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-rw-r--r--nixos/modules/services/cluster/kubernetes/kubelet.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixos/modules/services/cluster/kubernetes/kubelet.nix b/nixos/modules/services/cluster/kubernetes/kubelet.nix
index c841f4e5f1862..f36edeaf64ceb 100644
--- a/nixos/modules/services/cluster/kubernetes/kubelet.nix
+++ b/nixos/modules/services/cluster/kubernetes/kubelet.nix
@@ -356,7 +356,7 @@ in
       boot.kernelModules = ["br_netfilter" "overlay"];
 
       services.kubernetes.kubelet.hostname =
-        mkDefault config.networking.fqdnOrHostName;
+        mkDefault (lib.toLower config.networking.fqdnOrHostName);
 
       services.kubernetes.pki.certs = with top.lib; {
         kubelet = mkCert {