[COLUG] summary of 7/25 meeting: Explorations in Xen part 1 and topics for 8/25

[Tom Hanlon]

Colug,

Meetings:
Sounds like I missed a good one.

I am unable to make the next one..

I am out of the country till the 29.

The Future:
My schedule tends to open up in the fall and winter, and I owe you  
guys a quality presentation. So I will try and work in a presentation.

I have been delivering MySQL training for a year now so I imagine  
that a MySQL presentation should go smoothly and we could go into  
reasonable depth.

I could present on mysql
Performance tuning, Stored Procs, triggers, partitioning , events,  
any interest.

I will even jump into a lively political debate if it comes to that.

DRBD , and Heartbeat .. I could go into that a little bit.

*note*
I delivered a weak presentation once about a year ago as practice for  
me starting with MySQL, I think I can make up for it now :-)

Regards,

Tom Hanlon


On 21 Aug 2007, at 18:22, Jim Wildman wrote:

> After some initial confusion about my ip addresses and some struggles
> getting X forwarding to work correctly, we got down to the
> business of demonstrating Xen.  As a build server we had a Compaq
> DL380G1 running Centos 4 and the following services: dhcp, named,  
> http,
> mrepo, cobbler.  As clients we had 2 Compaq DL360g2 boxes one with 2
> CPU's and 750M of RAM, the other with 1 CPU and 1G of RAM.  Both  
> clients
> were running Centos 5 -xen kernels
>
> I summarized the installation of Xen as:
> 	Install Centos5/RHEL5
> 	configure a repository for installation images
> 	run virt-install or virt-manager to create images
>
> We performed the following tasks
> 	used xm list with and without clients to list
> 	started a previously configured client with xm create
> 	began installation using virt-install
> 	monitored running VM's using xm top and virt-manager
> 	connected to and from VM's using xm console
> 	watched performance with top on the host side
> 	watched performance of the clients with xm top
>
> We discussed issues around
> 	Memory issues.
> 	Device type issues.  What do various devices look like inside the
> 	VM?
> 	How do you use physical partitions?  logical volumes?
> 	Problems with the text client, issues with all the clients in
> 	general such as lack of security, restriction to a single host
>
> There was much interest in live migration of images.
>
> Notes that I took for future topics included
>
> What are tap devices for?
> How is console logging done?
> How much memory does DOM0 use?  require?  Why doesn't the domU memory
> usage impact dom0?  and vice versa.
> How is locking handled for multiple access to the vm's?
> How does migration work?
> Can /etc/xen be moved (turns out it is not needed since the xend's
> transfer the config files during migration)?
>
>
> any comments?
>
> Most likely Russ will be presenting on xen on Saturday.
>
> ---------------------------------------------------------------------- 
> --
> Jim Wildman, CISSP, RHCE       jim at rossberry.com http:// 
> www.rossberry.com
> "Society in every state is a blessing, but Government, even in its  
> best
> state, is a necessary evil; in its worst state, an intolerable one."
> Thomas Paine
> ---------------------------------------------------------------------- 
> --
> Jim Wildman, CISSP, RHCE       jim at rossberry.com http:// 
> www.rossberry.com
> "Society in every state is a blessing, but Government, even in its  
> best
> state, is a necessary evil; in its worst state, an intolerable one."
> Thomas Paine
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