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Kube-proxy/ipvs; Use go "net" lib to get nodeIPs

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The nodeIPs to be used for nodePorts were collected using
netlink which was unnecessary complex and caused se #93858
This commit is contained in:
Lars Ekman
2021-08-21 08:44:27 +02:00
parent c98b388a84
commit 9f37096c38
9 changed files with 369 additions and 121 deletions
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42
pkg/proxy/ipvs/proxier.go
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@@ -289,33 +289,31 @@ type realIPGetter struct {
nl NetLinkHandle
}
// NodeIPs returns all LOCAL type IP addresses from host which are taken as the Node IPs of NodePort service.
// It will list source IP exists in local route table with `kernel` protocol type, and filter out IPVS proxier
// created dummy device `kube-ipvs0` For example,
// $ ip route show table local type local proto kernel
// 10.0.0.1 dev kube-ipvs0 scope host src 10.0.0.1
// 10.0.0.10 dev kube-ipvs0 scope host src 10.0.0.10
// 10.0.0.252 dev kube-ipvs0 scope host src 10.0.0.252
// 100.106.89.164 dev eth0 scope host src 100.106.89.164
// 127.0.0.0/8 dev lo scope host src 127.0.0.1
// 127.0.0.1 dev lo scope host src 127.0.0.1
// 172.17.0.1 dev docker0 scope host src 172.17.0.1
// 192.168.122.1 dev virbr0 scope host src 192.168.122.1
// Then filter out dev==kube-ipvs0, and cut the unique src IP fields,
// Node IP set: [100.106.89.164, 172.17.0.1, 192.168.122.1]
// Note that loopback addresses are excluded.
// NodeIPs returns all LOCAL type IP addresses from host which are
// taken as the Node IPs of NodePort service. Filtered addresses:
//
// * Loopback addresses
// * Addresses of the "other" family (not handled by this proxier instance)
// * Link-local IPv6 addresses
// * Addresses on the created dummy device `kube-ipvs0`
//
func (r *realIPGetter) NodeIPs() (ips []net.IP, err error) {
// Pass in empty filter device name for list all LOCAL type addresses.
nodeAddress, err := r.nl.GetLocalAddresses("", DefaultDummyDevice)
nodeAddress, err := r.nl.GetAllLocalAddresses()
if err != nil {
return nil, fmt.Errorf("error listing LOCAL type addresses from host, error: %v", err)
}
// We must exclude the addresses on the IPVS dummy interface
bindedAddress, err := r.BindedIPs()
if err != nil {
return nil, err
}
ipset := nodeAddress.Difference(bindedAddress)
// translate ip string to IP
for _, ipStr := range nodeAddress.UnsortedList() {
for _, ipStr := range ipset.UnsortedList() {
a := netutils.ParseIPSloppy(ipStr)
if a.IsLoopback() {
continue
}
ips = append(ips, a)
}
return ips, nil
@@ -323,7 +321,7 @@ func (r *realIPGetter) NodeIPs() (ips []net.IP, err error) {
// BindedIPs returns all addresses that are binded to the IPVS dummy interface kube-ipvs0
func (r *realIPGetter) BindedIPs() (sets.String, error) {
return r.nl.GetLocalAddresses(DefaultDummyDevice, "")
return r.nl.GetLocalAddresses(DefaultDummyDevice)
}
// Proxier implements proxy.Provider