csf + lfd firewall configuration in vps (virtuozzo /openvz)

Introduction:

In general csf is giving good compatibility with cpanel servers . But in a vps (openvz or Virtuzzo) the csf configuration is something different.

Sometimes you may get an error as follow after the csf installation in vps

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Error: iptables command [/sbin/iptables -v -A LOGDROPIN -p tcp -m limit --limit 30/m --limit-burst 5 -j LOG --log-prefix 'Firewall: *TCP_IN Blocked* '] failed, at line 196

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So how to resolve this issue. Let us do it as follows,

There are two steps to configure the csf in vps

i)Main vps server ( The host server ,in which the vps nodes are running) configuration

ii) Vps node configuration.

Main vps serverconfiguration

Before starting the csf installation in a node login to the main server (host server) and check whether the following modules are inserted in to the kernel

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ipt_conntrack
ipt_LOG
ipt_owner
ipt_state
ip_conntrack_ftp
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You can check it as follows

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# lsmod |grep -i <module-name>
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If not please insert these modules into the kernel.

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#modprob <module-name>
eg: modprob ipt_conntrack
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Now add these modules to iptable configuration as follows.

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# vi /etc/sysconfig/iptables-config
Add the following in this file
IPTABLES_MODULES=”ipt_conntrack ipt_LOG ipt_owner ipt_state ip_conntrack_ftp”
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Now edit the vps configuration file from /etc/sysconfig/vz-scripts/ Let 101 is the VEID, add the above inserted modules in to the IPTABLE section in this configuration file.

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# vi /etc/sysconfig/vz-scripts/101.conf
IPTABLES=”iptable_filter iptable_mangle ipt_limit ipt_multiport ipt_tos ipt_TOS ipt_REJECT ipt_TCPMSS ipt_tcpmss ipt_ttl ipt_LOG ipt_length ip_conntrack ipt_state
iptable_nat ip_nat_ftp ipt_owner ip_conntrack_ftp”
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Here we completed the main vps server configuration . So now reboot the child node (not main server) as follows

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# vzctl restart <veid>

eg: vzctl restart 101

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ii) Vps node configuration.

Now ssh /enter your child vps node

Now download and install the csf . You can download the csf fromhere

Before restarting the csf let us do some configurations as follows , Edit the file /etc/csf/csf.conf .Then set the following variables

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ETH_DEVICE = “venet0″ #from ifconfig you can see the n/w device
MONOLITHIC_KERNEL = “1″
VERBOSE = “0″ # will disable the verbose output during start
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Now start the csf and lfd .

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/etc/init.d/csf start

/etc/init.d/lfd start

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Note: If it is cpanel server go to whm and configure the firewall settings

By: http://syslint.com/syslint/csf-lfd-firewall-configuration-in-vps-virtuozzo-openvz/