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Proxy infrastructure for NodePorts

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A service with a NodePort set will listen on that port, on every node.

This is both handy for some load balancers (AWS ELB) and for people
that want to expose a service without using a load balancer.
This commit is contained in:
Justin Santa Barbara
2015-05-22 17:19:45 -04:00
parent 295d0564a2
commit 1ad4549f5f
4 changed files with 231 additions and 15 deletions
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13
pkg/util/iptables/iptables.go
View File

@@ -28,6 +28,13 @@ import (
"github.com/golang/glog"
)
type RulePosition string
const (
Prepend RulePosition = "-I"
Append RulePosition = "-A"
)
// An injectable interface for running iptables commands. Implementations must be goroutine-safe.
type Interface interface {
// EnsureChain checks if the specified chain exists and, if not, creates it. If the chain existed, return true.
@@ -37,7 +44,7 @@ type Interface interface {
// DeleteChain deletes the specified chain. If the chain did not exist, return error.
DeleteChain(table Table, chain Chain) error
// EnsureRule checks if the specified rule is present and, if not, creates it. If the rule existed, return true.
EnsureRule(table Table, chain Chain, args ...string) (bool, error)
EnsureRule(position RulePosition, table Table, chain Chain, args ...string) (bool, error)
// DeleteRule checks if the specified rule is present and, if so, deletes it.
DeleteRule(table Table, chain Chain, args ...string) error
// IsIpv6 returns true if this is managing ipv6 tables
@@ -126,7 +133,7 @@ func (runner *runner) DeleteChain(table Table, chain Chain) error {
}
// EnsureRule is part of Interface.
func (runner *runner) EnsureRule(table Table, chain Chain, args ...string) (bool, error) {
func (runner *runner) EnsureRule(position RulePosition, table Table, chain Chain, args ...string) (bool, error) {
fullArgs := makeFullArgs(table, chain, args...)
runner.mu.Lock()
@@ -139,7 +146,7 @@ func (runner *runner) EnsureRule(table Table, chain Chain, args ...string) (bool
if exists {
return true, nil
}
out, err := runner.run(opAppendRule, fullArgs)
out, err := runner.run(operation(position), fullArgs)
if err != nil {
return false, fmt.Errorf("error appending rule: %v: %s", err, out)
}