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Questions tagged [openvz]

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.

OpenVZ is an open source operating system-level containerisation which integrates with the Linux Kernel. Because of this OpenVZ can only run on Linux and can only run Linux containers which have compatible kernels. OpenVZ separates out virtual environments into "containers", which are similar to BSD Jails.

OpenVZ is not like traditional hyper-visor based virtualization technologies, such as Xen or VMware, in that is only runs a single patched Linux Kernel. This however lets OpenVZ be faster and more efficient than hyper-visor based technologies. Typically each OpenVZ container will have around 1-3% overhead of that if it were a physical machine.

OpenVZ is the basis of Virtuozzo Containers, which is commercial software distributed by Parallels Inc. OpenVZ is available under the GNU GPL v2 license.

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Ghost user in debian?

I have an openvz vps with debian, I am new to linux and the command line environment although i can setup a webserver. I have just noticed that there is a ghost user because when i execute /usr/bin/w it shows that there are two users logged…
juan
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Why is a remote IP redirecting to a local server?

I've got a rack full of Linux servers that host OpenVZ containers and for some reason when I attempt to connect to a certain remote IP from inside a few of the OpenVZ containers (using telnet, for example), I end up connecting to another server on…
Curtis
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How can I install only the proxmox kernel on Debian on Wheezy

I'm going to run two servers with OpenVZ on Wheezy. Since there are sadly no OpenVZ kernels in debian anymore I want to use the Proxmox kernel instead. I'm doing all replication with scripts I have already in place. What I don't want is all the pve…
Scheintod
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Linux: File is not shown in ls but cannot be touched with message "File exists"

I can remember creating this file but it disapeard. But not completely: root@XXX:/etc/vz/conf# ls -al total 0 drwxr-x--- 2 root www-data 0 Okt 1 16:04 . drwxr-x--- 2 root www-data 0 Okt 1 16:04 .. root@XXX:/etc/vz/conf# touch 1030.conf touch:…
Scheintod
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Why would you use Xen as opposed to OpenVZ for trusted Linux-only host/guests?

Every time I need to create VPSs out of one of our machines, I (re)think the virtualization technologies, and seem to end up with OpenVZ being the most suitable for performance reasons when all I want is clean separation between VPSs. All running…
Amr Mostafa
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Two IPs - One OpenVPN instance, impossible?

I have a debian 64bit vps, OpenVZ, with perfectly working openvpn server. I have ADDITIONAL IP which I want to use on that same openvpn server and I can't make it work. It only works if I specify "local ADDITIONAL-IP" directive in openvpn.conf, but…
user2489483
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Can you make the /vz directory a symlink?

I have a OpenVZ VPS server with a 500GB hard drive and 240GB SSD. I'd like to have each VM's files stored on the SSD. Can I make their directory within /vz symlink to a directory on the SSD? There might be a better way to do this. If you know one,…
user1710563
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How to increase Free PE in LVM physical volume?

I use Proxmox 2.2 for making OpenVZ containers. It ships with a tool called vzdump that can create backups of OpenVZ containers on the fly. It uses snapshot functionality of LVM to create temporary "fork" of filesystem for backup…
mspanc
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CentOS OpenVZ kernel panic when mounting ext4 truecrypt volume in nokernelcrypto mode

I am experiencing kernel panic when trying to mount a ext4 filesystem which itself resides on a truecrypt volume mounted using -m nokernelcrypto option. The system is CentOS 6.3, OpenVZ Kernel 2.6.32-042stab074.10 The disk is a virtual disk (a…
Anton
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Identifying performance bottleneck on a high-end VPS (Apache 2.4 event_mpm/lighttpd/nginx)

I have quite a high-end VPS from vpsblast (their SSD13) - 4 cores, 16gb RAM, 320gb of SSD hard drive space on a 1GigE Internet backbone (virtually uncontested). As near as I can tell it is running OpenVZ (simfs is used, user_beancounters exists).…
fluffyponyza
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Can't lock vz with proxmox

I would like to backup my virtual servers to move them away. And when i have started the backup process then i only see this every time: Feb 09 08:40:34 INFO: Starting Backup of VM 101 (openvz) Feb 09 08:40:34 INFO: CTID 101 exist mounted…
rsz
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PPTP installation on CentOS 5 not working (Kernel support for PPP?)

I am trying to get PPTP installation up and running on my VPS. I have followed various guides, however, I am unable to connect to the VPN once it’s setup. I checked my VPS’ /var/log/messages and I found this: 1832 Dec 2 23:38:55 server9987…
Oliver Joseph Ash
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how to drop_caches in OpenVZ centos6 container

I have tried sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches' sudo echo 3 > /proc/sys/vm/drop_caches echo 3 > /proc/sys/vm/drop_caches echo 3 | sudo tee /proc/sys/vm/drop_caches and a bunch of other variations but with every try I get bash:…
DiverseAndRemote.com
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CentOS 6.3 Virtual under OpenVZ cannot ping, host lookups, outbound connections while postfix running

My best theory is that some kernel limit is being hit preventing outbound connections. We have tried basically everything from tcpdumps to provisioning an entirely new virtual server (we do not have this problem on any other virtuals), however the…
Paul Cravey
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Allowing outbound traffic with APF/iptables for OpenVZ container

I have apf installed on a OpenVZ container (proxmox 2.1). The config is pretty much vanilla and things are working. My external services like ssh and http are working. My problem is that all outbound traffic on http/https is blocked. How do I…
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