networking.service拒绝启动时启动（无法启动lo，文件存在）
由于我尝试设置加密交换分区（ 加密交换分区未显示在/ dev / mapper中 ），因此在启动期间出现无法启动networking.service的错误。
这是运行错误消息中描述的命令时获得的信息：
$ systemctl status networking.service ● networking.service - Raise network interfaces Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor preset: enabled) Drop-In: /run/systemd/generator/networking.service.d └─50-insserv.conf-$network.conf Active: failed (Result: exit-code) since Mi 2016-08-10 22:57:45 CEST; 10min ago Docs: man:interfaces(5) Process: 4424 ExecStart=/sbin/ifup -a --read-environment (code=exited, status=1/FAILURE) Process: 4417 ExecStartPre=/bin/sh -c [ "$CONFIGURE_INTERFACES" != "no" ] && [ -n "$(ifquery --read-environment --list --exclude=l Main PID: 4424 (code=exited, status=1/FAILURE) Aug 10 22:57:45 BC-AlkaliMetal systemd[1]: Starting Raise network interfaces... Aug 10 22:57:45 BC-AlkaliMetal ifup[4424]: RTNETLINK answers: File exists Aug 10 22:57:45 BC-AlkaliMetal ifup[4424]: Failed to bring up lo. Aug 10 22:57:45 BC-AlkaliMetal systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE Aug 10 22:57:45 BC-AlkaliMetal systemd[1]: Failed to start Raise network interfaces. Aug 10 22:57:45 BC-AlkaliMetal systemd[1]: networking.service: Unit entered failed state. Aug 10 22:57:45 BC-AlkaliMetal systemd[1]: networking.service: Failed with result 'exit-code'.
感谢@ Rinzwind ，通过刷新lo设备可以暂时解决这个问题：
bytecommander@BC-AlkaliMetal:~$ sudo ip addr flush dev lo bytecommander@BC-AlkaliMetal:~$ sudo service networking start bytecommander@BC-AlkaliMetal:~$ systemctl status networking.service ● networking.service - Raise network interfaces Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor preset: enabled) Drop-In: /run/systemd/generator/networking.service.d └─50-insserv.conf-$network.conf Active: active (exited) since Mi 2016-08-10 22:55:06 CEST; 5s ago Docs: man:interfaces(5) Process: 9057 ExecStart=/sbin/ifup -a --read-environment (code=exited, status=0/SUCCESS) Process: 9052 ExecStartPre=/bin/sh -c [ "$CONFIGURE_INTERFACES" != "no" ] && [ -n "$(ifquery --read-environment --list --exclude=l Main PID: 9057 (code=exited, status=0/SUCCESS) CGroup: /system.slice/networking.service Aug 10 22:55:06 BC-AlkaliMetal systemd[1]: Starting Raise network interfaces... Aug 10 22:55:06 BC-AlkaliMetal systemd[1]: Started Raise network interfaces.
我在下次重启时再次遇到同样的问题。
这是我的/etc/network/interfaces配置文件：
# interfaces(5) file used by ifup(8) and ifdown(8) iface lo inet static address 127.0.0.1 netmask 255.0.0.0
这里有什么问题以及如何解决？
在/etc/network/inerfaces错误配置了loopback接口：
iface lo inet static address 127.0.0.1 netmask 255.0.0.0
环回接口（ lo ）被认为是系统的“特殊”，需要进行分类。 为了便于此，应删除对loopback接口的任何引用，并替换为默认值：
auto lo iface lo inet loopback
进行此更改后重新启动networking服务应该允许系统正确地抓取它并修复错误。