Re: [Xen-users] Re: Live Migration Config

["Alan Greenspan" <alan@xxxxxxxxxxx>]

For Xen to go mainstream, I think this needs to be easier for the average 
user.  I know I'm repeating myself, but it really should use ordinary config 
file settings like virtually all other inet services.  Also, in whatever 
config file this is going to appear in, the default setting for migration 
should be "all hosts denied".
Alan

> Yeah, iptables is definitely a beast.  In this case though, the commands 
> are pretty sane:
> If you care about security, always run:
>
>  iptables -D INPUT -p tcp --destination-port 8002 -j REJECT
>
> This inserts a rule to disable all traffic to port 8002.  This effectively 
> shuts migration off (#5).  To enable migration from specific addresses, 
> you would then say:
>  iptables -I INPUT -p tcp --source 192.168.1.100 --destination-port 
> 8002 -j ACCEPT
> Which allows migrations to originate from 192.168.1.100.  If you later 
> change your mind, you can say:
>  iptables -D INPUT -p tcp --source 192.168.1.100 --destination-port 
> 8002 -j ACCEPT
> Which disallows migrations from 192.168.1.100.   For added security, you 
> can only enable migration from a given address before you do the migration 
> and then immediately disable it after the migration is done.
> You can replace 192.168.1.100 with a hostname or even a netmask (either in 
> the form 192.168.1.100/8 or 192.168.1.100/255.255.255.0).
> Best of all, you don't have to restart Xend for the rules to take affect.

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