linux服务器远程网络开机（wake on lan）

通过网络可以远程开关机，某些时候比较方便管理机器

检查服务器是否支持远程网络开机

[root@lab5101 ~]# ethtool eth0
Settings for eth0:
    Supported ports: [ TP ]
    Supported link modes: 10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Full 
    Supported pause frame use: No
    Supports auto-negotiation: Yes
    Advertised link modes: 
                            10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Full 
    Advertised pause frame use: No
    Advertised auto-negotiation: Yes
    Speed: 1000Mb/s
    Duplex: Full
    Port: Twisted Pair
    PHYAD: 2
    Transceiver: internal
    Auto-negotiation: onMDI-X: on
    Supports Wake-on: pumbg
    Wake-on: g
    Current message level: 0x00000007 (7) 
                            drv probe linkLink detected: yes

注意这两项：

Supports Wake-on: pumbg
Wake-on: g

可以通过命令设置，也可以去bios中设置
d表示禁用，g表示开启

[root@lab5101 ~]# ethtool -s eth0 wol g

拿到网卡的mac地址

[root@lab5101 ~]# ifconfig 
eth0  Link encap:Ethernet HWaddr 00:30:67:6D:3D:7C 
     inet addr:192.168.5.101 Bcast:192.168.255.255 Mask:255.255.0.0 
     inet6 addr: fe80::215:17ff:fed0:be85/64 Scope:Link
     UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 
     RX packets:17752 errors:0 dropped:4 overruns:0 frame:0 
     TX packets:1101 errors:0 dropped:0 overruns:0 carrier:0 
     collisions:0 txqueuelen:1000 
     RX bytes:1288183 (1.2 MiB) TX bytes:262525 (256.3 KiB) 
     Interrupt:16 Memory:b1100000-b1120000 
lo   Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 
     inet6 addr: ::1/128 Scope:Host 
     UP LOOPBACK RUNNING MTU:65536 Metric:1 
     RX packets:62566 errors:0 dropped:0 overruns:0 frame:0 
     TX packets:62566 errors:0 dropped:0 overruns:0 carrier:0 
     collisions:0 txqueuelen:0 
     RX bytes:91540393 (87.2 MiB) TX bytes:91540393 (87.2 MiB)

得到：

HWaddr 00:15:17:D0:BE:85 

在另外一台服务器上执行：

[root@lab901 ~]# ether-wake -i eth0 00:30:67:6d:3d:7c