Tim Thank you for your comments. I am still having a problem in trying to visualize a few things. I hope you can persevere with me on this. Sorry to be so lengthy on something that seems more than obvious to others on the list. Let me explain. Back in the days of Linux kernel 2.2.x I purchased VMWARE (for Linux) which was intended -- in non technical terms -- to be installed on top of or into my existing (SuSE 6.2 or 6.4 or equivalent installed distribution using kernel 2.2.x) Linux distribution. I just followed the instructions and it worked but I had no real insight into the matter. Then a few weeks ago a chap on the [SLE] list said he had downloaded Xen and installed it on top of or into his existing SuSE 9.1 (kernel 2.6.x) distribution installation. He indicated (just as with VMWARE) that he had a virtual Linux distribution installed on top of his existing or primary Linux installation. He indicated that both the initial installation and the virtual one ran concurrently. Although, that is probably not a techincally correct way of talking about these things. So when reading the tutorial and installation web pages for Xen I was predisposed to interpret this material from that same standpoint. In otherwords, I either properly or improperly assumed that there must be a 2.4.x or 2.6.x Linux system already up and working with the servers such as NFS, Telnet, SSH, portmap, and others as well the NIC and other physical interface devices all working. In my mind it was this already installed and working distribution that would become the (basis) GUEST OS for DOMAIN 0 once the kernel was modified (ported) and installed becoming joined to Xen. When I used VMWARE I just followed instructions but did not appreciate the reasoning or proprietary software architecture behind those instructions. Because I now want to work with the source code of Xen and the Linux kernel I want very much to develop an accurate and proper insight. That is why I am now dwelling on this issue which was supposed to be my point #1 of 4 high level points in my previous email. So now I will ask my question. Is what I have assumed correct, must there be an existing 2.4 or 2.6.x kernel based Linux installation up and running which must be modified (kernel modification or ported) to run Xen? It is my understanding that the Xen source code installation or the binary installation both require a properly pre installed fully functional Linux system as the basis of Xen operation. Once it''s (pre installed linux distribution) 2.4.x or 2.6.x kernel has been modified to work with the Xen software and tools we have created this Linux distribution into an Xen-based system called Domain 0 that becomes so when shutdown and then booted??? If my assuption correctly follows the Xen documentation then my first point should have read: NOTE:: If this point is flawed by the assumpition that there must be a fully functional pre existing 2.4 or 2.6.x Linux sytem then my thinking is all screwed up. It would not be the first time. BTW, by OS I don''t mean just the kernel. Some consider the entire installation the OS -- an obvious mutation. I don''t know how Xen documentation defines OS. For some people the kernel is the OS as it is the primary layer. For others the distribution less the desk top, games, graphical applications, office packages and any non command line controlled packages constitute the OS. I use the latter definition. So if OS means just the kernel code then I will have to significantly change my point #1. The following detail is what I meant to imply by my point #1. #1 -- The BUILD: The Xen distribution includes 3 main components (Xen itself, ports of Linux 2.4 and 2.6.x kernels to run on (with) Xen, and user-space tools required to manage an Xen-based system) all of which assumes the existence of an already installed and fully fuctional pre existing Linux system which must be adapted (to become the default Xen Linux build identified as DOMAIN 0. Domain 0 is the primary layer (controlled by the Xen package) and consists of the GUEST OS (the adapted pre existing Linux system) hosted by a secure pseudo virtual machine (a controlled execution environment using the adapted or ported kernel and Xen tools and processess to run and monitor parts of the GUEST OS (entire installed linux system?)). The pre existing system once so adapted and running under Xen control contains support for relatively modern server-class network and disk hardware. The Xen process (called xend) runs in highest privilege in DOMAIN 0 and it''s code detects and starts secondary processors, sets up interrupt routing, time slicing, and performs PCI bus enumeration as well as offloads hardware support issues to DOMAIN 0 GUEST OS which is the modified pre existing Linux installed distribution. As such, Xen provides a secure virtual machine for this GUEST OS, builds other domains using an OS installed in a root file system placed on a partition and booted from that partition, manages their virtual devices and performs administrative tasks. My next question: What exactly is an HTTP/S server -- apparently it is a requirement for browser administration access to a Xen-based system? Is Apache such a server and if not can it be turned into such a server??? One more question: Regarding the source code. I have been reviewing Python and C (gcc/gcc++) and was wondering if there was a high level diagram showing dependencies (hierarchy based on caller and called) and code utilized (python, C, binary insertions, etc.)??? Based on what I am learning here (mostly from you) I have been constructing a very high level chart showing levels, key Xen processes, and stuff like that. I will send you a copy once I am sure the information is correct and properly represents what is happening. Thank you very much in advance for your comments and advice. Ted
Hi Ted, On Wed, Mar 02, 2005 at 08:32:20PM -0700, Ted Hilts wrote:> Is what I have assumed correct, must there be an existing 2.4 or 2.6.x > kernel based Linux installation up and running which must be modified > (kernel modification or ported) to run Xen?Yes. Domain 0 is basically a linux 2.6 distribution with a kernel that has been ported to run on top of Xen.> It is my understanding that > the Xen source code installation or the binary installation both require > a properly pre installed fully functional Linux system as the basis of > Xen operation.Yep.> Once it''s (pre installed linux distribution) 2.4.x or > 2.6.x kernel has been modified to work with the Xen software and tools > we have created this Linux distribution into an Xen-based system called > Domain 0 that becomes so when shutdown and then booted???Yep. Once you have your bootloader set up, it boots Xen and then the kernel of domain 0 on top of it. http://www.cl.cam.ac.uk/netos/xen/readmes/user/user.html#SECTION02240000000000000000 (That user manual also has a general overview of how Xen is meant to work, which I think answers most of your other questions.)> My next question: > What exactly is an HTTP/S server -- apparently it is a requirement for > browser administration access to a Xen-based system? Is Apache such a > server and if not can it be turned into such a server???I''m not sure where you got that requirement -- it''s needed for Xenoboot, but that''s an entirely separate project, and not necessary at all for Xen. (And incidentally, yes. http://httpd.apache.org/docs-2.0/ssl/ssl_intro.html)> One more question: > Regarding the source code. I have been reviewing Python and C > (gcc/gcc++) and was wondering if there was a high level diagram showing > dependencies (hierarchy based on caller and called) and code utilized > (python, C, binary insertions, etc.)???I don''t believe so, but someone on the list might correct me. :) Tim. -- Tim Deegan (My opinions, not the University''s) Systems Research Group University of Cambridge Computer Laboratory ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
Hi Ted,> Is what I have assumed correct, must there be an existing 2.4 or 2.6.x > kernel based Linux installation up and running which must be modified > (kernel modification or ported) to run Xen?Yes.> It is my understanding that > the Xen source code installation or the binary installation both require > a properly pre installed fully functional Linux system as the basis of > Xen operation. Once it''s (pre installed linux distribution) 2.4.x or > 2.6.x kernel has been modified to work with the Xen software and tools > we have created this Linux distribution into an Xen-based system called > Domain 0 that becomes so when shutdown and then booted???Yes.> #1 -- The BUILD: > The Xen distribution includes 3 main components (Xen itself, ports of > Linux 2.4 and 2.6.x kernels to run on (with) Xen, and user-space tools > required to manage an Xen-based system) all of which assumes the > existence of an already installed and fully fuctional pre existing > Linux system which must be adapted (to become the default Xen Linux > build identified as DOMAIN 0.Correct.> The Xen > process (called xend) runs in highest privilege in DOMAIN 0 and it''s > code detects and starts secondary processors, sets up interrupt routing, > time slicing, and performs PCI bus enumeration as well as offloads > hardware support issues to DOMAIN 0 GUEST OS which is the modified pre > existing Linux installed distribution.You''re misunderstanding here - the lowlevel stuff (secondary processors, interrupt routing, PCI, scheduling domains, etc, etc) happens in Xen. Xen != xend. Xen itself sits *below* the kernels of all the domains on the system (including domain 0) and handles the low-level details of the system. The guest kernels are ported to run on top of Xen by using the interfaces it provides. Xend is a management process that deals with the high-level management side of the system. It builds domains, records what domains are running, sends them control messages, provides access to their consoles via TCP etc. Xend isn''t required for the system to run, just to perform these management-plane functions.> As such, Xen provides a secure > virtual machine for this GUEST OS, builds other domains using an OS > installed in a root file system placed on a partition and booted from > that partition, manages their virtual devices and performs > administrative tasks.Root filesystems can be stored anywhere dom0 can access like a block device. Files, LVM volumes, MD devices, whole disk drives, partiitons, network block devices, etc. etc.> My next question: > What exactly is an HTTP/S server -- apparently it is a requirement for > browser administration access to a Xen-based system? Is Apache such a > server and if not can it be turned into such a server???HTTPS? It''s a secured version of HTTP. I don''t think you shouldn''t need to install anything extra to make this work - Twisted includes its own HTTP server. (btw, Apache can serve over HTTPS but we don''t use it in Xen)> One more question: > Regarding the source code. I have been reviewing Python and C > (gcc/gcc++) and was wondering if there was a high level diagram showing > dependencies (hierarchy based on caller and called) and code utilized > (python, C, binary insertions, etc.)???Nope, not really :-) The Xen User Manual, Xend manual and Xen Interface Manual (in the docs) directory might help you understand a bit more about the system. To comprehend the source code itself, I''m afraid there''s not really any kind of map. HTH, Mark> Based on what I am learning here (mostly from you) I have been > constructing a very high level chart showing levels, key Xen processes, > and stuff like that. I will send you a copy once I am sure the > information is correct and properly represents what is happening. > > Thank you very much in advance for your comments and advice. > > Ted------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
>>My next question: >>What exactly is an HTTP/S server -- apparently it is a requirement for >>browser administration access to a Xen-based system? Is Apache such a >>server and if not can it be turned into such a server??? >> >> > >HTTPS? It''s a secured version of HTTP. I don''t think you shouldn''t need to >install anything extra to make this work - Twisted includes its own HTTP >server. > >(btw, Apache can serve over HTTPS but we don''t use it in Xen) > >netstat -anp excerpt of Xen 2.0.4 on CentOS 3.4: tcp 0 0 0.0.0.0:8000 0.0.0.0:* LISTEN 17856/python tcp 0 0 0.0.0.0:8001 0.0.0.0:* LISTEN 17856/python tcp 0 0 0.0.0.0:8002 0.0.0.0:* LISTEN 17855/xfrd tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN 17977/python User manual says this can be configured via /usr/lib/python2.3/site-packages/xen/sv/params.py. This file does not exist in the /usr/lib/python*, but /etc/xen/xend-config.sxp includes: # Port xend should use for the HTTP interface. (xend-port 8000) Questions: 1) xend web interface appears on port 8080 (non SSL). Is the xend-config.sxp parameter not honored? 2) Does Twisted natively support SSL? I found conflicting statements in my brief research. 3) What is listening on ports 8000 and 8001? 4) Related subject, how is xfrd (port 8002) secured against malicious domain transfers? Rich ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
Rich Persaud wrote:> Questions: > > 1) xend web interface appears on port 8080 (non SSL). Is the > xend-config.sxp parameter not honored?I''m not sure. I''m reasonably sure that even if you could support changing the port, changing it to 443 would not automatically make it use SSL.> 2) Does Twisted natively support SSL? I found conflicting statements > in my brief research.I''m not sure about "native" but I''m quite sure you can use SSL with Twisted.> 3) What is listening on ports 8000 and 8001?Xend listens on 8000 (provides a web interface). 8001 is used by Xend for events.> 4) Related subject, how is xfrd (port 8002) secured against malicious > domain transfers?It''s not. This is one of the reasons why VM-Tools takes such a different approach to domain migration. All of the tools in VM-Tools are small and single purposed. One of these tools (vm-create) will have the ability to read a saved image from standard input. Another tool (vm-save) will be able to save an image to standard output. Migration is simply a matter of piping vm-save to an instance of vm-create executed via ssh. The transport is actually transparent to the migration process. You could just as easily use rexec, or write a simple remote shell that did IP-level filtering instead of authentication. This approach gives you a wide variety of choices in terms of signing, sealing, and authentication mechanisms. Since ssh uses pam, you instantly are tied into most existing single sign-on environments (through pam_krb5, pam_winbind, etc.). While using ssh as the transport is debatable, I believe tying into pam is inevitable for any migration implementation. Of course, VM-Tools is still a work in progress. Someone is currently working on migration support. We''re hoping to have it available by the end of the month. Regards,> > Rich > > > > > > ------------------------------------------------------- > SF email is sponsored by - The IT Product Guide > Read honest & candid reviews on hundreds of IT Products from real users. > Discover which products truly live up to the hype. Start reading now. > http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/xen-devel >------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
OK, let me list all the ports involved: * 8000 - Xend''s HTTP interface for control * 8001 - from Anthony''s e-mail this is Xend''s event port * 8002 - from Anthony''s e-mail this is xfrd''s (control???) port * 8080 - this is the HTTP port for the XenSV web interface The situation regarding web interfaces is a bit confused. Xend serves a basic web interface on 8000 if you connect with a web browser or communicates using an SXP-based protocol if you connect using xm. XenSV is a pretty web interface that runs as a separate server. You connect to it using a browser pointed at port 8080. It issues commands to Xend using the SXP-based protocol on port 8000 (!). AFAIK, neither of these use SSL. Xend can be secured by only allowing connections from localhost but XenSV cannot, so you should only use it in an environment where you have reason to trust your network!> > 1) xend web interface appears on port 8080 (non SSL). Is the > > xend-config.sxp parameter not honored? > > I''m not sure. I''m reasonably sure that even if you could support > changing the port, changing it to 443 would not automatically make it > use SSL.The parameter in the Xend config file is for Xend''s HTTP control interface (i.e. to make this other than 8000). This is not the same as the XenSV web interface, which is at 8080. The XenSV one is the one you have to edit a Python file to change the port :-/ HTH, Mark> > 2) Does Twisted natively support SSL? I found conflicting statements > > in my brief research. > > I''m not sure about "native" but I''m quite sure you can use SSL with > Twisted. > > > 3) What is listening on ports 8000 and 8001? > > Xend listens on 8000 (provides a web interface). 8001 is used by Xend > for events. > > > 4) Related subject, how is xfrd (port 8002) secured against malicious > > domain transfers? > > It''s not. This is one of the reasons why VM-Tools takes such a > different approach to domain migration. > > All of the tools in VM-Tools are small and single purposed. One of > these tools (vm-create) will have the ability to read a saved image from > standard input. Another tool (vm-save) will be able to save an image to > standard output. > > Migration is simply a matter of piping vm-save to an instance of > vm-create executed via ssh. > > The transport is actually transparent to the migration process. You > could just as easily use rexec, or write a simple remote shell that did > IP-level filtering instead of authentication. > > This approach gives you a wide variety of choices in terms of signing, > sealing, and authentication mechanisms. Since ssh uses pam, you > instantly are tied into most existing single sign-on environments > (through pam_krb5, pam_winbind, etc.). While using ssh as the transport > is debatable, I believe tying into pam is inevitable for any migration > implementation. > > Of course, VM-Tools is still a work in progress. Someone is currently > working on migration support. We''re hoping to have it available by the > end of the month. > > Regards, > > > Rich > > > > > > > > > > > > ------------------------------------------------------- > > SF email is sponsored by - The IT Product Guide > > Read honest & candid reviews on hundreds of IT Products from real users. > > Discover which products truly live up to the hype. Start reading now. > > http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click > > _______________________________________________ > > Xen-devel mailing list > > Xen-devel@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/xen-devel------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
On Thu, 3 Mar 2005, Anthony Liguori wrote:> Rich Persaud wrote: > >> Questions: >> >> 1) xend web interface appears on port 8080 (non SSL). Is the >> xend-config.sxp parameter not honored? > > I''m not sure. I''m reasonably sure that even if you could support changing > the port, changing it to 443 would not automatically make it use SSL. > >> 2) Does Twisted natively support SSL? I found conflicting statements in my >> brief research. > > I''m not sure about "native" but I''m quite sure you can use SSL with Twisted.I''m sure I saw it mentioned: you might use stunnel (http://www.stunnel.org/) to make SSL wrappers for 8080 and whatnot. -- Matt Piechota Key Available from pgp.mit.edu PGP Key fingerprint = FC90 4D65 2F8A 38E9 D1A8 FABB 7AE8 C194 5EC8 9CAD ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
Mark Thankyou for your complete set of answers -- you scratched where you seemed to know I would be itchy. I have been over the manuals a number of times -- they are well written and I have no complaints. But I seemed unable to completely "get it as intended". You have bridged that problem for me. Thanks to both you and Tim. I will try to download Tim''s latest CD effort and test it but there is a good chance I will be unsuccessful in dowloading a very large file. By way of introduction. One of the reasons why I wanted to be CERTAIN on these matters is because I would like to participate where I can on this list even though green around the ears with the whole subject of virtual machines. Getting information over the internet is for me a major difficulty. Today, I expect to install SuSE 9.1 (which I have working on another Linux machine) onto a Linux machine where I have 20 GIG -- a full hard drive I can free up. I may wait until I can make this a 200 Gig drive. Or I may go ahead and use the present 20 Gig drive for a learning exercise and then replace it. The idea is I want to create a specific area in my Lan for this Xen virtual technology. Later, for this same machine, I expect to replace another two 20 Gig drives for 200 Gig drives for the same reason (my point #4 in previous email). I have plans but no money for a network storage unit consisting of 8 200 Gig drives if the cost of acquiring these drives drops. Also, I would like to get a 64 bit Linux machine and deploy it for the same reason. Certainly if I can manage this I will be able to provide a good test bed. But first I have to develop some meaningful experience. Too bad there is not a "Xen For Dummnies" manual, that might do the trick. I''m a retired IT person. Before I retired I did a lot of code and database development. Now, I do some code development but only to support various information processing that serves as content to web pages. I do my development work in my LAN (consisting of some 16 machines), six Linux, 3 XP (ugh), and the remainder Win95. Two Linux machines do double duty as gateways to the Internet handling two Dial Up (about 28k max) (ugh) telephone lines and other work. I do perl development and other tasks on the Linux machines including uploading web pages to my USA based web server. There are no alternatives like Sattelite or DSL or cable services available as I live with my wife and my LAN and our dogs and cats in a rural area on a farm 60 miles NE of Edmonton, the capital city of the province of Alberta in Canada. My ISP has assured me this situation will not change. Dial Up for ever. There''s gotta be an affordable way around this. I cannot afford business rates for a corporate sattelite connection and the Bell "sattelite in -- ground line out" arrangement does not work well for ftp and it not supported for ftp. I had hoped to use one of the Linux machines operating from my LAN out over sattelite to the Internet instead of the web server I operate in the USA. I have about 2 Gig (used) on the USA web server. IF I ever get such a connection to my LAN I will mirror all the information you people want to make available to the public and the list, The 3 XP machines do double duty as data acquistion over the internet, shared storage, and web development. (the whole effort is non commercial non profit and religious) and are used as data servers to my main work activities. The acquired data is used for web page content for my USA based web server. My bandwidth (even with 2 telephone lines) is inadequate for my needs. So when I have the need to get technical information I have to divert one of the XP machines to that task so the data acquisition packages can get that information for me. When I''m not sure exactly what and where the needed information exists such as was the case with Xen I aim my data acquisition tools at a web site effectively mirroring it and it''s references. But this takes a lot of time to happen (but frees me up for other pressing issues) because the other XP machines are also going 7x24 round the clock every day. Then of course there is hoards of email and sometimes it takes half a day to get several hundred emails a day processed and get rid of the viruses and worms. Yes, I have a Windows Netscape based mail client (ugh) and am in the process of changing this to Linux. But I have to free up time before that can happen. Enough of that. If I want to surf the Internet and poke around reading web pages not yet downloaded then I have to suspend running processes that are often reluctant to suspend because the CPUs are going flat out. I have been trying to get a service where I pay for specified downloaded information put onto a CD or DVD and then mailed to me. Apparently there is someone that provides this service but this person has not responded to my email. Given that context, your complete set of answers is extremely helpful and I thank you and Tim again. Thanks very much, Ted Mark Williamson wrote:>Hi Ted, > > > >>Is what I have assumed correct, must there be an existing 2.4 or 2.6.x >>kernel based Linux installation up and running which must be modified >>(kernel modification or ported) to run Xen? >> >> > >Yes. > > > >>It is my understanding that >>the Xen source code installation or the binary installation both require >>a properly pre installed fully functional Linux system as the basis of >>Xen operation. Once it''s (pre installed linux distribution) 2.4.x or >>2.6.x kernel has been modified to work with the Xen software and tools >>we have created this Linux distribution into an Xen-based system called >>Domain 0 that becomes so when shutdown and then booted??? >> >> > >Yes. > > > >>#1 -- The BUILD: >>The Xen distribution includes 3 main components (Xen itself, ports of >>Linux 2.4 and 2.6.x kernels to run on (with) Xen, and user-space tools >>required to manage an Xen-based system) all of which assumes the >>existence of an already installed and fully fuctional pre existing >>Linux system which must be adapted (to become the default Xen Linux >>build identified as DOMAIN 0. >> >> > >Correct. > > > >>The Xen >>process (called xend) runs in highest privilege in DOMAIN 0 and it''s >>code detects and starts secondary processors, sets up interrupt routing, >>time slicing, and performs PCI bus enumeration as well as offloads >>hardware support issues to DOMAIN 0 GUEST OS which is the modified pre >>existing Linux installed distribution. >> >> > >You''re misunderstanding here - the lowlevel stuff (secondary processors, >interrupt routing, PCI, scheduling domains, etc, etc) happens in Xen. Xen != >xend. > >Xen itself sits *below* the kernels of all the domains on the system >(including domain 0) and handles the low-level details of the system. The >guest kernels are ported to run on top of Xen by using the interfaces it >provides. > >Xend is a management process that deals with the high-level management side of >the system. It builds domains, records what domains are running, sends them >control messages, provides access to their consoles via TCP etc. Xend isn''t >required for the system to run, just to perform these management-plane >functions. > > > >>As such, Xen provides a secure >>virtual machine for this GUEST OS, builds other domains using an OS >>installed in a root file system placed on a partition and booted from >>that partition, manages their virtual devices and performs >>administrative tasks. >> >> > >Root filesystems can be stored anywhere dom0 can access like a block device. >Files, LVM volumes, MD devices, whole disk drives, partiitons, network block >devices, etc. etc. > > > >>My next question: >>What exactly is an HTTP/S server -- apparently it is a requirement for >>browser administration access to a Xen-based system? Is Apache such a >>server and if not can it be turned into such a server??? >> >> > >HTTPS? It''s a secured version of HTTP. I don''t think you shouldn''t need to >install anything extra to make this work - Twisted includes its own HTTP >server. > >(btw, Apache can serve over HTTPS but we don''t use it in Xen) > > > >>One more question: >>Regarding the source code. I have been reviewing Python and C >>(gcc/gcc++) and was wondering if there was a high level diagram showing >>dependencies (hierarchy based on caller and called) and code utilized >>(python, C, binary insertions, etc.)??? >> >> > >Nope, not really :-) The Xen User Manual, Xend manual and Xen Interface >Manual (in the docs) directory might help you understand a bit more about the >system. To comprehend the source code itself, I''m afraid there''s not really >any kind of map. > >HTH, >Mark > > > >>Based on what I am learning here (mostly from you) I have been >>constructing a very high level chart showing levels, key Xen processes, >>and stuff like that. I will send you a copy once I am sure the >>information is correct and properly represents what is happening. >> >>Thank you very much in advance for your comments and advice. >> >>Ted >> >> > > >
Rich Persaud wrote:> 2) Does Twisted natively support SSL? I found conflicting statements in > my brief research.With pyopenssl installed it does. ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel