Mailing List Archive: Linux Virtual Server: Users

[lvs-users] New lvs user questions

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raywjohnson at gmail

Jun 9, 2011, 1:33 PM

Post #1 of 6 (617 views)
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[lvs-users] New lvs user questions

Greetings all,

New to the list and to LVS. Just need a bit of insight. Please excuse
these potential newbie questions.

I read through most of the HOWTO (:-1) specifically on the LVS-DR setup
(http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.LVS-DR.html). I
think this is the best way to accomplish my goal.

I have 10 servers, all with regular IPs. One will act as director, the
others as real servers. However, I do not have direct access to them.
Only via SSH login. So my questions are directly related to remote access.

Is setting up LVS via SSH even possible?

Can all the servers have IP aliases that allow me direct access via SSH?

Can I just use normal/public IPs (and not private 192. IPs)? (note: the
director will eventually be set to only allow connections from specified
outside IPs/clients and those connections will have heavy filtering)

Am I missing something critical? :/

Thanks for any info or insight. I will be re-reading the HOWTOs and docs.

--RayJ

_______________________________________________
Please read the documentation before posting - it's available at:
http://www.linuxvirtualserver.org/

LinuxVirtualServer.org mailing list - lvs-users [at] LinuxVirtualServer
Send requests to lvs-users-request [at] LinuxVirtualServer
or go to http://lists.graemef.net/mailman/listinfo/lvs-users

horms at verge

Jun 9, 2011, 5:01 PM

Post #2 of 6 (575 views)
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Re: [lvs-users] New lvs user questions [In reply to]

On Thu, Jun 09, 2011 at 01:33:46PM -0700, Ray W. Johnson wrote:
> Greetings all,
>
> New to the list and to LVS. Just need a bit of insight. Please excuse
> these potential newbie questions.
>
> I read through most of the HOWTO (:-1) specifically on the LVS-DR setup
> (http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.LVS-DR.html). I
> think this is the best way to accomplish my goal.
>
> I have 10 servers, all with regular IPs. One will act as director, the
> others as real servers. However, I do not have direct access to them.
> Only via SSH login. So my questions are directly related to remote access.
>
> Is setting up LVS via SSH even possible?
>
> Can all the servers have IP aliases that allow me direct access via SSH?
>
> Can I just use normal/public IPs (and not private 192. IPs)? (note: the
> director will eventually be set to only allow connections from specified
> outside IPs/clients and those connections will have heavy filtering)
>
> Am I missing something critical? :/
>
> Thanks for any info or insight. I will be re-reading the HOWTOs and docs.

Hi Ray,

the answer to all your questions is Yes.

If you are planning to do this without remote access you
will need to be careful that you don't loose network connectivity
- e.g. due to a misconfiguration while setting things up.
For this reason I would suggest using at least one of the
following if possibile.

1) A separate physical NIC for admin
2) Serial console or other lights-out access

If that is not possible you will just need to be super careful.
I would start with a trial run on machines you do have console
access to.

_______________________________________________
Please read the documentation before posting - it's available at:
http://www.linuxvirtualserver.org/

LinuxVirtualServer.org mailing list - lvs-users [at] LinuxVirtualServer
Send requests to lvs-users-request [at] LinuxVirtualServer
or go to http://lists.graemef.net/mailman/listinfo/lvs-users

raywjohnson at gmail

Jun 9, 2011, 5:46 PM

Post #3 of 6 (574 views)
Permalink

Re: [lvs-users] New lvs user questions [In reply to]

Hi Simon,

Thanks! That will get me started. I will talk to the server owner about
adding a second NIC for direct access ( and recovery from me goofing up
the network ).

--RayJ

> Hi Ray,
>
> the answer to all your questions is Yes.
>
> If you are planning to do this without remote access you
> will need to be careful that you don't loose network connectivity
> - e.g. due to a misconfiguration while setting things up.
> For this reason I would suggest using at least one of the
> following if possibile.
>
> 1) A separate physical NIC for admin
> 2) Serial console or other lights-out access
>
> If that is not possible you will just need to be super careful.
> I would start with a trial run on machines you do have console
> access to.
>
>
>
>
>

_______________________________________________
Please read the documentation before posting - it's available at:
http://www.linuxvirtualserver.org/

LinuxVirtualServer.org mailing list - lvs-users [at] LinuxVirtualServer
Send requests to lvs-users-request [at] LinuxVirtualServer
or go to http://lists.graemef.net/mailman/listinfo/lvs-users

raywjohnson at gmail

Jun 9, 2011, 11:53 PM

Post #4 of 6 (566 views)
Permalink

Re: [lvs-users] New lvs user questions [In reply to]

On 06/09/2011 05:01 PM, Simon Horman wrote:
> On Thu, Jun 09, 2011 at 01:33:46PM -0700, Ray W. Johnson wrote:
>
>> Greetings all,
>>
>> New to the list and to LVS. Just need a bit of insight. Please excuse
>> these potential newbie questions.
>>
>> I read through most of the HOWTO (:-1) specifically on the LVS-DR setup
>> (http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.LVS-DR.html). I
>> think this is the best way to accomplish my goal.
>>
>> I have 10 servers, all with regular IPs. One will act as director, the
>> others as real servers. However, I do not have direct access to them.
>> Only via SSH login. So my questions are directly related to remote access.
>>
>> Is setting up LVS via SSH even possible?
>>
>> Can all the servers have IP aliases that allow me direct access via SSH?
>>
>> Can I just use normal/public IPs (and not private 192. IPs)? (note: the
>> director will eventually be set to only allow connections from specified
>> outside IPs/clients and those connections will have heavy filtering)
>>
>> Am I missing something critical? :/
>>
>> Thanks for any info or insight. I will be re-reading the HOWTOs and docs.
>>
> Hi Ray,
>
> the answer to all your questions is Yes.
>
> If you are planning to do this without remote access you
> will need to be careful that you don't loose network connectivity
> - e.g. due to a misconfiguration while setting things up.
> For this reason I would suggest using at least one of the
> following if possibile.
>
> 1) A separate physical NIC for admin
> 2) Serial console or other lights-out access
>
> If that is not possible you will just need to be super careful.
> I would start with a trial run on machines you do have console
> access to.
>

I will do a trial run on my extra laptop.

The director has kernel version 2.6.18-238.el5. Do I still need to patch
or download one from ftp.kernel.org?

And, the servers need an RIP and VIP, can the VIP's still be private
(192.x.x.x) IPs?

--RayJ

_______________________________________________
Please read the documentation before posting - it's available at:
http://www.linuxvirtualserver.org/

LinuxVirtualServer.org mailing list - lvs-users [at] LinuxVirtualServer
Send requests to lvs-users-request [at] LinuxVirtualServer
or go to http://lists.graemef.net/mailman/listinfo/lvs-users

horms at verge

Jun 10, 2011, 12:39 AM

Post #5 of 6 (567 views)
Permalink

Re: [lvs-users] New lvs user questions [In reply to]

On Thu, Jun 09, 2011 at 11:53:21PM -0700, Ray W. Johnson wrote:
>
>
> On 06/09/2011 05:01 PM, Simon Horman wrote:
> > On Thu, Jun 09, 2011 at 01:33:46PM -0700, Ray W. Johnson wrote:
> >
> >> Greetings all,
> >>
> >> New to the list and to LVS. Just need a bit of insight. Please excuse
> >> these potential newbie questions.
> >>
> >> I read through most of the HOWTO (:-1) specifically on the LVS-DR setup
> >> (http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.LVS-DR.html). I
> >> think this is the best way to accomplish my goal.
> >>
> >> I have 10 servers, all with regular IPs. One will act as director, the
> >> others as real servers. However, I do not have direct access to them.
> >> Only via SSH login. So my questions are directly related to remote access.
> >>
> >> Is setting up LVS via SSH even possible?
> >>
> >> Can all the servers have IP aliases that allow me direct access via SSH?
> >>
> >> Can I just use normal/public IPs (and not private 192. IPs)? (note: the
> >> director will eventually be set to only allow connections from specified
> >> outside IPs/clients and those connections will have heavy filtering)
> >>
> >> Am I missing something critical? :/
> >>
> >> Thanks for any info or insight. I will be re-reading the HOWTOs and docs.
> >>
> > Hi Ray,
> >
> > the answer to all your questions is Yes.
> >
> > If you are planning to do this without remote access you
> > will need to be careful that you don't loose network connectivity
> > - e.g. due to a misconfiguration while setting things up.
> > For this reason I would suggest using at least one of the
> > following if possibile.
> >
> > 1) A separate physical NIC for admin
> > 2) Serial console or other lights-out access
> >
> > If that is not possible you will just need to be super careful.
> > I would start with a trial run on machines you do have console
> > access to.
> >
>
> I will do a trial run on my extra laptop.
>
> The director has kernel version 2.6.18-238.el5. Do I still need to patch
> or download one from ftp.kernel.org?

That version should work fine although many new features have been added
since then. If you want/need the latest version of LVS, the latest kernel
is the best place to be.

> And, the servers need an RIP and VIP, can the VIP's still be private
> (192.x.x.x) IPs?

Yes.

_______________________________________________
Please read the documentation before posting - it's available at:
http://www.linuxvirtualserver.org/

LinuxVirtualServer.org mailing list - lvs-users [at] LinuxVirtualServer
Send requests to lvs-users-request [at] LinuxVirtualServer
or go to http://lists.graemef.net/mailman/listinfo/lvs-users

raywjohnson at gmail

Jun 10, 2011, 12:27 PM

Post #6 of 6 (570 views)
Permalink

Re: [lvs-users] New lvs user questions [In reply to]

On 06/10/2011 12:39 AM, Simon Horman wrote:
> On Thu, Jun 09, 2011 at 11:53:21PM -0700, Ray W. Johnson wrote:
>
>>
>> On 06/09/2011 05:01 PM, Simon Horman wrote:
>>
>>> On Thu, Jun 09, 2011 at 01:33:46PM -0700, Ray W. Johnson wrote:
>>>
>>>
>>>> Greetings all,
>>>>
>>>> New to the list and to LVS. Just need a bit of insight. Please excuse
>>>> these potential newbie questions.
>>>>
>>>> I read through most of the HOWTO (:-1) specifically on the LVS-DR setup
>>>> (http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.LVS-DR.html). I
>>>> think this is the best way to accomplish my goal.
>>>>
>>>> I have 10 servers, all with regular IPs. One will act as director, the
>>>> others as real servers. However, I do not have direct access to them.
>>>> Only via SSH login. So my questions are directly related to remote access.
>>>>
>>>> Is setting up LVS via SSH even possible?
>>>>
>>>> Can all the servers have IP aliases that allow me direct access via SSH?
>>>>
>>>> Can I just use normal/public IPs (and not private 192. IPs)? (note: the
>>>> director will eventually be set to only allow connections from specified
>>>> outside IPs/clients and those connections will have heavy filtering)
>>>>
>>>> Am I missing something critical? :/
>>>>
>>>> Thanks for any info or insight. I will be re-reading the HOWTOs and docs.
>>>>
>>>>
>>> Hi Ray,
>>>
>>> the answer to all your questions is Yes.
>>>
>>> If you are planning to do this without remote access you
>>> will need to be careful that you don't loose network connectivity
>>> - e.g. due to a misconfiguration while setting things up.
>>> For this reason I would suggest using at least one of the
>>> following if possibile.
>>>
>>> 1) A separate physical NIC for admin
>>> 2) Serial console or other lights-out access
>>>
>>> If that is not possible you will just need to be super careful.
>>> I would start with a trial run on machines you do have console
>>> access to.
>>>
>>>
>> I will do a trial run on my extra laptop.
>>
>> The director has kernel version 2.6.18-238.el5. Do I still need to patch
>> or download one from ftp.kernel.org?
>>
> That version should work fine although many new features have been added
> since then. If you want/need the latest version of LVS, the latest kernel
> is the best place to be.
>
>
>> And, the servers need an RIP and VIP, can the VIP's still be private
>> (192.x.x.x) IPs?
>>
> Yes.
>
>
Sweet! Thanks! I will get the latest kernel.

--RayJ

_______________________________________________
Please read the documentation before posting - it's available at:
http://www.linuxvirtualserver.org/

LinuxVirtualServer.org mailing list - lvs-users [at] LinuxVirtualServer
Send requests to lvs-users-request [at] LinuxVirtualServer
or go to http://lists.graemef.net/mailman/listinfo/lvs-users

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