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APF on CentOS-5 OpenVZ Containers

Submitted by sandip on Tue, 06/24/2008 - 12:00
  1. Increase the NUMIPTENT values in VE conf file to 1000 on the host:
    NUMIPTENT="1000:1000"
  2. Edit "/etc/sysconfig/vz" on the host:
    IPTABLES="ipt_REJECT ipt_tos ipt_TOS ipt_LOG ip_conntrack ip_conntrack_ftp ip_conntrack_irc ipt_owner ipt_length ipt_limit ipt_multiport iptable_filter iptable_mangle ipt_TCPMSS ipt_tcpmss ipt_ttl ipt_length ipt_state iptable_nat ip_nat_ftp ipt_recent"
  3. Make sure the above modules are loaded on the host, so it would help if you have APF on the host as well.
  4. Restart the VE
    # vzctl restart <VEID>
  5. It is normal to get ipt_recent error as below:
    Warning: Unknown iptable module: ipt_recent, skipped

    You can verify the modules loaded via:

    # vzctl exec <VEID> grep ipt_recent /proc/net/ip_tables_matches

    Note: ipt_recent is required for passive ftp to work, else... will need to specify passive ftp ports in ftp conf file and open those ports via apf as well.

  6. Here is a typical apf config on a VE with CentOS-5 running ISPConfig.

    DEVEL_MODE="0"
    IFACE_IN="venet0"
    IFACE_OUT="venet0"
    IFACE_TRUSTED=""
    SET_MONOKERN="1"
    IG_TCP_CPORTS="21,22,25,53,80,81,110,143,443"
    IG_UDP_CPORTS="53"
    EGF="1"
    EG_TCP_CPORTS="21,25,80,443,43"
    EG_UDP_CPORTS="20,21,53"

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