Installer prerequisitic file

installer_pre.sh

#!/bin/sh

set -x

# Check if virtualization is supported
ls /dev/kvm 2> /dev/null
if [ $? -ne 0 ]
then
    echo "Your system doesn't support virtualization"
    exit 1
fi

# Install required dependecies
sudo yum install -y libvirt libvirt-devel libvirt-daemon-kvm qemu-kvm

# Enable IP forwarding
sudo sysctl net.ipv4.ip_forward=1

# Configure libvirt to accept TCP connections
sudo sed -i.bak -e 's/^[#]*\s*listen_tls.*/listen_tls = 0/' -e 's/^[#]*\s*listen_tcp.*/listen_tcp = 1/' -e 's/^[#]*\s*auth_tcp.*/auth_tcp = "none"/' -e 's/^[#]*\s*tcp_port.*/tcp_port = "16509"/' /etc/libvirt/libvirtd.conf

# Configure the service runner to pass --listen to libvirtd
sudo sed -i.bak -e 's/^[#]*\s*LIBVIRTD_ARGS.*/LIBVIRTD_ARGS="--listen"/' /etc/sysconfig/libvirtd

# Restart the libvirtd service
sudo systemctl restart libvirtd

# Get active Firewall zone option
systemctl status firewalld
if [ $? -ne 0 ]
then
    echo "Your system doesn't have firewalld service running"
    exit 1
fi

activeZone=$(firewall-cmd --get-active-zones | head -n 1)
sudo firewall-cmd --zone=$activeZone --add-source=192.168.126.0/24
sudo firewall-cmd --zone=$activeZone --add-port=16509/tcp

# Configure default libvirt storage pool
sudo virsh --connect qemu:///system pool-list | grep -q 'default'
if [ $? -ne 0 ]
then
    sudo virsh pool-define /dev/stdin <<EOF
<pool type='dir'>
  <name>default</name>
  <target>
    <path>/var/lib/libvirt/images</path>
  </target>
</pool>
EOF
sudo virsh pool-start default
sudo virsh pool-autostart default
fi

# Set up NetworkManager DNS overlay
grep -q 'dns=dnsmasq' /etc/NetworkManager/NetworkManager.conf
if [ $? -ne 0 ]
then
    sudo sed -i.bak '/\[main\]/a dns=dnsmasq' /etc/NetworkManager/NetworkManager.conf
    echo server=/tt.testing/192.168.126.1 | sudo tee /etc/NetworkManager/dnsmasq.d/openshift.conf
    sudo systemctl restart NetworkManager
fi