[Release-1.27] - ServiceLB return ingress address list in alphabetical order, instead of sorted by address family

[brandond]

Backport fix for ServiceLB return ingress address list in alphabetical order, instead of sorted by address family

• ServiceLB return ingress address list in alphabetical order, instead of sorted by address family #8704

[mdrahman-suse]

Validated on release-1.27 branch with commit e3ea0ae

Environment Details

Infrastructure

• Cloud
• Hosted

Node(s) CPU architecture, OS, and Version:

Linux 5.19.0-1025-aws #26~22.04.1-Ubuntu SMP Mon Apr 24 01:58:15 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
PRETTY_NAME="Ubuntu 22.04.2 LTS"
VERSION_ID="22.04"

Cluster Configuration:

1 server

Config.yaml:

write-kubeconfig-mode: "0644"
tls-san:
  - fake.fqdn.value
cluster-init: true
node-name: server1
cluster-cidr: 2001:cafe:42:0::/56,10.42.0.0/16
service-cidr: 2001:cafe:43:0::/112,10.43.0.0/16
token: <token>
node-ip: <IPv6>,<PRIVATE IPv4>

Testing Steps

1. Copy config.yaml

$ sudo mkdir -p /etc/rancher/k3s && sudo cp config.yaml /etc/rancher/k3s

2. Install k3s
3. Check status.loadBalancer.ingress IPs sorting matches spec.ipFamilies using command:
   • kubectl get svc traefik -n kube-system -o yaml

Replication Results:

• k3s version used for replication:

k3s version v1.27.7+k3s2 (575bce76)
go version go1.20.10

$ kubectl get svc traefik -n kube-system -o yaml
apiVersion: v1
kind: Service
metadata:
  annotations:
    meta.helm.sh/release-name: traefik
    meta.helm.sh/release-namespace: kube-system
...
spec:
  allocateLoadBalancerNodePorts: true
  clusterIP: 2001:cafe:43::3c9f
  clusterIPs:
  - 2001:cafe:43::3c9f
  - 10.43.223.142
  externalTrafficPolicy: Cluster
  internalTrafficPolicy: Cluster
  ipFamilies:
  - IPv6
  - IPv4
  ipFamilyPolicy: PreferDualStack
...
status:
  loadBalancer:
    ingress:
    - ip: <PRIVATE IPv4>
    - ip: <IPv6>

Validation Results:

• k3s version used for validation:

k3s version v1.27.7+k3s-e3ea0ae9 (e3ea0ae9)
go version go1.20.10

$ kubectl get svc traefik -n kube-system -o yaml
apiVersion: v1
kind: Service
metadata:
  annotations:
    meta.helm.sh/release-name: traefik
    meta.helm.sh/release-namespace: kube-system
...
spec:
  allocateLoadBalancerNodePorts: true
  clusterIP: 2001:cafe:43::9f46
  clusterIPs:
  - 2001:cafe:43::9f46
  - 10.43.56.68
  externalTrafficPolicy: Cluster
  internalTrafficPolicy: Cluster
  ipFamilies:
  - IPv6
  - IPv4
  ipFamilyPolicy: PreferDualStack
...
status:
  loadBalancer:
    ingress:
    - ip: <IPv6>
    - ip: <PRIVATE IPv4>