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Always masquerade node-originating traffic with a service VIP source ip

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This commit is contained in:
Rene Treffer 2018-04-29 13:54:19 +02:00
parent 481b2dc7cf
commit f66d4e183f
1 changed files with 11 additions and 3 deletions
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14
pkg/proxy/ipvs/proxier.go
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@ -1218,17 +1218,25 @@ func (proxier *Proxier) writeIptablesRules() {
"-A", string(kubeServicesChain),
"-m", "comment", "--comment", proxier.ipsetList[kubeClusterIPSet].getComment(),
"-m", "set", "--match-set", kubeClusterIPSet,
"dst,dst",
)
if proxier.masqueradeAll {
writeLine(proxier.natRules, append(args, "-j", string(KubeMarkMasqChain))...)
writeLine(proxier.natRules, append(args, "dst,dst", "-j", string(KubeMarkMasqChain))...)
} else if len(proxier.clusterCIDR) > 0 {
// This masquerades off-cluster traffic to a service VIP. The idea
// is that you can establish a static route for your Service range,
// routing to any node, and that node will bridge into the Service
// for you. Since that might bounce off-node, we masquerade here.
// If/when we support "Local" policy for VIPs, we should update this.
writeLine(proxier.natRules, append(args, "! -s", proxier.clusterCIDR, "-j", string(KubeMarkMasqChain))...)
writeLine(proxier.natRules, append(args, "dst,dst", "! -s", proxier.clusterCIDR, "-j", string(KubeMarkMasqChain))...)
} else {
// Masquerade all OUTPUT traffic coming from a service ip.
// The kube dummy interface has all service VIPs assigned which
// results in the service VIP being picked as the source IP to reach
// a VIP. This leads to a connection from VIP:<random port> to
// VIP:<service port>.
// Always masquerading OUTPUT (node-originating) traffic with a VIP
// source ip and service port destination fixes the outgoing connections.
writeLine(proxier.natRules, append(args, "src,dst", "-j", string(KubeMarkMasqChain))...)
}
}