87 lines
2.1 KiB
Go
87 lines
2.1 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"fmt"
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"io/ioutil"
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"net"
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"os"
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"os/exec"
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"syscall"
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"github.com/golang/glog"
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"k8s.io/kubernetes/pkg/util/sysctl"
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)
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// sysctlSomaxconn returns the value of net.core.somaxconn, i.e.
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// maximum number of connections that can be queued for acceptance
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// http://nginx.org/en/docs/http/ngx_http_core_module.html#listen
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func sysctlSomaxconn() int {
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maxConns, err := sysctl.New().GetSysctl("net/core/somaxconn")
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if err != nil || maxConns < 512 {
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glog.V(3).Infof("system net.core.somaxconn=%v (using system default)", maxConns)
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return 511
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}
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return maxConns
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}
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// sysctlFSFileMax returns the value of fs.file-max, i.e.
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// maximum number of open file descriptors
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func sysctlFSFileMax() int {
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var rLimit syscall.Rlimit
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err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
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if err != nil {
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glog.Errorf("unexpected error reading system maximum number of open file descriptors (RLIMIT_NOFILE): %v", err)
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// returning 0 means don't render the value
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return 0
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}
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return int(rLimit.Max)
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}
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func diff(b1, b2 []byte) ([]byte, error) {
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f1, err := ioutil.TempFile("", "a")
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if err != nil {
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return nil, err
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}
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defer f1.Close()
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defer os.Remove(f1.Name())
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f2, err := ioutil.TempFile("", "b")
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if err != nil {
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return nil, err
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}
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defer f2.Close()
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defer os.Remove(f2.Name())
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f1.Write(b1)
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f2.Write(b2)
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out, _ := exec.Command("diff", "-u", f1.Name(), f2.Name()).CombinedOutput()
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return out, nil
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}
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func isPortAvailable(p int) bool {
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ln, err := net.Listen("tcp", fmt.Sprintf(":%v", p))
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if err != nil {
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return false
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}
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ln.Close()
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return true
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}
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