Example #1
0
// 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
	}

	// flush and delete chains.
	chains := []iptables.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(iptables.TableNAT, c); err != nil {
			glog.Errorf("Error flushing userspace chain: %v", err)
			encounteredError = true
		} else {
			if err = ipt.DeleteChain(iptables.TableNAT, c); err != nil {
				glog.Errorf("Error deleting userspace chain: %v", err)
				encounteredError = true
			}
		}
	}
	return encounteredError
}
Example #2
0
// 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 len(el) != 0 {
		glog.Errorf("Some errors flushing old iptables portals: %v", el)
	}
	return errors.NewAggregate(el)
}