You may receive the following message on accessing a VPS from the host server: # vzctl enter 101 enter into VE 101 failed Unable to open pty: No such file or directory The reason behind is the missing tty/pty files OR the udev devices. There are two ways of creating them, using the ‘MAKEDEV’ program [...]
If you receive the error message “vzquota : (error) Quota is running, stop it first” while restarting a VPS, you will first have to turn off it’s quota and then drop it vzquota off VEID vzquota drop VEID Once done, restart the VPS and it will re-initialize the quota for the VPS and will start [...]
By default vSphere does not provide client for Linux or OS X. You need to use Windows system to manage your VMware ESX server. However, it does provides vSphere Web Access which allows you to organize and share virtual machines using web browser. If you try to access vSphere Web Access you may get an [...]
Recently, I noticed that the timeout values differ on CentOS v5.x and RHEL Linux 5.x guests on VMWare ESX4 and ESX3.5. I’ve notices that older ESX 3.5 set a 60 secs timeout and ESX4.x set to 180 secs. Luckly you can fix it easily: Edit /etc/udev/rules.d/99-vmware-scsi-udev.rules, # vi /etc/udev/rules.d/99-vmware-scsi-udev.rules Sample config: RUN+=”/bin/sh -c ‘echo 180 [...]
I’ve already written about setting the MTU (Maximum Transmission Unit) under Linux including Jumbo frames (FreeBSD specific MTU information is here). With this quick tip you can increase MTU size to get a better networking performance. How do I setup MTU under XEN xenbr0 interface? You can easily set MTU under XEN (xenbr0) using ifconfig [...]
Ganeti is a cluster virtualization management system based on Xen. In this tutorial I will explain how to create one virtual Xen machine (called an instance) on a cluster of two physical nodes, and how to manage and failover this instance between the two physical nodes. This document comes without warranty of any kind! I [...]
In my day-job all our Linux boxes (bar 3) are Xen VMs. I wanted a way to take a backup of these with out the risk of the files changing underneath. For performance reasons I am running all of them on Logical Volumes. Within these VMs the DomU OS is once again using LVM for [...]
A. Overview This guide attempts to provide a Xen based test environment where you can practice setting up a two node cluster (cluster setup itself is not discussed here – I’m merely giving you what you need to set it up). XEN can host two type of guest systems para-virtualized and fully-virtualized: for para-virtualized guests [...]
Sometimes it’s necessary to limit traffic bandwidth from and to a container. You can do it using ordinary tc tool. Contents 1 Packet routes 2 Limiting outgoing bandwidth 3 Limiting incoming bandwidth 4 Limiting CT to HN talks 5 Limiting packets per second rate from container 6 An alternate approch using HTB Packet routes First [...]
Our goal is to start the pppd daemon in a virtual machine. Then it is possible, for example, to connect to your DSL provider in a VM. Caveat This feature is experimental. It currently requires a version of vzctl patched with this patch. It is also necessary to run one of these 2 kernels : 2.6.27 [...]
