Category: Virtualization – Page 3

Vagrant

Posted on September 30, 2019 (September 13, 2020) by ServerOk

Vagrant allow you to quickly creare virtualmachines. You can download vagrant boxes from https://app.vagrantup.com/boxes/search Install Vagrant Install Vagrant on CentOS Install vagrant in Debian/Ubuntu

apt install vagrant -y

1	apt install vagrant -y

You may also need to install virtualbox

apt install virtualbox

1	apt install virtualbox

Using Vagrant Creating CentOS 8 Virtual Machine with Vagrant To update vagrant boxes, run

vagrant box update

1	vagrant box update

To list all available vagrant boxes

vagrant box list

1	vagrant box list

[…]

Proxmox 6 disable No valid subscription notice

Posted on September 8, 2019 by ServerOk

To disable No valid subscription notice from proxmox, edit file

vi /usr/share/javascript/proxmox-widget-toolkit/proxmoxlib.js

1	vi /usr/share/javascript/proxmox-widget-toolkit/proxmoxlib.js

Find

if (data.status !== 'Active') {

1	if (data.status !== 'Active') {

This is on line 380. inside function checked_command Replace with

if (false) {

1	if (false) {

Resart pveproxy

systemctl restart pveproxy

1	systemctl restart pveproxy

[…]

virt-manager

Posted on September 5, 2019 (September 5, 2019) by ServerOk

virt-manager is a GUI tool to manage virtual machines. On CentOS desktop, install it with

yum install virt-manager

1	yum install virt-manager

For installing on Ubuntu, see Install virt-manager on Ubuntu Connect to remote KVM server To connect to remote KVM server from virt-manager, Go to File > Add Connection If SSH port is not 22, use IP:PORT format to connect […]

Install virt-manager on Ubuntu

Posted on September 5, 2019 by ServerOk

virt-manager is a GUI tool used to manage KVM virtial machines. To install virt-manager on Ubuntu, run

apt install virt-manager

1	apt install virt-manager

[…]

Clone VM on VMware ESXi using vmkfstools

Posted on September 4, 2019 (September 4, 2019) by ServerOk

Free version of VMware ESXi don’t provide option to clone virtual machine. If you want to clone a VM, you need to purchase expensive vSphere license. There is a work around for this, you need to clone disk of an existing Virtual machine using vmkfstools. To make clone of a VM disk, SSH into your […]

virsh list

Posted on August 31, 2019 by ServerOk

To list all VM on a KVM server, run

virsh list

1	virsh list

Example

root@s3-m12:~# virsh list
 Id    Name                           State
----------------------------------------------------
 6     foo                            running

root@s3-m12:~#

root@s3-m12:~# virsh list

Id Name State

----------------------------------------------------

6 foo running

root@s3-m12:~#

See virsh […]

virsh nodeinfo

Posted on August 31, 2019 by ServerOk

To see information about a KVM node, run

virsh nodeinfo

1	virsh nodeinfo

Example

root@s3-m12:~# virsh nodeinfo
CPU model:           x86_64
CPU(s):              8
CPU frequency:       1861 MHz
CPU socket(s):       1
Core(s) per socket:  4
Thread(s) per core:  2
NUMA cell(s):        1
Memory size:         16423092 KiB

root@s3-m12:~#

root@s3-m12:~# virsh nodeinfo

CPU model: x86_64

CPU(s): 8

CPU frequency: 1861 MHz

CPU socket(s): 1

Core(s) per socket: 4

Thread(s) per core: 2

NUMA cell(s): 1

Memory size: 16423092 KiB

root@s3-m12:~#

See virsh […]

virsh

Posted on August 31, 2019 (August 31, 2019) by ServerOk

virsh command is used to manage KVM vps. It is part of libvirt package. http://libvirt.org virsh list virsh nodeinfo To list KVM virtual machines, run

virsh list

1	virsh list

Start a VM

virsh start VM_ID

1	virsh start VM_ID

To shutdown a VM, run

virsh shutdown VM_ID

1	virsh shutdown VM_ID

To delete a VM, run

virsh shutdown VM_ID

1	virsh shutdown VM_ID

Connect to Remote Server

virsh --connect qemu+ssh://root@server70.hosthat.com/system

1	virsh --connect qemu+ssh://[email protected]/system

This will take your SSH key. List All […]

LXD container snapshot and restore

Posted on August 31, 2019 by ServerOk

lxc allow you to take snapshot, restore snapshot of a container. Here we create a snapshot, then delete the /etc folder from the container. Now the container is useless. Restore the container from snapshot to get it work again.

root@UNUSED:~# lxc snapshot my-vm-2 my-vm-2-snap1
root@UNUSED:~# lxc exec my-vm-2 -- rm -rf /etc
root@UNUSED:~# lxc exec my-vm-2 -- bash
I have no name!@my-vm-2:~# ls -l / | grep etc
I have no name!@my-vm-2:~# exit
root@UNUSED:~# lxc restore my-vm-2 my-vm-2-snap1
root@UNUSED:~# lxc exec my-vm-2 -- bash
root@my-vm-2:~# ls -l / | grep etc
drwxr-xr-x  89 root   root    4096 Aug 27 07:06 etc
root@my-vm-2:~# exit
root@UNUSED:~#

root@UNUSED:~# lxc snapshot my-vm-2 my-vm-2-snap1

root@UNUSED:~# lxc exec my-vm-2 -- rm -rf /etc

root@UNUSED:~# lxc exec my-vm-2 -- bash

I have no name!@my-vm-2:~# ls -l / | grep etc

I have no name!@my-vm-2:~# exit

root@UNUSED:~# lxc restore my-vm-2 my-vm-2-snap1

root@UNUSED:~# lxc exec my-vm-2 -- bash

root@my-vm-2:~# ls -l / | grep etc

drwxr-xr-x 89 root root 4096 Aug 27 07:06 etc

root@my-vm-2:~# exit

root@UNUSED:~#

[…]

Install LXD on Ubuntu

Posted on August 30, 2019 (January 18, 2021) by ServerOk

LXD container snapshot and restore How do I copy a file from host into a LXD container? LXD is tool to manage LXC (Linux Containers). lxd allow you to create and manage light weight linux containers, it is like docker, but more like an actual virtual machine. LXD is more user friendly than using LXC […]