76 lines
1.9 KiB
Go
76 lines
1.9 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 main
|
|
|
|
import (
|
|
"io/ioutil"
|
|
"os"
|
|
"os/exec"
|
|
"syscall"
|
|
|
|
"k8s.io/kubernetes/pkg/util/sysctl"
|
|
|
|
"github.com/golang/glog"
|
|
)
|
|
|
|
// sysctlSomaxconn returns the value of net.core.somaxconn, i.e.
|
|
// maximum number of connections that can be queued for acceptance
|
|
// http://nginx.org/en/docs/http/ngx_http_core_module.html#listen
|
|
func sysctlSomaxconn() int {
|
|
maxConns, err := sysctl.New().GetSysctl("net/core/somaxconn")
|
|
if err != nil || maxConns < 512 {
|
|
glog.V(3).Infof("system net.core.somaxconn=%v (using system default)", maxConns)
|
|
return 511
|
|
}
|
|
|
|
return maxConns
|
|
}
|
|
|
|
// sysctlFSFileMax returns the value of fs.file-max, i.e.
|
|
// maximum number of open file descriptors
|
|
func sysctlFSFileMax() int {
|
|
var rLimit syscall.Rlimit
|
|
err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
|
|
if err != nil {
|
|
glog.Errorf("unexpected error reading system maximum number of open file descriptors (RLIMIT_NOFILE): %v", err)
|
|
// returning 0 means don't render the value
|
|
return 0
|
|
}
|
|
return int(rLimit.Max)
|
|
}
|
|
|
|
func diff(b1, b2 []byte) ([]byte, error) {
|
|
f1, err := ioutil.TempFile("", "a")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer f1.Close()
|
|
defer os.Remove(f1.Name())
|
|
|
|
f2, err := ioutil.TempFile("", "b")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer f2.Close()
|
|
defer os.Remove(f2.Name())
|
|
|
|
f1.Write(b1)
|
|
f2.Write(b2)
|
|
|
|
out, _ := exec.Command("diff", "-u", f1.Name(), f2.Name()).CombinedOutput()
|
|
return out, nil
|
|
}
|