add kubelet validation for containerLogMaxFiles

Author: kannon92

pkg/kubelet/apis/config/validation/validation.go

@@ -342,6 +342,10 @@ func ValidateKubeletConfiguration(kc *kubeletconfig.KubeletConfiguration, featur
 		allErrors = append(allErrors, fmt.Errorf("invalid configuration: containerLogMonitorInterval must be a positive time duration greater than or equal to 3s"))
 	}
 
+	if kc.ContainerLogMaxFiles <= 1 {
+		allErrors = append(allErrors, fmt.Errorf("invalid configuration: containerLogMaxFiles must be greater than 1"))
+	}
+
 	if kc.PodLogsDir == "" {
 		allErrors = append(allErrors, fmt.Errorf("invalid configuration: podLogsDir was not specified"))
 	}

pkg/kubelet/apis/config/validation/validation_test.go

@@ -79,6 +79,7 @@ var (
 		},
 		ContainerRuntimeEndpoint:    "unix:///run/containerd/containerd.sock",
 		ContainerLogMaxWorkers:      1,
+		ContainerLogMaxFiles:        5,
 		ContainerLogMonitorInterval: metav1.Duration{Duration: 10 * time.Second},
 		SingleProcessOOMKill:        ptr.To(!kubeletutil.IsCgroup2UnifiedMode()),
 		CrashLoopBackOff: kubeletconfig.CrashLoopBackOffConfig{
@@ -700,6 +701,13 @@ func TestValidateKubeletConfiguration(t *testing.T) {
 				return config
 			},
 			errMsg: `invalid configuration: pod logs path "/🧪" mut contains ASCII characters only`,
+		}, {
+			name: "invalid containerLogMaxFiles",
+			configure: func(conf *kubeletconfig.KubeletConfiguration) *kubeletconfig.KubeletConfiguration {
+				conf.ContainerLogMaxFiles = 1
+				return conf
+			},
+			errMsg: "invalid configuration: containerLogMaxFiles must be greater than 1",
 		}, {
 			name: "invalid ContainerRuntimeEndpoint",
 			configure: func(conf *kubeletconfig.KubeletConfiguration) *kubeletconfig.KubeletConfiguration {