[Release 1.22] ipv6 only support

[rbrtbnfgl]

Backport for IPv6 only support #5238 #5215 #4450

[VestigeJ]

Validated with COMMIT=b28796a5ce9d6fb1b35e41198c91516b4cf51ab2

$ k3s -v

k3s version v1.23.4+k3s-b28796a5 (b28796a5)
go version go1.17.5

$ show.configs

cat: /etc/rancher/rke2/config.yaml: No such file or directory
write-kubeconfig-mode: "644"
debug: true
token: "secrettrouble"
disable-network-policy: true
cluster-cidr: 2022:aced:42:0::/56
service-cidr: 2022:aced:42:1::/112
node-ip: 2600:1f1c:ab4:ee48:d5e:cafe:c96c:aced
node-external-ip: 2600:1f1c:ab4:ee48:d5e:cafe:c96c:aced

$ kga

NAMESPACE     NAME                                          READY   STATUS    RESTARTS   AGE     IP                NODE               NOMINATED NODE   READINESS GATES
kube-system   pod/local-path-provisioner-6c79684f77-bw6p4   1/1     Running   0          2m17s   2022:aced:42::2   ip-192-168-7-153   <none>           <none>
kube-system   pod/coredns-5789895cd-xvdqr                   1/1     Running   0          2m17s   2022:aced:42::3   ip-192-168-7-153   <none>           <none>
kube-system   pod/helm-install-traefik-crd-fjqtc            1/1     Running   0          2m17s   2022:aced:42::4   ip-192-168-7-153   <none>           <none>
kube-system   pod/helm-install-traefik-fjfq7                1/1     Running   0          2m17s   2022:aced:42::5   ip-192-168-7-153   <none>           <none>
kube-system   pod/metrics-server-7cd5fcb6b7-dxq4z           1/1     Running   0          2m17s   2022:aced:42::6   ip-192-168-7-153   <none>           <none>

NAMESPACE     NAME                     TYPE        CLUSTER-IP             EXTERNAL-IP   PORT(S)                  AGE     SELECTOR
default       service/kubernetes       ClusterIP   2022:aced:42:1::1      <none>        443/TCP                  2m44s   <none>
kube-system   service/kube-dns         ClusterIP   2022:aced:42:1::a      <none>        53/UDP,53/TCP,9153/TCP   2m40s   k8s-app=kube-dns
kube-system   service/metrics-server   ClusterIP   2022:aced:42:1::2f60   <none>        443/TCP                  2m39s   k8s-app=metrics-server

$ sudo cat agent/kubeproxy.kubeconfig

apiVersion: v1
clusters:
- cluster:
    server: https://[::1]:6443
    certificate-authority: /var/lib/rancher/k3s/agent/server-ca.crt
  name: local

[manuelbuil]

kube-system   pod/helm-install-traefik-crd-fjqtc            1/1     Running   0          2m17s   2022:aced:42::4   ip-192-168-7-153   <none>           <none>
kube-system   pod/helm-install-traefik-fjfq7                1/1     Running   0          2m17s   2022:aced:42::5   ip-192-168-7-153   <none>           <none>

will never Complete. A PR is needed for this

[VestigeJ]

Validated using COMMIT=

$ k3s -v

k3s version v1.22.8+k3s-d73772d6 (d73772d6)
go version go1.16.10

$ show.configs

k3s config: 
iwrite-kubeconfig-mode: 644
debug: true
token: "greymayonnaise"
disable-network-policy: true
cluster-cidr: 2022:aced:42:0::/56
service-cidr: 2022:aced:42:1::/112
node-ip: 2600:1f1c:ab4:ee48:660d:5a81:90fc:1698
node-external-ip: 2600:1f1c:ab4:ee48:660d:5a81:90fc:1698

$ kga

NAMESPACE     NAME                                          READY   STATUS      RESTARTS   AGE     IP                NODE               NOMINATED NODE   READINESS GATES
kube-system   pod/coredns-7796b77cd4-qdzqh                  1/1     Running     0          9m52s   2022:aced:42::2   ip-192-168-17-72   <none>           <none>
kube-system   pod/local-path-provisioner-84bb864455-x8n84   1/1     Running     0          9m52s   2022:aced:42::6   ip-192-168-17-72   <none>           <none>
kube-system   pod/helm-install-traefik-crd--1-t69ps         0/1     Completed   0          9m52s   2022:aced:42::3   ip-192-168-17-72   <none>           <none>
kube-system   pod/helm-install-traefik--1-8x59f             0/1     Completed   1          9m52s   2022:aced:42::5   ip-192-168-17-72   <none>           <none>
kube-system   pod/svclb-traefik-s98s9                       2/2     Running     0          9m21s   2022:aced:42::7   ip-192-168-17-72   <none>           <none>
kube-system   pod/metrics-server-ff9dbcb6c-rnvv7            1/1     Running     0          9m52s   2022:aced:42::4   ip-192-168-17-72   <none>           <none>
kube-system   pod/traefik-56c4b88c4b-p8qj2                  1/1     Running     0          9m21s   2022:aced:42::8   ip-192-168-17-72   <none>           <none>

NAMESPACE     NAME                     TYPE           CLUSTER-IP             EXTERNAL-IP                              PORT(S)                      AGE     SELECTOR
default       service/kubernetes       ClusterIP      2022:aced:42:1::1      <none>                                   443/TCP                      10m     <none>
kube-system   service/kube-dns         ClusterIP      2022:aced:42:1::a      <none>                                   53/UDP,53/TCP,9153/TCP       10m     k8s-app=kube-dns
kube-system   service/metrics-server   ClusterIP      2022:aced:42:1::5a19   <none>                                   443/TCP                      10m     k8s-app=metrics-server
kube-system   service/traefik          LoadBalancer   2022:aced:42:1::8c85   2600:1f1c:ab4:ee48:660d:5a81:90fc:1698   80:30250/TCP,443:32452/TCP   9m21s   app.kubernetes.io/instance=traefik,app.kubernetes.io/name=traefik

NAMESPACE     NAME                           DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR   AGE     CONTAINERS               IMAGES                                                SELECTOR
kube-system   daemonset.apps/svclb-traefik   1         1         1       1            1           <none>          9m21s   lb-port-80,lb-port-443   rancher/klipper-lb:v0.3.4,rancher/klipper-lb:v0.3.4   app=svclb-traefik

NAMESPACE     NAME                                     READY   UP-TO-DATE   AVAILABLE   AGE     CONTAINERS               IMAGES                                   SELECTOR
kube-system   deployment.apps/coredns                  1/1     1            1           10m     coredns                  rancher/mirrored-coredns-coredns:1.9.1   k8s-app=kube-dns
kube-system   deployment.apps/local-path-provisioner   1/1     1            1           10m     local-path-provisioner   rancher/local-path-provisioner:v0.0.21   app=local-path-provisioner
kube-system   deployment.apps/metrics-server           1/1     1            1           10m     metrics-server           rancher/mirrored-metrics-server:v0.5.2   k8s-app=metrics-server
kube-system   deployment.apps/traefik                  1/1     1            1           9m21s   traefik                  rancher/mirrored-library-traefik:2.6.1   app.kubernetes.io/instance=traefik,app.kubernetes.io/name=traefik

NAMESPACE     NAME                                                DESIRED   CURRENT   READY   AGE     CONTAINERS               IMAGES                                   SELECTOR
kube-system   replicaset.apps/coredns-7796b77cd4                  1         1         1       9m52s   coredns                  rancher/mirrored-coredns-coredns:1.9.1   k8s-app=kube-dns,pod-template-hash=7796b77cd4
kube-system   replicaset.apps/local-path-provisioner-84bb864455   1         1         1       9m52s   local-path-provisioner   rancher/local-path-provisioner:v0.0.21   app=local-path-provisioner,pod-template-hash=84bb864455
kube-system   replicaset.apps/metrics-server-ff9dbcb6c            1         1         1       9m52s   metrics-server           rancher/mirrored-metrics-server:v0.5.2   k8s-app=metrics-server,pod-template-hash=ff9dbcb6c
kube-system   replicaset.apps/traefik-56c4b88c4b                  1         1         1       9m21s   traefik                  rancher/mirrored-library-traefik:2.6.1   app.kubernetes.io/instance=traefik,app.kubernetes.io/name=traefik,pod-template-hash=56c4b88c4b

NAMESPACE     NAME                                 COMPLETIONS   DURATION   AGE   CONTAINERS   IMAGES                                      SELECTOR
kube-system   job.batch/helm-install-traefik-crd   1/1           29s        10m   helm         rancher/klipper-helm:v0.7.1-build20220407   controller-uid=58d28175-d362-43d9-94d4-78b71c917d6c
kube-system   job.batch/helm-install-traefik       1/1           32s        10m   helm         rancher/klipper-helm:v0.7.1-build20220407   controller-uid=c08d16d9-90ca-4f6a-850c-9522b6f2b8ce

$ sudo cat /var/lib/rancher/k3s/agent/kubeproxy.kubeconfig

apiVersion: v1
clusters:
- cluster:
    server: https://[::1]:6443
    certificate-authority: /var/lib/rancher/k3s/agent/server-ca.crt
  name: local
contexts:
- context:
    cluster: local
    namespace: default
    user: user
  name: Default
current-context: Default
kind: Config
preferences: {}
users:
- name: user
  user:
    client-certificate: /var/lib/rancher/k3s/agent/client-kube-proxy.crt
    client-key: /var/lib/rancher/k3s/agent/client-kube-proxy.key

[ShylajaDevadiga]

Reopening as etcd-backend fix needs to be backported #5420

Apr 26 05:55:33 i-06e25a0f1eea08ecd k3s[15502]: {"level":"warn","ts":"2022-04-26T05:55:33.419Z","logger":"etcd-client","caller":"v3/retry_interceptor.go:62","msg":"retrying of unary invoker failed","target":"etcd-endpoints://0xc000816000/127.0.0.1:2379","attempt":0,"error":"rpc error: code = DeadlineExceeded desc = latest balancer error: last connection error: connection error: desc = \"transport: Error while dialing dial tcp 127.0.0.1:2379: connect: connection refused\""}

[ShylajaDevadiga]

Validated in the scope of testing #5384
Backport issue for reference #5509