mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-11 07:30:24 +00:00
79 lines
2.5 KiB
Go
79 lines
2.5 KiB
Go
/*
|
|
Copyright 2015 The Kubernetes Authors.
|
|
|
|
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"
|
|
VmOvercommitMemory = "vm/overcommit_memory"
|
|
VmPanicOnOOM = "vm/panic_on_oom"
|
|
KernelPanic = "kernel/panic"
|
|
KernelPanicOnOops = "kernel/panic_on_oops"
|
|
RootMaxKeys = "kernel/keys/root_maxkeys"
|
|
RootMaxBytes = "kernel/keys/root_maxbytes"
|
|
|
|
VmOvercommitMemoryAlways = 1 // kernel performs no memory over-commit handling
|
|
VmPanicOnOOMInvokeOOMKiller = 0 // kernel calls the oom_killer function when OOM occurs
|
|
|
|
KernelPanicOnOopsAlways = 1 // kernel panics on kernel oops
|
|
KernelPanicRebootTimeout = 10 // seconds after a panic for the kernel to reboot
|
|
|
|
RootMaxKeysSetting = 1000000 // Needed since docker creates a new key per container
|
|
RootMaxBytesSetting = RootMaxKeysSetting * 25 // allocate 25 bytes per key * number of MaxKeys
|
|
)
|
|
|
|
// An injectable interface for running sysctl commands.
|
|
type Interface interface {
|
|
// GetSysctl returns the value for the specified sysctl setting
|
|
GetSysctl(sysctl string) (int, error)
|
|
// SetSysctl modifies the specified sysctl flag to the new value
|
|
SetSysctl(sysctl string, newVal int) error
|
|
}
|
|
|
|
// New returns a new Interface for accessing sysctl
|
|
func New() Interface {
|
|
return &procSysctl{}
|
|
}
|
|
|
|
// procSysctl implements Interface by reading and writing files under /proc/sys
|
|
type procSysctl struct {
|
|
}
|
|
|
|
// GetSysctl returns the value for the specified sysctl setting
|
|
func (_ *procSysctl) 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 (_ *procSysctl) SetSysctl(sysctl string, newVal int) error {
|
|
return ioutil.WriteFile(path.Join(sysctlBase, sysctl), []byte(strconv.Itoa(newVal)), 0640)
|
|
}
|