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Merge pull request #114181 from danwinship/minimize-iptables-ensure-rule

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Don't re-run EnsureChain/EnsureRules on partial syncs
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Kubernetes Prow Robot 2022-12-10 07:53:59 -08:00 committed by GitHub
commit 7f1b8a33a8
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1 changed files with 25 additions and 13 deletions
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38
pkg/proxy/iptables/proxier.go
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@ -863,19 +863,31 @@ func (proxier *Proxier) syncProxyRules() {
}
}()
// Create and link the kube chains.
for _, jump := range iptablesJumpChains {
if _, err := proxier.iptables.EnsureChain(jump.table, jump.dstChain); err != nil {
klog.ErrorS(err, "Failed to ensure chain exists", "table", jump.table, "chain", jump.dstChain)
return
}
args := append(jump.extraArgs,
"-m", "comment", "--comment", jump.comment,
"-j", string(jump.dstChain),
)
if _, err := proxier.iptables.EnsureRule(utiliptables.Prepend, jump.table, jump.srcChain, args...); err != nil {
klog.ErrorS(err, "Failed to ensure chain jumps", "table", jump.table, "srcChain", jump.srcChain, "dstChain", jump.dstChain)
return
if !tryPartialSync {
// Ensure that our jump rules (eg from PREROUTING to KUBE-SERVICES) exist.
// We can't do this as part of the iptables-restore because we don't want
// to specify/replace *all* of the rules in PREROUTING, etc.
//
// We need to create these rules when kube-proxy first starts, and we need
// to recreate them if the utiliptables Monitor detects that iptables has
// been flushed. In both of those cases, the code will force a full sync.
// In all other cases, it ought to be safe to assume that the rules
// already exist, so we'll skip this step when doing a partial sync, to
// save us from having to invoke /sbin/iptables 20 times on each sync
// (which will be very slow on hosts with lots of iptables rules).
for _, jump := range iptablesJumpChains {
if _, err := proxier.iptables.EnsureChain(jump.table, jump.dstChain); err != nil {
klog.ErrorS(err, "Failed to ensure chain exists", "table", jump.table, "chain", jump.dstChain)
return
}
args := append(jump.extraArgs,
"-m", "comment", "--comment", jump.comment,
"-j", string(jump.dstChain),
)
if _, err := proxier.iptables.EnsureRule(utiliptables.Prepend, jump.table, jump.srcChain, args...); err != nil {
klog.ErrorS(err, "Failed to ensure chain jumps", "table", jump.table, "srcChain", jump.srcChain, "dstChain", jump.dstChain)
return
}
}
}