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From Muhammad Adeel Zahid <16030...@lums.edu.pk>
Subject Re: Cloudstack and KVM installation with IP addresses allocated by DHCP
Date Wed, 22 Mar 2017 21:35:25 GMT
Hi Dag,


I have been able to arrange a switch and create a new subnet of my own behind that switch.
That way, I am able to install KVM and cloudstack on single machine. Haven't tried the second
machine. I think, it should work too.


Now, I am basically interested in snapshot capability of instances, that is, I want to create
an instance, install bulk of things on it and then take a snapshot  of it. Later on, I would
want to use the same snapshot to create new instances. Is it possible with KVM? I have read
somewhere that this functionality is only available with xenserver and vmware? If that is
so, can I have another host added to same zone that uses a different virtualization technology
(xenserver or vmware) than my first host (KVM, also the same node running ACS management)?
Can you recommend any of them please? I am looking at this whole thing from R&D paradigm
and scalability is not a problem at the moment and I want to go with easier-to-setup solution.


Regards

Adeel

________________________________
From: Muhammad Adeel Zahid <16030053@lums.edu.pk>
Sent: Wednesday, March 22, 2017 11:19:34 PM
To: users@cloudstack.apache.org
Subject: Re: Cloudstack and KVM installation with IP addresses allocated by DHCP

Hi Dag,


Thanks for the insight. Let me have a look at alternatives & I will get back [??]

________________________________
From: Dag Sonstebo <Dag.Sonstebo@shapeblue.com>
Sent: Wednesday, March 22, 2017 6:32:05 PM
To: users@cloudstack.apache.org
Subject: Re: Cloudstack and KVM installation with IP addresses allocated by DHCP

Hi Adeel,

This would most likely get you into trouble with your red tape admins – if you simply set
the IP address 10.103.72.65 statically and let’s say your DHCP lease time is 24 hours –
then after 24 hours the DHCP server will not have seen any DHCP renewals (DHCP starts the
renewal process after half the lease time – i.e. in this case 12 hours), and therefore assumes
the address is no longer in use. Another host may therefore pick up the same IP and you end
up with IP conflicts.

Regards,
Dag Sonstebo
Cloud Architect
ShapeBlue

On 22/03/2017, 12:39, "Muhammad Adeel Zahid" <16030053@lums.edu.pk> wrote:

    Hi Dag,


    DHCP and its settings are beyond my control. I will have to go through some procedures
(aka red tape) to get the exclusions static IPs bound to ACS and KVM. For now,  what I am
thinking to do is, connect to network and get an IP 10.103.72.65 and declare it as static
in network settings of my computer (say ACS management server) and rely on the fact that IP
wouldn't change as long as I don't reconnect.

    Once the testing is done, we can go through the approval procedures for MAC binding and
IP addresses exclusion from DHCP.


    Would it work as I think?


    Regards

    Adeel

    ________________________________
    From: Dag Sonstebo <Dag.Sonstebo@shapeblue.com>
    Sent: Wednesday, March 22, 2017 5:31:12 PM
    To: users@cloudstack.apache.org
    Subject: Re: Cloudstack and KVM installation with IP addresses allocated by DHCP

    Hi Muhammed,

    This is done externally to CloudStack and depends on what DHCP infrastructure you have
in place. All DHCP implementations have the option to reserve an address, i.e. a setting that
confirms your MAC address – e.g. 01:02:03:AA:BB:CC is always handed out the same IP address
– in your case e.g. 10.103.72.65/23. Once you have set this on your DHCP server(s) you can
safely set the IP address statically on your servers if you don’t want to rely on DHCP –
this means you will never have an IP conflict between a statically configured IP address and
your DHCP scope.

    Please note though – you will most likely need more IP addresses for CloudStack than
the 1 (2?) you already have – CloudStack needs more IP addresses for it’s system range.
As a result you are much better off using a subnet without DHCP – or configure an exclusion
in your DHCP scope, e.g. something 10.103.72.1-10.103.72.99, such that you can safely use
this excluded range for CloudStack.

    Regards,
    Dag Sonstebo
    Cloud Architect
    ShapeBlue

    On 22/03/2017, 12:22, "Muhammad Adeel Zahid" <16030053@lums.edu.pk> wrote:

        Thanks Boris and Dag for quick reply.


        @Dag How do I utilize static IP addresses in combination with DHCP reservations?


        I have just installed CentOs and connected to the network on wire. DHCP has given
me 10.103.72.65/23 IP address. What do I need to do from now on?


        Regards

        ________________________________
        From: Dag Sonstebo <Dag.Sonstebo@shapeblue.com>
        Sent: Wednesday, March 22, 2017 4:41:26 PM
        To: users@cloudstack.apache.org
        Subject: Re: Cloudstack and KVM installation with IP addresses allocated by DHCP

        Hi Muhammed,

        This may be possible if your DNS infrastructure is rock solid and is guaranteed to
work from all CloudStack networks (you would possibly also have to set your TTL on your DNS
entries low)  – but all in all I would recommend you utilize static IP addresses, alternatively
in combination with DHCP reservations to ensure you don’t have IP conflicts in your infrastructure.

        Regards,
        Dag Sonstebo
        Cloud Architect
        ShapeBlue

        On 22/03/2017, 11:26, "Muhammad Adeel Zahid" <16030053@lums.edu.pk> wrote:

            Hello guys,


            I have two systems and both of them are connected to a network that allocates
IP addresses using DHCP. I want to install cloudstack management server on the one system
and KVM (hypervisor) on the other system.

            Can I do this? What steps would differ from normal (with static IPs)  ACS and
KVM installation?


            Regards

            Adeel



        Dag.Sonstebo@shapeblue.com
        www.shapeblue.com<http://www.shapeblue.com>
        53 Chandos Place, Covent Garden, London  WC2N 4HSUK
        @shapeblue






    Dag.Sonstebo@shapeblue.com
    www.shapeblue.com<http://www.shapeblue.com>
    53 Chandos Place, Covent Garden, London  WC2N 4HSUK
    @shapeblue






Dag.Sonstebo@shapeblue.com
www.shapeblue.com<http://www.shapeblue.com>
53 Chandos Place, Covent Garden, London  WC2N 4HSUK
@shapeblue




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