[one-users] BOOTPROTO, DHCP_HOSTNAME, and vm IPs in Sunstone

[kerryhall .]

It sounds like it's not really possible for a DHCP client to suggest an IP
to the DHCP server.

I think I would like to make a feature request: easy DHCP integration.

Does my use case make sense? I can clarify further if needed.

Thanks!!

On Mon, Sep 8, 2014 at 12:35 PM, kerryhall . <kerryhall at gmail.com> wrote:

> Javier,
>
> Thank you for your help.
>
> I am considering going with the following option (if this is possible)
>
> Run bash script on boot that sets the DHCP_HOSTNAME to the hostname,
> removes the NETMASK, IPADDR, and GATEWAY lines from
> /etc/sysconfig/network-scripts/ifcfg-eth0, sets the BOOTPROTO to dhcp, and
> restarts networking. I have a bash script already that will do this, and it
> gives the desired result. I will then simply ignore the IP listed in
> sunstone and deal with hostnames only. My script is written in such a way
> that it can be run multiple times without issue.
>
> I just need to figure out how to include this bash script and have to run
> automatically when a new vm is spun up, but it looks like there should be
> plenty of documentation on how to do this.
>
> I am unsure how to use a DHCP client to suggest an IP to the DHCP server,
> or if DHCP supports this.
>
> Thanks!!
> Kerry
>
> On Mon, Sep 8, 2014 at 1:42 AM, Javier Fontan <jfontan at opennebula.org>
> wrote:
>
>> The context packages are meant to be used with static networking. To
>> add that parameters to network configuration you can do one of these
>> things:
>>
>> * Create the network configuration in the base images manually and do
>> not set network contextualization in OpenNebula so they are not
>> overwritten.
>> * Modify the context packages to add those parameters [1]
>>
>> For the third thing there is no way to do it. OpenNebula gets an IP
>> from the network pool and assigns it to the NIC. There is no way to
>> change it after it is selected and there is no external method of
>> selecting the IP. What you can do is configure DHCP so it picks the
>> same IP as OpenNebula had selected for the VM. The MAC addresses are
>> generated from the MAC prefix and the IP, you can configure DHCP with
>> those mac/ip pairs.
>>
>> MAC = PREFIX + IP in hex
>>
>> 02:00:0a:00:00:01 = 02:00 + 10.0.0.1 (in hex is 0a:00:00:01)
>>
>> [1]
>> https://github.com/OpenNebula/addon-context-linux/blob/master/base_rpm/etc/one-context.d/00-network#L103-L114
>>
>> On Sat, Sep 6, 2014 at 12:23 AM, kerryhall . <kerryhall at gmail.com> wrote:
>> > Hi folks,
>> >
>> > I have a small ONE cluster that I am currently setting up on 4.8. I
>> have a
>> > ethernet network model, and I have added the following line to my
>> template:
>> >
>> > SET_HOSTNAME="$NAME.mydomain.int"
>> >
>> > So far so good, but I need to be able to do the following three things:
>> > 1. set "BOOTPROTO=dhcp" in /etc/sysconfig/network-scripts/ifcfg-eth0 on
>> new
>> > vms
>> > 2. set "DHCP_HOSTNAME="$NAME.mydomain.int" on new vms
>> > 3. set the "IP" field in sunstone to vm's IP address provided by DHCP
>> >
>> > How do I accomplish these items? I was thinking run a bash script on vm
>> > startup for items 1 and 2, unless there is a builtin ONE way to do
>> this, but
>> > what about item 3? Is there just a straight up DHCP networking model I
>> can
>> > use to make this easier? Does anyone currently use ONE with DHCP?
>> >
>> > Thanks!!
>> > Kerry
>> >
>> > _______________________________________________
>> > Users mailing list
>> > Users at lists.opennebula.org
>> > http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>> >
>>
>>
>>
>> --
>> Javier Fontán Muiños
>> Developer
>> OpenNebula - Flexible Enterprise Cloud Made Simple
>> www.OpenNebula.org | @OpenNebula | github.com/jfontan
>>
>
>
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