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#1 21 Nov 2009 11:05:35 am

ramnet
Moderator
From: USA
Registered: 15 Nov 2009
Posts: 582
Website

Programs That Don't Work Inside Your VPS

Note: this only applies to our OpenVZ VPS platform. You can use any software you want on our KVM VPS's without issue.

This is a list of programs that, for one reason or another, simply will not work inside your virtual dedicated server. Some programs will fail silently, while others will enter an infinite loop (we'll kill programs on this list that do that).

NTPD - Network Time Protocol Daemon

Running this inside your VPS serves no purpose since you cannot change the time in your VPS (you can change the timezone, but not the actual time itself).

Also, there is no need to run this on your VPS as we run this on the host hardware which keeps all the VPS clocks accurate.

PPTPD - Point-To-Point Tunnel Daemon

This will not work as we cannot support a virtual ppp kernel module.

If you want to run VPN software you should use OpenVPN instead.

IPSec / PPTP / L2TP (poptop / openswan)
Any program that requires this feature of the kernel / network stack will not work. Typically used by tunneling programs that manipulate the network at a low level.

We only support higher level tunnels (eg: those that run in userland as opposed to kernal-based tunnels that require specialized modules) such as OpenVPN or SSH tunnels.

UFW - Uncomplicated Firewall

Needs unsupported sysctl.conf tweaks - Use APF (advanced personal firewall - SET_MONOKERN="1"), CSF (ConfigServer Firewall), or just edit iptables directly.

iptraf / iftop - Network Traffic Statistics

Unable to see traffic going over venet0 - essentially worthless (except for lo traffic) - use netstat, ifconfig, "cat /proc/net/dev",etc.

resolvconf

This is a utility that updates /etc/resolv.conf based on DHCP. There is absolutely no reason to install this (it will do nothing except break DNS resolution).

OpenVPN AS (Access Server)

Due to requiring certain kernel features this variant of OpenVPN won't work. You will need to use the standard OpenVPN software instead (see here or here for tutorials).

MRTG

Due to the way MRTG pools the network interface inside your vps it doesn't work. We would suggest using Munin instead.

TCPDUMP

TCPDUMP will not reliably work due to an issue with Linux 2.6.26.

64 bit versions may have better results than 32 bit versions.

certain iptables features
Such as: logging and generic network masqurade'ing.

----

We will add to this list as we discover more things that don't work (please let us know if you find anything else).


Alex, RAM Host

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#2 22 Nov 2009 10:55:15 pm

ksx4system
Member
From: Poland, Europe
Registered: 19 Nov 2009
Posts: 29
Website

Re: Programs That Don't Work Inside Your VPS

iftop - it views 0 traffic even with few mbit/s uplink and downlink sad


Happy ramhost.us VPS user since September 2009 :-)

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#3 23 Nov 2009 4:22:50 am

FABMak
Member
Registered: 20 Nov 2009
Posts: 13

Re: Programs That Don't Work Inside Your VPS

ufw - Uncomplicated Firewall (Ubuntu) don't work well as it try some sysctl tweaks.

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#4 23 Nov 2009 4:27:52 am

ramnet
Moderator
From: USA
Registered: 15 Nov 2009
Posts: 582
Website

Re: Programs That Don't Work Inside Your VPS

thanks - added to the list.


Alex, RAM Host

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#5 01 Dec 2009 1:03:50 am

jimhsu
Member
Registered: 01 Dec 2009
Posts: 3

Re: Programs That Don't Work Inside Your VPS

I found out the hard way that anything that expects display:0 (programs that launch things in xterm, etc) will not work. If you really must have remote GUIs, install something like a VNC solution.

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#6 16 May 2010 6:14:20 am

FABMak
Member
Registered: 20 Nov 2009
Posts: 13

Re: Programs That Don't Work Inside Your VPS

The Ubuntu's guys found a workaround to run UFW inside OpenVZ:
http://blog.bodhizazen.net/?p=1331

Last edited by FABMak (16 May 2010 6:14:45 am)

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#7 18 Jun 2010 12:15:48 pm

moudsen
Member
From: The Hague, The Netherlands
Registered: 27 Dec 2009
Posts: 10
Website

Re: Programs That Don't Work Inside Your VPS

I can confirm that on OpenSUSE the firewall (applicative and networking) just works fine ... ;-))

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#8 07 Sep 2011 11:10:23 am

sheedatali
Member
Registered: 10 Feb 2010
Posts: 15

Re: Programs That Don't Work Inside Your VPS

That means pretty much that Android clients can't connect to VPS, since android does not support OpenVPN and you won't support pptpd and openswan.

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#9 07 Sep 2011 11:48:37 am

admin
Administrator
Registered: 15 Nov 2009
Posts: 380
Website

Re: Programs That Don't Work Inside Your VPS

This thread is getting old now.

In case it wasn't clear, none of these restrictions apply to our KVM VPS  they can run anything.


Robert, Owner, RAM Host

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#10 08 Sep 2011 5:34:36 am

sheedatali
Member
Registered: 10 Feb 2010
Posts: 15

Re: Programs That Don't Work Inside Your VPS

Ok that is encouraging to hear. How do I check if am KVM or OpenVZ ? and if I am not on KVM then what do I need to do to switch to KVM as it sounds closer to my requirements.

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#11 08 Sep 2011 10:16:46 am

admin
Administrator
Registered: 15 Nov 2009
Posts: 380
Website

Re: Programs That Don't Work Inside Your VPS

At the moment we only offer KVM plans in our UK location, although Kansas and LA will have KVM plans within the next few weeks.

You check which technology your vps is on by simply running "ifconfig" - if your network interface is named venet0 you are on openvz, if it is named eth0 you are on kvm.

Direct migration between the technologies on our part is impossible - If you want to switch between technologies you will have to order a new VPS and move everything yourself.

KVM plans are also priced (or will be priced when they launch) at a slightly higher rate than their openvz equivalents.


Robert, Owner, RAM Host

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#12 30 Apr 2015 5:55:10 am

sosad
Member
Registered: 30 Apr 2015
Posts: 1

Re: Programs That Don't Work Inside Your VPS

I can confirm that on OpenSUSE the firewall (applicative and networking) just works fine ... ;-))


GuL

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