問題：
VMWare虛擬機安裝了centos7 ，突然發現連接不上，進入系統使用ifconfig命令查看網絡設備，發現無外網網卡。
（推薦教程：centos教程）
如下：
[root@localhost?~]#?ifconfig lo:?flags=73<up>??mtu?65536 ????????inet?127.0.0.1??netmask?255.0.0.0 ????????inet6?::1??prefixlen?128??scopeid?0x10<host> ????????loop??txqueuelen?1000??(Local?Loopback) ????????RX?packets?12??bytes?1068?(1.0?KiB) ????????RX?errors?0??dropped?0??overruns?0??frame?0 ????????TX?packets?12??bytes?1068?(1.0?KiB) ????????TX?errors?0??dropped?0?overruns?0??carrier?0??collisions?0 virbr0:?flags=4099<up>??mtu?1500 ????????inet?192.168.122.1??netmask?255.255.255.0??broadcast?192.168.122.255 ????????ether?52:54:00:f6:af:41??txqueuelen?1000??(Ethernet) ????????RX?packets?0??bytes?0?(0.0?B) ????????RX?errors?0??dropped?0??overruns?0??frame?0 ????????TX?packets?0??bytes?0?(0.0?B) ????????TX?errors?0??dropped?0?overruns?0??carrier?0??collisions?0</up></host></up>
重啟網卡試試看。結果報錯了！報錯信息如下：
[root@localhost?~]#?systemctl?status?network ●?network.service?-?LSB:?Bring?up/down?networking ???Loaded:?loaded?(/etc/rc.d/init.d/network;?bad;?vendor?preset:?disabled) ???Active:?failed?(Result:?exit-code)?since?Mon?2020-09-28?09:59:00?CST;?9s?ago ?????Docs:?man:systemd-sysv-generator(8) ??Process:?13344?ExecStart=/etc/rc.d/init.d/network?start?(code=exited,?status=1/FAILURE) Sep?28?09:59:00?localhost.localdomain?network[13344]:?RTNETLINK?answers:?File... Sep?28?09:59:00?localhost.localdomain?network[13344]:?RTNETLINK?answers:?File... Sep?28?09:59:00?localhost.localdomain?network[13344]:?RTNETLINK?answers:?File... Sep?28?09:59:00?localhost.localdomain?network[13344]:?RTNETLINK?answers:?File... Sep?28?09:59:00?localhost.localdomain?network[13344]:?RTNETLINK?answers:?File... Sep?28?09:59:00?localhost.localdomain?network[13344]:?RTNETLINK?answers:?File... Sep?28?09:59:00?localhost.localdomain?systemd[1]:?network.service:?control?pr... Sep?28?09:59:00?localhost.localdomain?systemd[1]:?Failed?to?start?LSB:?Bring?... Sep?28?09:59:00?localhost.localdomain?systemd[1]:?Unit?network.service?entere... Sep?28?09:59:00?localhost.localdomain?systemd[1]:?network.service?failed. Hint:?Some?lines?were?ellipsized,?use?-l?to?show?in?full.
出現此現象的原因一般是系統的?NetworkManager?管理套件出現了問題
Sep?28?09:59:00?localhost.localdomain?systemd[1]:?Failed?to?start?LSB:?Bring?...
所以我們要停止這個套件的服務
[root@localhost?~]#?systemctl?stop?NetworkManager
然后重啟網卡試試
[root@localhost?~]#?systemctl?restart?network.service
沒有報錯，是不是可以了呢？我們查看網絡設備
[root@localhost?~]#?ifconfig ens33:?flags=4163<up>??mtu?1500 ????????inet?192.168.100.15??netmask?255.255.255.0??broadcast?192.168.100.255 ????????inet6?fe80::20c:29ff:fe35:e8d7??prefixlen?64??scopeid?0x20<link> ????????ether?00:0c:29:35:e8:d7??txqueuelen?1000??(Ethernet) ????????RX?packets?9??bytes?626?(626.0?B) ????????RX?errors?0??dropped?0??overruns?0??frame?0 ????????TX?packets?32??bytes?4309?(4.2?KiB) ????????TX?errors?0??dropped?0?overruns?0??carrier?0??collisions?0 lo:?flags=73<up>??mtu?65536 ????????inet?127.0.0.1??netmask?255.0.0.0 ????????inet6?::1??prefixlen?128??scopeid?0x10<host> ????????loop??txqueuelen?1000??(Local?Loopback) ????????RX?packets?12??bytes?1068?(1.0?KiB) ????????RX?errors?0??dropped?0??overruns?0??frame?0 ????????TX?packets?12??bytes?1068?(1.0?KiB) ????????TX?errors?0??dropped?0?overruns?0??carrier?0??collisions?0 virbr0:?flags=4099<up>??mtu?1500 ????????inet?192.168.122.1??netmask?255.255.255.0??broadcast?192.168.122.255 ????????ether?52:54:00:f6:af:41??txqueuelen?1000??(Ethernet) ????????RX?packets?0??bytes?0?(0.0?B) ????????RX?errors?0??dropped?0??overruns?0??frame?0 ????????TX?packets?0??bytes?0?(0.0?B) ????????TX?errors?0??dropped?0?overruns?0??carrier?0??collisions?0</up></host></up></up>
出現外網網卡了，為了防止重啟后 NetworkManager 再次開啟，我們這是不讓它開機啟動
systemctl?disable?NetworkManager
完成！
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