11, kubelet & kube-proxy can be run as native Windows Services. Can I configure to run all of this in the background? In addition to this, your Windows node should be listed as “Ready” in your Kubernetes cluster. You should see kubelet, kube-proxy, and (if you chose Flannel as your networking solution) flanneld host-agent processes running on your node. General questions How do I know Kubernetes on Windows completed successfully? This page is subdivided into the following categories: Suggest an FAQ item by raising a PR to our documentation repository.
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