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add ip_pref CNI options for primary pod ip

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This fixes the TODO of this function and also expands on how the primary pod ip
is selected. This change allows the operator to prefer ipv4, ipv6, or retain the
ordering provided by the return results of the CNI plugins.

This makes it much more flexible for ops to configure containerd and how IPs are
set on the pod.

Signed-off-by: Michael Crosby <michael@thepasture.io>
This commit is contained in:
Michael Crosby
2021-09-09 10:42:07 -04:00
parent a4d64e5e00
commit 1efed43090
4 changed files with 67 additions and 21 deletions
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6
docs/cri/config.md
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@@ -238,6 +238,12 @@ version = 2
# This will be deprecated when kubenet is deprecated.
# See the "CNI Config Template" section for more details.
conf_template = ""
# ip_pref specifies the strategy to use when selecting the main IP address for a pod.
# options include:
# * ipv4, "" - (default) select the first ipv4 address
# * ipv6 - select the first ipv6 address
# * cni - use the order returned by the CNI plugins, returning the first IP address from the results
ip_pref = "ipv4"
# 'plugins."io.containerd.grpc.v1.cri".image_decryption' contains config related
# to handling decryption of encrypted container images.