APF firewall settings for openvz

1. First of all, you should define which iptables modules are available for VEs.

Edit /etc/sysconfig/iptables-config file on a Virtuozzo hardware node:

IPTABLES_MODULES="ipt_REJECT ipt_tos ipt_TOS ipt_LOG ip_conntrack ipt_limit ipt_multiport iptable_filter iptable_mangle ipt_TCPMSS ipt_tcpmss ipt_ttl ipt_length ipt_state iptable_nat ip_nat_ftp"

Edit /etc/sysconfig/vz file on a Virtuozzo hardware node:

IPTABLES="ipt_REJECT
ipt_tos ipt_TOS ipt_LOG ip_conntrack ipt_limit ipt_multiport iptable_filter iptable_mangle ipt_TCPMSS ipt_tcpmss ipt_ttl ipt_length ipt_state iptable_nat ip_nat_ftp"

Please note - iptables modules list in IPTABLES and IPTABLES_MODULES parameters in /etc/sysconfig/vz and /etc/sysconfig/iptables-config files should be placed in one single line, no linebreaks is allowed in this parameter.

Restart Virtuozzo. All VEs will be restarted.

# service vz restart

2. Increase 'numiptent' parameter for the VE you need to install APF into. This parameter limits the amount of iptables rules available for a VE. Default APF configuration requires ~400 rules. Lets set it to 400 in the example below for VE #101:

# vzctl set 101 --numiptent 400 --save

3. Install APF inside the VE. Edit /etc/apf/conf.apf inside VE, set the following parameters:

IFACE_IN="venet0"
IFACE_OUT="venet0"
SET_MONOKERN="1"

4. Start APF inside the VE:

# /etc/init.d/apf start