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When using ifdown or ifup for the lookback interface in CentOS 7:

[root@localhost etc]# ifup lo

I have got the error below:

Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'

However if I use the ifconfig command, it shows the command(ifdown or ifup) works with success.

As I tested, the use of the ifconfig lo up/down does not show any signs of errors.

What is happening?

EDIT

I checked the ifcfg-lo file, it shows the info below:

[root@localhost etc]# ls -la /etc/sysconfig/network-scripts/ifcfg-lo
-rw-r--r--. 1 root root 254 Jun 26 20:07 /etc/sysconfig/network-scripts/ifcfg-lo
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  • ifconfig does not use network-scripts ; please edit the question and add to it the output of ls -la /etc/sysconfig/network-scripts/ifcfg-lo – Rui F Ribeiro Jun 26 '17 at 12:41
  • Does chmod a+rx /etc/sysconfig/network-scripts/ifcfg-lo correct the situation? (probably not, I suspect it must be something with selinux...) – Rui F Ribeiro Jun 26 '17 at 13:01
  • @RuiFRibeiro it still reports the error. and in the front, I tells it even reports the mentioned error but the command works. – three-blocks Jun 26 '17 at 13:06
  • Or the command appears to work. I am sure, I do not use selinux, someone else will hopefully help you. – Rui F Ribeiro Jun 26 '17 at 13:08
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First of all stop Using ifconfig command anymore with Centos 7 version and later versions because it doesnt give you full information about your network card parameters (For example if you assigened 2 IP addresses to your Card) instead use ipa command or ip addr show command. Second This problem is currently being tracked as a bug by Red Hat. To Fix this problem: Add NM_CONTROLLED=no to /etc/sysconfig/network-scripts/ifcfg-lo. Root Cause: ifcfg-rh plugin in NetworkManager does not support loopback interface type and logs a message about it in system log.

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If you want to fully resolve this issues, update to higher version. And in current version you can fix it by adding "NM_CONTROLLED=no" to /etc/sysconfig/network-scripts/ifcfg-lo configuration file, then restart the network following this link https://access.redhat.com/solutions/1549693

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    Please add some details from the external webpage in your answer, using the page as a reference rather than the primary resource. – Munir Jan 5 '18 at 3:58

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