Set oom_score_adj for kubelet and kube-proxy to a low value to help them survive system memory pressure.

pkg/util/util.go

@@ -19,8 +19,10 @@ package util
 import (
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"regexp"
 	"runtime"
+	"strconv"
 	"time"
 
 	"github.com/golang/glog"
@@ -134,3 +136,16 @@ func CompileRegexps(regexpStrings []string) ([]*regexp.Regexp, error) {
 	}
 	return regexps, nil
 }
+
+// Writes 'value' to /proc/self/oom_score_adj.
+func ApplyOomScoreAdj(value int) error {
+	if value < -1000 || value > 1000 {
+		return fmt.Errorf("invalid value(%d) specified for oom_score_adj. Values must be within the range [-1000, 1000]")
+	}
+
+	if err := ioutil.WriteFile("/proc/self/oom_score_adj", []byte(strconv.Itoa(value)), 0700); err != nil {
+		fmt.Errorf("failed to set oom_score_adj to %s - %q", value, err)
+	}
+
+	return nil
+}