Tag: kvm

Set Static IP in RHEL 8 OVH VPS

On OVH VPS running AlmaLinux 8, IPv4 IP address gets dropped. I have to connect to the server using KVM feature available in OVH control panel.

I checked IP of the server with the command

ip a

It did hot show any IPv4 IP address. I checked the network configuration file

vi /etc/sysconfig/network-scripts/ifcfg-eth0

That had the following content

BOOTPROTO=dhcp
DEFROUTE=yes
DEVICE=eth0
DHCLIENT_SET_DEFAULT_ROUTE=yes
HWADDR=fa:16:3e:6b:a6:1a
IPV6ADDR=2607:5300:201:3100::952/56
IPV6INIT=yes
IPV6_AUTOCONF=no
IPV6_DEFAULTGW=2607:5300:201:3100::1
IPV6_FORCE_ACCEPT_RA=no
MTU=1500
ONBOOT=yes
TYPE=Ethernet
USERCTL=no

To make the IP static, I made the following changes.

Find

BOOTPROTO=dhcp

Replace with

BOOTPROTO=static

Also added following 2 entry

IPADDR=144.217.13.76
GATEWAY=144.217.12.1

144.217.13.76 is the IP address of the VPS.

144.217.12.1 is the gateway used on the VPS, found using “ip route” or “route -n” command.

[root@vps-eb960963 network-scripts]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         144.217.12.1    0.0.0.0         UG    0      0        0 eth0
144.217.12.1    0.0.0.0         255.255.255.255 UH    0      0        0 eth0
[root@vps-eb960963 network-scripts]#

Create a static route file

vi /etc/sysconfig/network-scripts/route-eth0

Add

144.217.12.1 dev eth0
default via 144.217.12.1 dev eth0

Here 144.217.12.1 is the gateway IP address found in the above step.

See IP

October 22, 2021

libvirt qemu unexpectedly closed the monitor Failed to create chardev
On CentOS 7 server, after installing KVM, i connected to server using Virt Manager. During VM creation, i get following error

libvirt.libvirtError: internal error: qemu unexpectedly closed the monitor: 2021-02-01T18:09:38.214356Z qemu-kvm: -chardev pty,id=charserial0: Failed to create chardev

To fix this, edit file
```
vi /etc/fstab
```
Find
```
devpts          /dev/pts        devpts  defaults	    	0       0
```
Replace with
```
devpts          /dev/pts        devpts  gid=5,mode=620	0       0
```
Reboot the server. After reboot, VM creation will work properly.

See KVM
February 1, 2021
Install Linux KVM on CentOS 7
Install kvm with
```
yum install -y qemu-kvm
```
Install libvirt, this is used to manage KVM virtual machines.
```
yum install -y libvirt-daemon-kvm libvirt-client
```
Enable libvirtd to start on boot
```
systemctl enable libvirtd
```
Start libvirtd
```
systemctl start libvirtd
```
To see status, run
```
systemctl status libvirtd
```
Install virt-install
```
yum install virt-install
```
Now you have Linux KVM installed. You can use virt-install or Virt Manager to create virtual machine.

When i create a Virtual Machine on CentOS 7, i get error reated to Failed to create chardev. If you get this error, click here for solution.

See KVM
February 1, 2021
Auto Start KVM Virtual Machine
To auto start a KVM Virtual Machine on boot time, use command
```
virsh autostart VMNAME_HERE
```
To disable a VM from auto starting, run
```
virsh autostart VMNAME_HERE --disable
```
See KVM
December 15, 2020

KVM VNC Allow Remote Access

By default VNC Console on a KVM virtual Machine only listens to localhost. So you need to do SSH tunnel to access VNC console.

To make VNC available on all interfaces on Host machine, you need to edit file

vi  /etc/libvirt/qemu.conf

You need to uncomment the line vnc_listen = “0.0.0.0”.

# VNC is configured to listen on 127.0.0.1 by default.
# To make it listen on all public interfaces, uncomment
# this next option.
#
# NB, strong recommendation to enable TLS + x509 certificate
# verification when allowing public access
#
vnc_listen = "0.0.0.0"

Once this is done, you need to shutdown and start the virtual machine. Just reboot won’t work.

root@PAR-199235:~# virsh vncdisplay kali-linux
127.0.0.1:0

root@PAR-199235:~# virsh shutdown kali-linux
Domain kali-linux is being shutdown

root@PAR-199235:~# virsh list --all
 Id   Name         State
-----------------------------
 -    kali-linux   shut off

root@PAR-199235:~# virsh start  kali-linux
Domain kali-linux started

root@PAR-199235:~# virsh vncdisplay kali-linux
:0

root@PAR-199235:~#

See Linux KVM

August 5, 2020

Configure KVM Bridge Network on Debian 10

Before you configure bridge network, make sure you have bridge-utils installed.

apt install bridge-utils

You may also need ifdown and resolvconf packages installed

apt install ifupdown resolvconf

Here is the default /etc/network/interfaces i had on the server

root@PAR-199235:~# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto enp1s0f0
allow-hotplug enp1s0f0
iface enp1s0f0 inet static
	address 163.172.107.119
	broadcast 163.172.107.255
	netmask 255.255.255.0
	gateway 163.172.107.1
	dns-nameservers 8.8.8.8

root@PAR-199235:~#

enp1s0f0 is name of the network interface card on the server.

To convert it to brudge configuration. You need to replace enp1s0f0 with br0.

Then add following to the file

    bridge_ports enp1s0f0
    bridge_stp off
    bridge_maxwait 5

Remember to replace enp1s0f0 with your actual network card interface name.

Also remove the line

allow-hotplug enp1s0f0

Here is the final /etc/network/interface file i have.

root@PAR-199235:~# cat /etc/network/interface
cat: /etc/network/interface: No such file or directory
root@PAR-199235:~# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface

auto br0
iface br0 inet static
	address 163.172.107.119
	broadcast 163.172.107.255
	netmask 255.255.255.0
	gateway 163.172.107.1
    bridge_ports enp1s0f0
    bridge_stp off
    bridge_maxwait 5
	dns-nameservers 8.8.8.8

root@PAR-199235:~#

August 4, 2020

Install Linux KVM on CentOS 8
To install Linux KVM hypervisor on CentOS 8, run
```
dnf install qemu-kvm
```
Install libvirtd
```
dnf install libvirt-daemon libvirt-daemon-kvm libvirt-client
```
Enable libvirtd to start on boot
```
systemctl enable libvirtd
```
Start libvirtd
```
systemctl start libvirtd
```
To see status, run
```
systemctl status libvirtd
```
Install virt-install
```
dnf install virt-install
```
Now you have Linux KVM installed. You can use virt-install or Virt Manager to create virtual machine.

See Linux KVM Virtualization
July 25, 2020
Install kvm on Debian 10
To install kvm on Debian 10, run
```
apt install -y qemu-kvm
```
Install libvirt, it is a tool to manage kvm
```
apt install libvirt-clients libvirt-daemon libvirt-daemon-system
```
Set libvirtd to start on boot
```
systemctl enable libvirtd
```
Restart libvirtd
```
systemctl restart libvirtd
```
You can see libvirtd status with
```
systemctl status libvirtd
```
Install virtinst, it is used to create virtual machine.
```
apt install virtinst
```
To see network, run
```
virsh net-list --all
```
Start the “default” network
```
virsh net-start default
```
Set default network to auto start on boot
```
virsh net-autostart default
```
Now you have kvm and libvirtd installed. You can create virtual machine using virtinst or Virt Manager

See KVM
July 25, 2020
Install virt-manager on Ubuntu
virt-manager is a GUI tool used to manage KVM virtial machines. To install virt-manager on Ubuntu, run
```
apt install virt-manager
```
September 5, 2019

virsh list

To list all VM on a KVM server, run

virsh list

Example

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

root@s3-m12:~#

To view all Virtual machines including stopped VM’s, use –all option.

root@mail:~# virsh list --all
 Id   Name       State
---------------------------
 1    iredmail   running
 -    win10      shut off

root@mail:~#

To see all network

root@server1:~# virsh net-list --all
 Name      State    Autostart   Persistent
--------------------------------------------
 Bridge0   active   yes         yes

root@server1:~#

See virsh

August 31, 2019

proxmox
Proxmox is a Virtualization software that allows you to run KVM virtual machines and LXC containers.

Once installed, you will be able to access proxmox on port 8006.
```
https://YOUR_SERVER_IP:8006
```
Some commands
```
pvecm nodes
pvecm status
systemctl status pve-cluster
systemctl status pvestatd
systemctl status pvedaemon
```
General
KVM
- Add ISO Images to Proxmox
- Proxmox Manage Virtual Machines with qm command
Containers (LXC)
December 28, 2017

Tag: kvm

General

KVM

Containers (LXC)