Network Manager post-up script (dispatcher script)

Network manager is supposed to be much better than network, how so?

it supports dnsmasq for one…

Dnsmasq with netowrkmanager

Local name resolution

Also Network Manager supports dispatcher scripts. How can that help? For one, I used to send interface up emails. To do so, all I had to do was put the following script in “/etc/NetworkManager/dispatcher.d”


cd /etc/sysconfig/network-scripts
. ./network-functions

[ -f ../network ] && . ../network

# Notify programs that have requested notification


dnsmasq not starting from NetworkManager with SELinux enabled.

OpenWrt - Dnsmasq
OpenWrt – Dnsmasq (Photo credit: magicfab)


Some time back I posted on dnsmasq starting from Network Manager and how to setup dnsmasq.


Now, couple of days back , I setup dnsmasq in NetworkManager but was astonished to see that there was no dnsmasq running. I checked with dig and saw that there was no response from localhost for dns queries. Checked “ps -eaf|grep dns” and found that there was no dnsmasq running. I knew that once you mention “dns=dnsmasq” in the NetworkManager then it should start up but that was not happening. And then I checked audit log, found that some permissions were denied by SELinux.


First check if dnsmasq is indeed having issues because of SELinux:


grep -C 5 sealert /var/log/messages


If you do see something then time to fix it.


grep dnsmasq /var/log/audit/audit.log
audit2allow -M mypol && semodule -i mypol.pp
systemctl restart NetworkManager


And with this, you should be done, though you might have to repeat this multiple times.



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dnsmasq – use with Network Manager.

Niles Machine Company
Niles Machine Company (Photo credits:


Well if you have not heard about dnsmasq:


Dnsmasq is lightweight, easy to configure DNS forwarder and DHCP server.
It is designed to provide DNS and, optionally, DHCP, to a small network.
It can serve the names of local machines which are not in the global
DNS. The DHCP server integrates with the DNS server and allows machines
with DHCP-allocated addresses to appear in the DNS with names configured
either in each host or in a central configuration file. Dnsmasq supports
static and dynamic DHCP leases and BOOTP for network booting of diskless


and for the installation :


sudo yum install dnsmasq


So, now that it is installed, all you need to do is add the following in file: /etc/NetworkManager/NetworkManager.conf




in the main section. Restart your network manager using sysctl and you should see that command:




should show result like below: 185 IN A 185 IN A 185 IN A 185 IN A
;; Query time: 50 msec
;; WHEN: Mon Jan 14 17:16:39 2013
;; MSG SIZE rcvd: 215


If it does not, then you might want to add a dispatcher to Network Manager that adds localhost to your “/etc/resolv.conf” file. And here is the name of the file – /etc/NetworkManager/dispatcher.d/localhost-prepend and the contents


# Prepend localhost to resolv.conf for dnsmasq

if [[ ! $(grep /etc/resolv.conf) ]]; then
  sed -i '1s|^|nameserver|' /etc/resolv.conf


Thats all there is to it 🙂



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