Update kubernetes proxy.nix to use fqdn for default hostname

[happyearthbytes]

Description of changes

• Fix kubernetes proxy default hostname to use fqdn

This fixes the errors:

• Failed to retrieve node info" err="nodes \\"<hostname>\\" not found
• Can't determine this node's IP, assuming loopback

Jul 07 18:20:46 nixos-box kube-proxy[38777]: I0707 18:20:46.553759   38777 server_linux.go:69] "Using iptables proxy"
Jul 07 18:20:47 nixos-box kube-proxy[38777]: E0707 18:20:47.588569   38777 server.go:1051] "Failed to retrieve node info" err="nodes \"nixos-box\" is forbidden: User \"system:kube-proxy\" cannot get resource \"nodes\" in API group \"\" a>
Jul 07 18:20:48 nixos-box kube-proxy[38777]: E0707 18:20:48.615340   38777 server.go:1051] "Failed to retrieve node info" err="nodes \"nixos-box\" not found"
Jul 07 18:20:50 nixos-box kube-proxy[38777]: E0707 18:20:50.880253   38777 server.go:1051] "Failed to retrieve node info" err="nodes \"nixos-box\" not found"
Jul 07 18:20:55 nixos-box kube-proxy[38777]: E0707 18:20:55.396714   38777 server.go:1051] "Failed to retrieve node info" err="nodes \"nixos-box\" not found"
Jul 07 18:21:03 nixos-box kube-proxy[38777]: E0707 18:21:03.691568   38777 server.go:1051] "Failed to retrieve node info" err="nodes \"nixos-box\" not found"
Jul 07 18:21:21 nixos-box kube-proxy[38777]: E0707 18:21:21.946483   38777 server.go:1051] "Failed to retrieve node info" err="nodes \"nixos-box\" not found"
Jul 07 18:21:21 nixos-box kube-proxy[38777]: I0707 18:21:21.946505   38777 server.go:1032] "Can't determine this node's IP, assuming loopback; if this is incorrect, please set the --bind-address flag"
Jul 07 18:21:21 nixos-box kube-proxy[38777]: I0707 18:21:21.951239   38777 conntrack.go:59] "Setting nf_conntrack_max" nfConntrackMax=524288
Jul 07 18:21:21 nixos-box kube-proxy[38777]: I0707 18:21:21.957357   38777 server.go:659] "kube-proxy running in dual-stack mode" primary ipFamily="IPv4"

The correct message is now logged:

• Successfully retrieved node IP(s)

Jul 07 19:00:10 nixos-box kube-proxy[66174]: I0707 19:00:10.805207   66174 server_linux.go:69] "Using iptables proxy"
Jul 07 19:00:11 nixos-box kube-proxy[66174]: I0707 19:00:11.137930   66174 server.go:1062] "Successfully retrieved node IP(s)" IPs=["192.168.1.180"]
Jul 07 19:00:11 nixos-box kube-proxy[66174]: I0707 19:00:11.142006   66174 conntrack.go:59] "Setting nf_conntrack_max" nfConntrackMax=524288

• Note the startup time improvement between "Using iptables proxy" and "Setting nf_conntrack_max" nfConntrackMax=524288

BEFORE:

18:20:46.553759 Using iptables proxy 
...
18:21:21.951239 "Setting nf_conntrack_max" nfConntrackMax=524288

AFTER:

19:00:10.805207 Using iptables proxy
...
19:00:11.142006 "Setting nf_conntrack_max" nfConntrackMax=524288

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

---

Add a 👍 reaction to pull requests you find important.

[srhb]

Does this need a release note?