centos7 重新插上网线 需要重启网络服务
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参考技术Avim /etc/sysconfig/network-scripts/ifcfg-ens33(ifcfg-ens33这个文件因不同虚拟机而不同,有些虚拟机的文件名是ifcfg-eth0,其他的都是固定的路径)
进入之后发现 ONBOOT的属性设置为 no
,于是就把 no 改为 yes
ONBOOT=yes意思是:系统在启动时激活网卡 保存退出编辑之后使用service network restart命令重启网卡服务即可联网 设置完成之后下次就不会出现这样的问题了!
How To:Linux下如何通过命令检查网卡是否插上网线
主要工具为ethtool来检查,主要关注的字段为"Link detected",注意如下的输出,其中em4实际物理上并未插上网线,而em1是插上网线的:
# ethtool em4 Settings for em4: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Half 1000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Half 1000baseT/Full Advertised pause frame use: Symmetric Advertised auto-negotiation: Yes Speed: Unknown! Duplex: Unknown! (255) Port: Twisted Pair PHYAD: 2 Transceiver: internal Auto-negotiation: on MDI-X: Unknown Supports Wake-on: g Wake-on: d Current message level: 0x000000ff (255) drv probe link timer ifdown ifup rx_err tx_err Link detected: no # ethtool em1 Settings for em1: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Half 1000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Half 1000baseT/Full Advertised pause frame use: Symmetric Advertised auto-negotiation: Yes Link partner advertised link modes: 100baseT/Full 1000baseT/Full Link partner advertised pause frame use: Transmit-only Link partner advertised auto-negotiation: Yes Speed: 1000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 1 Transceiver: internal Auto-negotiation: on MDI-X: on Supports Wake-on: g Wake-on: d Current message level: 0x000000ff (255) drv probe link timer ifdown ifup rx_err tx_err Link detected: yes
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