Virtualization

PPP in container

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 […]

Vmware Linux Guest Add a New Hard Disk Without Rebooting Guest

As a system admin, I need to use additional hard drives for to provide more storage space or to separate system data from user data. This procedure, adding physical block devices to virtualized guests, describes how to add a hard drive on the host to a virtualized guest using VMWare […]

Yum update. Error: rpmdb open failed

The “rpmdb open failed” error message is mostly received when the rpm databases __db.00* located under /var/lib/rpm directory are corrupted. This results in a “error: cannot open Packages database” message while installation/updatation of a package via yum. root@server [~]# yum update Loaded plugins: fastestmirror error: no dbpath has been set […]

Bridge Networking On OpenVZ Containers Using VETH Devices

1. Host will be open on LAN and guests on WAN. Additionally, there is a bridged LAN for guests. 2. We will be using bridge networking for protecting the Host Network and saving IP addresses, also giving flexibility with the guest network setup. 3. Configure LAN Eth1 port to 192.168.1.2 […]

Unable to get tty name: Bad file descriptor

You may receive an error as “Unable to get tty name: Bad file descriptor” while accessing a VPS from the host server. The problem occur when some files from /lib directory of the VPS goes missing. See example below: root@hostserver:/# vzctl enter VEID entered into CT VEID Unable to get […]

vzdump LVM snapshots kernel errors

On running daily lvm snapshot backups via vzdump on OpenVZ servers, I noticed the below Kernel errors in logwatch reports. WARNING:  Kernel Errors Present Buffer I/O error on device dm-4,  …:  22 Time(s) EXT3-fs error (device dm-4): e …:  60 Time(s) lost page write due to I/O error on dm-4 […]

Quota getstat syscall: Inappropriate ioctl for device

You may receive the error message while starting a VPS on OpenVZ server. vzquota : (error) Quota getstat syscall for id 101: Inappropriate ioctl for device vzquota init failed [3] This is a typical Quota error message on OpenVZ servers while starting a VPS. The message indicates that you need […]

Accessing data on xen lvm guest image

Accessing xen guest image is very easy if the image is not lvm partitioned. But the main problem arise when the image is of lvm format and normal mount command cannot be used. Here I will show both the way. The first is when ext filesystem is used, and the […]

vzquota : (error) Quota on syscall for xxx: Device or resource busy

You may receive the following error message while starting a VPS: root@server [~]# vzctl start VEID vzquota : (error) Quota on syscall for id xxx: Device or resource busy vzquota : (error) Possible reasons: vzquota : (error) – Container’s root is already mounted vzquota : (error) – there are opened […]