Re: [Xen-users] First time xen install - Xen DomU runs, but can't find "/dev/root"

[G Crowe <gcxenlist@xxxxxxxxxx>]

On 21/10/2013 5:28 PM, Dario Faggioli wrote:
> Well, yes, in the blog post I mention setting up a PXE server, but that
> is for _installing_ _Dom0_. For guests, you really don't need one, you
> can just point your --location to an URL and that's it!
>
> I recommend you trying... It at least look easier than using a local
> webserver, etc.
Ooops, you are right about the PXE server. Sorry.
As far as installinf from a URL, the machine I am trying this on does 
not have a direct connection to the internet, hence me trying to install 
from a DVD image. In order to use a URL to boot I had to create my own 
as there were none already available (that were accessible).
> When doing what? I'm usually able to 'define', 'creade', 'shutdown',
> 'undefine' and 'create' again.
>
> What is your issue with that?
This is probably just my ignorance , please see my output below...
Note that "xl define" and "xl undefine" both return "command not 
implemented".

********************
Scenario 1, stopping and then restarting a DomU
- I can shutdown a DomU with "xm", "xl", from within the DomU with 
"shutdown -r now", or by rebooting Dom0.
- xl seems to lose any memory of the DomU at this point (well, I can't 
figure out how to bring it back) and "xl list" doesn't show it while it 
is stopped.
- xm can remember it and restart it. "xm list" will still list the 
stopped DomU.
- "xl create" seems to want a config file, which I don't have. "xm 
start" just starts the DomU that has already been configured, without 
needing an additional config file.
********************

[root@dhcp1 ~]# xl list
Name                                        ID   Mem VCPUs State   Time(s)
Domain-0                                     0   483     4 r-----     130.5
xen1                                         4   512     1 -b----      12.5
[root@dhcp1 ~]# xm list
Name                                        ID   Mem VCPUs State   Time(s)
Domain-0                                     0   483     4 r-----    130.8
xen1                                         4   512     1 -b----     12.5
[root@dhcp1 ~]# xl shutdown xen1
[root@dhcp1 ~]# xl list
Name                                        ID   Mem VCPUs State   Time(s)
Domain-0                                     0   483     4 r-----     133.9
[root@dhcp1 ~]# xm list
Name                                        ID   Mem VCPUs State   Time(s)
Domain-0                                     0   483     4 r-----    134.2
xen1                                             512 1                13.1
[root@dhcp1 ~]# xl start xen1
command not implemented
[root@dhcp1 ~]# xm start xen1
[root@dhcp1 ~]# xl list
Name                                        ID   Mem VCPUs State   Time(s)
Domain-0                                     0   483     4 r-----     143.8
xen1                                         5   512     1 r-----       2.7
[root@dhcp1 ~]# xm list
Name                                        ID   Mem VCPUs State   Time(s)
Domain-0                                     0   483     4 r-----    144.3
xen1                                         5   512     1 r-----      3.9


********************
Scenario 2, deleting and then recreating a DomU
- I can delete a DomU with "xm destroy xen2" then "xm delete xen2"
- When trying "virt-install" - If xend is not running (it defaults to 
the xl toolchain?) then I cannot recreate xen2 with virt-install.
- If xend is restarted, then the exact same virt-install command will 
recreate the xen2 DomU.
********************
[root@dhcp1 ~]# xl list
Name                                        ID   Mem VCPUs State   Time(s)
Domain-0                                     0   483     4 r-----     165.2
[root@dhcp1 ~]# xm list
Error: Unable to connect to xend: Connection refused. Is xend running?
[root@dhcp1 ~]# virt-install --paravirt --name xen2 --ram 512 --vcpus 1 
-f /dev/fedora_dhcp1/xen2 --network bridge=br0 --location 
http://gcrowe.crowie.net/f18 --graphics none
ERROR    Guest name 'xen2' is already in use.
[root@dhcp1 ~]# xend
[root@dhcp1 ~]# virt-install --paravirt --name xen2 --ram 512 --vcpus 1 
-f /dev/fedora_dhcp1/xen2 --network bridge=br0 --location 
http://gcrowe.crowie.net/f18 --graphics none
Starting install...
<Output truncated here, but the install proceeds normally.>





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