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When enable_dhcp is False, Config drive or metadata service can be
used to assign static IP addresses to the deployed VM if the image
has cloud_init or something equivalent.<br>
<br>
On 12/17/2014 2:15 AM, Padmanabhan Krishnan wrote:<br>
<blockquote
cite="mid:1517147686.131964.1418804134592.JavaMail.yahoo@jws106138.mail.bf1.yahoo.com"
type="cite">
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<div id="yui_3_16_0_1_1418803625386_3006" style=""
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<div id="yui_3_16_0_1_1418803625386_3016" style=""
class="">Hello,</div>
<div id="yui_3_16_0_1_1418803625386_3011" style=""
class="">I have a question regarding the enable_dhcp
option when creating a network. <br>
</div>
<div id="yui_3_16_0_1_1418803625386_3010" style=""
class=""><br style="" class="">
</div>
<div id="yui_3_16_0_1_1418803625386_3009" style=""
class="">When a VM is attached to a network where
enable_dhcp is False, I understand that the DHCP
namespace is not created for the network and the VM
does not get any IP address after it boots up and
sends a DHCP Discover.</div>
<div id="yui_3_16_0_1_1418803625386_3005" style=""
class="">But, I also see that the Neutron port is
filled with the fixed IP value from the network pool
even though there's no DHCP associated with the
subnet. </div>
<div id="yui_3_16_0_1_1418803625386_3320" style=""
class="">So, for such VM's, does one need to
statically configure the IP address with whatever
Neutron has allocated from the pool?</div>
<div id="yui_3_16_0_1_1418803625386_3162" style=""
class=""><br style="" class="">
</div>
<div id="yui_3_16_0_1_1418803625386_3163" style=""
class="">What exactly is the use case of the above? </div>
<div id="yui_3_16_0_1_1418803625386_3164" style=""
class=""><br style="" class="">
</div>
<div id="yui_3_16_0_1_1418803625386_3165" style=""
class="">I do understand that for providing public
network access to VM's, an external network is
generally created with enable-dhcp option set to
False. Is it only for this purpose?</div>
<div id="yui_3_16_0_1_1418803625386_3167" style=""
class=""><br style="" class="">
</div>
<div id="yui_3_16_0_1_1418803625386_3166" style=""
class="">
<div id="yui_3_16_0_1_1418803625386_3411">I was
thinking of a case of external/provider DHCP
servers from where VM's can get their IP addresses
and when one does not want to use L3 agent/DVR. In
such cases, one may want to disable DHCP when
creating networks. Isn't this a use-case?</div>
<div id="yui_3_16_0_1_1418803625386_3519"><br>
</div>
<div id="yui_3_16_0_1_1418803625386_3520" dir="ltr">Appreciate
any response or corrections with my above
understanding.<br>
</div>
</div>
<div id="yui_3_16_0_1_1418803625386_3229" style=""
class=""><br style="" class="">
</div>
<div id="yui_3_16_0_1_1418803625386_3216" style=""
class="">Thanks,</div>
<div id="yui_3_16_0_1_1418803625386_3228" style=""
class="">Paddu </div>
</div>
</div>
</div>
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</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
John Kasperski</pre>
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