[rhos-list] dnsmasq cannot start properly

[Chris Wright]

* Shixiong Shang (shshang) (shshang at cisco.com) wrote:
> Hi, guys:
> 
> I am using dnsmasq as DHCP server to assign IP address to VMs. The "dnsmasq" process seemed to start ok.
> 
> nobody    2919     1  0 23:16 ?        00:00:00 /usr/sbin/dnsmasq --strict-order --bind-interfaces --local=// --domain-needed --pid-file=/var/run/libvirt/network/default.pid --conf-file= --except-interface lo --listen-address 192.168.122.1 --dhcp-range 192.168.122.2,192.168.122.254 --dhcp-leasefile=/var/lib/libvirt/dnsmasq/default.leases --dhcp-lease-max=253 --dhcp-no-override --dhcp-hostsfile=/var/lib/libvirt/dnsmasq/default.hostsfile --addn-hosts=/var/lib/libvirt/dnsmasq/default.addnhosts

This is the libvirt dnsmasq for running locally (un)managed libvirt
based VMs, NAT'd to the host interface.

> 
> However, I noticed that, all three config files referred by dnsmasq process were all empty. Based on dhcp_agent.ini file, dnsmasq should go to /var/lib/quantum for config files….Why did they load files from /var/lib/libvirt/dnsmasq?
> [root at as-net1 bin]# cd /var/lib/libvirt/dnsmasq/
> [root at as-net1 dnsmasq]# ls -lh
> total 0
> -rw-r--r--. 1 root root 0 Feb 17 23:14 default.addnhosts
> -rw-r--r--. 1 root root 0 Feb 17 23:14 default.hostsfile
> -rw-r--r--. 1 root root 0 Feb  4 10:03 default.leases
> 
> 
> In addition, system log threw the following error message at the time when I restarted dhcp agent:
> 
> Feb 17 23:37:19 as-net1 kernel: type=1400 audit(1361162239.626:560): avc:  denied  { read } for  pid=13252 comm="dnsmasq" name="sh" dev=dm-0 ino=1572867 scontext=system_u:system_r:dnsmasq_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=lnk_file

This is SELinux...you can make sure selinux is in permissive mode

> Feb 17 23:37:19 as-net1 dnsmasq[13251]: cannot run lease-init script /usr/bin/quantum-dhcp-agent-dnsmasq-lease-update: No such file or directory
> Feb 17 23:37:19 as-net1 dnsmasq[13251]: FAILED to start up
> Feb 17 23:37:22 as-net1 dnsmasq[13297]: cannot run lease-init script /usr/bin/quantum-dhcp-agent-dnsmasq-lease-update: No such file or directory
> Feb 17 23:37:22 as-net1 dnsmasq[13297]: FAILED to start up
> 
> When I tried to execute the script manually, it gave me this traceback…..
> 
> [dmd at as-net1 bin]$ /usr/bin/quantum-dhcp-agent-dnsmasq-lease-update
> Traceback (most recent call last):
>   File "/usr/bin/quantum-dhcp-agent-dnsmasq-lease-update", line 20, in <module>
>     dhcp.Dnsmasq.lease_update()
>   File "/usr/lib/python2.6/site-packages/quantum/agent/linux/dhcp.py", line 341, in lease_update
>     action = sys.argv[1]
> IndexError: list index out of range

This may be related to the above, can take a deeper look shortly.

thanks,
-chris