Linux - NetworkingThis forum is for any issue related to networks or networking.
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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?
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.
/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.
/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.
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".
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.
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