My goal is to create a xen domain using lvm backed storage. It sounds simple and probably is but I am getting caught down in the details. I am using RH5 which I am hopefull will be similar enough to be able to ask on this list. Its the only list on https://www.redhat.com/mailman/listinfo with xen in the name.
Up to now I have been using virt-install to create new domains. It takes care of a lot of detail but this is a lot like spoon feeding and you learn nothing plus it is limited in capabilities at the moment.
Confusion one:
When creating a new domain it creates a config file that xm can use:
name = "test03"
uuid = "80bd6bda-c559-3a68-643c-df0f29d672b9"
maxmem = 200
memory = 200
vcpus = 1
bootloader = "/usr/bin/pygrub"
>>>vfb = [ ]
disk = [ "tap:aio:/root/temppart/test03.img,xvda,w" ]
vif = [ "mac=00:16:3e:24:15:79,bridge=virbr0" ]
When I dump the config using virsh it adds some additinal paramters:
<os>
<type>linux</type>
<kernel>/var/lib/xen/boot_kernel.nNlfNC</kernel>
<initrd>/var/lib/xen/boot_ramdisk.jV4otH</initrd>
<cmdline>ro root=/dev/VolGroup00/LogVol00 console=xvc0</cmdline>
This names changes every time you restart the xen domain. What creates this <random> kernel and initrd and would using the following config be the same thing:
<kernel>/boot/vmlinuz-2.6.18-53.el5xen</kernel>
<initrd>/boot/initrd-2.6.18-53.el5xen.img</initrd>
I am also a bit confused about the <cmdline> value and how it is used and what it should be. If anybody has a brief explanation of how this fits into the greater scheme of things it would be really appreciated.
Lastly, I have managed to create a xml config file for virsh which does not immediatly complain about any errors. However I am still unsure how/where to specify the installation (http) source. I dont want to copy a existing installation I want to create a new one, would this just be a kernel parameter?
The config file I am using:
<domain type='xen' id='3'>
<name>test-a-01</name>
<os>
<type>linux</type>
<kernel>/boot/vmlinuz-2.6.18-53.el5xen </kernel>
<initrd>/boot/initrd-2.6.18-53.el5xen.img</initrd>
<cmdline>ro root=/dev/VolGroup00/LogVol00 console=xvc0</cmdline>
</os>
<memory>202144</memory>
<vcpu>1</vcpu>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<devices>
<interface type='bridge'>
<source bridge='virbr0'/>
<script path='vif-bridge'/>
</interface>
<disk type='phy' device='disk'>
<driver name='tap' type='aio'/>
<source file='/root/parts/test-a-01.img'/>
<target dev='xvda'/>
</disk>
<console tty='/dev/pts/2'/>
</devices>
</domain>
Regards
--
Gerhardus Geldenhuis
Registered Linux User #193352
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