Add ENABLE_V4_EGRESS env var to control IPv4 egress in IPv6 clusters #2577
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What type of PR is this?
feature
Which issue does this PR fix:
aws/aws-network-policy-agent#55
What does this PR do / Why do we need it:
This PR adds a new environment variable,
ENABLE_V4_EGRESS
, which controls whether theegress-cni
chained plugin is enabled for IPv6 clusters. The value is enabled by default, preserving the existing IPv6 default. When disabled, an IPv4 interface will not be created in IPv6 pods, blocking those pods from reaching IPv4 endpoints.The primary motivation for this PR is to address aws/aws-network-policy-agent#55, where the concern is network policies in IPv6 clusters not applying to IPv4 traffic.
If an issue # is not available please add repro steps and logs from IPAMD/CNI showing the issue:
N/A
Testing done on this change:
Manually verified that chained plugin is enabled or disabled based on env var.
Automation added to e2e:
N/A
Will this PR introduce any new dependencies?:
No
Will this break upgrades or downgrades. Has updating a running cluster been tested?:
No, Yes
Does this change require updates to the CNI daemonset config files to work?:
No
Does this PR introduce any user-facing change?:
Yes
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.