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The issue is modprobe and iptables don't work inside an LXC Container.

LXC is the userspace control package for Linux Containers, a lightweight virtual system mechanism sometimes described as “chroot on steroids”.

iptables error inside the container is:

# iptables -I INPUT -s 122.129.126.194 -j DROP
> iptables v1.4.8: can't initialize iptables table `filter': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.

I am guessing that it can't work because the LXC containers share one kernel, the main server kernel.

How do I do fail2ban in this case. modprobe and iptables work in the main server so I could install it there and link to the logfiles somehow, my guess?

Any suggestions?

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Have you loaded the Iptables modules? It can be that you need to do this manually. –  Lucas Kauffman Jun 12 '12 at 22:57
    
As long as modprobe doesn't work there is no point of trouble shooting iptables or fail2ban. The real question is, is it even safe to do modeprobe from chroot? –  RoboTamer Jun 12 '12 at 23:14
    
It ought to work. I'd try manually loading the modules on the host. blog.bodhizazen.net/linux/lxc-configure-ubuntu-lucid-containers says just copy the modules into the container filesystem. –  DerfK Jun 13 '12 at 1:48

1 Answer 1

up vote 3 down vote accepted

Maybe tcp wrappers works for you. fail2ban can manage /etc/hosts.allow and /etc/hosts.deny files

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Right, iptables don't work, still don't get the 5 bans –  RoboTamer Jul 31 '12 at 23:13

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