OpenVZ is an open source containerisation technology for Linux which utilities containers to run separate Linux based operating systems on a single machine. OpenVZ is typically used as it touts a low overhead, of around 1-3% of CPU, compared to virtualization technologies.

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Proxmox vps container connection problems

I have Proxmox on my node server which have ip:5.189.190.* and I created openvz container on an ip : 213.136.87.* and installed centos 6 on it The problem: Cann't connect to container ssh directly ...
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Comparaison between OpenVZ, Xen and KVM on top of Virtualbox

I have to make a comparaison between OpenVZ, Xen and KVM. However I only have a laptop for that and I don't want to install all of them in different partitions. My question is, does it make sense to ...
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MySQL server is unreachable from OpenVZ container

Writing out of despair. Yesterday, as usual and having done this for thousands of times before, I'd installed MySQL server in the Head Node for using it from the OpenVZ container. I've created user, ...
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16 views

Extract files from ploop disk image

I have ploop disk image created by dumping an OpenVZ container. There are two files: 791 DiskDescriptor.xml 2.4G root.hdd Is there any way to extract the whole root file system from there on ...
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25 views

German Umlauts (but only uppercase) are broken

I have a proxmox3 server. I login via SSH. Umlauts (öäüÜÖÄ) works well - nevertheless if upper or lowercase. Then I login in my openvz node (debian wheezy) via: vzctl enter 100 In this node, on ...
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SolusVM Migration

I have an old server on which I am hosting about 30 OpenVZ VPS Servers. I have purchased a new server which is much more powerful and I plan to do a complete migration in the future. Currently I would ...
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128 views

aws s3 sync: how to exclude proc, sys directories

I can't seem to get the aws sync s3 command to exclude directories. I am backing up a mounted filesystem from OpenVZ which is located at /vz/root/100. My command is: aws s3 sync /vz/root/100 ...
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24 views

How to find the missing inodes?

df -i reports Filesystem Inodes IUsed IFree IUse% Mounted on /dev/simfs 300000 250697 49303 84% / so around 250K inodes in use. du -shx --inodes / reports 70K to be sure no inodes was ...
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67 views

Can i do command “service network restart” on dedicated server?

If i do "service network restart" Linux command on my OpenVZ VPS host server (dedicated server where are virtual machines - VPSs hosted), how this can impact virtual machines? Can i loose SSH ...
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728 views

CentOS OpenVZ fail to boot after kernel update

After upgrading to latest OpenVZ kernel CentOS server won't boot. When i try go boot the latest kernel server is stuck at this point: (note that images are taken from virtual kvm) Then i try to ...
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OpenVZ containers will not start after a reboot

vzctl start 192 Dump file /vz/dump/Dump.192 exists, trying to restore from it Restoring container ... Opening delta /vz/private/192/root.hdd/root.hdd Data cluster 1112 beyond EOF, vsec=47137... FATAL ...
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CentOS 7 firewall-cmd not found

I have just installed CentOS 7: [root@new ~]# cat /etc/redhat-release CentOS Linux release 7.1.1503 (Core) I am trying to configure the firewall, and I'm told that in CentOS 7 iptables is no ...
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382 views

can't initialize iptables table `nat' in Proxmox Openvz vm

When I tried to run an iptables command in the Proxmox OpenVZ vm, I got the following error: # iptables -t nat -A POSTROUTING -o venet -j MASQUERADE && iptables-save iptables v1.4.21: can't ...
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OpenVZ MySQL InnoDB won't start

I have a OpenVZ Server with 4GB RAM and have tried to install MySQL on several distros (Ubuntu 12.04 64Bit, Ubuntu 12.10 64Bit, Debian 7 64Bit) and I always get the same errors: 130718 6:57:27 ...
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267 views

LXC containers on a OpenVZ VPS

I am trying to run LXC on a VPN that is hosted in OpenVZ, I have tried doing this with multiple image flavours, ubuntu. centos, debian... with no luck. LXC installs correctly but containers fail to ...
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559 views

SSD caching using bcache or dm-cache on kernel 2.6.32-042stab104.1

I'm looking to use bcache or dm-cache with the latest OpenVZ kernel (2.6.32-042stab104.1) on CentOS 6. Unfortunately, dm-cache and bcache are part of kernel 3.10, but I know the OpenVZ kernel has a ...
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34 views

OpenVZ Container cannot access internet

I have Daedicated Server, and I want to split it on two virtual servers with two diffrent IP Adresses. I bought two exetrnal IP adresses for this server and now I have three, one Main Address, one for ...
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How to login as root in vps from main server (Dedicated)

how to login as root in VPS from root main server without changing the existing root password? I have Dedicated server and use virtualizor OpenVZ for make it available for to build vps, but one of my ...
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13 views

Using DNAT with IPtables

I am trying to figure out a DNAT issue and I am hoping I can get a hand. Basically I have a OpenVZ box that connects to my LAN via the SoftEther Client. What I am trying to accomplish is a way to ...
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48 views

Iptables stuck in D state all the time and causing server load

I am running iptables/csf on a centos 5.11 openvz vps. I can't start/stop/flush iptables/csf. Further looking into it I could see the csf is waiting for iptables. And iptables is stuck as you can see ...
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8 views

configure burst ram for openvz container

Can somebody help me out as to how can we set the burst ram for OpenVZ container using proxmox API. I tried using the following command but with no success: pvesh set /nodes/pve/openvz/{vmid}/config/ ...
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30 views

Cant set extra option to VPS in proxmox 3.4

I am using Proxmox VE 3.4 to create an openvz container...i was able to create a vz container but i want to know are the advanced option like VNC, ppp, tun tap feature available in proxmox VE on any ...
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9k views

OpenVPN server running on openvz. How to write iptables rule without masquerade?

I am configuring a VPS which is running on openvz as an OpenVPN server using a tun interface. I am having some trouble with the iptables rule as MASQUERADE is not available. If MASQUERADE were ...
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35 views

Identical VMs behave differently

I have 2 Centos 6.7 OpenVZ VPS'. I have copied the entire disk image from the first one (server1) to the second one (server2). Now I have a couple of issues with server1 that I don't have with ...
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Openvz: What exactly does it mean when tcpsndbuf failcnt increases? Why must there be a minimum difference between limit and barrier?

When the failcnt of tcpsndbuf increases, what does this mean? Does it mean the system had to go past the barrier, or past the limit? Or, maybe, that the system failed to provide enough buffers, either ...
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45 views

blocked connection to the ts server under OpenVZ

I have virtual machine with Ubuntu 12.04 under OpenVZ. Teamspeak server v. 3.0.11.4 All ok if i connect from LAN or subnet of my provider. But outside traffic blocked. eth1 - LAN interface of ...
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506 views

Debian container unable to start after migration from OpenVZ to LXC on Proxmox 4

After migrating a Debian 7 OpenVZ CT from Proxmox 3 to a LXC on Proxmox 4 it does not appear to start correctly. Fristly, migration was done by stopping the container on Proxmox 3, backing up to ...
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21 views

Why does openvz use Vswap when there is guaranteed memory

And does it really matter? I am hosting through nosupportvpshosting.com and have 2 GB guaranteed memory and 2 GB Vswap. I never get near the 2 GB of guaranteed but often have a small amount of Vswap ...
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71 views

Does updating vzctl and ploop require server reboot?

If we yum update vzctl and ploop on centOS 6, 64-bit, does that require we reboot the server, or stop and start all containers? Just trying to understand if a normal yum update for these two software ...
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Can custom /proc mount options be set on OpenVZ containers?

I recently discovered that the way OpenVZ mounts /proc inside of containers by default isn't as secure as it could be (it's mounted as rw). When combined with insecure scripts on the server, this ...
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How are kernel networking settings handled in OpenVZ containers?

I’m a little confused on how containers handle networking. For our normal systems, we’re enforcing things like Disable Source Routed Packet Acceptance, Disable Send Packet Redirects, etc. We usually ...
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5k views

Stop an unstoppable openvz container

I have an openvz container that is NOT stopping with the standard vz tools. How can I kill it? I tried a VZ destory but that wont work. Thanks
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196 views

GlusterFS can't create volume (error setting extended attributes)

So, I'm running GlusterFS (latest version) on 9 servers, and attempting to create volumes. They're all peers, and all that's okay. They're running in different geographical locations, on different ...
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14 views

tcpsndbuf causing max cpu load (using proxy_mod on openvz)

I do run a web application, which I stripped to the max to avoid a high tcpsndbuf values. Still a failcnt on tcpsndbuf will be reached after a few days and very, very little traffic. I initially ...
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340 views

Pam-Mysql “Can't initialize threads: error 11”

Inside a Debian OpenVZ container, I have 2 OpenVPN servers (udp on port 53 and tcp on port 443). The authentication is based on Pam-Mysql. Inside my OpenVPN conf file I have: [...] plugin ...
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75 views

CentOS host, OpenVZ CentOS container with its own IP cannot access internet

I'm running CentOS 6, and I've got OpenVZ installed (installed with this guide). I'm new to virtualization, and I'm just using these containers for my own projects. I followed all instructions in ...
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557 views

ip6tables rules are completely ignored inside OpenVZ container

We have set up IPv6 networking on openvz using bridged veth devices. The IPv6 traffic to and from the VEs works fine. ip6tables works on the HN and iptables work on the VE. Inside the VE we can set ...
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59 views

ip6tables forward chain filters all ports

Trying the following on a centos 6 node (running openvz kernel) ip6tables -F ip6tables -X ip6tables -P FORWARD DROP ip6tables -A FORWARD -p tcp -m multiport --dports 21,22,80,443 -j ACCEPT ip6tables ...
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51 views

What packages can I update in OpenVZ contained guest?

Recently I bought low cost (1$/m, 256 MiB) VPS based on OpenVZ virtualization. There are pre-built guest Debian 7.0. I like stay with more recent Debian stable release - 8.0. Is it safe to: sed -i ...
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53 views

OpenVZ: Node iptables doesn't append rules

I want to make a set of rules on iptables inside of a node, but it seems that the iptables isn't appending all the rules or somehow and kick me out everytime I run the following script (I'm using this ...
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Determining what type of virtualisation used on VPS/VDS? [duplicate]

I bought VPS/VDS and want to know what virtualization used. I have a root prompt in Debian Linux.
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2k views

Proxmox - backup OpenVZ on NFS

I'm using Proxmox 3.2 with OpenVZ containers and I'm trying to setup a backup system for my 2 nodes cluster. I created a NFS share on a Debian 7.5 server (not under Proxmox, and not inside the ...
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74 views

Can't ssh after configuring sshd_config

I have configured my sshd configuration files to listen to ipv6 addresses, but forgot to uncomment ipv4 local addresses. Here is a snippet from my configuration file: AddressFamily any ListenAddress ...
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Running containers inside a virtual machine?

It is my understanding that containers are much more lightweight than VMs because they do not virtualize the hardware but instead just isolate the software running in them from software running in ...
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23 views

Is it possible to transfer OpenVZ VPS image to XEN platform?

I'm having a memory related issue with my vps on openvz platform and I guess that my hosting provider is overselling RAM. So, I'm thinking to move on a xen platform since ram cannot be oversold but I ...
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IPSec on OpenVZ multiple ip addresses, using 127.0.0.2 on venet0

I have an OpenVZ box with IPSec enabled. root@wa000:~# ipsec verify Checking your system to see if IPsec got installed and started correctly: Version check and ipsec on-path ...
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110 views

OpenVZ Host Node showing up in traceroutes

I've installed SolusVM as a Master server that will host OpenVZ containers on a fresh install of CentOS 6.6 What i am now noticing is that if i traceroute one of my containers IP addresses i see the ...
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190 views

Port Forwarding through OpenVPN to Client on OpenVZ

Edit: Okay I will try to make this more clear. What I am trying to achieve is simply a port forward, through my OpenVZ hosted openvpn server, to a service running on a client. There are a few ...
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Debian limit number of TCP sockets for a process (especially tor) on OpenVZ

I have a debian 7.8 server, running on OpenVZ. On this server I'm running a tor relay and some other network services (like apache and mysql). However the tor service seems to eat up all my available ...
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IP from multi gateway, openvz debian

I have a problem with network in my dedicated server. I have a host: ip 188.60.240.71 netmask 255.255.255.128 gateway 188.60.240.1 broadcast 188.60.240.127 network 188.60.240.0 I order additional ...