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DelegatingAuthenticationOptions: allows for setting a timeout for the TokenReview client that is used by for the webhook authenticator

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Previously no timeout was set. Requests without explicit timeout might potentially hang forever and lead to starvation of the application.
When no timeout was specified a default one will be applied.
This commit is contained in:
Lukasz Szaszkiewicz 2020-11-04 11:14:44 +01:00
parent 739768d086
commit 7340c3498a
3 changed files with 14 additions and 0 deletions
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1
cmd/kube-controller-manager/app/options/options_test.go
View File

@ -406,6 +406,7 @@ func TestAddFlags(t *testing.T) {
}).WithLoopback(),
Authentication: &apiserveroptions.DelegatingAuthenticationOptions{
CacheTTL: 10 * time.Second,
ClientTimeout: 10 * time.Second,
WebhookRetryBackoff: apiserveroptions.DefaultAuthWebhookRetryBackoff(),
ClientCert: apiserveroptions.ClientCertAuthenticationOptions{},
RequestHeader: apiserveroptions.RequestHeaderAuthenticationOptions{

11
staging/src/k8s.io/apiserver/pkg/server/options/authentication.go
View File

@ -194,6 +194,10 @@ type DelegatingAuthenticationOptions struct {
// This allows us to configure the sleep time at each iteration and the maximum number of retries allowed
// before we fail the webhook call in order to limit the fan out that ensues when the system is degraded.
WebhookRetryBackoff *wait.Backoff
// ClientTimeout specifies a time limit for requests made by the authorization webhook client.
// The default value is set to 10 seconds.
ClientTimeout time.Duration
}
func NewDelegatingAuthenticationOptions() *DelegatingAuthenticationOptions {
@ -207,6 +211,7 @@ func NewDelegatingAuthenticationOptions() *DelegatingAuthenticationOptions {
ExtraHeaderPrefixes: []string{"x-remote-extra-"},
},
WebhookRetryBackoff: DefaultAuthWebhookRetryBackoff(),
ClientTimeout: 10 * time.Second,
}
}
@ -215,6 +220,11 @@ func (s *DelegatingAuthenticationOptions) WithCustomRetryBackoff(backoff wait.Ba
s.WebhookRetryBackoff = &backoff
}
// WithClientTimeout sets the given timeout for the authentication webhook client.
func (s *DelegatingAuthenticationOptions) WithClientTimeout(timeout time.Duration) {
s.ClientTimeout = timeout
}
func (s *DelegatingAuthenticationOptions) Validate() []error {
allErrors := []error{}
allErrors = append(allErrors, s.RequestHeader.Validate()...)
@ -405,6 +415,7 @@ func (s *DelegatingAuthenticationOptions) getClient() (kubernetes.Interface, err
// set high qps/burst limits since this will effectively limit API server responsiveness
clientConfig.QPS = 200
clientConfig.Burst = 400
clientConfig.Timeout = s.ClientTimeout
return kubernetes.NewForConfig(clientConfig)
}

2
staging/src/k8s.io/cloud-provider/options/options_test.go
View File

@ -104,6 +104,7 @@ func TestDefaultFlags(t *testing.T) {
}).WithLoopback(),
Authentication: &apiserveroptions.DelegatingAuthenticationOptions{
CacheTTL: 10 * time.Second,
ClientTimeout: 10 * time.Second,
WebhookRetryBackoff: apiserveroptions.DefaultAuthWebhookRetryBackoff(),
ClientCert: apiserveroptions.ClientCertAuthenticationOptions{},
RequestHeader: apiserveroptions.RequestHeaderAuthenticationOptions{
@ -239,6 +240,7 @@ func TestAddFlags(t *testing.T) {
}).WithLoopback(),
Authentication: &apiserveroptions.DelegatingAuthenticationOptions{
CacheTTL: 10 * time.Second,
ClientTimeout: 10 * time.Second,
WebhookRetryBackoff: apiserveroptions.DefaultAuthWebhookRetryBackoff(),
ClientCert: apiserveroptions.ClientCertAuthenticationOptions{},
RequestHeader: apiserveroptions.RequestHeaderAuthenticationOptions{