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为什么 systemd network.service 会抱怨“无法加载文件‘/etc/sysconfig/network-scripts/ifcfg-lo’”

tag-icon • tag-icon centos linux-networking centos7 systemd rhel7
为什么 systemd network.service 会抱怨“无法加载文件‘/etc/sysconfig/network-scripts/ifcfg-lo’”

我有几个全新的 CentOS 7 系统，使用 Kickstart 安装。

当我重新启动网络时，我注意到奇怪的错误，上面写着“ Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'”。这个错误实际上毫无意义，因为 ifcfg-lo 文件存在，而且在我看来这很正常。系统似乎运行正常，那么为什么网络服务会抱怨呢？

[root@host3 ~]# cat /etc/sysconfig/network-scripts/ifcfg-lo 
DEVICE=lo
IPADDR=127.0.0.1
NETMASK=255.0.0.0
NETWORK=127.0.0.0
# If you're having problems with gated making 127.0.0.0/8 a martian,
# you can change this to something else (255.255.255.255, for example)
BROADCAST=127.255.255.255
ONBOOT=yes
NAME=loopback
[root@host3 ~]#


[root@host3 ~]# systemctl restart network
[root@host3 ~]# journalctl -xe -u network.service
...
-- Subject: Unit network.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit network.service has begun starting up.
Sep 30 15:02:56 host3.example.org network[36432]: Bringing up loopback interface:  Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Sep 30 15:02:56 host3.example.org network[36432]: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Sep 30 15:02:56 host3.example.org network[36432]: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Sep 30 15:02:56 host3.example.org network[36432]: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Sep 30 15:02:56 host3.example.org network[36432]: [  OK  ]
Sep 30 15:02:56 host3.example.org network[36432]: Bringing up interface eth0:  Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/3)
Sep 30 15:02:56 host3.example.org network[36432]: [  OK  ]
Sep 30 15:02:56 host3.example.org systemd[1]: Started LSB: Bring up/down networking.
-- Subject: Unit network.service has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit network.service has finished starting up.
-- 
-- The start-up result is done.
[root@host3 ~]#

更新回答@SmallLoanOf1M 的问题。实际设备在启动后似乎已启动并运行。据我所知，“未知”字段似乎正常。

[root@host3 ~]# ip addr show dev lo
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
[root@host3 ~]#

答案1

Red Hat 目前正在跟踪此错误，请参阅此知识文章。

修复：添加NM_CONTROLLED=no到/etc/sysconfig/network-scripts/ifcfg-lo。

根本原因：NetworkManager 中的 ifcfg-rh 插件不支持环回接口类型，并在系统日志中记录有关它的消息。

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