Error will be shown in your virtual machine when it is not matched, such as in your iptables, e.g.:
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# iptables -L
iptables v1.3.5: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
To resolve the issue and install the missed kernel modules please follow the instructions:
1. Check your VPS domU kernel version:
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# uname -a
Linux vps1.likg.org.ua 2.6.18-194.17.4.el5xen #1 SMP Mon Oct 25 16:36:31 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
2. Download kernel module which match your kernel version into your VPS:
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mkdir /usr/src/kernel_modules
wget "http://mirror.centos.org/centos/5/updates/x86_64/RPMS/kernel-xen-devel-2.6.18-194.17.4.el5.x86_64.rpm"
3. Unpack the RPM file:
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rpm2cpio kernel-xen-devel-2.6.18-194.17.4.el5.x86_64.rpm| cpio -idmv
4. Move the kernel modules to /lib/modules/ directory:
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mv lib/modules/2.6.18-194.17.4.el5xen /lib/modules/
rm -rf /usr/src/kernel_modules
5. Load the required modules:
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depmod -a
Now you can check it with iptables -L again:
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# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
6. It is recommended to reboot the VPS for test purpose:
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shutdown -r now
Presumably, it`s possible just to use "yum install kernel-xen.x86_64", but haven`t tested by me.
