Kubelet sets kernel overcommit_memory flag

pkg/util/sysctl/sysctl.go

@@ -0,0 +1,44 @@
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package sysctl
+
+import (
+	"io/ioutil"
+	"path"
+	"strconv"
+	"strings"
+)
+
+const sysctlBase = "/proc/sys"
+
+// GetSysctl returns the value for the specified sysctl setting
+func GetSysctl(sysctl string) (int, error) {
+	data, err := ioutil.ReadFile(path.Join(sysctlBase, sysctl))
+	if err != nil {
+		return -1, err
+	}
+	val, err := strconv.Atoi(strings.Trim(string(data), " \n"))
+	if err != nil {
+		return -1, err
+	}
+	return val, nil
+}
+
+// SetSysctl modifies the specified sysctl flag to the new value
+func SetSysctl(sysctl string, newVal int) error {
+	return ioutil.WriteFile(path.Join(sysctlBase, sysctl), []byte(strconv.Itoa(newVal)), 0640)
+}