CentOS 8.x Cloudstack 4.15 Setup KVM host

To setup Cloudstack 4.15 KVM host use following steps:

Initialize server using CentOS 8.x Cloudstack 4.15 Initialize infrastructure server
Create bridge interface cloudbr0, cloudbr1, etc. based on interfaces to be used for cloud setup.
Refer: CentOS 8.x Creating bridge interfaces (br0) for virtual hosts to use shared interface

Best option is to create two bridges cloudbr0 and cloudbr1. Keep management and storage untagged on cloudbr0 via access VLAN. Keep public and guest on cloudbr1 via tagged VLANs. cloudbr0 network NIC can be access VLAN for management/storage. cloudbr1 should be trunk port for all other VLANs.
In case of bridges you can consider adding following additional configuration:
HOTPLUG=no

DELAY=0

STP=no

Install virt packages

dnf -y module install virt
dnf -y install virt-install virt-viewer

Change below parameters in '/etc/libvirt/libvirtd.conf' file

listen_tls = 0
listen_tcp = 1
tcp_port = "16509"
auth_tcp = "none"

Update '/etc/sysconfig/libvirtd' as follows:

#LIBVIRTD_ARGS="--timeout 120"
LIBVIRTD_ARGS="--listen"

Run below command for enable --listen for libvirtd service so that it works in traditional mode instead of systemd socket activation mode (Refer '<tt<man libvirtd')
```
systemctl mask libvirtd.socket libvirtd-ro.socket libvirtd-admin.socket libvirtd-tls.socket libvirtd-tcp.socket
```

Start and enable the libvirtd service

systemctl daemon-reload
systemctl start libvirtd
systemctl enable libvirtd
systemctl status libvirtd

Configure cloudstack repository by creating '/etc/yum.repos.d/cloudstack.repo'

[cloudstack]
name=cloudstack
baseurl=http://download.cloudstack.org/centos/$releasever/4.15/
enabled=1
gpgcheck=0

Install cloudstack-management package:
```
dnf -y install cloudstack-agent
```
Mount primary storage on appropriate location on all hosts eg /mnt/primary (Except in case of NFS)
Enable CloudStack agent
```
systemctl enable cloudstack-agent.service
```
Note that service would fail to start at this stage. It would get started while adding the KVM host to cloudstack

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