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running the root server with chbind'ed ip address

create following under /sbin/vinit (add the ip's you want)

#!/bin/sh
exec /sbin/chbind --ip 10.20.20.10/16 --bcast 10.20.255.255 -- /sbin/init $@

chmod +x /sbin/vinit

and then add init=/sbin/vinit to the kernel boot options (append= with Lilo)

Note: now the loopback interface on 127.0.0.1 is inaccessible from the root server. A workaround is to use the outside interfaces address in /etc/hosts instead 127.0.0.1 so:

10.20.20.10 localhost

instead

127.0.0.1 localhost

You might alter the firewall rules to allow traffic which orginates locally too.

configuring a 32 bit guest under x86_64

echo linux_32bit > /etc/vservers/$NAME/personality

echo i686 > /etc/vservers/$NAME/uts/machine

Changing the mask of the network interface

I had a vserver running perfectly on one host and no access on the network on another.

bonbons on IRC proposed me to put the same mask on the interface in the vserver and the host.

To see your current mask from the host:

root@thehost:/etc/vservers# ip addr list
1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
    link/ether 00:0e:0c:32:e8:92 brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:0c:f1:ad:0f:d8 brd ff:ff:ff:ff:ff:ff
    inet 130.225.64.85/24 brd 130.225.255.255 scope global eth1
    inet 130.225.64.84/32 scope global eth1
    inet6 fe80::20c:f1ff:fead:fd8/64 scope link
       valid_lft forever preferred_lft forever
4: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
    link/ether 00:0c:f1:ad:0f:d9 brd ff:ff:ff:ff:ff:ff
5: sit0: <NOARP> mtu 1480 qdisc noop
    link/sit 0.0.0.0 brd 0.0.0.0

So you can see the mask before changing on eth1: 130.225.64.85/24 and 130.225.64.84/32

To change the mask I created the file: /etc/vservers/my-vserver/interfaces/0/prefix and put 24 in it.

Restart the vserver, enjoy...