func (proxier *Proxier) writeServiceToEndpointRules(natRules proxyutil.LineBuffer, svcPortNameString string, svcInfo proxy.ServicePort, svcChain utiliptables.Chain, endpoints []proxy.Endpoint, args []string) {
	// First write session affinity rules, if applicable.
	if svcInfo.SessionAffinityType() == v1.ServiceAffinityClientIP {
		for _, ep := range endpoints {
			epInfo, ok := ep.(*endpointInfo)
			if !ok {
				continue
			}
			comment := fmt.Sprintf(`"%s -> %s"`, svcPortNameString, epInfo.String())

			args = append(args[:0],
				"-A", string(svcChain),
			)
			args = proxier.appendServiceCommentLocked(args, comment)
			args = append(args,
				"-m", "recent", "--name", string(epInfo.ChainName),
				"--rcheck", "--seconds", strconv.Itoa(svcInfo.StickyMaxAgeSeconds()), "--reap",
				"-j", string(epInfo.ChainName),
			)
			natRules.Write(args)
		}
	}

	// Now write loadbalancing rules.
	numEndpoints := len(endpoints)
	for i, ep := range endpoints {
		epInfo, ok := ep.(*endpointInfo)
		if !ok {
			continue
		}
		comment := fmt.Sprintf(`"%s -> %s"`, svcPortNameString, epInfo.String())

		args = append(args[:0], "-A", string(svcChain))
		args = proxier.appendServiceCommentLocked(args, comment)
		if i < (numEndpoints - 1) {
			// Each rule is a probabilistic match.
			args = append(args,
				"-m", "statistic",
				"--mode", "random",
				"--probability", proxier.probability(numEndpoints-i))
		}
		// The final (or only if n == 1) rule is a guaranteed match.
		natRules.Write(args, "-j", string(epInfo.ChainName))
	}
}

Échauffement