[alb-controller] Make default_ingress_ip_address_type default to ipv4
#1070
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what
default_ingress_ip_address_type
default toipv4
why
When
dualstack
is configured, the Ingress will fail if the VPC does not have an IPv6 CIDR block, which is still a common case. Whenipv4
is configured, the Ingress will work with only an IPv4 CIDR block, and simply will not use IPv6 if it exists. This makesipv4
themore conservative default.