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Install KVM on CentOS 8.3


rev.dennis

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Here are my notes on setting up KVM on a fresh install of CentOS 8.3 on a VMWare ESX host

SETTINGS

  • Ram: 8G
  • Disk: 50G

USER SETTINGS

  • root / SUPERMAN!

NETWORK SETTINGS (2 interfaces required)

  • IPADDR="10.11.24.20"
  • PREFIX="23"
  • GATEWAY="10.11.24.1"
  • DNS1="10.11.26.11"
  • DNS2="10.11.27.11"
  • DOMAIN="atic.eventguyz.com eventguyz.com"

 

As you go through the install choose:

Server with GUI

  • Container Management
  • Development Tools
  • Graphical Administration Tools
  • Headless Management
  • System Tools

1. Start with a clean install of CentOS 8.3
2. Add proxy to /etc/yum.conf and /etc/dnf/dnf.conf
3. CPU Support for Intel VT or AMD-V: cat /proc/cpuinfo | egrep "vmx|svm" OR RUN lscpu | grep Virtualization
4. sudo yum update
CHECK if its installed and running: sudo systemctl status libvirtd
5. sudo yum install @virt
6. VERIFY KERNEL MODS ARE LOADED: lsmod | grep kvm
7. TOOLS FOR MGMT: sudo dnf -y install virt-top libguestfs-tools
8. START KVM DAEMON: sudo systemctl enable --now libvirtd
9. INSTALL VIRT-MGR: sudo yum -y install virt-manager
10. CREATE NETWORK BRIDGE: sudo nmcli connection show

CREATE BRIDGE ON 2nd INTERFACE
nmcli connection show
nmcli connection delete e4014630-448b-5ad3-4992-f4678202147c
nmcli connection add type bridge autoconnect yes con-name br0 ifname br0
nmcli connection modify br0 ipv4.addresses 10.6.0.136/27 ipv4.method manual
nmcli connection modify br0 ipv4.gateway 10.6.0.129
nmcli connection modify br0 ipv4.dns 10.11.26.11 +ipv4.dns 10.11.27.11
nmcli connection delete ens224
nmcli connection add type bridge-slave autoconnect yes con-name ens224 ifname ens224 master br0
nmcli connection show
nmcli connection up br0
nmcli connection show br0
ip addr

VERIFY KVM INSTALLED
lsmod | grep kvm

HELPFUL TOOLS
dnf -y install virt-top libguestfs-tools

START/ENABLE KVM
systemctl enable --now libvirtd

MANAGE KVM VIRTUALS IN GUI
yum -y install virt-manager

dnf install virt-install virt-viewer libguestfs-tools
systemctl enable libvirtd.service
systemctl start libvirtd.service
systemctl status libvirtd.service

ip r

BEFORE
STP=yes
BRIDGING_OPTS=priority=32768
TYPE=Bridge
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=br0
UUID=b5a9dc97-ebd9-43aa-ba1f-88b308663a02
DEVICE=br0
ONBOOT=yes
IPADDR=10.6.0.136
PREFIX=27
GATEWAY=10.6.0.129
DNS1=10.11.26.11
DNS2=10.11.27.11

AFTER
STP=no
BRIDGING_OPTS=priority=32768
TYPE=Bridge
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=br0
UUID=b5a9dc97-ebd9-43aa-ba1f-88b308663a02
DEVICE=br0
ONBOOT=yes
IPADDR=10.6.0.136
PREFIX=27
GATEWAY=10.6.0.129
DNS1=10.11.26.11
DNS2=10.11.27.11
IPV6_DISABLED=yes 

systemctl restart NetworkManager.service

VERIFY
nmcli device

SET PROXY
vi /etc/wgetrc
use_proxy=yes
https_proxy = http://10.47.196.156:80
http_proxy = http://10.47.196.156:80
ftp_proxy = http://10.47.196.156:80

CREATE TEST INSTANCE
cd /var/lib/libvirt/boot/
wget --no-check-certificate https://mirrors.edge.kernel.org/centos/8/isos/x86_64/CentOS-8.3.2011-x86_64-boot.iso
wget https://mirrors.edge.kernel.org/centos/8/isos/x86_64/CHECKSUM
sha256sum --ignore-missing -c CHECKSUM

virt-install \
--virt-type=kvm \
--name centos8-vm \
--memory 1024 \
--vcpus=1 \
--os-variant=rhel8.1 \
--cdrom=/var/lib/libvirt/boot/CentOS-8.3.2011-x86_64-boot.iso \
--network=bridge=br0,model=virtio \
--graphics vnc \
--disk path=/var/lib/libvirt/images/centos8.qcow2,size=20,bus=virtio,format=qcow2

virsh dumpxml rhel8-server | grep vnc

You need to use an SSH client to setup tunnel and a VNC client to access the remote vnc VM display. Type the following SSH port forwarding command from your client/desktop:
ssh root@10.6.0.136 -L 5906:127.0.0.1:5906

List images
virt-builder --list
virt-builder --list | egrep -i 'debian|ubuntu'
virt-builder --list | egerp -i centos

virt-install \
--name fed29 \
--ram 1024 \
--vcpus 1 \
--disk path=/var/lib/libvirt/images/fed29.img,size=20 \
--os-variant fedora29 \
--os-type linux \
--network bridge=br0 \
--graphics none \
--console pty,target_type=serial \
--location 'http://fedora.inode.at/releases/29/Server/x86_64/os/' \
--extra-args 'console=ttyS0,115200n8 serial'

virt-install \
--name ubu-vm-01 \ 
--vcpus 2 \
--memory 2048 \
--disk size=8,bus=virtio,format=qcow2 \
--boot kernel=/var/lib/libvirt/images/kernel.ubuntu,initrd=/var/lib/libvirt/images/initrd.ubuntu \
--network bridge=br0 \
--graphics none \
--console pty,target_type=sclp \
--cdrom /var/lib/libvirt/images/ubuntu-17.10-server-s390x.iso

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