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Old 04-29-2011, 05:26 AM   #1
mahmoodn
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can't initialize iptables table `filter'


On my diskless cluster, I want to open a port on the image that nodes use it.

Here is what I get:
Code:
root@server:~# chroot /home/nfsroot/
root@server:/# iptables -A INPUT -p tcp -d 0/0 -s 0/0 --dport 4949  -j ACCEPT
iptables v1.4.4: can't initialize iptables table `filter': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
root@server:/# uname -a
Linux server 2.6.32-24-server #39-Ubuntu SMP Wed Jul 28 06:21:40 UTC 2010 x86_64 GNU/Linux
root@server:/#
First I chroot to /home/nfsroot where I installed the ubuntu image for nodes. Any suggestion on that?
 
Old 04-29-2011, 07:00 PM   #2
smallpond
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Quote:
Originally Posted by mahmoodn View Post
On my diskless cluster, I want to open a port on the image that nodes use it.

Here is what I get:
Code:
root@server:~# chroot /home/nfsroot/
root@server:/# iptables -A INPUT -p tcp -d 0/0 -s 0/0 --dport 4949  -j ACCEPT
iptables v1.4.4: can't initialize iptables table `filter': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
root@server:/# uname -a
Linux server 2.6.32-24-server #39-Ubuntu SMP Wed Jul 28 06:21:40 UTC 2010 x86_64 GNU/Linux
root@server:/#
First I chroot to /home/nfsroot where I installed the ubuntu image for nodes. Any suggestion on that?

grep IPTABLES /boot/config-`uname -r`
should print:
Code:
CONFIG_IP_NF_IPTABLES=y
If it is m, then you need to load the iptables module.
Do lsmod to see what's loaded.
 
Old 04-30-2011, 12:00 AM   #3
mahmoodn
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Code:
mahmood@orca:~$ grep IPTABLES /boot/config-`uname -r`
CONFIG_IP_NF_IPTABLES=m
CONFIG_IP6_NF_IPTABLES=m
using lsmod, there is no iptables module. What should I do next?
 
Old 04-30-2011, 12:29 AM   #4
smallpond
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[QUOTE=mahmoodn;4341571]
Code:
CONFIG_IP_NF_IPTABLES=m
"m" means it is compiled as a module, not compiled into the kernel.
To load try:

service iptables restart

If that doesn't work you can load the modules manually:

modprobe iptables
modprobe iptable_filter

Not sure of the exact names. They are in the /lib/modules/*/kernel/net/ subdirectory for your kernel.
 
Old 04-30-2011, 12:36 AM   #5
mahmoodn
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/lib/modules is empty. That means there is no kernel installed for the nodes!!
It is strange because the client can boot from that image and I can see the login prompt and then login.
 
Old 04-30-2011, 01:02 AM   #6
smallpond
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Quote:
Originally Posted by mahmoodn View Post
/lib/modules is empty. That means there is no kernel installed for the nodes!!
It is strange because the client can boot from that image and I can see the login prompt and then login.
The kernel itself is in /boot. But your install is broken if you don't have the modules.
 
Old 04-30-2011, 01:06 AM   #7
mahmoodn
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/boot is also empty !!
I have installed the boot image using
Code:
 debootstrap --arch amd64 lucid /home/nfsroot/ http://archive.ubuntu.com/ubuntu/
/home/nfsroot is shared with nfs. I used this guide https://wiki.edubuntu.org/EasyUbuntu...edClusterGuide

When I say /boot and /lib/modules are empty I mean /home/nfsroot/boot and /home/nfsroot/lib/modules are empty. I am not talking about the server node
 
Old 04-30-2011, 01:24 AM   #8
smallpond
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Quote:
Originally Posted by mahmoodn View Post
/boot is also empty !!
I have installed the boot image using
Code:
 debootstrap --arch amd64 lucid /home/nfsroot/ http://archive.ubuntu.com/ubuntu/
/home/nfsroot is shared with nfs. I used this guide https://wiki.edubuntu.org/EasyUbuntu...edClusterGuide

When I say /boot and /lib/modules are empty I mean /home/nfsroot/boot and /home/nfsroot/lib/modules are empty. I am not talking about the server node
Cool! OK - it loaded the kernel using tftp from your server. It looks like it also has loads a filesystem from the server with the rest of the OS. This is probably where your modules need to be. Either that or recompile the kernel with "y" instead of "m".
 
Old 04-30-2011, 01:38 AM   #9
mahmoodn
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What should I do exaclty?
 
Old 04-30-2011, 12:14 PM   #10
smallpond
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Quote:
Originally Posted by mahmoodn View Post
What should I do exaclty?
Based on the documentation I'd guess that your NFS share should have the modules in it. After the kernel is booted via PXE, it should NFS mount the rest. See what's mounted and why the modules are not in the mounted directories on the root node.

The documentation is long on building the kernel and short on setting up the rest of the system.
 
Old 04-30-2011, 12:19 PM   #11
mahmoodn
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I am not using Kerrighed. I used that document to setup a diskless cluster.
 
  


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