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Set the NON_MASQUERADE_CIDR to 0/0 by default in GCE/GKE which disables

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masquerade rules setup by the kubelet.  Add masquerade rules based
on NON_MASQUERADE_CIDR being set to 0/0.
This commit is contained in:
Daniel Nardo 2017-11-06 10:01:55 -08:00
parent a8fc7f691f
commit 8aef128640
2 changed files with 4 additions and 2 deletions
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2
cluster/gce/config-default.sh
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@ -290,6 +290,8 @@ OPENCONTRAIL_PUBLIC_SUBNET="${OPENCONTRAIL_PUBLIC_SUBNET:-10.1.0.0/16}"
# Network Policy plugin specific settings. # Network Policy plugin specific settings.
NETWORK_POLICY_PROVIDER="${NETWORK_POLICY_PROVIDER:-none}" # calico NETWORK_POLICY_PROVIDER="${NETWORK_POLICY_PROVIDER:-none}" # calico
NON_MASQUERADE_CIDR="0.0.0.0/0"
# How should the kubelet configure hairpin mode? # How should the kubelet configure hairpin mode?
HAIRPIN_MODE="${HAIRPIN_MODE:-promiscuous-bridge}" # promiscuous-bridge, hairpin-veth, none HAIRPIN_MODE="${HAIRPIN_MODE:-promiscuous-bridge}" # promiscuous-bridge, hairpin-veth, none
# Optional: if set to true, kube-up will configure the cluster to run e2e tests. # Optional: if set to true, kube-up will configure the cluster to run e2e tests.

4
cluster/gce/gci/configure-helper.sh
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@ -64,8 +64,8 @@ function config-ip-firewall {
# Flush iptables nat table # Flush iptables nat table
iptables -t nat -F || true iptables -t nat -F || true
if [[ "${NETWORK_POLICY_PROVIDER:-}" == "calico" && "${KUBERNETES_MASTER:-}" == false ]]; then echo "Add rules for ip masquerade"
echo "Add rules for ip masquerade" if [[ "${NON_MASQUERADE_CIDR:-}" == "0.0.0.0/0" ]]; then
iptables -t nat -N IP-MASQ iptables -t nat -N IP-MASQ
iptables -t nat -A POSTROUTING -m comment --comment "ip-masq: ensure nat POSTROUTING directs all non-LOCAL destination traffic to our custom IP-MASQ chain" -m addrtype ! --dst-type LOCAL -j IP-MASQ iptables -t nat -A POSTROUTING -m comment --comment "ip-masq: ensure nat POSTROUTING directs all non-LOCAL destination traffic to our custom IP-MASQ chain" -m addrtype ! --dst-type LOCAL -j IP-MASQ
iptables -t nat -A IP-MASQ -d 169.254.0.0/16 -m comment --comment "ip-masq: local traffic is not subject to MASQUERADE" -j RETURN iptables -t nat -A IP-MASQ -d 169.254.0.0/16 -m comment --comment "ip-masq: local traffic is not subject to MASQUERADE" -j RETURN