OpenVZ is an open source virtualization 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 other virtualization technologies.

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openvpn connects and can ping outside internet but no tcp or udp connections

I have configured an openvpn setup with the server virtualized using openvz. The client connects correctly. I can ping the server from the client and vice versa. ssh to the client also works after the ...
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13 views

OpenVZ Local Network

I recently aquired 7 OpenVZ Virtual Private Servers for a load balanced website. 2 Load Balancers 3 Web Servers + MySQL API Server + MySQL Storage Server 2 Storage Servers (For PHP Sessions and ...
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OpenVZ containers can not ping out [closed]

I have a server on OpenVZ. While I have gotten networking issues in the past, this I have not cracked yet. The server has the following symptoms. No container can ping out Containers can ping each ...
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19 views

OpenVZ: Is it possible to add a new ploop disk to an existing container residing on an OpenVZ host?

I have a container (Virtual Machine) running on an OpenVZ server and I would like to attach another ploop disk to this container. The / mount point of the container is already configured as ploop ...
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1answer
25 views

OpenVZ Web panel: no such file to load when add physical server

I'm trying to use on my (testing) lxc server. I've on my server "potager.local": root@potager:~# lxc-list RUNNING FROZEN STOPPED web I've installed OpenVZ Web Panel on it and it ...
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3answers
359 views

Error installing new OpenVZ kernel

Seem to have an error when updating the kernel on a OpenVZ server when running "yum update" im getting the below Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: ...
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1answer
79 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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76 views

Connection tracking not working in a Debian 7 OpenVZ VPS

I have a small VPS instance (used for web hosting) that runs Debian 7, and for a few weeks I have issues with my firewall and connection tracking. I had no issue for months, but without any system ...
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1answer
55 views

Requirements to move an LXC container from host to another

What are the requirements and things to know to move an LXC container from an host to an other ?
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86 views

Taskset not working properly in OpenVZ container

In a Debian OpenVZ container, I'm trying to use taskset to pin a process to a core, but it doesn't work: root@foo:/# taskset -c -p 0 1754 pid 1754's current affinity list: 0-7 pid 1754's new affinity ...
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2answers
37 views

How to avoid loop limitation in a openvz container?

On a openVZ containing Deb7 I need to lock the maximum size of a folder, which is used to upload on a php based web server. The directory is synced, so I have to lock the maxsize. MAXSIZE should be ...
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61 views

VPS without access to the Internet after reboot

There is a problem with my VPS. I had purged lots of programs using apt-get command and * wildcard among other things to remove many apps at the same time such as sendmail-*. After it the server ...
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2answers
162 views

Best type of virtualization when CPU has more threads than cores

I have a 4 cores/8 threads Intel Xeon processor. This is something I tried to particularly ask in SolusVM support, however I haven't got a good reply. I even don't know if they are right: they told me ...
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1answer
23 views

Bonnie does not provide speed for Sequential Input / Block

I'm using ProxmoxVE and I would like to run some benchmarks regarding performances of this product. One of these benchmarks is bonnie++ ; it runs very well in a VM (qemu-kvm) but when I run it in a ...
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2answers
38 views

Problems with pid files when restoring OpenVZ snapshot

I am trying different ways to take snapshots of running openvz containers. Following this guide : http://openvz.org/Checkpointing_and_live_migration, I always encounter an issue with pid files ...
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1answer
51 views

No remote access to VPS container based on OpenVZ

Is there any chance to start ssh server when sysinit is turned to DEFAULT_RUNLEVEL=1? I have no remote access at the moment to my VPS server (based on OpenVZ container), but I can edit files and ...
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3answers
2k views

iptables nat does not exist

Today my iptables nat on the host system stopped working and I have no clue what happend! (That's very bad, I know) All commands are executed as root user. If I run $ iptables -t nat -L I get the ...
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56 views

SSH chroot solution for Mutt

We have an environment tailored for our users to log in via ssh and instead of gaining access directly to a shell, users have a script in place of a shell. The script simply launches Mutt on the ...
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1answer
48 views

yum update MemoryError 1G memory free

I am trying to do yum update and getting "MemoryError". The server (OpenVZ box) has 2G RAM and Percona MySQL server running with 1G InnoDB buffer configured. The OS is CentOS 6.5, kernel ...
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1answer
41 views

Unable to get OpenVPN working on Ubuntu on an OpenVZ VPS

I have TUN/TAP enabled server.conf port 1194 proto udp dev tun ca ca.crt cert server.crt key server.key dh dh1024.pem server 10.8.0.0 255.255.255.0 ifconfig-pool-persist ipp.txt push ...
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1answer
85 views

Why does installing vzctl on a fresh Centos6.5-minimal break network connectivity?

I seem to have encountered a bug in vzctl's installation. Upon installing it in a clean CentOS6.5-minimal installation according to the official wiki, network connectivity is limited to pinging IP ...
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1answer
38 views

Logging connections on a port of a openvz container by iptables

I'm trying to log the connections that are made on the container with the IP x.x.x.x I'm sending an email using postfix by the mail command but I don't see any logs. Here is my configuration: ...
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29 views

openvz tar implausibly old time stamp

I'm trying to restore a 26 G tar dumpo of an openvz container. The problem is, that when untarring this error comes up: implausibly old time stamp 1969-12-31 18:00:00 and the it doesn't finish the ...
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884 views

“Warning: hostname localhost does not resolve to address ::1: No address associated with hostname” inside an openVZ/Debian container

I'm getting the mesage regulary inside mail.log from postfix. In special, but not only, at mails send received mailman. warning: hostname localhost does not resolve to address ::1: No address ...
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42 views

how much openvz burstable memory can be used

I want to buy a VPS having openvz virtualization. Now the applications that i m currently hosting( glassfish, mysql, mail) requires around 600~800 MB of RAM. Would I be able to run my applications ...
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117 views

Modifications to sysctl.conf in openVZ container, do they even take effect?

I'm following a security guide(http://www.thefanclub.co.za/how-to/how-secure-ubuntu-1204-lts-server-part-1-basics) to strengthen my OpenVZ based VPS webserver running Ubuntu 12.04 , a part of that ...
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1answer
370 views

“kernel: Cannot read proc file system: 1 - Operation not permitted” — millions of such messages each minute in kern.log on OpenVZ VPS? [closed]

I'm seeing repeated never ending such messages in kern.log on my OpenVZ ubuntu 12.04 server. Mar 2 06:23:33 localhost kernel: Cannot read proc file system: 1 - Operation not permitted. Mar 2 ...
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3answers
91 views

Should I get extra IPs?

This is my proposed setup using OpenVZ containers (hosted on Proxmox): CT 1: MySQL and nginx. Hosts all databases and multiple websites(domains). Used ports are 80, 443, 3306, 8080 CT 2, 3, 4: These ...
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21 views

Automated hostname availability for OpenVZ environments

for several years now I am administrating some OpenVZ Hardwarenodes with a fairly low amount of containers per node (10-20). I'm about to setup a new machine, and what's always bothering me is the ...
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1answer
49 views

No buffers in memory. What it means?

This is a memory stats from my VPS (OpenVZ). $ free -m total used free shared buffers cached Mem: 800 405 394 0 0 405 -/+ ...
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4answers
235 views

Heavy production MySQL/Percona Database in openvz container

So I'm currently running a MySQL 5.1 database, with the following specs: Proc: Intel(R) Xeon(R) CPU E5-1620 0 @ 3.60GHz RAM: 64 Go disks: 2x 100 Go SSD (RaidSoft) I'm planning to migrate my ...
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64 views

How to diagnose sporadic performance issues?

I have a web application with very varying response times and can't find out what causes that. That's the (quite complicated) setup: Powerful (i7, 32GB RAM) dedicated server in a German data center, ...
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81 views

Can't run CSF on the host machine using Open VZ

I managed to configure CSF on my three VM inside OpenVZ, but when I try to run it on the host, all the VMs become unreachable. I can see that the host is been attacked, and it would be critical if it ...
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22 views

Would using containers be appropriate for a virtual lab?

So far i have been running a VM lab using virtual box, however functionally i cant see a difference between using virtualbox and a container based virtualization application, such as lxc. This is ...
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18 views

Certificate issues at OpenVZ Ubuntu containers

today I came up with the problem that certificates cannot be verified on my openvz ubuntu containers. I checked the /etc/ssl/certs folder which is readable and seems to be ok. However, when I try to ...
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80 views

Difference between OpenVZ and Parallels Virtuozzo Containers OS templates and the way how CentOS and Debian starts inside the container

I have an Parallels Virtuozzo Containers VPS with CentOS 5 OS template. I can't change the template trough the PVC Power Panel nor by asking my provider to do that. He told me that the image is the ...
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3answers
82 views

Remote access forbidden (HY000) to specific mysql client

A MySQL server is located at central.hwcharts.com; it is the master of a basic master-slave replication which replicates toward host0.hwcharts.com, located on a different physical machine which ...
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1answer
284 views

Why is OpenVZ less secure than KVM and XEN [closed]

I've read many forums and blogs and articles comparing OpenVZ, KVM and XEN. And I have seen many times that one of the negatives of OpenVZ is that its less secure. However, I have yet to see an ...
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53 views

Memory usage reported incorrectly on OpenVZ VPS [duplicate]

I have a VPS with a service that uses OpenVZ. My memory usage regularly rises to the maximum of 2GB. There is only one thing the VPS is being used for - a reverse SSH tunnel. When the memory usage ...
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2answers
45 views

How does vzdump treats hard links pointing out of the virtual machine?

I have an OpenVZ container containing some hard links pointing to the host file system. For example, I have run on the host ln /root/file /var/lib/vz/private/101/root/link Now I'm asking myself: if ...
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174 views

Using ufw on OpenVZ-based VPSes

I'm facing with a problem to set up ufw on Ubuntu 12.04 running on an OpenVZ-based VPS. I know there is limitations for ufw. I googled a bunch of articles how to resolve the issue (like: ...
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56 views

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 ...
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30 views

tmpfs is getting unmounted somehow

I have reinstalled Ubuntu 12.04 onto my OpenVZ VPS. I downloaded the teamspeak server and installed it via the instructions here. I added the line to /etc/fstab: tmpfs /dev/shm tmpfs defaults ...
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1answer
65 views

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 ...
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46 views

SolusVM Ubuntu 13.10 OpenVZ networking issue/bug

I currently have a server running SolusVM and using OpenVZ virtualization. I downloaded the new Ubuntu 13.10 from their official repo http://openvz.org/Download/template/precreated and installed it on ...
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48 views

Containers running on ARM

I've been doing some research and decided to implement OpenVZ since it allows each container to be isolated from other containers, unlike LXC. However, OpenVZ is still not supported for ARM ...
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1answer
45 views

OpenVZ sharing PHP5-FPM socket

I need a problem with sharing php5-fpm.sock between 2 vz containers I have 2 containers: 1. with NGINX 2. with PHP5 and PHP5-FPM Link containers over NFS I tried using: 1. mount --bind ...
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1answer
92 views

openvz / centos 6 vps yum failing with error

Installed new openvz container with centos 6.4 64bit Resolving Dependencies --> Running transaction check ---> Package kernel.x86_64 0:2.6.32-431.el6 will be installed --> Processing ...
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3answers
217 views

OpenVPN forwarding keeps redirecting me to server itself (with openVZ)

I'm trying to configure a VPN on a new virtual server, powered with OpenVZ. I took the configuration of my current VPN, which is hosted on a Xen VPS and pasted it on my new server. After many tries, I ...
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1answer
70 views

OpenVZ vSwap Host Configuration

I wish to allocate vSwap memory to my OpenVZ containers. Where does OpenVz get the vSwap memory from? If the host were to run out of physical RAM, would the host start to use its own normal swap ...