release: reduce nf_conntrack_tcp_timeout_syn_sent to 20s#907
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Mohijeet wants to merge 1 commit intobottlerocket-os:developfrom
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release: reduce nf_conntrack_tcp_timeout_syn_sent to 20s#907Mohijeet wants to merge 1 commit intobottlerocket-os:developfrom
Mohijeet wants to merge 1 commit intobottlerocket-os:developfrom
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more about issue : aws/amazon-vpc-cni-k8s#3634 |
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In clusters using VPC CNI, pod IPs can be reassigned within the default 30s cooldown after a pod crash. Stale SYN_SENT conntrack entries (120s default) outlast that window, allowing client retries with the same src IP:port to hit a different pod/service via the stale entry even after kube-proxy has updated routing rules.
Setting
nf_conntrack_tcp_timeout_syn_sent=20ensures entries expire before the minimum IP reuse window. Added alongside existing conntrack tuning inrelease-sysctl.conf.