某一日，用systemctl –failed查看到如下错误信息，但实际上网络是OK的，真奇怪：
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[root@localhost.localdomain media]# systemctl --failed
UNIT LOAD ACTIVE SUB DESCRIPTION
network.service loaded failed failed LSB: Bring up/down networking
LOAD = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB = The low-level unit activation state, values depend on unit type.
1 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.
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执行此命令来解决这个问题：
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[root@F1A-SWPE ~]# systemctl enable NetworkManager-wait-online.service
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重启后再次用systemctl –failed查看，问题消失：
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[root@localhost.localdomain ~]# systemctl --failed
0 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.
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解决问题的关键跟/usr/lib/systemd/system/NetworkManager-wait-online.service这个文档有关，其内容如下：
[Unit]
Description=Network Manager Wait Online
Requisite=NetworkManager.service
After=NetworkManager.service
Wants=network.target
Before=network.target network-online.target
[Service]
Type=oneshot
ExecStart=/usr/bin/nm-online -q –timeout=30
[Install]
WantedBy=multi-user.target
有兴趣的同学不妨研究一下这个文档就能明了！！
最后sudo service network restart 解决
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