让linux服务器远程开机

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   如果我们的服务器没有部署在本地(通常都会把服务器托管到IDC机房)，而且服务器在机房中不止一台，其中一台被关闭时，则我们可以远程连接一台没有关机的服务器上，然后进行远程开机。

   用yum命令安装远程开机需要的软件:yum install wol

 

如何进行远程开机？

  第一步：首先要确定你的linux服务器是否支持远程开机？登录到目标服务器，用ethtool这个命令打印出网卡的信息
        [root@localhost lhd]# ethtool eth0
        Settings for eth0:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Advertised auto-negotiation: Yes
        Speed: 100Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 32
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: pumbg
        Wake-on: d
        Current message level: 0x00000007 (7)
        Link detected: yes

        可以看到，ethtool把网卡的信息全部列出，我们只关心其中的这两项:
        Supports Wake-on: pumbg
        Wake-on: d
          如果 wake-on 一项值为 d,表示禁用wake on lan
                         值为 g,表示启用 wake on lan
                            
    因为此机器禁用了 wake on lan,所以用下面的命令来启用它:
    [root@localhost lhd]# ethtool -s eth0 wol g

    再用 ethtool命令进行查看,会发现:
    Wake-on: g
            
    OK，目标机器的网卡已经支持了远程开机，下面我们得到它的本地MAC地址:
    [root@localhost lhd]# ifconfig
          eth0      Link encap:Ethernet  HWaddr 00:03:0D:1D:1F:97
          inet addr:192.168.6.101  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:34470 errors:0 dropped:0 overruns:0 frame:0
          TX packets:35377 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:31559763 (30.0 MiB)  TX bytes:5340032 (5.0 MiB)
          Interrupt:5 Base address:0x2c00

    把HWaddr 00:03:0D:1D:1F:97这一项记录下来即可，现在你可以试着把目标机器关闭。

  第二步：开机

     现在我们需要登录到已安装了wakeonlan软件的机器上，在上面执行开机命令:
    
     wol 00:03:0D:1D:1F:97
     稍后就会发现，目标机器已开机可以登录了。

 

[root@localhost lhd]# ifconfig
      eth0      Link encap:Ethernet  HWaddr 00:03:0D:1D:1F:97
      inet addr:192.168.6.101  Mask:255.255.255.0
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
      RX packets:34470 errors:0 dropped:0 overruns:0 frame:0
      TX packets:35377 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000
      RX bytes:31559763 (30.0 MiB)  TX bytes:5340032 (5.0 MiB)
      Interrupt:5 Base address:0x2c00

 

Private Sub Inet1_StateChanged(ByVal State As Integer)
Select Case State
    Case inetctlsobjects.StateConstants.icError
        MsgBox "error"
    Case inetctlsobjects.StateConstants.icResponseCompleted
        Dim bDone As Boolean, a() As Byte
        a = Me.Inet1.GetChunk(1024, 1)
        Open Me.strFilePath For Binary Access Write As #1
        If Len(Me.Inet1.GetHeader("content-length")) > 0 Then
            Me.ProgressBar2.Max = CLng(Me.Inet1.GetHeader("content-length"))
        End If
        DoEvents
        Do While Not bDone And Not Me.bCancel
            Put #1, Loc(1) + 1, a()
            a = Me.Inet1.GetChunk(1024, 1)
            Me.ProgressBar2.Value = Loc(1)
            Me.Label2.Caption = Format(Loc(1) / 1024 / 1024, "0.000") & "/" & _
                Format(Me.ProgressBar2.Max / 1024 / 1024, "0.000")
            If Loc(1) >= Me.ProgressBar2.Max Then bDone = True
        Loop
        Close #1
End Select
End Sub