Preparing the Overcloud Image

Getting Started with Napatech Link-Virtualization™ Software

Platform

Napatech SmartNIC

Content Type

Getting Started

Getting Started Guide

Capture Software Version

Link-Virtualization™ Software 4.5

The provided script installs the RPM packages for the Napatech OVS/DPDK and configures the overcloud image.

About this task

This describes a series of actions to modify the overcloud image.

Before you begin

Do not perform this procedure on the director node. Use another server to build the image for overcloud deployment.

Procedure

Download the overcloud image.

wget https://images.rdoproject.org/centos8/victoria/rdo_trunk/current-tripleo/overcloud-full.tar

Unpack the file.

tar xf overcloud-full.tar

Install the required packages.

sudo dnf groupinstall -y "Development Tools" 
sudo dnf groupinstall -y "Virtualization Host"
sudo dnf install -y qemu-kvm qemu-img
sudo dnf install -y libguestfs-tools-c

Update the QEMU access rights.

vim /etc/libvirt/qemu.conf

Add the following lines to the file.

user = "root"
group = "root"

Start the libvirt service.

sudo systemctl enable libvirtd
sudo systemctl start libvirtd

Set the root password.

sudo virt-customize -a overcloud-full.qcow2 --root-password password:1234

An output example:

[   0.0] Examining the guest ...
[  12.9] Setting a random seed
[  12.9] Setting the machine ID in /etc/machine-id
[  12.9] Setting passwords
[  16.0] Finishing off

Run a VM with the overcloud image.

sudo /usr/libexec/qemu-kvm -m 4096 -drive \
file=overcloud-full.qcow2,if=virtio -net nic,model=virtio -net nic \
-net user,hostfwd=tcp::10035-:22 -kernel overcloud-full.vmlinuz \
-append "rw root=/dev/vda console=ttyS0" \
-initrd overcloud-full.initrd  -nographic

...
CentOS Stream 8
Kernel 4.18.0-373.el8.x86_64 on an x86_64

Activate the web console with: systemctl enable --now cockpit.socket

localhost login: root
Password:

Copy the provided package from the host to the VM.
For example:
```
scp root@<host>:/root/tripleo/overcloud_image/Napatech/overcloud_packages.tar.gz .
scp root@<host>:/root/tripleo/overcloud_image/Napatech/customize_overcloud.sh .
```
Run the customize_overcloud.sh script which installs required packages and configure the overcloud image.
```
./customize_overcloud.sh
```
Delete the customize_overcloud.sh script.
```
rm -rf /root/customize_overcloud.sh
```
Restart and log in to the VM.
```
shutdown -r now
```
Clean up the overcloud image after changes are made.
All the packages must be deleted to make disk memory available, and network data must be cleared to keep the image without any network configuration.
1. Delete all data in the /etc/resolv.conf file.
```
# Generated by NetworkManager
nameserver 8.8.8.8 # delete this line
nameserver 10.0.2.3 # delete this line
```
2. Flush the IP address of network interfaces. For example:
```
ip addr flush <network_interface>
```
  For example:
```
ip addr flush ens3
ip addr flush ens4
```
3. Delete the dnf repository files.
```
rm -rf /etc/yum.repos.d/*
```
Shutdown the VM.
```
poweroff
```