kubernetes-1.21: update ipv6 address comparison patch

[etungsten]

Issue number:
Resolves #1930

Description of changes:

Author: Erikson Tung <[email protected]>
Date:   Fri Jan 28 17:05:19 2022 -0800

    kubernetes-1.21: update ipv6 address comparison patch

Testing done:
Built aws-k8s-1.21 variant successfully.

Launched several nodes and got a few with internal IPv6 addresses that have 0 for some address segments and they all register to the cluster fine:

$ kubectl --kubeconfig ipv6-test-config get nodes -o jsonpath='{range .items[*]}{.metadata.name} {.status.addresses[?(@.type=="InternalIP")].address}{"\n"}'
ip-192-168-18-172.us-west-2.compute.internal 2600:1f13:73a:fc00:0:0:0:ea26
ip-192-168-22-4.us-west-2.compute.internal 2600:1f13:73a:fc00:0:0:0:ea2c
ip-192-168-31-46.us-west-2.compute.internal 2600:1f13:73a:fc00:0:0:0:ea2b
ip-192-168-35-227.us-west-2.compute.internal 2600:1f13:73a:fc01:0:0:0:7768
ip-192-168-48-155.us-west-2.compute.internal 2600:1f13:73a:fc01:0:0:0:7764
ip-192-168-57-50.us-west-2.compute.internal 2600:1f13:73a:fc01:0:0:0:776b
ip-192-168-64-9.us-west-2.compute.internal 2600:1f13:73a:fc02:0:0:0:c166
ip-192-168-7-203.us-west-2.compute.internal 2600:1f13:73a:fc00:0:0:0:ea28
ip-192-168-72-90.us-west-2.compute.internal 2600:1f13:73a:fc02:0:0:0:c165
ip-192-168-91-5.us-west-2.compute.internal 2600:1f13:73a:fc02:0:0:0:c16a

I can kubectl exec and kubectl logs from any pod running on these nodes:

$ kubectl --kubeconfig ipv6-test-config get pods -A --field-selector spec.nodeName=ip-192-168-7-203.us-west-2.compute.internal
NAMESPACE     NAME               READY   STATUS    RESTARTS   AGE
kube-system   aws-node-2nzc8     1/1     Running   0          17m
kube-system   kube-proxy-4hgc4   1/1     Running   0          17m

$ kubectl --kubeconfig ipv6-test-config logs aws-node-2nzc8 -n kube-system
{"level":"info","ts":"2022-01-31T15:42:58.223Z","caller":"entrypoint.sh","msg":"Validating env variables ..."}
{"level":"info","ts":"2022-01-31T15:42:58.224Z","caller":"entrypoint.sh","msg":"Install CNI binaries.."}
{"level":"info","ts":"2022-01-31T15:42:58.241Z","caller":"entrypoint.sh","msg":"Starting IPAM daemon in the background ... "}
{"level":"info","ts":"2022-01-31T15:42:58.243Z","caller":"entrypoint.sh","msg":"Checking for IPAM connectivity ... "}
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    13  100    13    0     0  13000      0 --:--:-- --:--:-- --:--:-- 13000
{"level":"info","ts":"2022-01-31T15:43:02.268Z","caller":"entrypoint.sh","msg":"Copying config file ... "}
mv: setting attribute 'security.selinux' for 'security.selinux': Permission denied
{"level":"info","ts":"2022-01-31T15:43:02.275Z","caller":"entrypoint.sh","msg":"Successfully copied CNI plugin binary and config file."}
{"level":"info","ts":"2022-01-31T15:43:02.275Z","caller":"entrypoint.sh","msg":"Foregrounding IPAM daemon ..."}


$ kubectl --kubeconfig ipv6-test-config exec aws-node-2nzc8 -n kube-system -- ls
Defaulted container "aws-node" out of: aws-node, aws-vpc-cni-init (init)
10-aws.conflist
aws-cni
aws-cni-support.sh
aws-k8s-agent
aws-k8s-agent.log
bandwidth
egress-v4-cni
entrypoint.sh
grpc-health-probe
host-local
loopback
portmap

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.

[webern]

Looks good pending testing.

[zmrow]

🫕