On 03/13/2018 02:45 PM, Ed Greshko wrote:

A while back I needed virtmanager to access an ISO file which resides on an NFS mount.  So, I enabled virt_use_nfs.

Today I was doing some research to help someone else and I noticed that "semanage boolean -l" shows.

virt_use_nfs                   (on  ,  on)  Allow virt to use nfs

According to the header of the output the first "on" is the state while the second is default.  Since I had to enable it I would have thought I would see

virt_use_nfs                   (on  ,  off)  Allow virt to use nfs

Am I missing something?

Hi Ed,

It's because "semanage boolean -m " will modify actual state and also default value which is important for reboot.

Next tool for changing values of boolean is "setsebool" if you use:

# setsebool virt_use_nfs=1 ; this will turn on mentioned boolean but it will be off after reboot.

# setsebool -P virt_use_nfs=1 ; will turn on mentioned boolean and it will be persistent, it stay on after reboot.

So:

If you use: semanage boolean -m --on virt_use_nfs is same as setsebool -P virt_use_nfs=1 and result will be:

virt_use_nfs (on , on) Allow virt to use nfs

If you use setsebool virt_use_nfs=1 result will be:

virt_use_nfs (on , off) Allow virt to use nfs

I hope it's clear now.

Lukas.

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Lukas Vrabec Software Engineer, Security Technologies Red Hat, Inc.