Golang Interface.FlushChain方法代码示例

// tearDownUserspaceIptables removes all iptables rules and chains created by the userspace Proxier
func tearDownUserspaceIptables(ipt utiliptables.Interface) {
	// NOTE: Warning, this needs to be kept in sync with the userspace Proxier,
	// we want to ensure we remove all of the iptables rules it creates.
	// Currently they are all in iptablesInit()
	// Delete Rules first, then Flush and Delete Chains
	args := []string{"-m", "comment", "--comment", "handle ClusterIPs; NOTE: this must be before the NodePort rules"}
	if err := ipt.DeleteRule(utiliptables.TableNAT, utiliptables.ChainOutput, append(args, "-j", string(iptablesHostPortalChain))...); err != nil {
		glog.Errorf("Error removing userspace rule: %v", err)
	}
	if err := ipt.DeleteRule(utiliptables.TableNAT, utiliptables.ChainPrerouting, append(args, "-j", string(iptablesContainerPortalChain))...); err != nil {
		glog.Errorf("Error removing userspace rule: %v", err)
	}
	args = []string{"-m", "addrtype", "--dst-type", "LOCAL"}
	args = append(args, "-m", "comment", "--comment", "handle service NodePorts; NOTE: this must be the last rule in the chain")
	if err := ipt.DeleteRule(utiliptables.TableNAT, utiliptables.ChainOutput, append(args, "-j", string(iptablesHostNodePortChain))...); err != nil {
		glog.Errorf("Error removing userspace rule: %v", err)
	}
	if err := ipt.DeleteRule(utiliptables.TableNAT, utiliptables.ChainPrerouting, append(args, "-j", string(iptablesContainerNodePortChain))...); err != nil {
		glog.Errorf("Error removing userspace rule: %v", err)
	}

	// flush and delete chains.
	chains := []utiliptables.Chain{iptablesContainerPortalChain, iptablesHostPortalChain, iptablesHostNodePortChain, iptablesContainerNodePortChain}
	for _, c := range chains {
		// flush chain, then if sucessful delete, delete will fail if flush fails.
		if err := ipt.FlushChain(utiliptables.TableNAT, c); err != nil {
			glog.Errorf("Error flushing userspace chain: %v", err)
		} else {
			if err = ipt.DeleteChain(utiliptables.TableNAT, c); err != nil {
				glog.Errorf("Error flushing userspace chain: %v", err)
			}
		}
	}
}

// CleanupLeftovers removes all iptables rules and chains created by the Proxier
// It returns true if an error was encountered. Errors are logged.
func CleanupLeftovers(ipt utiliptables.Interface) (encounteredError bool) {
	//TODO: actually tear down all rules and chains.
	args := []string{"-m", "comment", "--comment", "kubernetes service portals", "-j", string(iptablesServicesChain)}
	if err := ipt.DeleteRule(utiliptables.TableNAT, utiliptables.ChainOutput, args...); err != nil {
		glog.Errorf("Error removing pure-iptables proxy rule: %v", err)
		encounteredError = true
	}
	if err := ipt.DeleteRule(utiliptables.TableNAT, utiliptables.ChainPrerouting, args...); err != nil {
		glog.Errorf("Error removing pure-iptables proxy rule: %v", err)
		encounteredError = true
	}

	args = []string{"-m", "comment", "--comment", "kubernetes service traffic requiring SNAT", "-m", "mark", "--mark", iptablesMasqueradeMark, "-j", "MASQUERADE"}
	if err := ipt.DeleteRule(utiliptables.TableNAT, utiliptables.ChainPostrouting, args...); err != nil {
		glog.Errorf("Error removing pure-iptables proxy rule: %v", err)
		encounteredError = true
	}

	// flush and delete chains.
	chains := []utiliptables.Chain{iptablesServicesChain, iptablesNodePortsChain}
	for _, c := range chains {
		// flush chain, then if sucessful delete, delete will fail if flush fails.
		if err := ipt.FlushChain(utiliptables.TableNAT, c); err != nil {
			glog.Errorf("Error flushing pure-iptables proxy chain: %v", err)
			encounteredError = true
		} else {
			if err = ipt.DeleteChain(utiliptables.TableNAT, c); err != nil {
				glog.Errorf("Error deleting pure-iptables proxy chain: %v", err)
				encounteredError = true
			}
		}
	}
	return encounteredError
}

// CleanupLeftovers removes all iptables rules and chains created by the Proxier
// It returns true if an error was encountered. Errors are logged.
func CleanupLeftovers(ipt iptables.Interface) (encounteredError bool) {
	// NOTE: Warning, this needs to be kept in sync with the userspace Proxier,
	// we want to ensure we remove all of the iptables rules it creates.
	// Currently they are all in iptablesInit()
	// Delete Rules first, then Flush and Delete Chains
	args := []string{"-m", "comment", "--comment", "handle ClusterIPs; NOTE: this must be before the NodePort rules"}
	if err := ipt.DeleteRule(iptables.TableNAT, iptables.ChainOutput, append(args, "-j", string(iptablesHostPortalChain))...); err != nil {
		glog.Errorf("Error removing userspace rule: %v", err)
		encounteredError = true
	}
	if err := ipt.DeleteRule(iptables.TableNAT, iptables.ChainPrerouting, append(args, "-j", string(iptablesContainerPortalChain))...); err != nil {
		glog.Errorf("Error removing userspace rule: %v", err)
		encounteredError = true
	}
	args = []string{"-m", "addrtype", "--dst-type", "LOCAL"}
	args = append(args, "-m", "comment", "--comment", "handle service NodePorts; NOTE: this must be the last rule in the chain")
	if err := ipt.DeleteRule(iptables.TableNAT, iptables.ChainOutput, append(args, "-j", string(iptablesHostNodePortChain))...); err != nil {
		glog.Errorf("Error removing userspace rule: %v", err)
		encounteredError = true
	}
	if err := ipt.DeleteRule(iptables.TableNAT, iptables.ChainPrerouting, append(args, "-j", string(iptablesContainerNodePortChain))...); err != nil {
		glog.Errorf("Error removing userspace rule: %v", err)
		encounteredError = true
	}
	args = []string{"-m", "comment", "--comment", "Ensure that non-local NodePort traffic can flow"}
	if err := ipt.DeleteRule(iptables.TableFilter, iptables.ChainInput, append(args, "-j", string(iptablesNonLocalNodePortChain))...); err != nil {
		glog.Errorf("Error removing userspace rule: %v", err)
		encounteredError = true
	}

	// flush and delete chains.
	tableChains := map[iptables.Table][]iptables.Chain{
		iptables.TableNAT:    {iptablesContainerPortalChain, iptablesHostPortalChain, iptablesHostNodePortChain, iptablesContainerNodePortChain},
		iptables.TableFilter: {iptablesNonLocalNodePortChain},
	}
	for table, chains := range tableChains {
		for _, c := range chains {
			// flush chain, then if successful delete, delete will fail if flush fails.
			if err := ipt.FlushChain(table, c); err != nil {
				glog.Errorf("Error flushing userspace chain: %v", err)
				encounteredError = true
			} else {
				if err = ipt.DeleteChain(table, c); err != nil {
					glog.Errorf("Error deleting userspace chain: %v", err)
					encounteredError = true
				}
			}
		}
	}
	return encounteredError
}

// Flush all of our custom iptables rules.
func iptablesFlush(ipt iptables.Interface) error {
	el := []error{}
	if err := ipt.FlushChain(iptables.TableNAT, iptablesContainerPortalChain); err != nil {
		el = append(el, err)
	}
	if err := ipt.FlushChain(iptables.TableNAT, iptablesHostPortalChain); err != nil {
		el = append(el, err)
	}
	if err := ipt.FlushChain(iptables.TableNAT, iptablesContainerNodePortChain); err != nil {
		el = append(el, err)
	}
	if err := ipt.FlushChain(iptables.TableNAT, iptablesHostNodePortChain); err != nil {
		el = append(el, err)
	}
	if err := ipt.FlushChain(iptables.TableFilter, iptablesNonLocalNodePortChain); err != nil {
		el = append(el, err)
	}
	if len(el) != 0 {
		glog.Errorf("Some errors flushing old iptables portals: %v", el)
	}
	return utilerrors.NewAggregate(el)
}