[libvirt] [PATCH] Openvz: how to use a nondefault config

[Evgeniy Sokolov]

Hi Anton,

I'm sorry for delay. I was on vacation.

> Hi all.
> 
> When libvirt creates an OpenVZ machine, it does smth like
>   # vzctl create $ctid --ostemplate `ostemplate`
> And we can't specify an --config `config` argument. In this case vzctl 
> chooses
> a default config file (a value of CONFIG variable from /etc/vz/vz.conf).
> 
> But there are cases when we want to specify a config file directly, as in
>   # vzctl create $ctid --ostemplate `ostemplate` --config `config`
> 
> I think, that we can try to use the same `ostemplate` name as --config 
> value, if corresponding template exists,
> i.e., if there is a file /etc/vz/conf/ve-`ostemplate`.conf-sample, 
> libvirt will run a command
>   # vzctl create $ctid --ostemplate `ostemplate` --config `ostemplate`
> Otherwise, it will run it's default command
>   # vzctl create $ctid --ostemplate `ostemplate`
> (the same arguments.)

Config /etc/vz/conf/ve-XXX.conf-sample define there are many parameters 
like  memory, CPU etc. This parameters are not properties of <filesystem>.

Daniel, usage of pre-defined configs in really usefull. Can we create 
additional tag inside <domain></domain>?

> 
> -----------
> Example of creating a machine with nondefault config:
> 
> 1. Create /etc/vz/conf/ve-altlinux-test.conf-sample
> 2. Create /var/lib/vz/template/cache/altlinux-test.tar
> 3. Use libvirt with (hypothetical) XML:
> <domain type="openvz">
>   <name>100</name>
>   <memory>1</memory>
>   <os><type>exe</type></os>
>   <devices>
>     <filesystem type="template">
>       <source name="altlinux-test"/>
>       <target dir="/"/>
>     </filesystem>
>   </devices>
> </domain>
> 
> -----------
> Example of creating a machine with default config:
> 
> 1. Ensure there is no /etc/vz/conf/ve-altlinux-test.conf-sample
> 2. Create /var/lib/vz/template/cache/altlinux-test.tar
> 3. Use libvirt with (the same as above) XML file
> -----------
> 
> 
> ------------------------------------------------------------------------
> 
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