github/kubernetes
1
0
Fork 0
mirror of https://github.com/k3s-io/kubernetes.git synced 2025-07-22 11:21:47 +00:00
Code Issues Projects Releases Wiki Activity

ipvs: only attempt setting of sysctlconnreuse on supported kernels

Browse Source 
This builds on previous work but only sets the sysctlConnReuse value
if the kernel is known to be above 4.19. To avoid calling GetKernelVersion
twice, I store the value from the CanUseIPVS method and then check the version
constraint at time of expected sysctl call.

Signed-off-by: Christopher M. Luciano <cmluciano@us.ibm.com>
This commit is contained in:
Christopher M. Luciano 2020-02-25 14:47:53 -05:00
parent 381a372455
commit d22e18ad4f
No known key found for this signature in database
GPG Key ID: 5148DBB31F2843F1
2 changed files with 24 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
cmd/kube-proxy/app/server_others.go
View File

@ -276,6 +276,7 @@ func newProxyServer(
healthzServer,
config.IPVS.Scheduler,
config.NodePortAddresses,
kernelHandler,
)
} else {
var localDetector proxyutiliptables.LocalTrafficDetector
@ -306,6 +307,7 @@ func newProxyServer(
healthzServer,
config.IPVS.Scheduler,
config.NodePortAddresses,
kernelHandler,
)
}
if err != nil {

28
pkg/proxy/ipvs/proxier.go
View File

@ -88,6 +88,8 @@ const (
// DefaultDummyDevice is the default dummy interface which ipvs service address will bind to it.
DefaultDummyDevice = "kube-ipvs0"
connReuseMinSupportedKernelVersion = "4.1"
)
// iptablesJumpChain is tables of iptables chains that ipvs proxier used to install iptables or cleanup iptables.
@ -341,6 +343,7 @@ func NewProxier(ipt utiliptables.Interface,
healthzServer healthcheck.ProxierHealthUpdater,
scheduler string,
nodePortAddresses []string,
kernelHandler KernelHandler,
) (*Proxier, error) {
// Set the route_localnet sysctl we need for
if val, _ := sysctl.GetSysctl(sysctlRouteLocalnet); val != 1 {
@ -363,10 +366,22 @@ func NewProxier(ipt utiliptables.Interface,
}
}
// Set the connection reuse mode
if val, _ := sysctl.GetSysctl(sysctlConnReuse); val != 0 {
if err := sysctl.SetSysctl(sysctlConnReuse, 0); err != nil {
return nil, fmt.Errorf("can't set sysctl %s: %v", sysctlConnReuse, err)
kernelVersionStr, err := kernelHandler.GetKernelVersion()
if err != nil {
return nil, fmt.Errorf("error determining kernel version to find required kernel modules for ipvs support: %v", err)
}
kernelVersion, err := version.ParseGeneric(kernelVersionStr)
if err != nil {
return nil, fmt.Errorf("error parsing kernel version %q: %v", kernelVersionStr, err)
}
if kernelVersion.LessThan(version.MustParseGeneric(connReuseMinSupportedKernelVersion)) {
klog.Errorf("can't set sysctl %s, kernel version must be at least %s", sysctlConnReuse, connReuseMinSupportedKernelVersion)
} else {
// Set the connection reuse mode
if val, _ := sysctl.GetSysctl(sysctlConnReuse); val != 0 {
if err := sysctl.SetSysctl(sysctlConnReuse, 0); err != nil {
return nil, fmt.Errorf("can't set sysctl %s: %v", sysctlConnReuse, err)
}
}
}
@ -503,6 +518,7 @@ func NewDualStackProxier(
healthzServer healthcheck.ProxierHealthUpdater,
scheduler string,
nodePortAddresses []string,
kernelHandler KernelHandler,
) (proxy.Provider, error) {
safeIpset := newSafeIpset(ipset)
@ -512,7 +528,7 @@ func NewDualStackProxier(
exec, syncPeriod, minSyncPeriod, filterCIDRs(false, excludeCIDRs), strictARP,
tcpTimeout, tcpFinTimeout, udpTimeout, masqueradeAll, masqueradeBit,
localDetectors[0], hostname, nodeIP[0],
recorder, healthzServer, scheduler, nodePortAddresses)
recorder, healthzServer, scheduler, nodePortAddresses, kernelHandler)
if err != nil {
return nil, fmt.Errorf("unable to create ipv4 proxier: %v", err)
}
@ -521,7 +537,7 @@ func NewDualStackProxier(
exec, syncPeriod, minSyncPeriod, filterCIDRs(true, excludeCIDRs), strictARP,
tcpTimeout, tcpFinTimeout, udpTimeout, masqueradeAll, masqueradeBit,
localDetectors[1], hostname, nodeIP[1],
nil, nil, scheduler, nodePortAddresses)
nil, nil, scheduler, nodePortAddresses, kernelHandler)
if err != nil {
return nil, fmt.Errorf("unable to create ipv6 proxier: %v", err)
}