OpenVZ 7 (virtuozzo 7) Enable netfilter as standard
Written by Anthony Smith, 1 Aug 2020
Article was migrated from WordPress to Vanilla in March 2022
This quick tips post is aimed at hosts that use SolusVM and OpenVZ 7 or Virtuozzo 7.
I have probably had to answer this question around 30 times now so I thought I would make a quick blog post about it so it can be referred too by those that need it.
To build container config files solsuvm uses the file: /etc/vz/conf/ve-vswap-solus.conf-sample
The standard looks like this:
# Copyright (C) 2000-2011, Parallels, Inc. All rights reserved. # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA # # This config is valid for VSwap-enabled kernel (which currently means # any RHEL6-based kernel, i.e. 042test* or 042stab*). ONBOOT="yes" # UBC parameters (in form of barrier:limit) PHYSPAGES="0:512M" SWAPPAGES="0:1G" KMEMSIZE="233M:256M" LOCKEDPAGES="256M" PRIVVMPAGES="unlimited" SHMPAGES="unlimited" NUMPROC="unlimited" VMGUARPAGES="0:unlimited" OOMGUARPAGES="0:unlimited" NUMTCPSOCK="unlimited" NUMFLOCK="unlimited" NUMPTY="unlimited" NUMSIGINFO="unlimited" TCPSNDBUF="unlimited" TCPRCVBUF="unlimited" OTHERSOCKBUF="unlimited" DGRAMRCVBUF="unlimited" NUMOTHERSOCK="unlimited" DCACHESIZE="unlimited" NUMFILE="unlimited" NUMIPTENT="unlimited" # Disk quota parameters (in form of softlimit:hardlimit) DISKSPACE="50G:50G" DISKINODES="131072:144179" QUOTATIME="0" # CPU fair scheduler parameter CPUUNITS="1000"
For end-user containers to get full netfilter access which in simple terms allows many iptables functions and VPNs to start working within containers NETFILTER="full" needs to be added to the containers config file and the container restarted.
To save that hassle simply add the following at the end of: /etc/vz/conf/ve-vswap-solus.conf-sample
#Netfilter NETFILTER="full"
That way they will get it as standard without any host intervention required, saving hassle for everyone and reducing tickets.
Users may report errors such as:
Error: iptables: No chain/target/match by that name
or
Error: iptables v1.4.21: can't initialize iptables table `nat
Not having netfilter=full in the container config is usually the cause, if you are a VPS user reading this and have found the errors above point your host to this article.