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Re: [Libvir] [RFC] Life-cycle Management of the domain



Hi,

What the following things boil down to is that 
I hold file that formed in SXP for Life-cycle Management.

What do you think of my idea?

Thanks
Saori Fukuta

On Fri, 13 Apr 2007 16:26:37 +0900 Saori Fukuta wrote:
> Hi all,
> 
> I've been thinking about a way to change the hardware allocation on the 
> Life-cycle. And I have some idea. Can I hear your comments about this?
> 
> 1. Necessity of function
> These are conceivable cases of changing hardware allocation.
> 
>     CASE A: Dynamic change
>             change the allocation dynamically
>             -> change the hardware allocation for now, 
>                and next time, start by the allocation before it changes.
>             (example of use)
>             At night, change the hardware allocation.
>             Next morning rebooting, return it.
> 
>     CASE B: Static change
>             change the allocation statically
>             -> do not change the hardware allocation for now, 
>                but set the allocation for starting next.
>             (example of use)
>             Next time, want to start by the value that set before.
>             
>     CASE C: Permanent change 
>             change the allocation permanently
>             -> change the hardware allocation,
>                and start next time with the same setting.
>             (example of use)
>             want to start by same value permanently.
> 
> The current situation of virsh command with Xen.
>                      CASE A /  CASE B / CASE C
>     virsh setmem       x         x        o
>     virsh setmaxmem    x         x        o
>     virsh setvcpus     o         x        x
>     virsh vcpupin      o         x        x
> 
> And I find that the value on Xenstore is used for starting the domain 
> next time.
> 
> 
> 2. Change of command
> We need to add 3 options to the virsh command of changing allocation 
> for CASE A, B, and C. So I propose the following options.
> 
>     option name
>     --dynamic ... dynamic change option (default) for CASE A
>     --static  ... static change option for CASE B
>     --perm    ... permanent change option for CASE C
> 
> If no option is specified, the Default option("--dynamic") will be chosen.
> 
>     (example)
>     Example of changing the memory allocation 256MB to 512MB.
>         # virsh dominfo Domain-A | grep "Used memory"
>         Used memory:    256000 kB
> 
>     CASE A: Dynamic change
>         # virsh setmem Domain-A 512000
>         or
>         # virsh setmem Domain-A 512000 --dynamic
> 
>         # virsh dominfo Domain-A | grep "Used memory"
>         Used memory:    512000 kB
> 
>     CASE B: Static change
>         # virsh setmem Domain-A 512000 --static
> 
>         # virsh dominfo Domain-A | grep "Used memory"
>         Used memory:    256000 kB
> 
>     CASE C: Permanent change
>         # virsh setmem Domain-A 512000 --perm
> 
>         # virsh dominfo Domain-A | grep "Used memory"
>         Used memory:    512000 kB
> 
> 3. Summary of the ways
> Xen does not provide these cases. So I propose that we start the domain 
> by a file for libvirt.
> 
>     3.1 When starting the domain first time, 
>         copy a file from config.sxp(/etc/xen config file) to virt.sxp(libvirt).
> 
>         (image)
>                     +--- Xend ---+      +-- libvirt --+
>         +--------+  l config.sxp ------->   virt.sxp  l  +--------+
>         lDomain-Al  +------------+ copy +-------------+  lDomain-Al
>         lmem=256 l                                       lmem=256 l
>         +--------+  ---------------------------------->  +--------+
>                          "virsh start Domain-A"
> 
>     3.2 When starting the domain,
>         if they have virt.sxp(libvirt) define that file.
> 
>         (image)
>         Step.1 value of the domain before start.
> 
>                     +--- Xend --------------------+
>                     l +-Xenstore-+ +-config.sxp-+ l
>         before      l l mem=256  l l mem=256    l l
>         +--------+  l +----------+ +------------+ l
>         lDomain-Al  +-----------------------------+
>         lmem=256 l 
>         +--------+  ---------------------------------> continue Step.2
> 
>         Step.2 define the value of virt.sxp.
> 
>                             +--- Xend ---------------------+
>                             l +-Xenstore-+  +-config.sxp-+ l
>                          +----> mem=512  l -> mem=512    l l
>                  define  l  l +----------+  +------------+ l
>                          l  +------------------------------+
>                          l
>                     +--- l --------+ 
>                     l +- l --------+ 
>         before      l l mem=512  l l 
>         +--------+  l +-virt.sxp-+ l 
>         lDomain-Al  +--- libvirt --+ 
>         lmem=256 l                                     
>         +--------+  ---------------------------------> continue Step.3
> 
>         Step.3 start the domain and copy a file from config.sxp to virt.sxp.
> 
>                     +--- Xend ---------------------+ 
>                     l +-Xenstore-+  +-config.sxp-+ l 
>                     l l mem=512  l  l mem=512    l l 
>                     l +--- l ----+  +----- l ----+ l 
>                     +----- l ------------- l ------+ 
>                            l               l           +--- libvirt --+ 
>                            l               l copy      l +-virt.sxp-+ l 
>                            l               +-------------> mem=256  l l 
>         before             l                           l +----------+ l 
>         +--------+         l start       +--------+    +--------------+ 
>         lDomain-Al         +------------>lDomain-Al 
>         lmem=256 l                       lmem=512 l 
>         +--------+  -------------------> +--------+ 
>                      "virsh start Domain-A"
> 
>     3.3 When changing the allocation statically or permanently,
>         write the change into virt.sxp.
>         (When changing the allocation dynamically, do nothing)
> 
>         CASE A: Dynamic change
>         (image)            
>                     +--- Xend --------------------+             ll next start
>                     l +-Xenstore-+ +-config.sxp-+ l             ll
>                     l l mem=512  l l mem=512    l l             ll
>                     l +----------+ +------------+ l             ll
>                     +-----------------------------+             ll
>                     +--- libvirt --+                            ll
>                     l +-virt.sxp-+ l                            ll           
>         before      l l mem=256  l l                 after      ll       
>         +--------+  l +----------+ l                 +--------+ ll +--------+ 
>         lDomain-Al  +--------------+                 lDomain-Al ll lDomain-Al 
>         lmem=256 l                                   lmem=512 l ll lmem=256 l 
>         +--------+  -------------------------------> +--------+ ll +--------+ 
>                      "virsh setmem Domain-A 512000"             ll
> 
>         (state transition matrix)
>         +-------------------------------------------------------------+
>          operational procedure   Xend                 libvirt
>                                  Xenstore config.sxp  virt.sxp
>         +-------------------------------------------------------------+
>          1.start the domain      mem=X,   mem=X   --->mem=X(create file)
>          2.change the allocation mem=Y,   mem=Y       mem=X(no change)
>            mem X to Y dynamically 
>          3.stop the domain       mem=Y,   mem=Y       mem=X
>          4.start the domain      <------- <-----------define value
>                                  mem=X,   mem=X   --->mem=X(create file)
>          5.delete the domain     del      del         delete file 
>         +-------------------------------------------------------------+
> 
>         CASE B: Static change
>         (image)            
>                     +--- Xend --------------------+             ll next start
>                     l +-Xenstore-+ +-config.sxp-+ l             ll
>                     l l mem=256  l l mem=256    l l             ll
>                     l +----------+ +------------+ l             ll
>                     +-----------------------------+             ll
>                     +--- libvirt --+                            ll
>                     l +-virt.sxp-+ l                            ll           
>         before      l l mem=512  l l                 after      ll       
>         +--------+  l +----------+ l                 +--------+ ll +--------+ 
>         lDomain-Al  +--------------+                 lDomain-Al ll lDomain-Al 
>         lmem=256 l                                   lmem=256 l ll lmem=512 l 
>         +--------+  -------------------------------> +--------+ ll +--------+ 
>                      "virsh setmem Domain-A 512000 --static"    ll
> 
>         (state transition matrix)
>         +-------------------------------------------------------------+
>          operational procedure   Xend                 libvirt
>                                  Xenstore config.sxp  virt.sxp
>         +-------------------------------------------------------------+
>          1.start the domain      mem=X,   mem=X   --->mem=X(create file)
>          2.change the allocation mem=X,   mem=Y       mem=Y(change to Y)
>            mem X to Y statically 
>          3.stop the domain       mem=X,   mem=X       mem=Y
>          4.start the domain      <------- <-----------define value
>                                  mem=Y,   mem=Y   --->mem=Y(create file)
>          5.delete the domain     del      del         delete file 
>         +-------------------------------------------------------------+
> 
>         CASE C: Permanent change
>         (image)            
>                     +--- Xend --------------------+             ll next start
>                     l +-Xenstore-+ +-config.sxp-+ l             ll
>                     l l mem=512  l l mem=512    l l             ll
>                     l +----------+ +------------+ l             ll
>                     +-----------------------------+             ll
>                     +--- libvirt --+                            ll
>                     l +-virt.sxp-+ l                            ll           
>         before      l l mem=512  l l                 after      ll       
>         +--------+  l +----------+ l                 +--------+ ll +--------+ 
>         lDomain-Al  +--------------+                 lDomain-Al ll lDomain-Al 
>         lmem=256 l                                   lmem=512 l ll lmem=512 l 
>         +--------+  -------------------------------> +--------+ ll +--------+ 
>                      "virsh setmem Domain-A 512000 --perm"      ll
> 
>         (state transition matrix)
>         +-------------------------------------------------------------+
>          operational procedure   Xend                 libvirt
>                                  Xenstore config.sxp  virt.sxp
>         +-------------------------------------------------------------+
>          1.start the domain      mem=X,   mem=X   --->mem=X(create file)
>          2.change the allocation mem=Y,   mem=Y       mem=Y(change to Y)
>            mem X to Y permanently  
>          3.stop the domain       mem=Y,   mem=Y       mem=Y
>          4.start the domain      <------- <-----------define value
>                                  mem=Y,   mem=Y   --->mem=Y(create file)
>          5.delete the domain     del      del         delete file 
>         +-------------------------------------------------------------+
> 
> Thanks,
> Saori Fukuta
> 
> 
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