How to add CentOS 8 cloud / KVM image to OpenStack? How to run CentOS 8 instance / VM on OpenStack? The Openstack Glance service enables users to discover, register and retrieve virtual machine images. The default storage location for these images is / var / lib / glance / images / Its backend is a file. In this guide, we upload the CentOS 8 KVM cloud image to the Openstack Glance service.
For RHEL 8: How to add RHEL 8 qcow2 image to OpenStack Glance
Vagrant and Cloud images for CentOS 8 were released when CentOS Linux 8 (1911) was opened to the public. This version is derived from the Red Hat Enterprise Linux 8.1 source code. Both CentOS 8 and CentOS 8 Stream can obtain Cloud images from cloud.centos.org.
OpenStack Glance supports the following image formats:
- raw (Unstructured format)
- qcow2 (Qemu / KVM, support copy-on-write)
- iso (Archive format for discs; for example, CD)
- VCR (Hyper-V, common in virtual machine monitors of companies such as VMware, Xen, Microsoft, VirtualBox, etc.)
- vdi (Qemu / VirtualBox)
- vmdk (VMware)
- bare (Excluding metadata)
- Autumn / Amy / Ali (Amazon kernel, ramdisk or machine image)
- and many more.
Upload CentOS 8 Cloud Image to OpenStack Glance
Install wget to download the cloud image:
---
Debian
/
Ubuntu
---
$ sudo apt install -y wget
--- CentOS / Fedora ---
$ sudo yum -y install wget
$ sudo dnf -y install wget
Download the latest Cloud image from cloud.centos.org.
--- CentOS 8 Linux x86_64 ---
wget https://cloud.centos.org/centos/8/x86_64/images/CentOS-8-GenericCloud-8.1.1911-20200113.3.x86_64.qcow2
--- CentOS 8 Stream Linux x86_64 ---
wget https://cloud.centos.org/centos/8-stream/x86_64/images/CentOS-Stream-GenericCloud-8-20200113.0.x86_64.qcow2
Before uploading, you can use our guide as a reference to further customize qcow2 images.
How to customize Qcow2 / Raw Linux OS disk image with virt-customize
Then get the openstack environment.
source ~/.keystonerc
And upload CentOS 8 Cloud Images to OpenStack Glance.
--- CentOS 8 Linux x86_64 ---
$ openstack image create
--container-format bare
--disk-format qcow2
--file CentOS-8-GenericCloud-8.1.1911-20200113.3.x86_64.qcow2
CentOS-8
--- CentOS 8 Stream Linux x86_64 ---
$ openstack image create
--container-format bare
--disk-format qcow2
--file CentOS-Stream-GenericCloud-8-20200113.0.x86_64.qcow2
CentOS-8-Stream
If you do not have the OpenStack CLI, please check: How to install and configure the OpenStack Client on Linux
Confirm if the image is available in Glance:
$ openstack image list | grep CentOS-8
| adbe1f0c-665e-481a-b689-e32414339415 | CentOS-8 | active |
| 035221af-97e4-4801-b171-fc1b6fc2245d | CentOS-8-Stream | active |
You can also upload images using the Horizon web interface-navigate to Project> Calculation > image > Create image
Provide image name, description, browse and select image from source, select image visibility, and click “ Create image “Button.
After the picture is uploaded, the details will be in Pictures section.
You can now launch instances from the uploaded images. See the following example:
$ openstack server create
--image CentOS-8
--key-name jmutai
--flavor m1.small
--security-group 7fffea2a-b756-473a-a13a-219dd0f1913a
--network private
mycentos8
Confirm server creation:
$ openstack server list
+--------------------------------------+-------------------+---------+-----------------------------------+-----------+----------+
| ID | Name | Status | Networks | Image | Flavor |
+--------------------------------------+-------------------+---------+-----------------------------------+-----------+----------+
| 9e1e1b14-db2c-405e-9361-6b1b08c707b8 | mycentos8 | ACTIVE | private=10.10.1.138 | CentOS-8 | m1.small |
+--------------------------------------+-------------------+---------+-----------------------------------+-----------+----------+
Let’s test if we can SSH to the created server.
$
ssh [email protected]
Warning: Permanently added '10.10.1.138' (ECDSA) to the list of known hosts.
Enter passphrase for key '/home/jmutai/.ssh/id_rsa':
Activate the web console with: systemctl enable --now cockpit.socket
[[email protected] ~]$
cat /etc/os-release
NAME="CentOS Linux"
VERSION="8 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="8"
PLATFORM_ID="platform:el8"
PRETTY_NAME="
CentOS Linux 8 (Core)
"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:8"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"
CENTOS_MANTISBT_PROJECT="CentOS-8"
CENTOS_MANTISBT_PROJECT_VERSION="8"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="8"
[[email protected] ~]$
exit
logout
Connection to 10.10.1.138 closed.
We can confirm that we are logged in to the CentOS 8 instance by checking the / etc / os-release content.
More guides on CentOS and OpenStack:
How to manage CentOS 8 Linux with Cockpit Web Console
Enable automatic software update on CentOS 8 / RHEL 8
How to join CentOS 8 / RHEL 8 system to Active Directory (AD) domain
How to install CentOS 8 Linux-step by step screenshot
How to resize / expand Cinder in OpenStack
How to rename an instance / server in OpenStack
How to assign a floating IP address to an instance in OpenStack
How to create an OpenStack instance with a fixed / static IP address
How to create OpenStack projects, users and roles
